US20010002500A1 - Upright water extraction cleaning machine - Google Patents
Upright water extraction cleaning machine Download PDFInfo
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- US20010002500A1 US20010002500A1 US09/753,368 US75336801A US2001002500A1 US 20010002500 A1 US20010002500 A1 US 20010002500A1 US 75336801 A US75336801 A US 75336801A US 2001002500 A1 US2001002500 A1 US 2001002500A1
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- recovery tank
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L5/00—Structural features of suction cleaners
- A47L5/12—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum
- A47L5/22—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum with rotary fans
- A47L5/28—Suction cleaners with handles and nozzles fixed on the casings, e.g. wheeled suction cleaners with steering handle
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- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
- A47L11/02—Floor surfacing or polishing machines
- A47L11/03—Floor surfacing or polishing machines characterised by having provisions for supplying cleaning or polishing agents
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- A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
- A47L11/29—Floor-scrubbing machines characterised by means for taking-up dirty liquid
- A47L11/30—Floor-scrubbing machines characterised by means for taking-up dirty liquid by suction
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- A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
- A47L11/29—Floor-scrubbing machines characterised by means for taking-up dirty liquid
- A47L11/30—Floor-scrubbing machines characterised by means for taking-up dirty liquid by suction
- A47L11/302—Floor-scrubbing machines characterised by means for taking-up dirty liquid by suction having rotary tools
- A47L11/305—Floor-scrubbing machines characterised by means for taking-up dirty liquid by suction having rotary tools the tools being disc brushes
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- A47L7/0009—Suction cleaners adapted to take up liquids, e.g. wet or dry vacuum cleaners with means mounted on the nozzle; nozzles specially adapted for the recovery of liquid
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- A47L7/0023—Recovery tanks
- A47L7/0028—Security means, e.g. float valves or level switches for preventing overflow
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- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L7/00—Suction cleaners adapted for additional purposes; Tables with suction openings for cleaning purposes; Containers for cleaning articles by suction; Suction cleaners adapted to cleaning of brushes; Suction cleaners adapted to taking-up liquids
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- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
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- A—HUMAN NECESSITIES
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
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- A47L9/0018—Storing devices ; Supports, stands or holders integrated in or removably mounted upon the suction cleaner for storing parts of said suction cleaner
- A47L9/0036—Storing devices ; Supports, stands or holders integrated in or removably mounted upon the suction cleaner for storing parts of said suction cleaner specially adapted for holding the suction hose
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/40—Mixing liquids with liquids; Emulsifying
- B01F23/49—Mixing systems, i.e. flow charts or diagrams
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/105—Mixing heads, i.e. compact mixing units or modules, using mixing valves for feeding and mixing at least two components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
- B01F35/71805—Feed mechanisms characterised by the means for feeding the components to the mixer using valves, gates, orifices or openings
- B01F35/718051—Feed mechanisms characterised by the means for feeding the components to the mixer using valves, gates, orifices or openings being adjustable
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/80—Forming a predetermined ratio of the substances to be mixed
- B01F35/81—Forming mixtures with changing ratios or gradients
Definitions
- This invention relates to cleaning machines and, more particularly, to an upright water extraction cleaning machine.
- Water extraction cleaning machines have long been used for removing dirt from surfaces such as carpeting, upholstery, drapes, and the like.
- the known water extraction cleaning machines can be in the form of a canister-type unit as disclosed in U.S. Pat. No. 5,237,720 to Blase et al. or an upright unit as disclosed in U.S. Pat. No. 5,500,977 to McAllise et al. and U.S. Pat. No. 4,559,665 to Fitzwater.
- the current water extraction cleaners can be difficult to use and often have limited adaptability for a variety of cleaning conditions.
- none of the known water extraction cleaners can quickly and efficiently vary the mixture ratio of detergent and water.
- none of the known upright water extraction cleaners can automatically adjust the height of the roller-type agitation brush in response to changes on the surface being cleaned.
- Another problem inherent with the known water extraction cleaners is ease of use in filling and emptying the clean water tank and recovery tank.
- none of the known prior art water extraction cleaners can quickly and easily convert between on-the-floor cleaning and off-the-floor cleaning with an accessory hose and cleaning tool.
- a portable surface cleaning apparatus has a base for movement along a surface to be cleaned; an upright handle pivotally attached to a rearward portion of the base; a liquid dispensing nozzle associated with the base for applying liquid to the surface; first and second liquid holding tanks fluidly connected to the dispensing nozzle for supplying first and second liquids, respectively, and mixtures thereof to the dispensing nozzle; a fluid recovery tank; a suction nozzle mounted to the base; a working air conduit extending between the recovery tank and the suction nozzle; and a vacuum source in fluid communication with the recovery tank for generating a suction in the recovery tank, conduit and nozzle to thereby draw liquid from the surface and deposit the liquid in the recovery tank.
- An adjustable mixing valve can be fluidly connected between the liquid holding tanks and the dispensing nozzle for changing the mixing ratio of the first liquid with respect to the second liquid.
- the mixing valve has a hollow valve body with an internal mixing chamber, a first inlet opening extending through the valve body in fluid communication between the internal mixing chamber and a first liquid supply tank, a second inlet opening extending through the valve body in fluid communication between the internal mixing chamber and the second liquid supply tank, an outlet opening extending through the valve body in fluid communication between the internal mixing chamber and the dispensing nozzle, and a plunger mounted in the valve body for reciprocal movement therein and including an end portion extending through the valve body and a valve stem positioned relative to one of the first and second inlet openings.
- the valve stem has a shape to vary the flow rate of fluid through the one inlet opening as the plunger moves axially with respect to the valve body. With this arrangement, the mixing ratio of the first and second liquids can be adjusted.
- the valve stem has on an outer surface thereof a groove that tapers from an end portion of the valve stem.
- the valve stem is positioned in the one inlet opening and thereby reduces the flow of the one liquid when the valve stem is moved into the one inlet opening.
- a cam follower is preferably attached to an outer end of the shaft and a manually rotatable selector switch with a cam element is mounted on the valve body.
- the cam follower rides along the cam element upon rotation of the selector switch to axially move the plunger and thereby vary the mixing ratio of the first and second liquids in the mixing chamber.
- a portable surface cleaning apparatus has a base for movement along a surface to be cleaned, an upright handle pivotally attached to a rearward portion of the base, a fluid recovery tank having an inner fluid holding chamber, a first suction nozzle mounted to the base, a working air conduit extending between the inner chamber and the suction nozzle, and a vacuum source in fluid communication with the inner chamber for generating a suction in the recovery tank, conduit and nozzle to thereby draw liquid from a surface and deposit the liquid in the recovery tank.
- a hose opening is formed in the working air conduit and a cap is removably mounted in the hose opening.
- An accessory hose having a first end is adapted for mounting in the hose opening for fluid connection to the working air conduit and a second end adapted for connection to a cleaning tool with a second suction nozzle.
- the hose first end has a baffle wall adapted to block the flow from the first suction nozzle to the recovery tank when the hose first end is received in the hose opening.
- a retainer lip is formed on the base adjacent the hose opening.
- a resilient arm on the hose first end has retainer thereon for seating beneath the retainer lip in a snap-fit relationship to the base. With this arrangement, the hose first end can be retained.
- a pivot mount can be provided between the hose first end and the hose opening, such that the hose first end can be rotated into mounted position in the hose opening.
- a recovery tank adapted for attachment to the base of a portable surface cleaning apparatus comprises an upper wall, a lower wall and at least one side wall connected together to define an enclosed chamber.
- the upper wall has an enclosed channel defining a conduit and an opening extending from the conduit into the chamber.
- the conduit is in fluid communication between a suction nozzle and a vacuum source of the cleaning apparatus when the recovery tank is attached to the base to thereby draw liquid and debris from a surface and deposit the liquid and debris into the recovery tank.
- a baffle is attached to an inner surface of the upper wall adjacent the upper wall opening. The baffle extends into the inner chamber from the upper wall to thereby separate fluid and debris from the air during cleaning operations.
- a recovery tank is adapted for attachment to the base of a portable surface cleaning apparatus having a handle attached to the base and a suction nozzle adapted for fluid communication with the recovery tank and a vacuum source.
- the recovery tank comprises an upper wall, a lower wall and at least one side wall connected together to define an enclosed chamber for holding a predetermined level of recovered liquid from a surface being cleaned.
- a first opening is formed in one of the recovery tank walls above the predetermined level for fluid communication between the recovery tank and the suction nozzle.
- a second opening is formed in one of the walls of the recovery tank below the predetermined level for fluid communication between the recovery tank and the vacuum source.
- An exhaust stand pipe has a lower end attached to an inner surface of the recovery tank.
- the stand pipe lower end surrounds the second opening while an upper free end of the exhaust pipe extends above the predetermined level.
- An elongate float has a first end that is buoyant and a second end that is adapted to cover the upper free end of the stand pipe when liquid in the recovery tank reaches the predetermined level to thereby block the transfer of air and liquid from the recovery tank to the vacuum source.
- at least one guide wall extends from the lower wall adjacent the stand pipe and the first buoyant end of the float is located between the stand pipe and the guide wall for guiding movement of the float second end toward the stand pipe upper free end during liquid rise in the recovery tank.
- a brush assembly is pivotally connected to the base and includes an elongate member extending substantially parallel with, and in proximity to the suction nozzle.
- the elongate member has a plurality of bristles projecting outwardly therefrom to contact a surface to be cleaned.
- the brush assembly further includes at least one pivot arm with a first end mounted to the elongate member and a second end pivotally mounted to the base such that the height of the bristles can be varied to automatically adjust for different surface heights.
- a catch projects from one of the pivot arm and the base and a stop member projects from the other of the pivot arm and the base toward the catch, the catch and stop member being mutually engageable to arrest downward travel of the elongate member beyond a predetermined limit when the bristles are disengaged from the surface.
- a brush assembly is pivotally connected to the base and includes an elongate, substantially cylindrical member extending substantially parallel with, and in proximity to the suction nozzle. At least one pivot arm has a first end mounted to the elongate member for rotation of the elongate member with respect to the pivot arm and a second end pivotally mounted to the base, such that the brush assembly is free floating to automatically adjust to different surface heights.
- a motor is mounted to the base and a transmission member is connected between a shaft of the motor and the elongate member for rotating the elongate member when the motor is actuated.
- the at least one pivot arm comprises a side wall with a bearing surface mounting the elongate member for rotation about a longitudinal axis and a bottom wall integrally formed with the side wall.
- the bottom wall is in vertical alignment with the transmission member to thereby cover at least a lower portion of the transmission member.
- an improved upright water extraction cleaning machine comprises a base adapted for movement across a supporting surface, a handle pivotally mounted to the base, a fluid pump having a fluid inlet connected to at least one liquid holding tank and a fluid outlet connected to at least one spray nozzle to thereby transfer liquid from the at least one holding tank to the at least one spray nozzle under pressure and distribute the liquid onto the supporting surface, a suction nozzle mounted to the base to remove liquid and debris from the surface, and a vacuum source mounted to one of the base and the handle and connected to the suction nozzle to generate a working air flow for recovering the liquid and debris.
- a priming valve having a valve body with an interior chamber includes a valve inlet port connected to the pump outlet and a valve outlet port connected to the vacuum source.
- a plug is located within the interior chamber and is movable between a priming position wherein the plug is spaced from the valve outlet such that liquid can be drawn into the interior of the hollow body when the vacuum source is operating, and a sealing position wherein the plug seats against the valve outlet port to block liquid from entering the vacuum source.
- the weight and dimension of the plug is chosen such that the combined presence of negative air pressure on the plug and movement of liquid in the interior chamber toward the valve outlet is sufficient to move the plug toward the valve outlet.
- FIG. 1 is a front, perspective view of an upright water extraction cleaning machine according to the invention
- FIG. 2 is a rear, perspective view of the upright water extraction cleaning machine of FIG. 1;
- FIG. 3 is a partial, side-elevational view showing a pivot mounting and locking arrangement of the upper housing to the base according to a first embodiment
- FIG. 3A is an enlarged side-elevational view shown in area A of FIG. 3 with the upper housing tilted with respect to the base;
- FIG. 3B is a view similar to FIG. 3 showing a pivot mounting and locking arrangement according to a second embodiment
- FIG. 4 is a schematic view showing the cleaning fluid distribution system of the cleaning machine of FIG. 1;
- FIG. 5 is a partial, sectional, exploded view of the tank assembly and handle
- FIG. 6 is a partial, sectional, exploded view of the tank one-way valve and tank seat assembly
- FIG. 7 is a partial sectional view of the variable fluid mixing valve mechanism shown in a first position
- FIG. 8 is a partial sectional view of the variable fluid mixing valve of FIG. 7 shown in a second position
- FIG. 9 is a partial, sectional view of the foot member and recovery tank taken along lines 9 - 9 of FIG. 1;
- FIG. 10 is an exploded view of the recovery tank assembly
- FIG. 11 is a front perspective view of the upright water extraction cleaning machine of FIG. 1 showing the accessory hose mounted in the operative position;
- FIG. 12 is a partial, sectional view showing the mounting of the accessory hose to the recovery tank
- FIG. 13 is a partial, exploded view of the agitation brush assembly and foot member.
- FIG. 14 is a perspective view of an alternative embodiment of the agitation brush of FIG. 13.
- an upright water extraction cleaning machine 12 which comprises a base assembly 14 , an upper housing 16 pivotally mounted to the base assembly 14 , a handle 18 extending upwardly from the upper housing 16 , and a tank assembly 20 mounted to and supported by both the handle 18 and upper housing 16 .
- the base assembly 14 comprises a foot or base member 24 , a pair of rear wheels 26 , 28 mounted to the rear of the foot member 24 , and a recovery tank 30 removably supported on the foot member 24 .
- a pair of over-center latches 32 are provided, one on each side of the foot member 24 , and are adapted to cooperate with a pair of projections 34 (FIG. 10), one provided on each side of the recovery tank sidewall for locking the recovery tank 30 to the foot member 24 .
- a handle 36 is pivotally mounted to the recovery tank 30 for carrying the tank.
- the tank assembly 20 comprises a clean water tank 42 and a detergent tank 44 which nests inside the front surface of the clean water tank 42 .
- a pair of over-center latches 46 are provided, one on each side of the sidewall of the upper housing 16 .
- the latches 46 are adapted to cooperate with a pair of projections 48 (FIG. 5), one of which is provided on each of the sidewalls of the clean water tank 42 , for locking the tank assembly 20 to the upper housing 16 and handle 18 .
- An accessory hose storage rack 50 is mounted to the rear surfaces of the handle 18 and upper housing 16 .
