US20050155972A1 - Container and cap assembly for pressure washer - Google Patents
Container and cap assembly for pressure washer Download PDFInfo
- Publication number
- US20050155972A1 US20050155972A1 US10/750,117 US75011703A US2005155972A1 US 20050155972 A1 US20050155972 A1 US 20050155972A1 US 75011703 A US75011703 A US 75011703A US 2005155972 A1 US2005155972 A1 US 2005155972A1
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- US
- United States
- Prior art keywords
- opening
- container
- cap
- cap member
- assembly
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
- B08B3/026—Cleaning by making use of hand-held spray guns; Fluid preparations therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/12—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means capable of producing different kinds of discharge, e.g. either jet or spray
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/24—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
- B05B7/2402—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device
- B05B7/2405—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using an atomising fluid as carrying fluid for feeding, e.g. by suction or pressure, a carried liquid from the container to the nozzle
- B05B7/2408—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using an atomising fluid as carrying fluid for feeding, e.g. by suction or pressure, a carried liquid from the container to the nozzle characterised by the container or its attachment means to the spray apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/24—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
- B05B7/2402—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device
- B05B7/244—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using carrying liquid for feeding, e.g. by suction, pressure or dissolution, a carried liquid from the container to the nozzle
- B05B7/2443—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using carrying liquid for feeding, e.g. by suction, pressure or dissolution, a carried liquid from the container to the nozzle the carried liquid and the main stream of carrying liquid being brought together downstream of the container before discharge
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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
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
- B05B1/16—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening having selectively- effective outlets
Definitions
- the claimed invention relates to a pressure washer that is configured to spray soap at both a high and a low pressure.
- the pressure washer includes a spray lance and an injector and a chemical tank is attached to the spray lance.
- the tank is operable in both an upright and an inverted position.
- the injector includes a metallic nozzle and a plastic aspirator.
- a pressure washer is a device that includes a pump, a hose, and a spray lance having an injector.
- a fluid source such as water
- a fluid source is connected to the pump and fluid is pumped through the hose and out the injector for application to a surface.
- a chemical such as detergent
- Surfaces that are typically treated with a pressure washer may be at ground level or higher. It is not uncommon for a pressure washer to be used to spray a multi-story building, such as a three story house, or a single level structure, such as a deck or porch.
- Typical pressure washers spray soap at either a low pressure or a high pressure.
- a user will typically use low pressure spray to reach easy to reach areas and high pressure spray to reach hard to reach areas, such as the second story of a home or office building.
- low pressure soap sprayers soap can be applied to the first story of a house, but not to higher stories. In order to reach higher stories, it is necessary to use a ladder in conjunction with the spray lance, while the pump and soap container remains on the ground.
- high pressure soap sprayers soap can be applied to the upper stories of a house, but not at lower stories because the high pressure of the sprayer may result in damage to the facade of the house.
- High pressure applicators can be used on lower stories only if the user backs a far enough distance away from the structure, in order to avoid damaging the facade.
- Venturis are well known for introducing a second fluid into a first fluid.
- the second fluid is introduced through an aspirator inlet that is typically aligned with a narrowed portion of the venturi, or positioned downstream of the venturi.
- the second fluid to be introduced is sucked into the venturi through the aspirator inlet as fluid flows through the venturi tube.
- the aspiration rate depends on the flow rate of the fluid which passes through the venturi inlet and the viscosity of the fluids.
- a container for coupling to a spray lance includes a hollow member having at least one opening and at least one attachment mechanism for attaching the hollow member to a spray lance of a pressure washer.
- the hollow member is configured to house a chemical.
- a container for coupling to a spray lance includes a hollow member and a cap assembly.
- the hollow member has at least one opening and at least one attachment mechanism for attaching the hollow member to a spray lance.
- the hollow member is configured to house a chemical.
- the cap assembly has an inner cap member with a first and a second opening and an outer cap member with a third opening.
- the outer cap member is movable relative to the inner cap member such that the third opening aligns with the first opening when the cap is in a first operative position, the third opening aligns with the second opening when the cap is in a second operative position, and the third opening aligns with neither the first nor the second opening when the cap is in a third inoperative position.
- a cap assembly for a container that is usable in both an upright and an inverted position.
- the cap assembly includes an inner cap member and an outer cap member.
- the inner cap member has a first and a second opening.
- the outer cap member has a third opening and is positioned adjacent the inner cap member.
- the outer cap member is rotatable relative to the inner cap member into at least three operative positions, such that the third opening aligns with the first opening when the cap is in a first operative position, the third opening aligns with the second opening when the cap is in a second operative position, and the third opening aligns with neither the first nor the second opening when the cap is in a third inoperative position.
- FIG. 1 is a view of a pressure washer according to the invention
- FIG. 2 is partial view of the pump and first chemical inlet of the pressure washer
- FIG. 3 is a partial view of the pump showing the first chemical inlet in greater detail
- FIG. 4 is a perspective view of the spray lance and injector according to the invention incorporating a chemical tank attached to the spray lance;
- FIG. 5 is a perspective view of the chemical tank shown in FIG. 4 ;
- FIG. 6 is an end view of the chemical tank of FIG. 5 ;
- FIG. 7 is a top view of the spray lance and injector according to the invention.
- FIG. 8 is a side view of the spray lance and injector of FIG. 6 ;
- FIG. 9 is a bottom view of the spray lance and injector of FIG. 6 ;
- FIG. 10 is a cross-sectional view of the cover of the injector shown in FIG. 6 ;
- FIG. 11 is an end view of the cover shown in FIG. 9 ;
- FIG. 12 is a cross-sectional view of injector body of the injector shown in FIG. 6 ;
- FIG. 13 is a partial top view of the injector shown in FIG. 6 ;
- FIG. 14 is a partial bottom view of the injector shown in FIG. 6 ;
- FIG. 15 is a cross-sectional view of the injector shown in FIG. 6 in a high pressure spray mode
- FIG. 16 is a cross-sectional view of the injector of FIG. 15 , but in a low pressure spray mode;
- FIG. 17 is a cross-sectional view of the cap assembly according to the invention.