- the rack 50 includes an upper portion 51 and a lower portion 53 and is adapted to support and store an accessory hose 52 when the hose is not in use.
- An accessory hose mounting member 62 is mounted on one end of the hose 52 and is received in a C-shaped clip 66 provided on the upper end of the rack 50 .
- the flexible body of the hose 52 is wrapped around the upper and lower portions 51 , 53 of the storage rack 50 .
- a grip tube 64 is mounted on the other end of the hose 52 and is snapped into the C-shaped clip 66 integrally molded into the rack 50 .
- a double C-shaped clip 67 (FIG. 2) can be provided at one or more locations to clamp adjacent portions of the hose 52 together when the hose is stored on the machine. The double C-shaped clip 67 can be removed from the hose when the hose is unwrapped for use.
- the grip tube 64 of the accessory hose 52 is adapted to receive cleaning tools such as the upholstery tool 68 shown in FIGS. 1 and 2.
- cleaning tools such as the upholstery tool 68 shown in FIGS. 1 and 2.
- any number of a variety of cleaning tools can be received on the grip tube 64 such as a crevice spray tool as seen in U.S. patent application Ser. No. 08/574,769 which is expressly incorporated herein by reference or, alternatively, a window washing tool as seen in U.S. patent application Ser. No. 08/683,608 which is also expressly incorporated herein by reference.
- a closed loop grip 58 is provided at the terminal end of the handle 18 and a trigger 60 is pivotally mounted to the handle 18 inside the closed loop grip 58 . As described further below, the trigger 60 is used to control the distribution of cleaning solution from the base assembly 14 .
- a releasable latch 40 is mounted to the base assembly 14 and is adapted to retain the handle 18 and upper housing 16 in the upright, stored position as seen in FIGS. 1 and 2.
- the handle 18 can be tilted rearwardly by grasping the handle 18 and depressing the latch 40 relative to the base assembly 14 . With the latch 40 depressed, the handle is then tilted rearwardly with respect to the base assembly 14 .
- a three-position electrical switch 54 is mounted to the rear of the handle 18 .
- the three positions of the switch are as follows: (a) all systems off, (b) the “pre-treat” position in which both the cleaning solution pump and agitation brush are on but the vacuum motor is turned off, and (c) the “cleaning position” in which the vacuum motor, agitation brush, and cleaning solution pump are all on.
- An electrical cord 56 extends outwardly from the upper housing 16 and is electrically connected to the three-position switch 54 .
- a pair of opposed cord wraps 70 , 72 are provided on the upper and lower portions 51 , 53 of the storage rack 50 for containing the electrical cord 56 when the machine 12 is not in use.
- a large number of the operative components of the machine 12 are mounted to or provided inside the upper housing 16 and handle 18 .
- the tank assembly 20 is supported on the handle 18 and upper housing 16 .
- a vacuum motor 74 and impeller fan 76 are mounted in the round, bulbous lower portion of the upper housing 16 .
- the upper portion of the upper housing supports a large number of components of the water distribution system such as the solution pump mixing valve which will be described in greater detail, below.
- FIG. 3 shows the pivot mounting and locking assembly of the upper housing 16 to the base assembly 14 .
- the wheel 26 is shown in phantom lines to reveal the pivot mounting and locking assembly of these two elements.
- the pivot mounting itself is identical for both the right and left sides of the upper housing 16 , and therefore, only the left side will be described in detail.
- the foot or base member 24 includes an upwardly extending rear support member 80 with a semi-circular bearing surface 82 integrally formed therein.
- a substantially circular boss 84 extends outwardly from the sidewall 86 of the upper housing 16 and is adapted to be received in the bearing surface 82 .
- a retention member 88 having an integrally molded substantially semi-circular bearing surface 90 formed therein is adapted to be secured to the top surface of the support member 80 , thereby capturing the outwardly extending boss 84 of the upper housing 16 between the opposed semi-circular bearing surfaces 82 , 90 .
- the a projection 92 formed on the retention member 88 fits within a groove of the foot member 24 .
- the rear portion 89 of the retention member can be secured to the foot member 24 through a screw-type fastener 91 passing through the projection 92 and into the foot member 24 .
- a front portion 96 of the retention member 88 has a pair of tabs 102 (only one of which is shown) extending downwardly therefrom.
- a free end of each tab 102 includes a barb 104 that snaps within a corresponding groove (not shown) in the foot member 24 to secure the front portion 96 of the retention member 88 to the foot 24 .
- a locking assembly 105 is preferably located on the left side of the cleaning machine 12 , although it is to be understood that the locking mechanism can alternatively or in addition be arranged on the right side.
- the locking assembly 105 includes a foot engagement section 107 and a stem 109 formed integrally with the foot engagement section 107 .
- a pivot pin 101 extends through a tab 111 on the retention member 88 and the stem 109 to pivotally attach the foot engagement section 107 to the base member 24 .
- a flat spring 113 is integrally formed with the stem 109 with a free end 127 thereof abutting an upper surface of the retention member rear portion 89 . The spring 113 biases the foot engagement section 107 toward the front portion 96 .
- a locking extension 115 includes a flat locking surface 117 and a bearing surface 119 .
- the base member 24 includes a semi-cylindrical laterally extending protrusion 125 which is located on the side wall 86 with a flat locking surface 121 and a curved bearing surface 123 .
- the flat locking surfaces 117 , 121 abut each other or are in close proximity to each other. If a user attempts to rotate the handle 18 with respect to the foot member 24 , the locking surfaces 117 , 121 engage and prevent relative rotation of the handle and foot member.
- the foot engagement portion 107 is depressed, as shown in phantom line, the locking extension 115 rotates away from the protrusion 125 until the locking surfaces are no longer in facing relationship. In this position, the handle 18 can be rotated with respect to the base member 24 .
- the bearing surface 119 engages the bearing surface 123 to rotate the foot engagement portion 107 against the bias of spring 113 until the locking extension 115 is clear of the protrusion 125 and the locking surfaces 117 , 121 are again in facing relationship.
- the preferred embodiment of the cleaning machine 12 incorporates a rotatably mounted agitation brush which receives the force of rotation from a brush motor mounted to the foot member 24 .
- a rotatably mounted agitation brush which receives the force of rotation from a brush motor mounted to the foot member 24 .
- electrical current is supplied to the brush motor for rotating the agitation brush.
- an interrupt switch 98 is provided in the electrical circuit between the brush motor and the source of electricity.
- the switch 98 is mounted to the foot member 24 and adapted to cooperate with a projection 100 extending outwardly from the front, bottom surface of the upper housing 16 .
- the projection 100 bears against the switch 98 , thereby opening the electrical circuit between the source of electricity and the agitation brush. Therefore, the brush will not rotate, regardless of the position of the three-position switch 54 .
- the projection 100 Upon rearward titling movement of the handle 18 and upper housing 16 relative to the base assembly 14 , the projection 100 will pivot out of contact with the interrupt switch 98 mounted on the foot member 24 .
- the switch 98 will assume a closed position and complete the circuit between the source of electricity and the brush motor, assuming that the three-position electrical switch 54 is in any position other than off.
- the relative position of the switch and projection can be reversed so that the switch is mounted on the upper housing and selectively contacts a projection mounted on the foot member 24 .
- a spring and biased pin can be mounted to the upper housing or foot member 24 in order to provide additional travel for actuating the switch 98 .
- the switch is preferably mounted to the upper housing.
- the switch 98 can be replaced by an ON/OFF switch that is mounted at a convenient location on the cleaning machine 12 for actuation by a user.
- the water extraction cleaning machine can be used in a manner similar to an upright vacuum cleaning machine.
- the operator can grasp the closed loop grip 58 and manipulate the base assembly 14 forward and backward over the surface being cleaned.
- a pivot mounting and locking assembly 105 ′ according to a second embodiment is illustrated, wherein like parts in the previous embodiment are represented by like numerals.
- the assembly 105 ′ is preferably located on the left side of the cleaning machine 12 , although it is to be understood that the locking mechanism can alternatively or in addition be arranged on the right side.
- the locking assembly 105 ′ includes a foot engagement section 107 ′ and a stem 109 ′ formed integrally with the foot engagement section 107 ′.
- a pivot pin 101 extends through a tab 111 on the retention member 88 and the stem 109 ′ to pivotally attach the foot engagement section 107 ′ to the base member 24 .
- a flat spring 113 ′ is integrally formed with the stem 109 ′ with a free end 127 ′ thereof abutting an upper surface of the retention member rear portion 89 .
- the spring 113 ′ biases the foot engagement section 107 ′ toward the front portion 96 .
- a lever arm 115 ′ is integrally molded with, or otherwise rigidly attached to the stem 109 ′ and extends outwardly and downwardly therefrom.
- a pin 155 projects from the outer free end 157 of the lever arm 115 ′ and rides in a slot 159 of a locking plate 161 .
- the locking plate 161 is pivotally attached to the base member 24 through a pivot pin 163 and includes a hook-shaped locking portion 165 with an inner hook surface 169 .
- the base member 24 includes a cylindrical laterally extending protrusion 125 ′ which is located on the side wall 86 .
- the inner hook surface contacts an outer surface of the protrusion 125 ′ to prevent relative rotation of the handle and foot member.
- the pin 155 rides in the slot 159 of the locking plate 161 and forces the locking plate to pivot in a direction opposite to the pivoting direction of the foot engagement portion 107 ′.
- the hook-shaped locking portion 165 rotates away from the protrusion 125 ′ until it is clear of the protrusion.
- the handle 18 can be rotated with respect to the base member 24 .
- the locking plate then rotates to its original position under bias from the spring 113 ′.
- the inner surface 169 catches the protrusion 125 ′ and forces the plate (and foot engagement portion) to rotate against the bias of the spring 113 ′ until the protrusion 125 ′ is seated in the hook-shaped locking portion 165 .
- FIG. 4 is a schematic representation of the cleaning solution distribution system for the preferred embodiment of the cleaning machine.
- clean water and detergent are drawn from the respective tanks 42 , 44 to a mixing valve 110 through the operation of a pump 112 .
- the pump 112 then conducts the pressurized cleaning solution to spray nozzles 114 provided on the base assembly 14 or to the trigger valve 108 of the accessory hose 52 through an accessory hose solution tube mounting 116 provided on the front wall of the upper housing 16 and an accessory hose tube connector 106 mounted on the end of the hose 52 opposite the cleaning tool 68 .
- both the clean water tank 42 and the detergent tank 44 include one-way valve mechanisms 122 on the bottom surfaces thereof which cooperate with tank seat assemblies 150 provided on the upper surface of the upper housing 16 to control the flow of fluid from the tank to the other components of the distribution system.
- the structure of the one-way valves 122 and tank seat assemblies 150 is identical, and therefore, only the structure of the clean tank valve 122 and seat assembly 150 will be described in detail.
- the bottom wall of the clean tank 42 has a downwardly extending threaded boss 118 with an aperture extending therethrough.
- a threaded cap 120 is rotatably received on the boss 118 , and mounts a one-way valve member 122 enclosing the aperture of the boss.
- the valve member 122 comprises a hollow valve body 124 having a downwardly extending connector boss 126 with a fluid flow aperture 128 extending therethrough.
- a flexible rubber seal 130 fits around the boss 126 and is adapted to engage an inner surface 151 of the tank seat assembly 150 when the valve member is installed thereon.
- a gasket 132 , a release rod or plunger 138 and a compression spring 136 are located within the valve body 124 and held in position by a spring housing 134 .
- a lower end of the spring housing 134 can be securely attached to the inside of the hollow valve body through ultrasonic welding, adhesives, or other well known means.
- the spring housing 134 preferably has a plurality of apertures 144 to permit the flow of fluid from the tank therethrough.
- a screen 146 is attached to an upper end 148 of the spring housing 134 to filter out large particles of foreign material that may be present in the fluid.
- An outer shoulder 145 on the valve body receives an annular gasket 147 that seals around the lower edge of the boss 118 of each tank.
- the release rod 138 has an annular flange 140 that seats against the gasket 132 under a biasing force from the spring 136 to prevent the flow of fluid from the tank when it is separated from the tank seat assembly 150 .
- the bottom of the release rod 158 is flush with the bottom of the connector boss 126 , or slightly thereabove to prevent inadvertent valve opening when the tank is placed right side up on a surface.
- the tank seat assembly 150 comprises a seat member 152 having a substantially circular flange 154 extending upwardly and downwardly from a base plate 156 .
- a central projection 158 extends upwardly from the base plate 156 , and a plurality of fluid apertures 160 are formed in the base plate 156 intermediate the central projection 158 and the circular flange 154 .
- a reservoir 162 is mounted to the seat member 152 beneath the fluid apertures 160 , and a conventional hose mounting 164 extends outwardly from the reservoir 162 .
- a conventional hose 166 is mounted to the hose mounting 164 and fluidly connects the reservoir to the mixing valve 1 10 which is then fluidly connected to the pump 112 .
- the preferred embodiment of the seat assembly 150 also includes a one-way umbrella valve 167 to prevent the back flow of solution from the reservoir 162 past the base plate 156 , which may occur when the liquid level in one supply tank is higher than the liquid level in the other supply tank.
- the one-way valve comprises an elastomeric umbrella valve member 168 having a central stem 170 extending from one side thereof which is received in an appropriate aperture 172 of a support disc 174 .
- the disc 174 is supported in a suitable recess 176 provided in the seat member 152 .
- the disc 174 has a plurality of flow apertures 178 provided therein, all of which are adapted to be covered by the umbrella valve 168 .
- the tanks are received on the handle 18 and upper housing 16 by vertical movement of the tank assembly 20 with respect to the upper housing 16 .
- the one-way valves 122 of the tanks will be telescopically received inside the tank seat assemblies 150 so that the central projection 158 extends upwardly through the boss 126 of the one-way valve a sufficient distance to dislodge the rod 138 from the aperture 128 , thereby permitting the flow of fluid through the one-way valve and into the tank seat assembly 150 .
- the tank assembly 20 is configured for easy refilling of the tanks and securing the tanks to the upper housing 16 and handle 18 .
- the clean water tank 42 has an integrally molded carrying handle 184 and a cap 186 closing a fill opening aperture 188 formed on the top wall of the tank.
- a protrusion 187 is integrally molded with the bottom of the clean water tank and fits within a corresponding depression (not shown) in the upper housing 16 .
- the outer wall of the protrusion facilitates alignment of the tank assembly 20 with the upper housing 16 .
- the inner volume of the protrusion can be filled with detergent that will be mixed in a predetermined ratio when the tank 42 is subsequently filled with water, in the event that the detergent tank 44 and mixing valve are not used.
- the cap 186 can be quickly and easily removed for filling the tank 42 with clean water.
- the clean water is discharged through the boss 126 and one-way valve mechanism 122 provided on the bottom wall of the clean water tank 42 .
- a vent opening 182 extends through the upper wall of the tank 42 to allow entry of air when water is removed from the tank from the valve mechanism 122 . If the plunger 138 becomes stuck during operation, the vent opening 182 prevents siphoning if liquid should leak past the plunger.
- the detergent tank 44 nests into a recess 190 accessible through the front wall 192 of the clean water tank 42 .
- the recess 190 is formed in the front, bottom edge of the clean water tank and is defined by a pair of opposed sidewalls 194 , a rear wall 196 , and a top wall 198 .
- a pair of substantially horizontal projections 200 are provided on the sidewalls 194 of the recess 190 . These projections 200 are adapted to cooperate with a pair of substantially complimentary grooves 202 formed in the sidewalls 204 of the detergent tank 44 for mounting the tanks to one another.
- the detergent tank 44 is removed from the clean water tank 42 by sliding the detergent tank 44 forward, parallel to the axis of the projections 200 and grooves 202 , until the detergent tank 44 is removed from the recess 190 .
- the detergent tank 44 must be refilled by unscrewing the cap 120 of the one-way valve assembly and removing the valve member 122 to permit refilling of the tank 44 through the boss aperture.
- the detergent tank 44 has an umbrella valve 203 (FIG. 5) that fits within a venting aperture 205 on the tank 44 to prevent fluid leakage when the tank is inverted for refilling.
- the umbrella valve 203 is preferably similar in construction to the one-way umbrella valve 167 in FIG. 6.
- the tank assembly 20 is preferably slidably mounted to the handle 18 .
- the rear wall of the clean water tank 42 includes a U-shaped groove 210 which is substantially complementary to the front portion of the handle 18 .
- the groove 210 is defined by a pair of opposed sidewalls 212 and a front wall 214 .
- the sidewalls 212 include a pair of linear grooves 216 which are complementary to a pair of linear projections 218 formed on sidewalls 220 of the handle 18 .
- the handle projections 218 extend only a portion of the length of the handle 18 .
- the tank assembly 20 is slidably received on the handle 18 by positioning the tank assembly 20 vertically above the upper housing 16 so that the projections 218 and grooves 216 are aligned with one another. Then the tank assembly 20 is lowered so that the tank assembly 20 is slidably received on the handle 18 and the grooves 216 receive the projections 218 .
- the tank assembly 20 is fully received on the handle 18 when the one-way valve assemblies of the tanks 20 engage the seat assemblies 150 provided on the top wall of the upper housing 16 .
- the tank seat assemblies 150 are not rigidly mounted horizontally in order to allow alignment of the two tank outlets, which would otherwise cause leaks. Once the tank assembly is in this position, the latches 46 can then be pivoted onto the projections 48 for locking the tank assembly 20 to the handle 18 and upper housing 16 .
- the mixing valve 110 is positioned intermediate the tank seat assemblies 150 and the solution pump 112 .
- the mixing valve is a variable mixing valve 110 to accommodate differing mixtures of detergent and clean water.
- the variable mixing valve 110 comprises a valve body 230 having a clean water inlet 232 which is fluidly connected to the clean water tank seat assembly 150 by the hose 166 and a detergent inlet 236 which is fluidly connected to the detergent tank seat assembly 150 by a hose 238 .
- a solution outlet 240 is also formed on the valve body 230 and is adapted to conduct the clean water and detergent mixture from the mixing valve 110 to the pump 112 through a hose 242 .
- the valve body is formed from an end cap 244 , a central body portion 246 , and an end inlet member 248 mounted to the end of the central body portion 246 opposite the end cap 244 .
- a plunger 250 extends through an aperture in the end cap 244 such that a shaft 251 of the plunger 250 is received inside the central body portion 246 and the end inlet member 248 and a portion of the shaft extends outwardly from the end cap 244 .
- a cam follower 252 is formed at the outer end of the shaft 251 and is adapted to ride along a contoured cam surface 272 of a cam 270 , as seen in FIG. 7.
- a plunger head includes a collar 254 that is positioned along the length of the shaft of the plunger 250 and has an annular groove 256 formed therein that receives an O-ring 258 .
- the collar 254 and O-ring 258 are adapted to create a fluid seal inside the circular valve body and in cooperation with the central body portion define a mixing chamber 260 therein.
- An O-ring 262 is provided in the central body portion 246 immediately adjacent the end inlet member 248 . The O-ring 262 cooperates with the plunger 250 to effectively seal the end inlet member 248 and detergent inlet 236 from the mixing chamber 260 , depending upon the axial position of the plunger 250 within the valve body 230 .
- the plunger 250 forms a valve stem 263 at one end with a tapered groove 264 which extends along the surface of the plunger valve stem 250 , preferably passing through the end wall of the plunger 250 , and is tapered so that the groove 264 has a greater cross-sectional area immediately adjacent the end than it does a spaced distance therefrom.
- the valve stem 263 is positioned in the detergent inlet 236 opening to control the flow of detergent therethrough.
- the purpose of the tapered groove 264 is to accommodate varying flow rates of detergent through the opening in the detergent inlet 236 into the mixing chamber 260 of the valve body 230 .
- a control knob 266 is mounted on the front wall 268 of the upper housing 16 for controlling the water/detergent ratio in the cleaning solution delivered to the pump 112 .
- the cam 270 is mounted to the rear surface of the knob 266 , and the cam 270 is positioned so that the terminal end of the plunger 250 bears against the contoured surface 272 of the cam 270 .
- FIGS. 7 and 8 depict the two extreme ranges of solution mixtures in the preferred embodiment of the cleaning machine 12 .
- FIG. 7 shows the plunger 250 extended outwardly from the valve body 230 the maximum distance. In this position, the maximum length of the tapered groove 264 is extended into the mixing chamber 260 of the valve. Therefore, the maximum amount of detergent will be drawn into the mixing chamber 260 and ultimately discharged to the pump 112 .
- FIG. 8 depicts the other extreme position in which the plunger 250 is positioned so that the entire length of the tapered groove 264 is withdrawn from the mixing chamber 260 so that there is no fluid flow communication between the detergent inlet 236 and the mixing chamber 260 . Therefore, only clean water will be directed to the pump 112 .
- the contoured surface 272 of the cam 270 permits an infinite number of detergent to water mixing ratios between the two extremes shown in FIGS. 7 and 8.
- the knob 266 and cam 270 are received in only one of three positions, the water only or “rinse” position as seen in FIG. 8, a maximum detergent to water mixing ratio as seen in FIG.
- the knob 266 is intended to be positioned at the standard mixing ratio position for the vast majority of cleaning operations. When a high traffic or heavily stained area is encountered, the knob 266 can be rotated to the maximum detergent position as seen in FIG. 7. If a final clean water rinsing operation is desired, then the knob 266 can be rotated to the water only position as seen in FIG. 8.
- the incorporation of the variable mixing valve 110 permits varying the water/detergent mixture ratios to accommodate a wide variety of cleaning situations.
- the pump 112 is positioned downstream from the variable mixing valve 110 .
- the pump 112 When the pump 112 is energized and primed, the pump 112 will draw fluid from the mixing valve 110 and tank seat assemblies 150 at the prescribed ratio.
- the pump 112 preferably does not self-prime. Some means, therefore, should be incorporated to assist priming of the pump 112 .
- the fluid flow system in FIG. 4 includes a pump priming valve 280 which is preferably mounted vertically above the pump 112 , the tank seat assemblies 150 in the base of the handle 18 , and the water level in the tank 42 .
- the pump priming valve 280 includes an inlet port 282 that is fluidly connected to the outlet of the pump 112 and a fluid outlet port 284 that is fluidly connected to the impeller fan chamber of the vacuum motor 74 (FIG. 2), or a portion of the recovery tank that is exposed to vacuum pressure.
- the pump priming valve 280 comprises a hollow valve body having an inner chamber 286 .
- a small shoulder 292 with a central aperture 294 is formed inside the valve body.
- An elongate plunger 290 having a conical rubber sealing tip 296 is received for reciprocal movement inside the ball chamber.
- the priming valve 280 may also include a vent aperture (not shown) to prevent potential siphoning.
- the pump 112 will be primed with the fluid from the solution tanks by turning the pump 112 on and the vacuum motor 74 on.
- the vacuum motor 74 will exert negative pressure on the fluid outlet of the pump 112 through the pump priming valve 280 thereby drawing any air out of the pumping chamber (not shown) between the pump inlets and the solution tanks therethrough.
- the air will be drawn through the pump priming valve 280 into the vacuum impeller fan chamber or into the recovery tank 30 .
- the weight and dimensions of the plunger 290 is coordinated with the amount of negative air pressure applied to the pump priming system from the vacuum motor so that the negative air pressure applied to the fluid chamber 286 is insufficient, by itself, to draw the plunger 290 upwardly and seal the outlet of the pump priming valve.
- the vacuum motor 74 operates to draw the air from the system, it is likely that some fluid will enter the pump priming valve 280 .
- the size of the elongated fluid chamber 286 is dimensioned to accommodate a sufficient amount of fluid to permit full priming of the pump 112 .
- the fluid level will rise inside the pump priming valve 280 and fluid will enter the ball chamber 286 .
- the plunger 290 is preferably formed of a material and dimension such that the fluid alone does not cause the plunger to rise in the chamber.
- the combined pulling force from the negative air pressure and the pushing force from the rising liquid inside the chamber acting on the plunger causes the plunger to rise until the sealing tip 296 bears against the shoulder 292 and seals the aperture 294 to prevent solution from flowing therefrom. Once this seal has established, the pump should be sufficiently primed for normal operation.
- the pressurized solution is simultaneously directed to the accessory hose solution tube mounting 116 and a conventional trigger valve 300 .
- the trigger valve 300 is positioned in the base of the handle 18 immediately below the bottom end of an actuator rod 302 .
- the rod 302 extends upwardly to pivotally interconnect with the trigger 60 provided in the closed loop grip 58 of the handle 18 .
- multiple actuator rods 302 are interconnected to traverse the distance between the trigger 60 and the trigger valve 300 .
- the actuator rods 302 are displaced downwardly to squeeze the plunger 304 of the conventional trigger valve 300 and permit the flow of fluid therethrough.
- pressurized fluid flows through a conventional conduit 306 to a pair of spray tips 114 mounted to the foot member 24 immediately adjacent the agitation brush.
- the spray tips 114 are adapted to create a fan-shaped spray pattern which traverses substantially the entire width of the agitation brush and suction nozzle opening.
- the vacuum motor 74 and impeller fan 76 generate negative air pressure which is communicated from the upper housing 16 to the base assembly 14 for recovery of used solution and dirt.
- the working air flow path for on-the-floor cleaning begins at the suction nozzle opening 316 provided at the front, forward edge of the base assembly 14 .
- the suction nozzle opening is defined by a front plate member 318 and a rear plate member 320 which are mounted to one another and which also define the initial working air flow conduit 322 .
- the suction nozzle opening 316 extends the entire width of the base assembly 14 and the plate members 318 , 320 .
- a pair of sidewalls 324 are integrally formed into the rear plate member to define the sides of the initial flow conduit.
- the sidewalls 324 taper upwardly and inwardly (see FIG. 1).
- the initial flow conduit 322 terminates at an outlet 326 positioned along the top edges of the plate members and sidewalls.
- the length of the outlet of the initial suction flow conduit is less than the length of the suction nozzle opening and the width of the base assembly 14 .
- an elastomeric gasket 328 is mounted to the top edges of the front and rear plates 318 , 320 and surrounds the outlet 326 .
- the air/water/debris mixture flows into recovery tank 30 which is an assembly of a bottom member 308 and a top member 310 having a top wall 364 , a pair of sidewalls 366 , and a rear wall 368 .
- the working air flows from the initial flow conduit 322 to an intermediate working air flow conduit 330 which is defined by a depression 332 formed in the top wall 364 of the recovery tank 30 and a cover plate 336 secured thereto.
- the depression 332 comprises a bottom wall 338 and a pair of opposed sidewalls 340 .
- the sidewalls 340 initially taper inwardly from the inlet 342 of the intermediate working air conduit a short distance and then ultimately extend parallel to one another approaching the outlet 344 of the intermediate working air conduit 330 .
- the cover plate 336 is formed of a transparent, plastic material, and the top wall 364 and sidewalls 346 of the recovery tank 30 are formed of a smokey, translucent material. Utilizing these materials and the structure of the intermediate flow conduit 330 , the user can easily observe the dirt and water passing up through the intermediate flow conduit 330 and also easily observe the fluid level inside the recovery tank 30 .
- the outlet 344 of the intermediate flow conduit 330 is positioned immediately adjacent an air/water separator baffle 350 which is integrated into the recovery tank 30 and is formed by a downwardly extending rear wall 352 , a pair of parallel, downwardly extending sidewalls 354 , and a bottom wall 356 extending forwardly from the rear wall 352 .
- a sealing pocket 429 is integrally formed along the rear wall 352 .
- the effective cross-sectional area of the working air conduit is dramatically increased as the air/water mixture passes from the intermediate working air conduit into the air/water separator baffle and the recovery tank. This sudden increase in cross-sectional area results in a significant drop in velocity for the working air, thereby assisting in the separation of dirt and water from the air.
- a fluid containment baffle 370 is mounted inside the hollow interior of the recovery tank 30 and is intended to prevent excessive sloshing of the recovered dirt and liquid and also contain any foam generated inside the tank.
- the baffle 370 comprises a front, downwardly extending portion 372 and a rear downwardly extending portion 374 which are spaced from one another but interconnected to one another by multiple stringers 376 .
- the stringers 376 and edges of the front 372 and rear portions 374 define fluid apertures 378 therebetween.
- the baffle 370 is mounted to the rear wall 368 , sidewalls 366 , and top wall 364 of the top member 310 a spaced distance from the bottom member 308 .
- the fluid flow apertures 378 are positioned immediately below the air/water separator 350 so that as the dirt and water drop therefrom, they pass through the apertures 378 into the lowermost portion of the recovery tank 30 .
- the front 372 and rear 374 portions of the baffle 370 are contoured to prevent excessive sloshing of the recovered liquid during movement of the cleaner 12 .
- the water and dirt present within the tank will surge toward the front of the recovery tank 30 .
- the water will strike the sloping top wall 364 of the recovery tank 30 and be deflected rearwardly. Any water which may be deflected upwardly will strike the downwardly extending front portion 372 of the baffle 370 and, therefore, be deflected downwardly to the lowermost portion of the recovery tank 30 .
- the downwardly extending rear portion 374 of the baffle 370 will similarly deflect fluid downwardly.