- FIG. 18 is a perspective bottom view of the outer cap member of the cap assembly shown in FIG. 17 ;
- FIG. 19 is a perspective top view of the outer cap member of FIG. 18 ;
- FIG. 20 is a cross-sectional view of the outer cap member shown in FIG. 19 , taken along line 20 - 20 ;
- FIG. 21 is a perspective top view of the inner cap member of the cap assembly shown in FIG. 17 ;
- FIG. 22 is a perspective bottom view of the inner cap member of FIG. 21 ;
- FIG. 23 is a top view of the inner cap member shown in FIG. 21 ;
- FIG. 24 is a cross-sectional view of the inner cap member of FIG. 23 , taken along line 24 - 24 ;
- FIG. 25 is a partial perspective view of the cap assembly installed on the chemical tank.
- FIG. 26 is an exploded view of the locking mechanism for the cap assembly.
- FIG. 1 shows a pressure washer 10 according to the invention and FIGS. 2-3 show several exploded views of the pressure washer 10 of FIG. 1 .
- the pressure washer 10 includes a pump 12 for pumping a fluid from a fluid source (not shown).
- the pump 12 includes an inlet 14 for receiving a fluid from the fluid source and an outlet 16 for pumping the fluid at a pressure.
- the pump 12 is operated by a motor 18 , which may be powered by gas, electric, or another energy source.
- the pump 12 and motor 18 are preferably positioned on a support structure 20 , such as the cart shown, so that they may be easily maneuvered around a job site.
- a hose 22 is connected to an outlet 16 of the pump 12 and a spray gun 24 , a spray lance 26 , and an injector 28 are connected to the hose 22 for spraying a fluid that is received under pressure from the pump 12 .
- the spray gun 24 includes a handle 30 and a trigger 32 for opening the spray lance 26 to receive fluid from the pump 12 . The operator pulls the trigger 32 in order to open flow of a fluid from the pump 12 .
- the pressure washer 10 is configured to spray a fluid out of the injector 28 at a pressure range that ranges from a low pressure to a high pressure. In a preferred embodiment, the pressure washer 10 is configured to spray at a low pressure range of about 25 to about 200 psi and at a high pressure range of about 500 to about 3200 psi.
- a first chemical tank 34 is positioned on the cart 20 and includes a conduit or tube 36 , shown best in FIG. 2 , that extends from the first chemical tank 34 to a first chemical inlet 38 of the pump 12 , shown best in FIG. 3 .
- the first chemical tank 34 is preferably made of a non-corrosive plastic material and is utilized for storing chemicals, such as detergent, among other chemical substances.
- the first chemical tank 34 is made of a thermoplastic material, such as high density polyethylene. Other types of impact resistant, non-corrosive materials may also be used for the tank.
- the first chemical tank 34 is provided in order to introduce a first chemical into the fluid. When the first chemical is introduced into the fluid, the fluid combined with the first chemical travels through the hose 22 to the spray lance 26 and is sprayed onto a surface through the injector 28 .
- the pump 12 includes a venturi (not shown) that is positioned in the fluid line in alignment with the first chemical inlet 38 .
- Venturis are well known in the art for introducing a second fluid into a first fluid.
- the venturi is utilized to create a vacuum in the vicinity of the venturi and this vacuum serves to suction the first chemical from the first chemical tank 34 into the fluid.
- Venturis typically have an aspiration rate that is dependent upon the flow rate of the fluid that flows through the venturi tube.
- the pump venturi is designed to suction a first chemical when the pump 12 is operating in the low pressure spray range, described above.
- the pump 12 is configured to pump either a fluid from the fluid source, or a combination of the fluid from the fluid source combined with a first chemical from the first chemical tank 34 .
- a valve may be positioned between the first chemical tank 34 and the first chemical inlet 38 for opening and closing the flow of the first chemical from the tank.
- the operator in order to allow the first chemical to flow, the operator must open the valve between the first chemical tank 34 and the first chemical inlet 38 .
- the pressure washer 10 also utilizes a second chemical tank 44 , shown in FIGS. 1 and 4 - 6 .
- the second chemical tank 44 is utilized to spray a second chemical, which may be the same as or different from the first chemical.
- the second chemical tank 44 is preferably made of a non-corrosive plastic material and is utilized for storing chemicals, such as bleach or detergent, among other chemical substances.
- the second chemical tank 44 is made of a thermoplastic material, such as high density polyethylene. Other types of impact resistant, non-corrosive materials may also be used for the second chemical tank 44 .
- the second chemical tank 44 is preferably an elongated, tube-shaped, hollow container 46 that has an opening 48 at one end. The opening 48 is closed by a cap assembly 50 , which will be described in greater detail below.
- the second chemical tank 44 is provided in order to introduce a second chemical into the fluid as the fluid travels through the injector 28 . When the second chemical is introduced into the fluid, the fluid combined with the second chemical is sprayed through the exit 52 of the injector 28 .
- the container 46 includes an attachment mechanism 54 .
- the attachment mechanism 54 includes three clips 56 that are positioned in alignment on one side of the container 46 .
- the clips 56 are configured so that a first and a second clip 56 face a third clip 56 and such that the three clips together snap on and firmly engage a spray lance 26 .
- the spray lance 26 is an elongated tube, which may be made of steel or another rigid material.
- the clips 56 have a cross-section, shown in FIG. 6 , such that they firmly grip the elongated tube of the spray lance 26 .
- the clips 56 each may have the same cross-section, but with the middle clip being a mirror image of the end clips.
- the clips 56 may have different cross-sections.
- the middle clip has a different cross-section than the end clips in order to allow ease in attaching the container 46 to the spray lance 26 .
- the clips 56 are configured so that the container 46 is immovable relative to the lance 26 and integral with the lance 26 when the container 46 is clipped to the lance 26 . When the user moves the lance 26 , the container 46 moves with the lance.
- the container 46 may have any desired length. As shown in FIG. 1 , the container 46 may have a length that is less than the length of the spray lance 26 , or may have a length, as shown in FIG. 4 , that exceeds the length of the lance.
- the attachment mechanism 54 is designed so that the container 46 may be removed from or replaced onto the spray lance 26 , when desired. Other forms of the attachment mechanism may alternatively be used, such as other clip or snap-on designs, or designs that utilize screws, clamps or bolts, among other designs. Alternatively, other attachment mechanisms may be utilized to connect the container 46 at other points on the spray gun 24 .