- the baffle 370 serves to prevent excessive sloshing of fluid in the tank and also provides the added benefit of containing any foam which may build up in the tank beneath the baffle 370 spaced away from the air/water separator baffle 350 and fluid outlet.
- An air flow outlet stand pipe 380 is integrally formed into the bottom member 308 and is provided at the rear of the recovery tank 30 .
- the stand pipe extends upwardly to a point adjacent the uppermost portion of the recovery tank 30 , opposite the outlet of the air/water separator baffle 350 .
- an inlet opening 382 of the stand pipe 380 is positioned vertically above the baffle 370 .
- a manifold chamber 384 is formed at the bottom of the stand pipe 380 and defined by the bottom member 308 and the foot member 24 .
- an elastomeric gasket 388 is mounted to the top of the manifold chamber 384 to create a substantially air-tight seal between the bottom of the stand pipe 380 and the manifold chamber 384 .
- the manifold chamber 384 is shown integrally molded to the base member 24 .
- the manifold chamber 384 is formed separately from the base member 24 and includes downwardly extending hooks (not shown) that engage with cantilevered arms (not shown) on the base member 24 .
- the hooks are shaped to contact an upper surface of the arms and flex the arms downwardly when the manifold chamber 384 is installed.
- a locking surface (not shown) on the hooks then engages a lower surface of the arms to lock the manifold chamber 384 to the base member 24 .
- a flexible conduit hose 386 extends from one end of the manifold to the impeller fan chamber mounted in the lower portion of the upper housing 16 .
- the conduit 386 is preferably formed of a pliable, yet durable material.
- a float 390 is provided inside the recovery tank 30 to prevent overfilling of the recovery tank 30 with fluid.
- the float 390 comprises a buoyant base 392 and a closure plate 394 interconnected to one another by a support plate 396 .
- the closure plate 394 is dimensioned to fully seal the inlet opening 382 of the stand pipe 380 and prevent the flow of air or liquid therethrough.
- the float 390 is limited primarily to vertical movement with respect to the recovery tank 30 , with the closure plate positioned above the fluid containment baffle 370 and the buoyant base 392 positioned below the fluid containment baffle 370 .
- the fluid containment baffle 370 also includes an aperture 398 through which the stand pipe 3 80 extends.
- a narrow slot 400 is also provided in the rear portion 374 of the fluid containment baffle 370 through which the support plate 396 of the float 390 extends.
- the closure plate 394 is positioned above the fluid containment baffle 370 and the buoyant base 392 is positioned below the baffle 370 .
- Movement of the float is constrained because the buoyant base is captured in a float cage defined by the front wall 402 of the stand pipe 380 , a pair of L-shaped walls 404 , 406 (FIG. 10) extending up from the bottom member 308 , a substantially planar wall 408 extending upwardly from the bottom member 308 intermediate the two L-shaped wall members 404 , 406 and the rear portion 374 of the fluid containment baffle 370 .
- Multiple slots 412 or fluid flow apertures are provided between the wall members 404 , 406 , 408 and the stand pipe 380 so that fluid will quickly and easily flow into the float cage defined by these elements.
- the float 390 will also rise until eventually, the closure plate 394 nears the inlet opening 382 of the stand pipe 380 .
- the closure plate 391 is sufficiently drawn against the stand pipe opening 394 by the suction from the vacuum motor 74 to close the air flow therethrough as illustrated by the phantom lines in FIG. 9. Once this happens, the pitch of the operating vacuum motor 74 is sufficient to warn the user that the recovery tank 30 is full and must be emptied.
- the cover plate 336 has a triangular-shaped accessory hose flow aperture 422 and a lock aperture 428 .
- a cover closure cap 420 has a spring arm 446 with a barb 448 which seats beneath the wall of the cover plate 336 at the lock aperture 428 when the cover cap 420 is seated over the aperture 428 .
- a pair of retaining projections 423 extend rearwardly from a front edge of the aperture 422 into recesses 425 in a depending flange 421 of the cover cap 420 when the cover cap 420 is seated over the aperture 428 . The cap 420 can thus pivot about the projections 423 as the cap is fastened over and removed from the aperture 422 .
- the recovery tank 30 is quickly and easily emptied by first tilting the handle 18 and upper housing 16 rearwardly. Then, the latches 32 are disengaged from the projections 34 on the recovery tank 30 .
- the user grasps the handle 36 and merely lifts the tank 30 from the foot member 24 and transports it to an appropriate site for emptying the tank 30 .
- the tank 30 can also be removed from the foot member 24 without tilting the handle 18 and upper housing 16 . In any event the tank 30 can then be emptied by removing a cap 414 mounted to the drainage aperture 416 provided on the rear wall 368 of the tank 30 . Once the tank 30 has been emptied, the cap 414 is replaced, the tank 30 is lowered down onto the foot member 24 , and finally, the latches 32 are snapped over the projections 34 to lock the tank to the base assembly 14 .
- the entirety of the accessory hose 52 is contained on the accessory hose storage rack 50 when the cleaning machine 12 is used for on-the-floor cleaning or when the machine is being stored.
- the user unsnaps the grip tube 64 from the C-shaped clip 66 of the hose rack 50 and unwinds the hose therefrom and then removes the accessory hose mounting member 62 from its corresponding C-shaped clip on the storage rack 50 .
- the user removes the cap 420 (FIG. 10) from the recovery tank cover plate 336 , exposing the accessory hose flow aperture 422 and inserts the accessory hose mounting member 62 therein.
- the mounting member 62 comprises an elbow-shaped rigid conduit 424 which receives the flexible hose on one end thereof and a triangular shaped mounting plate 426 on the other end thereof.
- the accessory hose flow aperture 422 is preferably formed directly above the air/water separator baffle 350 when the cover plate 336 is mounted to the top member 310 of the recovery tank 30 .
- the lock aperture 428 is also formed in the cover plate 336 , directly adjacent the accessory hose flow aperture 422 .
- the accessory hose mounting member 62 comprises a flange 430 which extends downwardly from the triangular support plate 426 .
- the flange 430 is substantially complementary to the inside edge of the aperture 422 and is adapted to be snugly received therein.
- a baffle wall 432 extends downwardly along the front edge of the triangular flange 422 and has a recess 432 a which receive the projections 423 .
- the baffle 432 extends substantially the entire width of the intermediate working air conduit 330 and extends downwardly a sufficient distance to contact the bottom wall 338 of the conduit to thereby effectively seal the intermediate flow conduit 330 from the air/water separator baffle 350 and the vacuum motor 74 . Therefore, substantially all of the working air drawn into the recovery tank 30 comes from the accessory hose 52 when the accessory hose 52 is mounted to the base as illustrated in FIG. 12.
- the accessory hose mounting member 62 is retained in the aperture 422 by a U-shaped spring arm 434 which is received in the lock aperture 428 and a sealing pocket 429 located immediately below the aperture 428 .
- the sealing pocket 429 is integrally formed with the rear wall 352 of the baffle 350 and includes a front wall 431 and a pair of side walls 433 extending between the front wall 431 and the baffle rear wall 352 .
- the spring arm 434 comprises a pair of opposed legs 436 , 438 connected to each other through a central bight portion 435 .
- the leg 436 extends downwardly from the triangular-shaped support plate.
- a locking barb 440 is provided on the outside edge of the free leg 438 and a projection 442 is provided at the terminal end of the free leg 438 .
- the bight portion of the U-shaped arm 434 is initially inserted into the lock aperture 428 .
- the locking barb 440 bears against one edge of the aperture 428 , thereby flexing the free leg 438 inwardly toward the other leg 436 .
- the locking barb 440 will drop below the inside edge of the cover plate 336 at the aperture 428 and the resilient U-shaped spring arm 434 will spring outwardly to seat the barb beneath the cover plate 336 edge.
- the edge of the cover plate 336 at the aperture 428 will be captured between the outer projection 442 and the locking barb 440 of the spring arm 434 .
- the structure of the cap 420 is quite similar to the accessory hose mounting member 62 in that it includes an identical spring arm 446 and a substantially complimentary triangular flange extending downwardly therefrom.
- the cap 420 does not include the downwardly extending baffle wall which seals the intermediate working air flow path 330 .
- the preferred embodiment of the cleaning machine 12 includes a rotatively mounted agitation brush which is adapted for easy and instantaneous vertical adjustment.
- the agitation brush assembly comprises a brush dowel 450 fixedly mounted on a shaft 452 .
- the ends of the shaft 452 are received in bearings 454 which in turn are press-fit into inwardly extending bosses 456 provided on a pair of opposed articulating arm members 458 .
- stub shafts (not shown) can extend from the arm members 458 and the shaft 452 can be replaced with bearings similar to 454 for rotational installation of the dowel 450 on the arm members 458 .
- Each arm member 458 comprises a back plate 460 with a pivot pin 462 provided at the rear of the plate 460 and a limit arm 464 provided at the front of the plate 460 .
- a laterally extending belt guard 466 is preferably integrally formed with the articulating arm 458 .
- the belt guard 466 extends laterally inwardly enough to cover the drive belt 468 in the assembled position.
- the belt guard 466 protects the belt 468 from threads and other foreign material becoming lodged therein and also protects the carpet or other surface positioned below the base assembly 14 from the rotating belt 468 .
- the drive belt 468 extends around a pulley 470 mounted at one end of the brush dowel 450 and a drive shaft and pulley 472 of the brush motor 474 .
- the pivot pins 462 of the arm member 458 are captured between a bearing surface 476 integrally formed into the bottom of the foot member 24 and a retaining member 478 having a bearing surface 480 formed thereon.
- the pivot pin 462 is captured between the bearing surfaces 480 , 476 of the retaining member 478 and the foot member 24 .
- the retaining member 478 is secured to the foot member 24 by a conventional fastener, such as a screw 482 .
- the limit arms 464 provided at the front of the retaining members 478 are preferably integrally molded with the retaining members and are adapted to limit the downward movement of the brush assembly relative to the foot member 24 .
- Each limit arm 464 has a forwardly extending barb 484 provided at the terminal end of the arm 464 . In the operative position, the barb 484 is positioned above a rearwardly extending projection 486 provided on the foot member 24 . As seen in FIG. 9, as the agitation brush assembly extends further and further downward, the barb 484 on the end of the limit arm 464 will contact the projection 486 and prevent any further downward movement.
- the cleaning machine 12 can almost instantaneously adapt to varying carpet naps or other inconsistencies on the surface being cleaned.
- the brush arms also allow the rotating brush to drop below the normal floor plane to provide contact with the floor when a bare floor cleaning attachment raises the suction nozzle opening height from the floor.
- a floating strip agitation brush 490 could be incorporated in the cleaning machine 12 , as seen in FIG. 14.
- the floating strip agitation brush 490 is easily adapted for incorporation into the cleaning machine 12 .
- the strip brush 490 comprises a linear brush body 492 with bristles 494 extending downwardly therefrom and a pair of integrally molded arms 496 .
- Each of the arms 496 is formed by a pair of opposed plates 498 , 500 and a pivot pin 502 extending between the rear most edge of the opposed plates 498 , 500 .
- the pivot pins 502 in this embodiment are secured to the foot member 24 in the same manner as the pivot pins 462 shown previously in FIG. 13. Namely, the pivot pins 502 are captured between the bearing surface 476 of the foot member 24 and the bearing surface 480 formed on the retention member 478 which is securely fastened to the foot member 24 by conventional fasteners 482 . With this structure, the strip brush 490 can move vertically in response to changes in the carpet nap or other inconsistencies in the surface being cleaned.
- the accessory hose solution tube mounting 116 is used primarily for connecting an accessory nozzle, such as found in the upholstery tool 68 in order to provide cleaning solution to the surface being cleaned. It is contemplated, however, that an elongate spray wand can be provided as an accessory attachment for the solution tube mounting 116 .
- the detergent tank 44 could hold an insecticide solution that is mixed with water or other liquid from the clean water tank 42 in an adjustable ratio for the treatment of fleas or ticks, as an example.
- the vacuum motor 74 and the brush motor 474 would be turned off, with the solution pump 112 turned on to deliver the insecticide solution to a surface.
- the clean water tank 42 could hold the insecticide solution or some other solution that is to be directly applied to a surface.
- the water extraction cleaning machine according to the invention overcomes several of the problems of the prior art. Namely, the cleaning machine is easily adapted for a variety of cleaning operations. For example, the detergent to water mixture ratio can be altered nearly instantaneously. In addition, the height of the agitation brush with respect to the suction nozzle opening changes immediately in response to changes in the carpet nap and other inconsistencies in the surface being cleaned.
- the cleaning machine according the invention also provides easy and convenient means for filling and emptying the clean water and detergent tanks. Similarly, the recovery tank can be quickly and easily removed for emptying or cleaning.
- the accessory hose intended for use with the cleaning machine according to the invention is preferably stored on the machine at all times when not in use. This minimizes the storage space required for the machine and accessories and simultaneously ensures that the user has all attachments and accessories contained on the machine, regardless of where the machine is being used.
Abstract
Description
- This application is a continuation-in-part of U.S. patent application Ser. No. 08/741,746 filed on Nov. 5, 1996, which claims the benefit of U.S. Provisional Application Nos. 60/007,289 filed on Nov. 6, 1995; 60/006,665 filed on Nov. 13, 1995; 60/017,175 filed on May 9, 1996; and 60/026,988 filed on Sep. 20, 1996.
- 1. Field of the Invention
- This invention relates to cleaning machines and, more particularly, to an upright water extraction cleaning machine.
- 2. Description of the Related Art
- Water extraction cleaning machines have long been used for removing dirt from surfaces such as carpeting, upholstery, drapes, and the like. The known water extraction cleaning machines can be in the form of a canister-type unit as disclosed in U.S. Pat. No. 5,237,720 to Blase et al. or an upright unit as disclosed in U.S. Pat. No. 5,500,977 to McAllise et al. and U.S. Pat. No. 4,559,665 to Fitzwater.
- The current water extraction cleaners can be difficult to use and often have limited adaptability for a variety of cleaning conditions. For example, none of the known water extraction cleaners can quickly and efficiently vary the mixture ratio of detergent and water. In addition, none of the known upright water extraction cleaners can automatically adjust the height of the roller-type agitation brush in response to changes on the surface being cleaned. Another problem inherent with the known water extraction cleaners is ease of use in filling and emptying the clean water tank and recovery tank. Finally, none of the known prior art water extraction cleaners can quickly and easily convert between on-the-floor cleaning and off-the-floor cleaning with an accessory hose and cleaning tool.