- a stand alone tank (not shown) that sits on the ground may be used, if desired, as long as a conduit or hose extends from the tank to the injector 28 to allow the suctioning of the second chemical into the fluid.
- a container 46 that is attached to the spray lance 26 is preferred and desirable because it allows for portability of the unit and does not require the user to lug around an additional hose.
- the container 46 holds 1 / 2 gallon of chemical.
- Other shapes and sizes of container 46 may also be utilized, the invention not being limited to the shape and size of container 46 shown.
- the container 46 may include advertising indicia 58 , if so desired.
- operating instructions 60 may be positioned on the tank for assisting the operator in using the container 46 or the cap assembly 50 .
- the pressure washer 10 has three operative modes.
- the first mode includes low pressure spray of fluid combined with the first chemical.
- the second mode include high pressure spray of fluid without chemical and the third mode includes high pressure spray of the fluid combined with the second chemical.
- the pressure washer has four operative modes that include the first, second and third modes and an additional fourth mode.
- the fourth mode includes low pressure spray of the fluid without the first chemical.
- the injector 28 and spray lance 26 are shown in FIGS. 7-16 in various orientations.
- the spray lance 26 is attached to the injector 28 in a conventional manner, such as with screw threads 62 .
- the spray lance 26 is connected to the spray gun 24 , at the other end, utilizing screw threads 63 or other attachment mechanisms known to those of skill in the art.
- the injector 28 have a movable external member 64 that can move axially as well as rotationally.
- FIGS. 7 and 13 show a top view of the injector 28 and operational indicia 66 that may be included on the injector 28 . In this view, the user is prompted to vary the flow from high to low pressure by moving the external member 64 forward or rearward.
- FIG. 8 shows a side view of the injector 28 , showing the second chemical inlet 68 to the injector 28 .
- FIGS. 9 and 14 show a bottom view of the injector 28 , with instructions 66 on how to vary the spray pattern of flow coming from the injector 28 by rotating the external member 64 .
- the user rotates the injector 28 clockwise to emit a fan-like spray pattern and the user rotates the injector 28 counter clockwise to emit a stream of fluid.
- Various positions between the two extremes of a fan and a stream are provided by rotating the external member 64 a partial turn.
- Other types of spray patterns may also be provided in addition to or instead of the described spray patterns.
- the injector 28 includes an external member 64 and a nozzle 70 .
- the external member 64 includes a cover 72 and an injector body 74 .
- the injector body 74 extends inside of the cover 72 and includes the second chemical inlet 68 and the venturi 82 .
- the cover 72 and injector body 74 are positioned adjacent one another and are axially movable relative to the nozzle 70 .
- Axial movement of the external member 64 allows the user to alter the pressure of the fluid being discharged from the injector 28 between a low pressure and a high pressure.
- FIG. 13 shows indicia 66 on the outer surface of the cover 72 that describes the position of the cover 72 in order to obtain low and high pressure spray.
- the cover 72 is also rotatable relative to the injector body 74 to change the spray pattern. As shown in FIG. 14 , the cover 72 includes indicia 66 on an outer surface that describes the position of the cover 72 in order to alter the spray pattern from a fan to a jet.
- the injector body 74 includes an internal passageway 76 in which the nozzle 70 seats and fluid flows.
- the venturi 82 is defined in the internal passageway 76 .
- the injector body 74 may include spray arms 78 .
- the spray arms may be formed integral with the injector body, or may be formed as separate flow directing members.
- a spray deflecting member 79 may be seated inside the spray arms 78 and extends longitudinally toward the injector outlet 52 . When the cover 72 is rotated, the spray arms 78 or spray deflecting members 79 move against surfaces defined on the interior of the cover 72 in order to deflect the spray deflecting member 79 to provide the desired spray pattern from the injector 28 .
- the nozzle 70 is positioned inside the injector body 74 and includes a longitudinal internal passageway 80 that aligns with the internal passageway 76 of the injector body 74 .
- the nozzle 70 is shown as including two parts: 1) a nozzle body 71 and 2) a nozzle tip 73 .
- the nozzle tip 73 may be screwed into the nozzle body 71 , or otherwise connected to the nozzle body 71 .
- the nozzle tip 73 can be integrally formed with the nozzle body 71 so that they together are formed as a single piece.
- the nozzle tip 73 includes a flow restricting portion for restricting the flow through the nozzle 70 .
- the nozzle 70 also includes an external passageway 84 that travels around the nozzle 70 through a hole 86 that is positioned in the internal passageway 80 of the nozzle 70 .
- the hole 86 in the nozzle 70 allows fluid to travel from the internal passageway 80 to the external passageway 84 around the side and front of the nozzle 70 .
- the fluid flows around the nozzle 70 and then joins with fluid that travels through the internal passageway 80 to the internal passageway 76 of the injector body 74 .
- the external passageway 84 is bounded by a collar 88 that is positioned around the nozzle 70 and is movable with the injector body 74 .
- O-rings seals 90 are positioned between the collar 88 and the nozzle 70 . The O-rings 90 are used to close the external passageway 84 when the collar 88 is in a first rearward position and to allow flow to travel through the external passageway 84 when the collar 88 is in a second forward position.
- FIG. 15 shows the injector 28 in a high pressure spray position, where fluid only flows through the internal passageway 80 of the nozzle 70 and the nozzle tip 73 .
- the collar 88 is positioned so that the O-rings 90 close the external passageway 84 .
- the fluid exits through the nozzle tip 73 and passes through the venturi 82 defined in the internal passageway 76 of the injector body 74 .
- the fluid passes through the venturi 82 at a pressure that creates a vacuum downstream of the nozzle 70 and allows suctioning of the second chemical from the second chemical tank 44 through the second chemical inlet 68 , which is positioned downstream from the nozzle 70 in the injector body 74 .
- FIG. 16 shows the injector 28 in a low pressure spray position, where fluid flows both through the internal passageway 80 and through the external passageway 84 around the nozzle 70 .