- According to one embodiment of the invention, a portable surface cleaning apparatus has a base for movement along a surface to be cleaned; an upright handle pivotally attached to a rearward portion of the base; a liquid dispensing nozzle associated with the base for applying liquid to the surface; first and second liquid holding tanks fluidly connected to the dispensing nozzle for supplying first and second liquids, respectively, and mixtures thereof to the dispensing nozzle; a fluid recovery tank; a suction nozzle mounted to the base; a working air conduit extending between the recovery tank and the suction nozzle; and a vacuum source in fluid communication with the recovery tank for generating a suction in the recovery tank, conduit and nozzle to thereby draw liquid from the surface and deposit the liquid in the recovery tank.
- An adjustable mixing valve can be fluidly connected between the liquid holding tanks and the dispensing nozzle for changing the mixing ratio of the first liquid with respect to the second liquid. The mixing valve has a hollow valve body with an internal mixing chamber, a first inlet opening extending through the valve body in fluid communication between the internal mixing chamber and a first liquid supply tank, a second inlet opening extending through the valve body in fluid communication between the internal mixing chamber and the second liquid supply tank, an outlet opening extending through the valve body in fluid communication between the internal mixing chamber and the dispensing nozzle, and a plunger mounted in the valve body for reciprocal movement therein and including an end portion extending through the valve body and a valve stem positioned relative to one of the first and second inlet openings. Preferably, the valve stem has a shape to vary the flow rate of fluid through the one inlet opening as the plunger moves axially with respect to the valve body. With this arrangement, the mixing ratio of the first and second liquids can be adjusted.
- Preferably, the valve stem has on an outer surface thereof a groove that tapers from an end portion of the valve stem. The valve stem is positioned in the one inlet opening and thereby reduces the flow of the one liquid when the valve stem is moved into the one inlet opening.
- A cam follower is preferably attached to an outer end of the shaft and a manually rotatable selector switch with a cam element is mounted on the valve body. The cam follower rides along the cam element upon rotation of the selector switch to axially move the plunger and thereby vary the mixing ratio of the first and second liquids in the mixing chamber.
- According to another embodiment of the invention, a portable surface cleaning apparatus has a base for movement along a surface to be cleaned, an upright handle pivotally attached to a rearward portion of the base, a fluid recovery tank having an inner fluid holding chamber, a first suction nozzle mounted to the base, a working air conduit extending between the inner chamber and the suction nozzle, and a vacuum source in fluid communication with the inner chamber for generating a suction in the recovery tank, conduit and nozzle to thereby draw liquid from a surface and deposit the liquid in the recovery tank. A hose opening is formed in the working air conduit and a cap is removably mounted in the hose opening. An accessory hose having a first end is adapted for mounting in the hose opening for fluid connection to the working air conduit and a second end adapted for connection to a cleaning tool with a second suction nozzle. Preferably, the hose first end has a baffle wall adapted to block the flow from the first suction nozzle to the recovery tank when the hose first end is received in the hose opening. A retainer lip is formed on the base adjacent the hose opening. A resilient arm on the hose first end has retainer thereon for seating beneath the retainer lip in a snap-fit relationship to the base. With this arrangement, the hose first end can be retained.
- A pivot mount can be provided between the hose first end and the hose opening, such that the hose first end can be rotated into mounted position in the hose opening.
- According to a further embodiment of the invention, a recovery tank adapted for attachment to the base of a portable surface cleaning apparatus comprises an upper wall, a lower wall and at least one side wall connected together to define an enclosed chamber. The upper wall has an enclosed channel defining a conduit and an opening extending from the conduit into the chamber. The conduit is in fluid communication between a suction nozzle and a vacuum source of the cleaning apparatus when the recovery tank is attached to the base to thereby draw liquid and debris from a surface and deposit the liquid and debris into the recovery tank. A baffle is attached to an inner surface of the upper wall adjacent the upper wall opening. The baffle extends into the inner chamber from the upper wall to thereby separate fluid and debris from the air during cleaning operations.
- According to a further embodiment of the invention, a recovery tank is adapted for attachment to the base of a portable surface cleaning apparatus having a handle attached to the base and a suction nozzle adapted for fluid communication with the recovery tank and a vacuum source. The recovery tank comprises an upper wall, a lower wall and at least one side wall connected together to define an enclosed chamber for holding a predetermined level of recovered liquid from a surface being cleaned. A first opening is formed in one of the recovery tank walls above the predetermined level for fluid communication between the recovery tank and the suction nozzle. A second opening is formed in one of the walls of the recovery tank below the predetermined level for fluid communication between the recovery tank and the vacuum source. An exhaust stand pipe has a lower end attached to an inner surface of the recovery tank. The stand pipe lower end surrounds the second opening while an upper free end of the exhaust pipe extends above the predetermined level. With this arrangement, liquid at or below the predetermined level in the recovery tank is at least substantially prevented from entering the second opening and traveling to the vacuum source when the recovery tank is mounted on the base.
- An elongate float has a first end that is buoyant and a second end that is adapted to cover the upper free end of the stand pipe when liquid in the recovery tank reaches the predetermined level to thereby block the transfer of air and liquid from the recovery tank to the vacuum source. Preferably, at least one guide wall extends from the lower wall adjacent the stand pipe and the first buoyant end of the float is located between the stand pipe and the guide wall for guiding movement of the float second end toward the stand pipe upper free end during liquid rise in the recovery tank.
- According to an even further embodiment of the invention, a brush assembly is pivotally connected to the base and includes an elongate member extending substantially parallel with, and in proximity to the suction nozzle. The elongate member has a plurality of bristles projecting outwardly therefrom to contact a surface to be cleaned. The brush assembly further includes at least one pivot arm with a first end mounted to the elongate member and a second end pivotally mounted to the base such that the height of the bristles can be varied to automatically adjust for different surface heights. A catch projects from one of the pivot arm and the base and a stop member projects from the other of the pivot arm and the base toward the catch, the catch and stop member being mutually engageable to arrest downward travel of the elongate member beyond a predetermined limit when the bristles are disengaged from the surface.
- According to an even further embodiment, a brush assembly is pivotally connected to the base and includes an elongate, substantially cylindrical member extending substantially parallel with, and in proximity to the suction nozzle. At least one pivot arm has a first end mounted to the elongate member for rotation of the elongate member with respect to the pivot arm and a second end pivotally mounted to the base, such that the brush assembly is free floating to automatically adjust to different surface heights. A motor is mounted to the base and a transmission member is connected between a shaft of the motor and the elongate member for rotating the elongate member when the motor is actuated. The at least one pivot arm comprises a side wall with a bearing surface mounting the elongate member for rotation about a longitudinal axis and a bottom wall integrally formed with the side wall. The bottom wall is in vertical alignment with the transmission member to thereby cover at least a lower portion of the transmission member.
- According to another embodiment of the invention, an improved upright water extraction cleaning machine comprises a base adapted for movement across a supporting surface, a handle pivotally mounted to the base, a fluid pump having a fluid inlet connected to at least one liquid holding tank and a fluid outlet connected to at least one spray nozzle to thereby transfer liquid from the at least one holding tank to the at least one spray nozzle under pressure and distribute the liquid onto the supporting surface, a suction nozzle mounted to the base to remove liquid and debris from the surface, and a vacuum source mounted to one of the base and the handle and connected to the suction nozzle to generate a working air flow for recovering the liquid and debris. A priming valve having a valve body with an interior chamber includes a valve inlet port connected to the pump outlet and a valve outlet port connected to the vacuum source. A plug is located within the interior chamber and is movable between a priming position wherein the plug is spaced from the valve outlet such that liquid can be drawn into the interior of the hollow body when the vacuum source is operating, and a sealing position wherein the plug seats against the valve outlet port to block liquid from entering the vacuum source.
- Preferably, the weight and dimension of the plug is chosen such that the combined presence of negative air pressure on the plug and movement of liquid in the interior chamber toward the valve outlet is sufficient to move the plug toward the valve outlet.
- The invention will now be described with reference to the drawings in which:
- FIG. 1 is a front, perspective view of an upright water extraction cleaning machine according to the invention;
- FIG. 2 is a rear, perspective view of the upright water extraction cleaning machine of FIG. 1;
- FIG. 3 is a partial, side-elevational view showing a pivot mounting and locking arrangement of the upper housing to the base according to a first embodiment;
- FIG. 3A is an enlarged side-elevational view shown in area A of FIG. 3 with the upper housing tilted with respect to the base;
- FIG. 3B is a view similar to FIG. 3 showing a pivot mounting and locking arrangement according to a second embodiment;
- FIG. 4 is a schematic view showing the cleaning fluid distribution system of the cleaning machine of FIG. 1;
- FIG. 5 is a partial, sectional, exploded view of the tank assembly and handle;
- FIG. 6 is a partial, sectional, exploded view of the tank one-way valve and tank seat assembly;
- FIG. 7 is a partial sectional view of the variable fluid mixing valve mechanism shown in a first position;
- FIG. 8 is a partial sectional view of the variable fluid mixing valve of FIG. 7 shown in a second position;
- FIG. 9 is a partial, sectional view of the foot member and recovery tank taken along lines9-9 of FIG. 1;
- FIG. 10 is an exploded view of the recovery tank assembly;
- FIG. 11 is a front perspective view of the upright water extraction cleaning machine of FIG. 1 showing the accessory hose mounted in the operative position;
- FIG. 12 is a partial, sectional view showing the mounting of the accessory hose to the recovery tank;
- FIG. 13 is a partial, exploded view of the agitation brush assembly and foot member; and
- FIG. 14 is a perspective view of an alternative embodiment of the agitation brush of FIG. 13.
- Referring now to the drawings and to FIGS. 1 and 2, in particular, an upright water
extraction cleaning machine 12 is shown which comprises abase assembly 14, anupper housing 16 pivotally mounted to thebase assembly 14, ahandle 18 extending upwardly from theupper housing 16, and atank assembly 20 mounted to and supported by both thehandle 18 andupper housing 16. - The
base assembly 14 comprises a foot orbase member 24, a pair ofrear wheels foot member 24, and arecovery tank 30 removably supported on thefoot member 24. A pair of over-center latches 32 are provided, one on each side of thefoot member 24, and are adapted to cooperate with a pair of projections 34 (FIG. 10), one provided on each side of the recovery tank sidewall for locking therecovery tank 30 to thefoot member 24. Ahandle 36 is pivotally mounted to therecovery tank 30 for carrying the tank. - As described further below, the
tank assembly 20 comprises aclean water tank 42 and adetergent tank 44 which nests inside the front surface of theclean water tank 42. A pair of over-center latches 46 are provided, one on each side of the sidewall of theupper housing 16. Thelatches 46 are adapted to cooperate with a pair of projections 48 (FIG. 5), one of which is provided on each of the sidewalls of theclean water tank 42, for locking thetank assembly 20 to theupper housing 16 and handle 18. - An accessory
hose storage rack 50 is mounted to the rear surfaces of thehandle 18 andupper housing 16. Therack 50 includes anupper portion 51 and alower portion 53 and is adapted to support and store anaccessory hose 52 when the hose is not in use. An accessoryhose mounting member 62 is mounted on one end of thehose 52 and is received in a C-shapedclip 66 provided on the upper end of therack 50. The flexible body of thehose 52 is wrapped around the upper andlower portions storage rack 50. Agrip tube 64 is mounted on the other end of thehose 52 and is snapped into the C-shapedclip 66 integrally molded into therack 50. In this position, the entire length of theaccessory hose 52 is supported on therack 50 and is easily transported with and stored on the cleaningmachine 12. Preferably, theaccessory hose 52 remains on the rack at all times, except when thehose 52 is in use. A double C-shaped clip 67 (FIG. 2) can be provided at one or more locations to clamp adjacent portions of thehose 52 together when the hose is stored on the machine. The double C-shapedclip 67 can be removed from the hose when the hose is unwrapped for use. - The
grip tube 64 of theaccessory hose 52 is adapted to receive cleaning tools such as theupholstery tool 68 shown in FIGS. 1 and 2. However, any number of a variety of cleaning tools can be received on thegrip tube 64 such as a crevice spray tool as seen in U.S. patent application Ser. No. 08/574,769 which is expressly incorporated herein by reference or, alternatively, a window washing tool as seen in U.S. patent application Ser. No. 08/683,608 which is also expressly incorporated herein by reference. - A
closed loop grip 58 is provided at the terminal end of thehandle 18 and atrigger 60 is pivotally mounted to thehandle 18 inside theclosed loop grip 58. As described further below, thetrigger 60 is used to control the distribution of cleaning solution from thebase assembly 14. - A
releasable latch 40 is mounted to thebase assembly 14 and is adapted to retain thehandle 18 andupper housing 16 in the upright, stored position as seen in FIGS. 1 and 2. Thehandle 18 can be tilted rearwardly by grasping thehandle 18 and depressing thelatch 40 relative to thebase assembly 14. With thelatch 40 depressed, the handle is then tilted rearwardly with respect to thebase assembly 14. - A three-position
electrical switch 54 is mounted to the rear of thehandle 18. The three positions of the switch are as follows: (a) all systems off, (b) the “pre-treat” position in which both the cleaning solution pump and agitation brush are on but the vacuum motor is turned off, and (c) the “cleaning position” in which the vacuum motor, agitation brush, and cleaning solution pump are all on. - An
electrical cord 56 extends outwardly from theupper housing 16 and is electrically connected to the three-position switch 54. A pair of opposed cord wraps 70, 72 are provided on the upper andlower portions storage rack 50 for containing theelectrical cord 56 when themachine 12 is not in use. - A large number of the operative components of the
machine 12 are mounted to or provided inside theupper housing 16 and handle 18. As noted previously, thetank assembly 20 is supported on thehandle 18 andupper housing 16. Avacuum motor 74 andimpeller fan 76 are mounted in the round, bulbous lower portion of theupper housing 16. The upper portion of the upper housing supports a large number of components of the water distribution system such as the solution pump mixing valve which will be described in greater detail, below. - FIG. 3 shows the pivot mounting and locking assembly of the