- the collar 88 is positioned at a forward position so that the external passageway 84 is open. Flow enters the hole 86 in the nozzle 70 and exits around the nozzle 70 , through the external passageway 84 until it joins with the internal passageway 76 of the injector body 74 .
- This forward position of the collar 88 and injector body 74 represents the low pressure flow position, and chemical from the second chemical inlet 68 will not be introduced into the fluid because the vacuum required to suction the second chemical from the second chemical tank 44 is not present.
- the injector 28 preferably includes a combination of metallic and non-metallic materials designed to deter corrosion of the metallic parts.
- the nozzle body 71 , nozzle tip 73 , and collar 88 are preferably made of a metallic material, such as brass, while the remainder of the injector 28 is preferably made of a non-corrosive material, such as thermoplastic.
- a preferred type of material is polypropylene. Because chemicals are often corrosive in nature, it is desirable to avoid bombarding the nozzle body 71 and nozzle tip 73 with a chemical during high pressure spray. For this reason, during high pressure spray, fluid alone travels from the pump 12 through the nozzle 70 because the first chemical will not be introduced into the flow stream since the venturi at the pump is designed for low pressure spray.
- the second chemical is introduced downstream of any metallic parts, e.g., downstream from the nozzle 70 and the collar 88 .
- the first chemical combined with the fluid may travel through and around the nozzle 70 when in the low pressure mode since the metallic parts are designed to withstand a combination of fluid and chemicals at lower pressures.
- the present invention assists in deterring the degradation of the nozzle 70 and provides substantially greater nozzle life with the added flexibility of being able to introduce chemicals to the flow stream at both high and low pressures of spray.
- Other types of metallic materials may be used for the nozzle 70 and collar 88 .
- Alternate types of plastic materials may also be used for the cover 72 and body 74 . Advances in the art may provide opportunities to utilize plastic materials for the nozzle 70 and collar 88 .
- FIGS. 15 and 16 also depict a check valve 92 that is positioned at the second chemical inlet 68 .
- the check valve is utilized to prevent the back flow of fluid into the second chemical tank 44 during operation of the injector 28 .
- O-ring seals 90 are positioned between the injector body 74 and the cover 72 and between the collar 88 and the injector body 74 in order to prevent fluid from flowing in undesirable directions.
- the spray lance 26 is preferably threaded to the nozzle 70 at the entrance of the injector 28 using conventional screw threads 62 , although other types of attachment mechanisms may also be utilized.
- FIGS. 17-26 show the cap assembly 50 of the container 46 .
- the cap assembly 50 is a multi-position selector valve for controlling chemical flow from the container 46 and includes an inner cap member 94 and an outer cap member 96 .
- the outer cap member 96 is positioned adjacent to the inner cap member 94 and the inner cap member 94 abuts the opening 48 of the container 46 .
- the outer cap member 96 is movable relative to the inner cap member 94 in order to provide the cap assembly 50 with a number of operative positions.
- a first operative position is for use in the inverted position, e.g., when the injector 28 is pointed downward.
- a second operative position is for use in the upright position, e.g., when the injector 28 is pointed upwardly.
- a third position is an inoperative position, where the cap assembly 50 is closed so that no chemical can flow through the cap assembly 50 from the tank 44 .
- the inner cap member 94 includes an attachment mechanism 98 , shown in FIGS. 21-24 , for attaching the cap to the rim of the container 46 .
- a quarter-turn bayonet mount with a snap lock is provided.
- Mating bayonet mount threads are provided on the inner cap member 94 and the rim of the container 46 .
- the snap lock 100 is shown in FIG. 26 as including a prong 102 that extends outwardly from the side of the inner cap member 94 and a catch 104 that is positioned on and extends outwardly from the rim of the opening 48 of the container 46 .
- the prong 102 and catch 104 are both made of a plastic material and, as such, have a resiliency that allows the prong 102 to lock the inner cap member 94 to the container 46 , but, with sufficient application of force, allows the user to remove the cap assembly 50 from the container opening 48 .
- Other known attachment mechanisms can also be used, such as conventional screw threads, among other known mechanisms. It is preferred that the selected attachment mechanism provide a water tight seal in order to avoid the unwanted discharge of chemical from the tank. In this regard, a seal 51 may be utilized between the inner cap member 94 and the rim of the container 46 if desired.
- the outer cap member 96 is rotatably positioned on the inner cap member 94 and is retained on the inner cap member 94 by a screw 106 , which is shown positioned near the center of the cap assembly 50 in FIG. 17 .
- the outer cap member 96 includes a tab 108 that extends outwardly from the side of the cap assembly 50 and is configured so that a user may rotate the outer cap member 96 by moving the tab 108 .
- the inner cap member 94 includes a first opening 110 and a second opening 112 .
- the first opening 110 is a hole that extends through the surface of the inner cap member 94 and is for use in the inverted position. When the user points the injector 28 downwardly, chemical in the tank 44 will flow through the first opening 110 .
- the second opening 112 also is a hole that extends through the surface of the inner cap member 94 , but the second opening 112 is surrounded by an inwardly extending flange or rim 114 . This flange 114 is used to hold a section of tubing 116 that extends to the opposite end of the container 46 such that the tubing 116 is submerged in any chemical in the container 46 .
- the tubing 116 may extend around the flange 114 or be inserted inside the flange to hold it in position.
- the tubing 116 is 1 ⁇ 4 inch inside diameter plastic tubing.
- the flange 114 around the second opening 112 has a diameter sized to hold the plastic tubing 116 firmly in place.
- the second opening 112 is for the use of the container 46 in the upright position, and the tubing 116 preferably extends to the opposite end of the container 46 in order to suction out chemical when the container 46 is in an upright position.
- the second opening 112 may be used when the container 46 is in a horizontal position since the tubing 116 , which has some flexibility, will sink to the bottom of the tank 44 . Since the location of the bottom of the tank changes depending on the orientation of the tank 44 , the tubing 116 should always be submerged in the chemical as long as the tank 44 is not inverted.
- O-ring seals 118 are preferably positioned around each of the first and second openings 110 , 112 and serve to provide a seal between the inner and outer cap members 94 , 96 .
- the O-rings 118 may be positioned in recesses 120 defined on the outer surface of the inner cap member 94 , as shown in FIG. 17 , or may be positioned in recesses defined on the inner surface of the outer cap member (not shown).
- the O-rings 118 may be made of a rubber material, such as buna-nitrile.
- the O-rings 118 preferably span any gap that is present between the inner and outer cap members 94 , 96 in order to provide liquid-tight operation.
- the outer cap member 96 has a third opening 122 that extends through the surface of the outer cap member 96 .
- the outer cap member 96 includes an upstanding, outwardly facing flange or rim 124 that surrounds the third opening 122 .
- This flange 124 is sized to accept a conduit or tube 126 that extends to the second chemical inlet 68 of the injector 28 .
- the conduit can fit around the flange, as shown in FIG. 25 .
- the conduit 126 is 1 ⁇ 4 inch plastic tubing.
- the first, second, and third openings 110 , 112 , 122 may have a diameter that is about 1 ⁇ 8 inch, although this may vary depending upon the application and the size of the container 46 .
- the first, second, and third openings 110 , 112 , 122 are positioned so that when the outer cap member 96 is rotated relative to the inner cap member 94 , the third opening 122 may align with the first opening 110 or the second opening 112 of the inner cap member 94 .
- the first opening 110 aligns with the third opening 122 for inverted usage.
- the second opening 112 aligns with the third opening 122 for upright usage.
- the third opening 122 aligns with neither the first nor the second opening 110 , 112 in the closed position.
- the container 46 may include indicia 60 in the form of instructions to the user.
- the indicia 60 may align with the rotational positions of the outer cap member 96 to indicate “off”, “inverted”, or “upright” operation.
- the outer cap member 96 is rotatable through a desired angular range in order to move between the three positions.
- FIG. 17 shows one embodiment where the cap assembly 50 is rotatable through a 180° angular range.
- the first and second openings 110 , 112 are positioned 180° apart and the third, closed position is located between the first and second opening positions.
- FIGS. 18-25 depict a cap assembly 50 that is rotatable through a 90° angular range.
- the first and second openings 110 , 112 are positioned 90° apart and the third, closed position is located between the first and second opening positions.
- Other ranges for angular rotation may also be used, if desired.
- the third, closed position be between the first and second opening positions.
- the third, closed position could be positioned outside the angular range of the first and second opening positions.
- the third, closed position could be at 210° angular rotation, or another angular position.
- the outer cap member 96 utilizes a detent system for informing the user that the proper position has been located for the angular rotation of the cap.
- the outer cap member 96 has a projection 128 for mating with recesses positioned on the inner cap member 94 .
- the projection 128 aligns with a first recess 130 when the third opening 122 is aligned with the first opening 110 and with a second recess 132 when the third opening 122 is aligned with the second opening 112 .
- the projection 128 aligns with a third recess 136 when the third opening 122 is not aligned with the first or second openings 110 , 112 and is in a closed position.
- the projection 128 may be defined on a V-shaped cut out 134 in the outer cap member 96 that forms a V-spring.
- the projection 128 is dome-shaped.
- the inner cap member 94 also includes leveling bumps 138 , which extend outwardly from the surface of the inner cap member 94 to abut the outer cap member 96 .
- the leveling bumps 138 are positioned opposite the O-rings 118 around the first and second openings 110 , 112 .
- the leveling bumps are used to counteract the O-ring seals 118 , which extend above the upper surface of the inner cap member 94 and are used to level the inner and outer cap members 94 , 96 relative to one another. While the recesses 130 , 132 , 136 and leveling bumps 138 are shown positioned on the inner cap member 94 and the projection 128 is shown positioned on the outer cap member 96 , they could be oppositely arranged, if so desired.
- the inner and outer cap members 94 , 96 are preferably made of a non-corrosive material, such as a thermoplastic.
- a non-corrosive material such as a thermoplastic.
- One type of thermoplastic that may be utilized is polypropylene.
- the first chemical tank inlet can be positioned at any point in the flow path prior to the nozzle, as long as a venturi is positioned adjacent the first chemical inlet in the flow path.
- the first chemical inlet could be positioned on the spray wand upstream from the nozzle.
- the first chemical inlet could be positioned in the injector prior to the nozzle.
- the second chemical tank could be utilized for supplying a chemical at the first chemical inlet, as well as at the second chemical inlet. Appropriate valving would be necessary in order to distribute the chemical at either the first or the second chemical inlet in the low or high pressure spray mode.
- a single chemical tank would be necessary to provide the three or four modes of operation of the pressure washer, as discussed above.
Abstract
A container for use with a pressure washer spray lance includes a hollow member having an opening for housing a chemical and a cap assembly. The cap assembly for the container includes an inner member and an outer member and is configured to allow the use of the container in an inverted or upright position.
Description
- The claimed invention relates to a pressure washer that is configured to spray soap at both a high and a low pressure. The pressure washer includes a spray lance and an injector and a chemical tank is attached to the spray lance. The tank is operable in both an upright and an inverted position. The injector includes a metallic nozzle and a plastic aspirator.
- A pressure washer is a device that includes a pump, a hose, and a spray lance having an injector. A fluid source, such as water, is connected to the pump and fluid is pumped through the hose and out the injector for application to a surface. It is often desirable in pressure washer applications to utilize a chemical, such as detergent, to clean a surface. Surfaces that are typically treated with a pressure washer may be at ground level or higher. It is not uncommon for a pressure washer to be used to spray a multi-story building, such as a three story house, or a single level structure, such as a deck or porch.
- Typical pressure washers spray soap at either a low pressure or a high pressure. A user will typically use low pressure spray to reach easy to reach areas and high pressure spray to reach hard to reach areas, such as the second story of a home or office building. With existing low pressure soap sprayers, soap can be applied to the first story of a house, but not to higher stories. In order to reach higher stories, it is necessary to use a ladder in conjunction with the spray lance, while the pump and soap container remains on the ground. With existing high pressure soap sprayers, soap can be applied to the upper stories of a house, but not at lower stories because the high pressure of the sprayer may result in damage to the facade of the house. High pressure applicators can be used on lower stories only if the user backs a far enough distance away from the structure, in order to avoid damaging the facade.