upper housing 16 to thebase assembly 14. In this side-elevational view, thewheel 26 is shown in phantom lines to reveal the pivot mounting and locking assembly of these two elements. The pivot mounting itself is identical for both the right and left sides of theupper housing 16, and therefore, only the left side will be described in detail. - The foot or
base member 24 includes an upwardly extendingrear support member 80 with asemi-circular bearing surface 82 integrally formed therein. A substantiallycircular boss 84 extends outwardly from thesidewall 86 of theupper housing 16 and is adapted to be received in the bearingsurface 82. Aretention member 88 having an integrally molded substantiallysemi-circular bearing surface 90 formed therein is adapted to be secured to the top surface of thesupport member 80, thereby capturing the outwardly extendingboss 84 of theupper housing 16 between the opposed semi-circular bearing surfaces 82, 90. The aprojection 92 formed on theretention member 88 fits within a groove of thefoot member 24. Therear portion 89 of the retention member can be secured to thefoot member 24 through a screw-type fastener 91 passing through theprojection 92 and into thefoot member 24. Afront portion 96 of theretention member 88 has a pair of tabs 102 (only one of which is shown) extending downwardly therefrom. A free end of eachtab 102 includes abarb 104 that snaps within a corresponding groove (not shown) in thefoot member 24 to secure thefront portion 96 of theretention member 88 to thefoot 24. - Referring now to FIGS. 3 and 3A, a locking
assembly 105 is preferably located on the left side of the cleaningmachine 12, although it is to be understood that the locking mechanism can alternatively or in addition be arranged on the right side. The lockingassembly 105 includes afoot engagement section 107 and astem 109 formed integrally with thefoot engagement section 107. Apivot pin 101 extends through atab 111 on theretention member 88 and thestem 109 to pivotally attach thefoot engagement section 107 to thebase member 24. Aflat spring 113 is integrally formed with thestem 109 with afree end 127 thereof abutting an upper surface of the retention memberrear portion 89. Thespring 113 biases thefoot engagement section 107 toward thefront portion 96. A lockingextension 115 includes aflat locking surface 117 and abearing surface 119. Thebase member 24 includes a semi-cylindrical laterally extendingprotrusion 125 which is located on theside wall 86 with aflat locking surface 121 and acurved bearing surface 123. - In the normally upright position, as shown in FIG. 3, the flat locking surfaces117, 121 abut each other or are in close proximity to each other. If a user attempts to rotate the
handle 18 with respect to thefoot member 24, the locking surfaces 117, 121 engage and prevent relative rotation of the handle and foot member. When thefoot engagement portion 107 is depressed, as shown in phantom line, the lockingextension 115 rotates away from theprotrusion 125 until the locking surfaces are no longer in facing relationship. In this position, thehandle 18 can be rotated with respect to thebase member 24. When the handle is rotated to the upright position, the bearingsurface 119 engages the bearingsurface 123 to rotate thefoot engagement portion 107 against the bias ofspring 113 until thelocking extension 115 is clear of theprotrusion 125 and the locking surfaces 117, 121 are again in facing relationship. - As described further below in relation to FIG. 9, the preferred embodiment of the cleaning
machine 12 incorporates a rotatably mounted agitation brush which receives the force of rotation from a brush motor mounted to thefoot member 24. In any position other than the off position for theswitch 54, electrical current is supplied to the brush motor for rotating the agitation brush. However, when theaccessory hose 52 is being utilized, or when thehandle 18 is merely in the upright position and the switch is in either the pretreat or cleaning position, it is undesirable to permit continued rotation of the agitation brush. Therefore, an interruptswitch 98 is provided in the electrical circuit between the brush motor and the source of electricity. Theswitch 98 is mounted to thefoot member 24 and adapted to cooperate with aprojection 100 extending outwardly from the front, bottom surface of theupper housing 16. In the position as shown in FIG. 3, theprojection 100 bears against theswitch 98, thereby opening the electrical circuit between the source of electricity and the agitation brush. Therefore, the brush will not rotate, regardless of the position of the three-position switch 54. Upon rearward titling movement of thehandle 18 andupper housing 16 relative to thebase assembly 14, theprojection 100 will pivot out of contact with the interruptswitch 98 mounted on thefoot member 24. Once theprojection 100 has moved out of contact with theswitch 98, then theswitch 98 will assume a closed position and complete the circuit between the source of electricity and the brush motor, assuming that the three-positionelectrical switch 54 is in any position other than off. Alternatively, the relative position of the switch and projection can be reversed so that the switch is mounted on the upper housing and selectively contacts a projection mounted on thefoot member 24. Instead of theprojection 100, a spring and biased pin can be mounted to the upper housing orfoot member 24 in order to provide additional travel for actuating theswitch 98. When the pin is mounted to the foot member, the switch is preferably mounted to the upper housing. - In an alternative arrangement, the
switch 98 can be replaced by an ON/OFF switch that is mounted at a convenient location on the cleaningmachine 12 for actuation by a user. - With the
upper housing 16 and handle 18 pivotally mounted to thebase assembly 14, the water extraction cleaning machine can be used in a manner similar to an upright vacuum cleaning machine. In other words, the operator can grasp theclosed loop grip 58 and manipulate thebase assembly 14 forward and backward over the surface being cleaned. - With reference now to FIG. 3B, a pivot mounting and locking
assembly 105′ according to a second embodiment is illustrated, wherein like parts in the previous embodiment are represented by like numerals. As with theassembly 105, theassembly 105′ is preferably located on the left side of the cleaningmachine 12, although it is to be understood that the locking mechanism can alternatively or in addition be arranged on the right side. The lockingassembly 105′ includes afoot engagement section 107′ and astem 109′ formed integrally with thefoot engagement section 107′. As in the previous embodiment, apivot pin 101 extends through atab 111 on theretention member 88 and thestem 109′ to pivotally attach thefoot engagement section 107′ to thebase member 24. Aflat spring 113′ is integrally formed with thestem 109′ with afree end 127′ thereof abutting an upper surface of the retention memberrear portion 89. Thespring 113′ biases thefoot engagement section 107′ toward thefront portion 96. Alever arm 115′ is integrally molded with, or otherwise rigidly attached to thestem 109′ and extends outwardly and downwardly therefrom. Apin 155 projects from the outerfree end 157 of thelever arm 115′ and rides in aslot 159 of alocking plate 161. The lockingplate 161 is pivotally attached to thebase member 24 through apivot pin 163 and includes a hook-shapedlocking portion 165 with aninner hook surface 169. Thebase member 24 includes a cylindrical laterally extendingprotrusion 125′ which is located on theside wall 86. - In the normally upright position, as shown in FIG. 3B, the inner hook surface contacts an outer surface of the
protrusion 125′ to prevent relative rotation of the handle and foot member. When thefoot engagement portion 107′ is depressed, as shown in phantom line, thepin 155 rides in theslot 159 of thelocking plate 161 and forces the locking plate to pivot in a direction opposite to the pivoting direction of thefoot engagement portion 107′. The hook-shapedlocking portion 165 rotates away from theprotrusion 125′ until it is clear of the protrusion. In this position, thehandle 18 can be rotated with respect to thebase member 24. The locking plate then rotates to its original position under bias from thespring 113′. When the handle is rotated to the upright position, theinner surface 169 catches theprotrusion 125′ and forces the plate (and foot engagement portion) to rotate against the bias of thespring 113′ until theprotrusion 125′ is seated in the hook-shapedlocking portion 165. - FIG. 4 is a schematic representation of the cleaning solution distribution system for the preferred embodiment of the cleaning machine. Generally, clean water and detergent are drawn from the
respective tanks valve 110 through the operation of apump 112. Thepump 112 then conducts the pressurized cleaning solution to spraynozzles 114 provided on thebase assembly 14 or to thetrigger valve 108 of theaccessory hose 52 through an accessory hose solution tube mounting 116 provided on the front wall of theupper housing 16 and an accessoryhose tube connector 106 mounted on the end of thehose 52 opposite thecleaning tool 68. - Turning now to the specific structure of the cleaning solution distribution system, as seen in FIGS.4-6, both the
clean water tank 42 and thedetergent tank 44 include one-way valve mechanisms 122 on the bottom surfaces thereof which cooperate withtank seat assemblies 150 provided on the upper surface of theupper housing 16 to control the flow of fluid from the tank to the other components of the distribution system. The structure of the one-way valves 122 andtank seat assemblies 150 is identical, and therefore, only the structure of theclean tank valve 122 andseat assembly 150 will be described in detail. - The bottom wall of the
clean tank 42 has a downwardly extending threadedboss 118 with an aperture extending therethrough. A threadedcap 120 is rotatably received on theboss 118, and mounts a one-way valve member 122 enclosing the aperture of the boss. Thevalve member 122 comprises ahollow valve body 124 having a downwardly extendingconnector boss 126 with afluid flow aperture 128 extending therethrough. Aflexible rubber seal 130 fits around theboss 126 and is adapted to engage aninner surface 151 of thetank seat assembly 150 when the valve member is installed thereon. Agasket 132, a release rod orplunger 138 and acompression spring 136 are located within thevalve body 124 and held in position by aspring housing 134. A lower end of thespring housing 134 can be securely attached to the inside of the hollow valve body through ultrasonic welding, adhesives, or other well known means. Thespring housing 134 preferably has a plurality ofapertures 144 to permit the flow of fluid from the tank therethrough. Ascreen 146 is attached to anupper end 148 of thespring housing 134 to filter out large particles of foreign material that may be present in the fluid. Anouter shoulder 145 on the valve body receives anannular gasket 147 that seals around the lower edge of theboss 118 of each tank. - The
release rod 138 has anannular flange 140 that seats against thegasket 132 under a biasing force from thespring 136 to prevent the flow of fluid from the tank when it is separated from thetank seat assembly 150. Preferably, the bottom of the release rod 158 is flush with the bottom of theconnector boss 126, or slightly thereabove to prevent inadvertent valve opening when the tank is placed right side up on a surface. - The
tank seat assembly 150 comprises aseat member 152 having a substantiallycircular flange 154 extending upwardly and downwardly from abase plate 156. A central projection 158 extends upwardly from thebase plate 156, and a plurality offluid apertures 160 are formed in thebase plate 156 intermediate the central projection 158 and thecircular flange 154. Areservoir 162 is mounted to theseat member 152 beneath thefluid apertures 160, and a conventional hose mounting 164 extends outwardly from thereservoir 162. Aconventional hose 166 is mounted to the hose mounting 164 and fluidly connects the reservoir to the mixingvalve 1 10 which is then fluidly connected to thepump 112. - The preferred embodiment of the
seat assembly 150 also includes a one-way umbrella valve 167 to prevent the back flow of solution from thereservoir 162 past thebase plate 156, which may occur when the liquid level in one supply tank is higher than the liquid level in the other supply tank. The one-way valve comprises an elastomericumbrella valve member 168 having acentral stem 170 extending from one side thereof which is received in anappropriate aperture 172 of asupport disc 174. Thedisc 174 is supported in asuitable recess 176 provided in theseat member 152. Thedisc 174 has a plurality offlow apertures 178 provided therein, all of which are adapted to be covered by theumbrella valve 168. When either positive fluid pressure is exerted on to the top surface of theumbrella valve 168, or negative fluid pressure is created in thereservoir 162 positioned beneath thevalve member 168, then the outer radius of the body of theumbrella valve 168 will deflect downwardly to permit the flow of fluid from theseat member 152 to thereservoir 162. - As described further below, the tanks are received on the
handle 18 andupper housing 16 by vertical movement of thetank assembly 20 with respect to theupper housing 16. Eventually, the one-way valves 122 of the tanks will be telescopically received inside thetank seat assemblies 150 so that the central projection 158 extends upwardly through theboss 126 of the one-way valve a sufficient distance to dislodge therod 138 from theaperture 128, thereby permitting the flow of fluid through the one-way valve and into thetank seat assembly 150. When the tank is lifted vertically with respect to theupper housing 16, the central projection 158 will be telescopically removed from theaperture 128, and thespring 136 will bias therod 138 of the one-way valve back into sealing position to prevent the inadvertent flow of fluid through the one-way valve. - The
tank assembly 20 is configured for easy refilling of the tanks and securing the tanks to theupper housing 16 and handle 18. Theclean water tank 42 has an integrally molded carryinghandle 184 and acap 186 closing afill opening aperture 188 formed on the top wall of the tank. Aprotrusion 187 is integrally molded with the bottom of the clean water tank and fits within a corresponding depression (not shown) in theupper housing 16. The outer wall of the protrusion facilitates alignment of thetank assembly 20 with theupper housing 16. The inner volume of the protrusion can be filled with detergent that will be mixed in a predetermined ratio when thetank 42 is subsequently filled with water, in the event that thedetergent tank 44 and mixing valve are not used. Thecap 186 can be quickly and easily removed for filling thetank 42 with clean water. - As noted above, the clean water is discharged through the
boss 126 and one-way valve mechanism 122 provided on the bottom wall of theclean water tank 42. Avent opening 182 extends through the upper wall of thetank 42 to allow entry of air when water is removed from the tank from thevalve mechanism 122. If theplunger 138 becomes stuck during operation, thevent opening 182 prevents siphoning if liquid should leak past the plunger. - The
detergent tank 44 nests into arecess 190 accessible through thefront wall 192 of theclean water tank 42. Preferably, therecess 190 is formed in the front, bottom edge of the clean water tank and is defined by a pair ofopposed sidewalls 194, arear wall 196, and atop wall 198. A pair of substantiallyhorizontal projections 200 are provided on thesidewalls 194 of therecess 190. Theseprojections 200 are adapted to cooperate with a pair of substantiallycomplimentary grooves 202 formed in the sidewalls 204 of thedetergent tank 44 for mounting the tanks to one another. Thedetergent tank 44 is removed from theclean water tank 42 by sliding thedetergent tank 44 forward, parallel to the axis of theprojections 200 andgrooves 202, until thedetergent tank 44 is removed from therecess 190. - The
detergent tank 44 must be refilled by unscrewing thecap 120 of the one-way valve assembly and removing thevalve member 122 to permit refilling of thetank 44 through the boss aperture. Thedetergent tank 44 has an umbrella valve 203 (FIG. 5) that fits within a ventingaperture 205 on thetank 44 to prevent fluid leakage when the tank is inverted for refilling. Theumbrella valve 203 is preferably similar in construction to the one-way umbrella valve 167 in FIG. 6. Once thetank 44 has been refilled, the one-way valve member 122 andcap 120 are replaced, thetank 44 is inverted, and then slid into therecess 190 of theclean water tank 42. - As noted briefly above, the