- Pressure washers and other sprayers utilize a venturi effect to suction a chemical into a flow stream. Venturis are well known for introducing a second fluid into a first fluid. The second fluid is introduced through an aspirator inlet that is typically aligned with a narrowed portion of the venturi, or positioned downstream of the venturi. In operation, the second fluid to be introduced is sucked into the venturi through the aspirator inlet as fluid flows through the venturi tube. For a given venturi tube, the aspiration rate depends on the flow rate of the fluid which passes through the venturi inlet and the viscosity of the fluids.
- According to one embodiment of the invention, a container for coupling to a spray lance includes a hollow member having at least one opening and at least one attachment mechanism for attaching the hollow member to a spray lance of a pressure washer. The hollow member is configured to house a chemical.
- In another embodiment, a container for coupling to a spray lance includes a hollow member and a cap assembly. The hollow member has at least one opening and at least one attachment mechanism for attaching the hollow member to a spray lance. The hollow member is configured to house a chemical. The cap assembly has an inner cap member with a first and a second opening and an outer cap member with a third opening. The outer cap member is movable relative to the inner cap member such that the third opening aligns with the first opening when the cap is in a first operative position, the third opening aligns with the second opening when the cap is in a second operative position, and the third opening aligns with neither the first nor the second opening when the cap is in a third inoperative position.
- In yet another embodiment, a cap assembly for a container that is usable in both an upright and an inverted position is provided. The cap assembly includes an inner cap member and an outer cap member. The inner cap member has a first and a second opening. The outer cap member has a third opening and is positioned adjacent the inner cap member. The outer cap member is rotatable relative to the inner cap member into at least three operative positions, such that the third opening aligns with the first opening when the cap is in a first operative position, the third opening aligns with the second opening when the cap is in a second operative position, and the third opening aligns with neither the first nor the second opening when the cap is in a third inoperative position.
-
FIG. 1 is a view of a pressure washer according to the invention; -
FIG. 2 is partial view of the pump and first chemical inlet of the pressure washer; -
FIG. 3 is a partial view of the pump showing the first chemical inlet in greater detail; -
FIG. 4 is a perspective view of the spray lance and injector according to the invention incorporating a chemical tank attached to the spray lance; -
FIG. 5 is a perspective view of the chemical tank shown inFIG. 4 ; -
FIG. 6 is an end view of the chemical tank ofFIG. 5 ; -
FIG. 7 is a top view of the spray lance and injector according to the invention; -
FIG. 8 is a side view of the spray lance and injector ofFIG. 6 ; -
FIG. 9 is a bottom view of the spray lance and injector ofFIG. 6 ; -
FIG. 10 is a cross-sectional view of the cover of the injector shown inFIG. 6 ; -
FIG. 11 is an end view of the cover shown inFIG. 9 ; -
FIG. 12 is a cross-sectional view of injector body of the injector shown inFIG. 6 ; -
FIG. 13 is a partial top view of the injector shown inFIG. 6 ; -
FIG. 14 is a partial bottom view of the injector shown inFIG. 6 ; -
FIG. 15 is a cross-sectional view of the injector shown inFIG. 6 in a high pressure spray mode; -
FIG. 16 is a cross-sectional view of the injector ofFIG. 15 , but in a low pressure spray mode; -
FIG. 17 is a cross-sectional view of the cap assembly according to the invention; -
FIG. 18 is a perspective bottom view of the outer cap member of the cap assembly shown inFIG. 17 ; -
FIG. 19 is a perspective top view of the outer cap member ofFIG. 18 ; -
FIG. 20 is a cross-sectional view of the outer cap member shown inFIG. 19 , taken along line 20-20; -
FIG. 21 is a perspective top view of the inner cap member of the cap assembly shown inFIG. 17 ; -
FIG. 22 is a perspective bottom view of the inner cap member ofFIG. 21 ; -
FIG. 23 is a top view of the inner cap member shown inFIG. 21 ; -
FIG. 24 is a cross-sectional view of the inner cap member ofFIG. 23 , taken along line 24-24; -
FIG. 25 is a partial perspective view of the cap assembly installed on the chemical tank; and -
FIG. 26 is an exploded view of the locking mechanism for the cap assembly. -
FIG. 1 shows a pressure washer 10 according to the invention andFIGS. 2-3 show several exploded views of thepressure washer 10 ofFIG. 1 . Thepressure washer 10 includes apump 12 for pumping a fluid from a fluid source (not shown). Thepump 12 includes aninlet 14 for receiving a fluid from the fluid source and anoutlet 16 for pumping the fluid at a pressure. Thepump 12 is operated by amotor 18, which may be powered by gas, electric, or another energy source. Thepump 12 andmotor 18 are preferably positioned on asupport structure 20, such as the cart shown, so that they may be easily maneuvered around a job site. Ahose 22 is connected to anoutlet 16 of thepump 12 and aspray gun 24, aspray lance 26, and aninjector 28 are connected to thehose 22 for spraying a fluid that is received under pressure from thepump 12. Thespray gun 24 includes ahandle 30 and atrigger 32 for opening thespray lance 26 to receive fluid from thepump 12. The operator pulls thetrigger 32 in order to open flow of a fluid from thepump 12. - The
pressure washer 10 is configured to spray a fluid out of theinjector 28 at a pressure range that ranges from a low pressure to a high pressure. In a preferred embodiment, thepressure washer 10 is configured to spray at a low pressure range of about 25 to about 200 psi and at a high pressure range of about 500 to about 3200 psi. - A
first chemical tank 34 is positioned on thecart 20 and includes a conduit ortube 36, shown best inFIG. 2 , that extends from thefirst chemical tank 34 to afirst chemical inlet 38 of thepump 12, shown best inFIG. 3 . Thefirst chemical tank 34 is preferably made of a non-corrosive plastic material and is utilized for storing chemicals, such as detergent, among other chemical substances. In one embodiment, thefirst chemical tank 34 is made of a thermoplastic material, such as high density polyethylene. Other types of impact resistant, non-corrosive materials may also be used for the tank. Thefirst chemical tank 34 is provided in order to introduce a first chemical into the fluid. When the first chemical is introduced into the fluid, the fluid combined with the first chemical travels through thehose 22 to thespray lance 26 and is sprayed onto a surface through theinjector 28. - The