tank assembly 20 is preferably slidably mounted to thehandle 18. The rear wall of theclean water tank 42 includes aU-shaped groove 210 which is substantially complementary to the front portion of thehandle 18. Thegroove 210 is defined by a pair ofopposed sidewalls 212 and afront wall 214. Thesidewalls 212 include a pair oflinear grooves 216 which are complementary to a pair oflinear projections 218 formed onsidewalls 220 of thehandle 18. Thehandle projections 218 extend only a portion of the length of thehandle 18. Thetank assembly 20 is slidably received on thehandle 18 by positioning thetank assembly 20 vertically above theupper housing 16 so that theprojections 218 andgrooves 216 are aligned with one another. Then thetank assembly 20 is lowered so that thetank assembly 20 is slidably received on thehandle 18 and thegrooves 216 receive theprojections 218. Thetank assembly 20 is fully received on thehandle 18 when the one-way valve assemblies of thetanks 20 engage theseat assemblies 150 provided on the top wall of theupper housing 16. Thetank seat assemblies 150 are not rigidly mounted horizontally in order to allow alignment of the two tank outlets, which would otherwise cause leaks. Once the tank assembly is in this position, thelatches 46 can then be pivoted onto theprojections 48 for locking thetank assembly 20 to thehandle 18 andupper housing 16. - Returning to the solution flow schematic diagram seen in FIG. 4, the mixing
valve 110 is positioned intermediate thetank seat assemblies 150 and thesolution pump 112. Preferably, the mixing valve is avariable mixing valve 110 to accommodate differing mixtures of detergent and clean water. As seen in FIGS. 4, 7, and 8, thevariable mixing valve 110 comprises avalve body 230 having aclean water inlet 232 which is fluidly connected to the clean watertank seat assembly 150 by thehose 166 and adetergent inlet 236 which is fluidly connected to the detergenttank seat assembly 150 by ahose 238. Asolution outlet 240 is also formed on thevalve body 230 and is adapted to conduct the clean water and detergent mixture from the mixingvalve 110 to thepump 112 through ahose 242. - The valve body is formed from an
end cap 244, acentral body portion 246, and anend inlet member 248 mounted to the end of thecentral body portion 246 opposite theend cap 244. Aplunger 250 extends through an aperture in theend cap 244 such that ashaft 251 of theplunger 250 is received inside thecentral body portion 246 and theend inlet member 248 and a portion of the shaft extends outwardly from theend cap 244. Acam follower 252 is formed at the outer end of theshaft 251 and is adapted to ride along a contouredcam surface 272 of acam 270, as seen in FIG. 7. A plunger head includes acollar 254 that is positioned along the length of the shaft of theplunger 250 and has anannular groove 256 formed therein that receives an O-ring 258. Thecollar 254 and O-ring 258 are adapted to create a fluid seal inside the circular valve body and in cooperation with the central body portion define amixing chamber 260 therein. An O-ring 262 is provided in thecentral body portion 246 immediately adjacent theend inlet member 248. The O-ring 262 cooperates with theplunger 250 to effectively seal theend inlet member 248 anddetergent inlet 236 from the mixingchamber 260, depending upon the axial position of theplunger 250 within thevalve body 230. - The
plunger 250 forms avalve stem 263 at one end with atapered groove 264 which extends along the surface of theplunger valve stem 250, preferably passing through the end wall of theplunger 250, and is tapered so that thegroove 264 has a greater cross-sectional area immediately adjacent the end than it does a spaced distance therefrom. Thevalve stem 263 is positioned in thedetergent inlet 236 opening to control the flow of detergent therethrough. The purpose of the taperedgroove 264 is to accommodate varying flow rates of detergent through the opening in thedetergent inlet 236 into the mixingchamber 260 of thevalve body 230. - A
control knob 266 is mounted on thefront wall 268 of theupper housing 16 for controlling the water/detergent ratio in the cleaning solution delivered to thepump 112. Thecam 270 is mounted to the rear surface of theknob 266, and thecam 270 is positioned so that the terminal end of theplunger 250 bears against the contouredsurface 272 of thecam 270. FIGS. 7 and 8 depict the two extreme ranges of solution mixtures in the preferred embodiment of the cleaningmachine 12. FIG. 7 shows theplunger 250 extended outwardly from thevalve body 230 the maximum distance. In this position, the maximum length of the taperedgroove 264 is extended into the mixingchamber 260 of the valve. Therefore, the maximum amount of detergent will be drawn into the mixingchamber 260 and ultimately discharged to thepump 112. - FIG. 8 depicts the other extreme position in which the
plunger 250 is positioned so that the entire length of the taperedgroove 264 is withdrawn from the mixingchamber 260 so that there is no fluid flow communication between thedetergent inlet 236 and the mixingchamber 260. Therefore, only clean water will be directed to thepump 112. As is evident, thecontoured surface 272 of thecam 270 permits an infinite number of detergent to water mixing ratios between the two extremes shown in FIGS. 7 and 8. In the preferred embodiment, theknob 266 andcam 270 are received in only one of three positions, the water only or “rinse” position as seen in FIG. 8, a maximum detergent to water mixing ratio as seen in FIG. 7, or a standard mixing ratio half-way between the extremes shown in FIGS. 7 and 8. In use, theknob 266 is intended to be positioned at the standard mixing ratio position for the vast majority of cleaning operations. When a high traffic or heavily stained area is encountered, theknob 266 can be rotated to the maximum detergent position as seen in FIG. 7. If a final clean water rinsing operation is desired, then theknob 266 can be rotated to the water only position as seen in FIG. 8. The incorporation of thevariable mixing valve 110 permits varying the water/detergent mixture ratios to accommodate a wide variety of cleaning situations. - With reference again to FIG. 4, and as noted above, the
pump 112 is positioned downstream from thevariable mixing valve 110. When thepump 112 is energized and primed, thepump 112 will draw fluid from the mixingvalve 110 andtank seat assemblies 150 at the prescribed ratio. Although different pump types can be used, thepump 112 preferably does not self-prime. Some means, therefore, should be incorporated to assist priming of thepump 112. The fluid flow system in FIG. 4 includes apump priming valve 280 which is preferably mounted vertically above thepump 112, thetank seat assemblies 150 in the base of thehandle 18, and the water level in thetank 42. Thepump priming valve 280 includes aninlet port 282 that is fluidly connected to the outlet of thepump 112 and afluid outlet port 284 that is fluidly connected to the impeller fan chamber of the vacuum motor 74 (FIG. 2), or a portion of the recovery tank that is exposed to vacuum pressure. Thepump priming valve 280 comprises a hollow valve body having aninner chamber 286. Preferably, asmall shoulder 292 with acentral aperture 294 is formed inside the valve body. An elongate plunger 290 having a conicalrubber sealing tip 296 is received for reciprocal movement inside the ball chamber. The primingvalve 280 may also include a vent aperture (not shown) to prevent potential siphoning. - In operation, the
pump 112 will be primed with the fluid from the solution tanks by turning thepump 112 on and thevacuum motor 74 on. Thevacuum motor 74 will exert negative pressure on the fluid outlet of thepump 112 through thepump priming valve 280 thereby drawing any air out of the pumping chamber (not shown) between the pump inlets and the solution tanks therethrough. The air will be drawn through thepump priming valve 280 into the vacuum impeller fan chamber or into therecovery tank 30. Preferably, the weight and dimensions of the plunger 290 is coordinated with the amount of negative air pressure applied to the pump priming system from the vacuum motor so that the negative air pressure applied to thefluid chamber 286 is insufficient, by itself, to draw the plunger 290 upwardly and seal the outlet of the pump priming valve. - As the
vacuum motor 74 operates to draw the air from the system, it is likely that some fluid will enter thepump priming valve 280. Preferably, the size of the elongatedfluid chamber 286 is dimensioned to accommodate a sufficient amount of fluid to permit full priming of thepump 112. Eventually, the fluid level will rise inside thepump priming valve 280 and fluid will enter theball chamber 286. The plunger 290 is preferably formed of a material and dimension such that the fluid alone does not cause the plunger to rise in the chamber. However, the combined pulling force from the negative air pressure and the pushing force from the rising liquid inside the chamber acting on the plunger causes the plunger to rise until the sealingtip 296 bears against theshoulder 292 and seals theaperture 294 to prevent solution from flowing therefrom. Once this seal has established, the pump should be sufficiently primed for normal operation. - Following the
pump priming valve 280, the pressurized solution is simultaneously directed to the accessory hose solution tube mounting 116 and aconventional trigger valve 300. As seen in FIGS. 4 and 5, thetrigger valve 300 is positioned in the base of thehandle 18 immediately below the bottom end of anactuator rod 302. Therod 302 extends upwardly to pivotally interconnect with thetrigger 60 provided in theclosed loop grip 58 of thehandle 18. In the preferred embodiments,multiple actuator rods 302 are interconnected to traverse the distance between thetrigger 60 and thetrigger valve 300. - Upon squeezing of the
trigger 60 relative to theclosed loop grip 58, theactuator rods 302 are displaced downwardly to squeeze theplunger 304 of theconventional trigger valve 300 and permit the flow of fluid therethrough. With thetrigger valve 300 in the open position, pressurized fluid flows through aconventional conduit 306 to a pair ofspray tips 114 mounted to thefoot member 24 immediately adjacent the agitation brush. Preferably, thespray tips 114 are adapted to create a fan-shaped spray pattern which traverses substantially the entire width of the agitation brush and suction nozzle opening. - Turning now to the fluid recovery system, the
vacuum motor 74 andimpeller fan 76 generate negative air pressure which is communicated from theupper housing 16 to thebase assembly 14 for recovery of used solution and dirt. As shown in FIGS. 9 and 10, the working air flow path for on-the-floor cleaning begins at thesuction nozzle opening 316 provided at the front, forward edge of thebase assembly 14. Preferably, the suction nozzle opening is defined by afront plate member 318 and arear plate member 320 which are mounted to one another and which also define the initial workingair flow conduit 322. Thesuction nozzle opening 316 extends the entire width of thebase assembly 14 and theplate members sidewalls 324 are integrally formed into the rear plate member to define the sides of the initial flow conduit. Preferably, thesidewalls 324 taper upwardly and inwardly (see FIG. 1). Theinitial flow conduit 322 terminates at anoutlet 326 positioned along the top edges of the plate members and sidewalls. In view of the fact that the sidewalls of the flow conduit taper upwardly and inwardly, the length of the outlet of the initial suction flow conduit is less than the length of the suction nozzle opening and the width of thebase assembly 14. Preferably, anelastomeric gasket 328 is mounted to the top edges of the front andrear plates outlet 326. - From the
initial flow conduit 322, the air/water/debris mixture flows intorecovery tank 30 which is an assembly of abottom member 308 and atop member 310 having atop wall 364, a pair ofsidewalls 366, and arear wall 368. The working air flows from theinitial flow conduit 322 to an intermediate workingair flow conduit 330 which is defined by adepression 332 formed in thetop wall 364 of therecovery tank 30 and acover plate 336 secured thereto. Thedepression 332 comprises abottom wall 338 and a pair ofopposed sidewalls 340. Preferably, thesidewalls 340 initially taper inwardly from theinlet 342 of the intermediate working air conduit a short distance and then ultimately extend parallel to one another approaching theoutlet 344 of the intermediate workingair conduit 330. Preferably, thecover plate 336 is formed of a transparent, plastic material, and thetop wall 364 andsidewalls 346 of therecovery tank 30 are formed of a smokey, translucent material. Utilizing these materials and the structure of theintermediate flow conduit 330, the user can easily observe the dirt and water passing up through theintermediate flow conduit 330 and also easily observe the fluid level inside therecovery tank 30. - The
outlet 344 of theintermediate flow conduit 330 is positioned immediately adjacent an air/water separator baffle 350 which is integrated into therecovery tank 30 and is formed by a downwardly extendingrear wall 352, a pair of parallel, downwardly extendingsidewalls 354, and abottom wall 356 extending forwardly from therear wall 352. A sealingpocket 429 is integrally formed along therear wall 352. With this structure, the working air flow enters the hollow interior of therecovery tank 30 and is immediately redirected approximately 180° to travel forwardly and downwardly into the tank interior away from thetank outlet 382. The water and dirt will enter the air/water separator baffle 350 and strike the various walls of thebaffle 350 and fall downwardly into the tank. - In addition to the redirection of the working air flow as it enters the
tank 30, the effective cross-sectional area of the working air conduit is dramatically increased as the air/water mixture passes from the intermediate working air conduit into the air/water separator baffle and the recovery tank. This sudden increase in cross-sectional area results in a significant drop in velocity for the working air, thereby assisting in the separation of dirt and water from the air. - A
fluid containment baffle 370 is mounted inside the hollow interior of therecovery tank 30 and is intended to prevent excessive sloshing of the recovered dirt and liquid and also contain any foam generated inside the tank. Thebaffle 370 comprises a front, downwardly extendingportion 372 and a rear downwardly extendingportion 374 which are spaced from one another but interconnected to one another bymultiple stringers 376. Thestringers 376 and edges of the front 372 andrear portions 374 definefluid apertures 378 therebetween. Preferably, thebaffle 370 is mounted to therear wall 368,sidewalls 366, andtop wall 364 of the top member 310 a spaced distance from thebottom member 308. Preferably, thefluid flow apertures 378 are positioned immediately below the air/water separator 350 so that as the dirt and water drop therefrom, they pass through theapertures 378 into the lowermost portion of therecovery tank 30. - The
front 372 and rear 374 portions of thebaffle 370 are contoured to prevent excessive sloshing of the recovered liquid during movement of the cleaner 12. For example, when the user is moving thebase assembly 14 forward and then reverses the direction and pulls thebase assembly 14 rearwardly, the water and dirt present within the tank will surge toward the front of therecovery tank 30. The water will strike the slopingtop wall 364 of therecovery tank 30 and be deflected rearwardly. Any water which may be deflected upwardly will strike the downwardly extendingfront portion 372 of thebaffle 370 and, therefore, be deflected downwardly to the lowermost portion of therecovery tank 30. The downwardly extendingrear portion 374 of thebaffle 370 will similarly deflect fluid downwardly. Thebaffle 370 serves to prevent excessive sloshing of fluid in the tank and also provides the added benefit of containing any foam which may build up in the tank beneath thebaffle 370 spaced away from the air/water separator baffle 350 and fluid outlet. - An air flow
outlet stand pipe 380 is integrally formed into thebottom member 308 and is provided at the rear of therecovery tank 30. The stand pipe extends upwardly to a point adjacent the uppermost portion of therecovery tank 30, opposite the outlet of the air/water separator baffle 350. In addition, aninlet opening 382 of thestand pipe 380 is positioned vertically above thebaffle 370. With this structure, the substantially dry air exiting the air/water separator 350 will pass around the bottom 356 andsidewalls 354 of the air/water separator 350 and through the inlet opening 382 of thestand pipe 380 whereas the dirt and water will fall through thebaffle apertures 378 into the lowermost portion of therecovery tank 30. - A