pump 12 includes a venturi (not shown) that is positioned in the fluid line in alignment with thefirst chemical inlet 38. Venturis are well known in the art for introducing a second fluid into a first fluid. The venturi is utilized to create a vacuum in the vicinity of the venturi and this vacuum serves to suction the first chemical from thefirst chemical tank 34 into the fluid. Venturis typically have an aspiration rate that is dependent upon the flow rate of the fluid that flows through the venturi tube. The pump venturi is designed to suction a first chemical when thepump 12 is operating in the low pressure spray range, described above. Thus, thepump 12 is configured to pump either a fluid from the fluid source, or a combination of the fluid from the fluid source combined with a first chemical from thefirst chemical tank 34. - A valve may be positioned between the
first chemical tank 34 and thefirst chemical inlet 38 for opening and closing the flow of the first chemical from the tank. Thus, in order to allow the first chemical to flow, the operator must open the valve between thefirst chemical tank 34 and thefirst chemical inlet 38. - The
pressure washer 10 also utilizes asecond chemical tank 44, shown inFIGS. 1 and 4 -6. Thesecond chemical tank 44 is utilized to spray a second chemical, which may be the same as or different from the first chemical. Thesecond chemical tank 44 is preferably made of a non-corrosive plastic material and is utilized for storing chemicals, such as bleach or detergent, among other chemical substances. In one embodiment, thesecond chemical tank 44 is made of a thermoplastic material, such as high density polyethylene. Other types of impact resistant, non-corrosive materials may also be used for thesecond chemical tank 44. - The
second chemical tank 44 is preferably an elongated, tube-shaped,hollow container 46 that has anopening 48 at one end. Theopening 48 is closed by acap assembly 50, which will be described in greater detail below. Thesecond chemical tank 44 is provided in order to introduce a second chemical into the fluid as the fluid travels through theinjector 28. When the second chemical is introduced into the fluid, the fluid combined with the second chemical is sprayed through theexit 52 of theinjector 28. - As shown in
FIG. 4 , thecontainer 46 includes anattachment mechanism 54. In the embodiment shown, theattachment mechanism 54 includes threeclips 56 that are positioned in alignment on one side of thecontainer 46. Theclips 56 are configured so that a first and asecond clip 56 face athird clip 56 and such that the three clips together snap on and firmly engage aspray lance 26. As shown, thespray lance 26 is an elongated tube, which may be made of steel or another rigid material. Theclips 56 have a cross-section, shown inFIG. 6 , such that they firmly grip the elongated tube of thespray lance 26. Theclips 56 each may have the same cross-section, but with the middle clip being a mirror image of the end clips. Alternatively, theclips 56 may have different cross-sections. In a preferred embodiment, shown inFIG. 6 , the middle clip has a different cross-section than the end clips in order to allow ease in attaching thecontainer 46 to thespray lance 26. Theclips 56 are configured so that thecontainer 46 is immovable relative to thelance 26 and integral with thelance 26 when thecontainer 46 is clipped to thelance 26. When the user moves thelance 26, thecontainer 46 moves with the lance. - The
container 46 may have any desired length. As shown inFIG. 1 , thecontainer 46 may have a length that is less than the length of thespray lance 26, or may have a length, as shown inFIG. 4 , that exceeds the length of the lance. Theattachment mechanism 54 is designed so that thecontainer 46 may be removed from or replaced onto thespray lance 26, when desired. Other forms of the attachment mechanism may alternatively be used, such as other clip or snap-on designs, or designs that utilize screws, clamps or bolts, among other designs. Alternatively, other attachment mechanisms may be utilized to connect thecontainer 46 at other points on thespray gun 24. A stand alone tank (not shown) that sits on the ground may be used, if desired, as long as a conduit or hose extends from the tank to theinjector 28 to allow the suctioning of the second chemical into the fluid. Acontainer 46 that is attached to thespray lance 26 is preferred and desirable because it allows for portability of the unit and does not require the user to lug around an additional hose. In a preferred embodiment, thecontainer 46 holds 1/2 gallon of chemical. Other shapes and sizes ofcontainer 46 may also be utilized, the invention not being limited to the shape and size ofcontainer 46 shown. - The
container 46 may includeadvertising indicia 58, if so desired. In addition, operatinginstructions 60 may be positioned on the tank for assisting the operator in using thecontainer 46 or thecap assembly 50. - In one embodiment, the
pressure washer 10 has three operative modes. The first mode includes low pressure spray of fluid combined with the first chemical. The second mode include high pressure spray of fluid without chemical and the third mode includes high pressure spray of the fluid combined with the second chemical. In a second embodiment, the pressure washer has four operative modes that include the first, second and third modes and an additional fourth mode. The fourth mode includes low pressure spray of the fluid without the first chemical. - The
injector 28 andspray lance 26 are shown inFIGS. 7-16 in various orientations. Thespray lance 26 is attached to theinjector 28 in a conventional manner, such as withscrew threads 62. Thespray lance 26 is connected to thespray gun 24, at the other end, utilizingscrew threads 63 or other attachment mechanisms known to those of skill in the art. It is preferred that theinjector 28 have a movableexternal member 64 that can move axially as well as rotationally.FIGS. 7 and 13 show a top view of theinjector 28 andoperational indicia 66 that may be included on theinjector 28. In this view, the user is prompted to vary the flow from high to low pressure by moving theexternal member 64 forward or rearward. In the forward position, theinjector 28 will introduce flow at a low pressure while in the rearward position, theinjector 28 will introduce flow at a high pressure.FIG. 8 shows a side view of theinjector 28, showing thesecond chemical inlet 68 to theinjector 28.FIGS. 9 and 14 show a bottom view of theinjector 28, withinstructions 66 on how to vary the spray pattern of flow coming from theinjector 28 by rotating theexternal member 64. The user rotates theinjector 28 clockwise to emit a fan-like spray pattern and the user rotates theinjector 28 counter clockwise to emit a stream of fluid. Various positions between the two extremes of a fan and a stream are provided by rotating the external member 64 a partial turn. Other types of spray patterns may also be provided in addition to or instead of the described spray patterns. - As shown in