manifold chamber 384 is formed at the bottom of thestand pipe 380 and defined by thebottom member 308 and thefoot member 24. Preferably, anelastomeric gasket 388 is mounted to the top of themanifold chamber 384 to create a substantially air-tight seal between the bottom of thestand pipe 380 and themanifold chamber 384. Themanifold chamber 384 is shown integrally molded to thebase member 24. Preferably however, themanifold chamber 384 is formed separately from thebase member 24 and includes downwardly extending hooks (not shown) that engage with cantilevered arms (not shown) on thebase member 24. The hooks are shaped to contact an upper surface of the arms and flex the arms downwardly when themanifold chamber 384 is installed. A locking surface (not shown) on the hooks then engages a lower surface of the arms to lock themanifold chamber 384 to thebase member 24. Aflexible conduit hose 386 extends from one end of the manifold to the impeller fan chamber mounted in the lower portion of theupper housing 16. In view of the fact that theupper housing 16 pivots with respect to thefoot member 24 andrecovery tank 30, theconduit 386 is preferably formed of a pliable, yet durable material. - A
float 390 is provided inside therecovery tank 30 to prevent overfilling of therecovery tank 30 with fluid. Thefloat 390 comprises abuoyant base 392 and aclosure plate 394 interconnected to one another by asupport plate 396. Theclosure plate 394 is dimensioned to fully seal the inlet opening 382 of thestand pipe 380 and prevent the flow of air or liquid therethrough. - The
float 390 is limited primarily to vertical movement with respect to therecovery tank 30, with the closure plate positioned above thefluid containment baffle 370 and thebuoyant base 392 positioned below thefluid containment baffle 370. Thefluid containment baffle 370 also includes anaperture 398 through which the stand pipe 3 80 extends. In addition, anarrow slot 400 is also provided in therear portion 374 of thefluid containment baffle 370 through which thesupport plate 396 of thefloat 390 extends. In the assembled position, theclosure plate 394 is positioned above thefluid containment baffle 370 and thebuoyant base 392 is positioned below thebaffle 370. - Movement of the float is constrained because the buoyant base is captured in a float cage defined by the
front wall 402 of thestand pipe 380, a pair of L-shapedwalls 404, 406 (FIG. 10) extending up from thebottom member 308, a substantiallyplanar wall 408 extending upwardly from thebottom member 308 intermediate the two L-shapedwall members rear portion 374 of thefluid containment baffle 370.Multiple slots 412 or fluid flow apertures are provided between thewall members stand pipe 380 so that fluid will quickly and easily flow into the float cage defined by these elements. As the fluid within the tank and the float cage rises, thefloat 390 will also rise until eventually, theclosure plate 394 nears the inlet opening 382 of thestand pipe 380. The closure plate 391 is sufficiently drawn against thestand pipe opening 394 by the suction from thevacuum motor 74 to close the air flow therethrough as illustrated by the phantom lines in FIG. 9. Once this happens, the pitch of the operatingvacuum motor 74 is sufficient to warn the user that therecovery tank 30 is full and must be emptied. - The
cover plate 336 has a triangular-shaped accessoryhose flow aperture 422 and alock aperture 428. Acover closure cap 420 has aspring arm 446 with abarb 448 which seats beneath the wall of thecover plate 336 at thelock aperture 428 when thecover cap 420 is seated over theaperture 428. A pair of retainingprojections 423 extend rearwardly from a front edge of theaperture 422 intorecesses 425 in a dependingflange 421 of thecover cap 420 when thecover cap 420 is seated over theaperture 428. Thecap 420 can thus pivot about theprojections 423 as the cap is fastened over and removed from theaperture 422. - The
recovery tank 30 is quickly and easily emptied by first tilting thehandle 18 andupper housing 16 rearwardly. Then, thelatches 32 are disengaged from theprojections 34 on therecovery tank 30. The user grasps thehandle 36 and merely lifts thetank 30 from thefoot member 24 and transports it to an appropriate site for emptying thetank 30. Thetank 30 can also be removed from thefoot member 24 without tilting thehandle 18 andupper housing 16. In any event thetank 30 can then be emptied by removing acap 414 mounted to thedrainage aperture 416 provided on therear wall 368 of thetank 30. Once thetank 30 has been emptied, thecap 414 is replaced, thetank 30 is lowered down onto thefoot member 24, and finally, thelatches 32 are snapped over theprojections 34 to lock the tank to thebase assembly 14. - As seen in FIG. 2, the entirety of the
accessory hose 52 is contained on the accessoryhose storage rack 50 when the cleaningmachine 12 is used for on-the-floor cleaning or when the machine is being stored. When it is desired to use theaccessory hose 52, the user unsnaps thegrip tube 64 from the C-shapedclip 66 of thehose rack 50 and unwinds the hose therefrom and then removes the accessoryhose mounting member 62 from its corresponding C-shaped clip on thestorage rack 50. Next, the user removes the cap 420 (FIG. 10) from the recoverytank cover plate 336, exposing the accessoryhose flow aperture 422 and inserts the accessoryhose mounting member 62 therein. The mountingmember 62 comprises an elbow-shapedrigid conduit 424 which receives the flexible hose on one end thereof and a triangular shaped mountingplate 426 on the other end thereof. - As seen in FIGS. 11 and 12, the accessory
hose flow aperture 422 is preferably formed directly above the air/water separator baffle 350 when thecover plate 336 is mounted to thetop member 310 of therecovery tank 30. Thelock aperture 428 is also formed in thecover plate 336, directly adjacent the accessoryhose flow aperture 422. The accessoryhose mounting member 62 comprises aflange 430 which extends downwardly from thetriangular support plate 426. Theflange 430 is substantially complementary to the inside edge of theaperture 422 and is adapted to be snugly received therein. Abaffle wall 432 extends downwardly along the front edge of thetriangular flange 422 and has a recess 432 a which receive theprojections 423. Thebaffle 432 extends substantially the entire width of the intermediate workingair conduit 330 and extends downwardly a sufficient distance to contact thebottom wall 338 of the conduit to thereby effectively seal theintermediate flow conduit 330 from the air/water separator baffle 350 and thevacuum motor 74. Therefore, substantially all of the working air drawn into therecovery tank 30 comes from theaccessory hose 52 when theaccessory hose 52 is mounted to the base as illustrated in FIG. 12. - The accessory
hose mounting member 62 is retained in theaperture 422 by aU-shaped spring arm 434 which is received in thelock aperture 428 and a sealingpocket 429 located immediately below theaperture 428. The sealingpocket 429 is integrally formed with therear wall 352 of thebaffle 350 and includes afront wall 431 and a pair ofside walls 433 extending between thefront wall 431 and the bafflerear wall 352. Thespring arm 434 comprises a pair ofopposed legs leg 436 extends downwardly from the triangular-shaped support plate. A lockingbarb 440 is provided on the outside edge of thefree leg 438 and aprojection 442 is provided at the terminal end of thefree leg 438. In use, the bight portion of theU-shaped arm 434 is initially inserted into thelock aperture 428. As thespring arm 434 is received in theaperture 428 and sealingpocket 429, the lockingbarb 440 bears against one edge of theaperture 428, thereby flexing thefree leg 438 inwardly toward theother leg 436. Eventually, the lockingbarb 440 will drop below the inside edge of thecover plate 336 at theaperture 428 and the resilientU-shaped spring arm 434 will spring outwardly to seat the barb beneath thecover plate 336 edge. The edge of thecover plate 336 at theaperture 428 will be captured between theouter projection 442 and the lockingbarb 440 of thespring arm 434. - When the user desires to remove the accessory
hose mounting member 62 from theaperture 422, the user squeezes thefree leg 438 toward the inner leg 436 a sufficient distance to bring the lockingprojection 440 out of contact with the aperture edge. Then, the user lifts the mounting member 62 a sufficient distance to withdraw thespring arm 434, triangular-shapedflange 430 and baffle 432 from theaperture 422. Finally, the user repositions thecap 420 in theaperture 422 thereby effectively sealing theaperture 422. - As seen in FIGS. 9 and 10, the structure of the
cap 420 is quite similar to the accessoryhose mounting member 62 in that it includes anidentical spring arm 446 and a substantially complimentary triangular flange extending downwardly therefrom. One key distinction is that thecap 420 does not include the downwardly extending baffle wall which seals the intermediate workingair flow path 330. - The preferred embodiment of the cleaning
machine 12 includes a rotatively mounted agitation brush which is adapted for easy and instantaneous vertical adjustment. As seen in FIGS. 9 and 13, the agitation brush assembly comprises abrush dowel 450 fixedly mounted on ashaft 452. The ends of theshaft 452 are received inbearings 454 which in turn are press-fit into inwardly extendingbosses 456 provided on a pair of opposed articulatingarm members 458. Alternatively, stub shafts (not shown) can extend from thearm members 458 and theshaft 452 can be replaced with bearings similar to 454 for rotational installation of thedowel 450 on thearm members 458. Eacharm member 458 comprises aback plate 460 with apivot pin 462 provided at the rear of theplate 460 and alimit arm 464 provided at the front of theplate 460. In addition, a laterally extendingbelt guard 466 is preferably integrally formed with the articulatingarm 458. Thebelt guard 466 extends laterally inwardly enough to cover thedrive belt 468 in the assembled position. Thebelt guard 466 protects thebelt 468 from threads and other foreign material becoming lodged therein and also protects the carpet or other surface positioned below thebase assembly 14 from therotating belt 468. Thedrive belt 468 extends around apulley 470 mounted at one end of thebrush dowel 450 and a drive shaft andpulley 472 of thebrush motor 474. - The pivot pins462 of the
arm member 458 are captured between abearing surface 476 integrally formed into the bottom of thefoot member 24 and a retainingmember 478 having a bearingsurface 480 formed thereon. Thepivot pin 462 is captured between the bearingsurfaces member 478 and thefoot member 24. The retainingmember 478 is secured to thefoot member 24 by a conventional fastener, such as ascrew 482. - The
limit arms 464 provided at the front of the retainingmembers 478 are preferably integrally molded with the retaining members and are adapted to limit the downward movement of the brush assembly relative to thefoot member 24. Eachlimit arm 464 has a forwardly extendingbarb 484 provided at the terminal end of thearm 464. In the operative position, thebarb 484 is positioned above a rearwardly extending projection 486 provided on thefoot member 24. As seen in FIG. 9, as the agitation brush assembly extends further and further downward, thebarb 484 on the end of thelimit arm 464 will contact the projection 486 and prevent any further downward movement. With this floating agitation brush assembly, the cleaningmachine 12 according to the invention can almost instantaneously adapt to varying carpet naps or other inconsistencies on the surface being cleaned. The brush arms also allow the rotating brush to drop below the normal floor plane to provide contact with the floor when a bare floor cleaning attachment raises the suction nozzle opening height from the floor. - As an alternative to the floating, rotatably mounted agitation brush as seen in FIGS. 9 and 13, a floating
strip agitation brush 490 could be incorporated in the cleaningmachine 12, as seen in FIG. 14. The floatingstrip agitation brush 490 is easily adapted for incorporation into the cleaningmachine 12. In this embodiment, thestrip brush 490 comprises alinear brush body 492 withbristles 494 extending downwardly therefrom and a pair of integrally moldedarms 496. Each of thearms 496 is formed by a pair ofopposed plates pivot pin 502 extending between the rear most edge of theopposed plates foot member 24 in the same manner as the pivot pins 462 shown previously in FIG. 13. Namely, the pivot pins 502 are captured between thebearing surface 476 of thefoot member 24 and thebearing surface 480 formed on theretention member 478 which is securely fastened to thefoot member 24 byconventional fasteners 482. With this structure, thestrip brush 490 can move vertically in response to changes in the carpet nap or other inconsistencies in the surface being cleaned. - As described above with respect to FIG. 1, the accessory hose solution tube mounting116 is used primarily for connecting an accessory nozzle, such as found in the
upholstery tool 68 in order to provide cleaning solution to the surface being cleaned. It is contemplated, however, that an elongate spray wand can be provided as an accessory attachment for the solution tube mounting 116. Thedetergent tank 44 could hold an insecticide solution that is mixed with water or other liquid from theclean water tank 42 in an adjustable ratio for the treatment of fleas or ticks, as an example. In use, thevacuum motor 74 and thebrush motor 474 would be turned off, with thesolution pump 112 turned on to deliver the insecticide solution to a surface. Alternatively, theclean water tank 42 could hold the insecticide solution or some other solution that is to be directly applied to a surface. - The water extraction cleaning machine according to the invention overcomes several of the problems of the prior art. Namely, the cleaning machine is easily adapted for a variety of cleaning operations. For example, the detergent to water mixture ratio can be altered nearly instantaneously. In addition, the height of the agitation brush with respect to the suction nozzle opening changes immediately in response to changes in the carpet nap and other inconsistencies in the surface being cleaned. The cleaning machine according the invention also provides easy and convenient means for filling and emptying the clean water and detergent tanks. Similarly, the recovery tank can be quickly and easily removed for emptying or cleaning. Finally, the accessory hose intended for use with the cleaning machine according to the invention is preferably stored on the machine at all times when not in use. This minimizes the storage space required for the machine and accessories and simultaneously ensures that the user has all attachments and accessories contained on the machine, regardless of where the machine is being used.
- Reasonable variation and modification are possible within the spirit of the foregoing specification and drawings without departing from the scope of the invention.
Claims (51)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US09/753,368 US6279196B2 (en) | 1995-11-06 | 2001-01-02 | Upright water extraction cleaning machine |
Applications Claiming Priority (8)
Application Number | Priority Date | Filing Date | Title |
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US728995P | 1995-11-06 | 1995-11-06 | |
US666595P | 1995-11-13 | 1995-11-13 | |
US1717596P | 1996-05-09 | 1996-05-09 | |
US2698896P | 1996-09-20 | 1996-09-20 | |
US08/741,746 US5896617A (en) | 1995-11-06 | 1996-11-05 | Water extraction cleaning machine with nesting tank assembly |
US09/009,155 US6041472A (en) | 1995-11-06 | 1998-01-20 | Upright water extraction cleaning machine |
US09/408,997 US6192549B1 (en) | 1995-11-06 | 1999-09-29 | Upright water extraction cleaning machine |
US09/753,368 US6279196B2 (en) | 1995-11-06 | 2001-01-02 | Upright water extraction cleaning machine |
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US09/408,997 Continuation US6192549B1 (en) | 1995-11-06 | 1999-09-29 | Upright water extraction cleaning machine |
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US09/408,997 Expired - Lifetime US6192549B1 (en) | 1995-11-06 | 1999-09-29 | Upright water extraction cleaning machine |
US09/753,368 Expired - Lifetime US6279196B2 (en) | 1995-11-06 | 2001-01-02 | Upright water extraction cleaning machine |
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US09/408,997 Expired - Lifetime US6192549B1 (en) | 1995-11-06 | 1999-09-29 | Upright water extraction cleaning machine |
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Also Published As
Publication number | Publication date |
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US6134744A (en) | 2000-10-24 |
US6279196B2 (en) | 2001-08-28 |
US6192549B1 (en) | 2001-02-27 |
US6041472A (en) | 2000-03-28 |
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