FIGS. 10-12 and 15-16, theinjector 28 includes anexternal member 64 and anozzle 70. Theexternal member 64 includes acover 72 and aninjector body 74. Theinjector body 74 extends inside of thecover 72 and includes thesecond chemical inlet 68 and theventuri 82. Thecover 72 andinjector body 74 are positioned adjacent one another and are axially movable relative to thenozzle 70. Axial movement of theexternal member 64 allows the user to alter the pressure of the fluid being discharged from theinjector 28 between a low pressure and a high pressure.FIG. 13 showsindicia 66 on the outer surface of thecover 72 that describes the position of thecover 72 in order to obtain low and high pressure spray. Thecover 72 is also rotatable relative to theinjector body 74 to change the spray pattern. As shown inFIG. 14 , thecover 72 includesindicia 66 on an outer surface that describes the position of thecover 72 in order to alter the spray pattern from a fan to a jet. - The
injector body 74 includes aninternal passageway 76 in which thenozzle 70 seats and fluid flows. Theventuri 82 is defined in theinternal passageway 76. In addition, theinjector body 74 may includespray arms 78. The spray arms may be formed integral with the injector body, or may be formed as separate flow directing members. Aspray deflecting member 79 may be seated inside thespray arms 78 and extends longitudinally toward theinjector outlet 52. When thecover 72 is rotated, thespray arms 78 orspray deflecting members 79 move against surfaces defined on the interior of thecover 72 in order to deflect thespray deflecting member 79 to provide the desired spray pattern from theinjector 28. - As shown in
FIGS. 15 and 16 , thenozzle 70 is positioned inside theinjector body 74 and includes a longitudinalinternal passageway 80 that aligns with theinternal passageway 76 of theinjector body 74. Thenozzle 70 is shown as including two parts: 1) anozzle body 71 and 2) anozzle tip 73. Thenozzle tip 73 may be screwed into thenozzle body 71, or otherwise connected to thenozzle body 71. Alternatively, thenozzle tip 73 can be integrally formed with thenozzle body 71 so that they together are formed as a single piece. Thenozzle tip 73 includes a flow restricting portion for restricting the flow through thenozzle 70. Thenozzle 70 also includes anexternal passageway 84 that travels around thenozzle 70 through ahole 86 that is positioned in theinternal passageway 80 of thenozzle 70. Thehole 86 in thenozzle 70 allows fluid to travel from theinternal passageway 80 to theexternal passageway 84 around the side and front of thenozzle 70. The fluid flows around thenozzle 70 and then joins with fluid that travels through theinternal passageway 80 to theinternal passageway 76 of theinjector body 74. Theexternal passageway 84 is bounded by acollar 88 that is positioned around thenozzle 70 and is movable with theinjector body 74. O-rings seals 90 are positioned between thecollar 88 and thenozzle 70. The O-rings 90 are used to close theexternal passageway 84 when thecollar 88 is in a first rearward position and to allow flow to travel through theexternal passageway 84 when thecollar 88 is in a second forward position. -
FIG. 15 shows theinjector 28 in a high pressure spray position, where fluid only flows through theinternal passageway 80 of thenozzle 70 and thenozzle tip 73. In this position, thecollar 88 is positioned so that the O-rings 90 close theexternal passageway 84. The fluid exits through thenozzle tip 73 and passes through theventuri 82 defined in theinternal passageway 76 of theinjector body 74. The fluid passes through theventuri 82 at a pressure that creates a vacuum downstream of thenozzle 70 and allows suctioning of the second chemical from thesecond chemical tank 44 through thesecond chemical inlet 68, which is positioned downstream from thenozzle 70 in theinjector body 74. -
FIG. 16 shows theinjector 28 in a low pressure spray position, where fluid flows both through theinternal passageway 80 and through theexternal passageway 84 around thenozzle 70. In this embodiment, thecollar 88 is positioned at a forward position so that theexternal passageway 84 is open. Flow enters thehole 86 in thenozzle 70 and exits around thenozzle 70, through theexternal passageway 84 until it joins with theinternal passageway 76 of theinjector body 74. This forward position of thecollar 88 andinjector body 74 represents the low pressure flow position, and chemical from thesecond chemical inlet 68 will not be introduced into the fluid because the vacuum required to suction the second chemical from thesecond chemical tank 44 is not present. - The
injector 28 preferably includes a combination of metallic and non-metallic materials designed to deter corrosion of the metallic parts. Thenozzle body 71,nozzle tip 73, andcollar 88 are preferably made of a metallic material, such as brass, while the remainder of theinjector 28 is preferably made of a non-corrosive material, such as thermoplastic. A preferred type of material is polypropylene. Because chemicals are often corrosive in nature, it is desirable to avoid bombarding thenozzle body 71 andnozzle tip 73 with a chemical during high pressure spray. For this reason, during high pressure spray, fluid alone travels from thepump 12 through thenozzle 70 because the first chemical will not be introduced into the flow stream since the venturi at the pump is designed for low pressure spray. In the high pressure spray mode, the second chemical is introduced downstream of any metallic parts, e.g., downstream from thenozzle 70 and thecollar 88. In contrast, the first chemical combined with the fluid may travel through and around thenozzle 70 when in the low pressure mode since the metallic parts are designed to withstand a combination of fluid and chemicals at lower pressures. By utilizing a combination of metallic and plastic parts, and introducing the chemicals at different positions in the flow path depending on the pressure of the spray, the present invention assists in deterring the degradation of thenozzle 70 and provides substantially greater nozzle life with the added flexibility of being able to introduce chemicals to the flow stream at both high and low pressures of spray. Other types of metallic materials may be used for thenozzle 70 andcollar 88. Alternate types of plastic materials may also be used for thecover 72 andbody 74. Advances in the art may provide opportunities to utilize plastic materials for thenozzle 70 andcollar 88. -
FIGS. 15 and 16 also depict acheck valve 92 that is positioned at thesecond chemical inlet 68. The check valve is utilized to prevent the back flow of fluid into thesecond chemical tank 44 during operation of theinjector 28. In addition, O-ring seals 90 are positioned between theinjector body 74 and thecover 72 and between thecollar 88 and theinjector body 74 in order to prevent fluid from flowing in undesirable directions. Thespray lance 26 is preferably threaded to thenozzle 70 at the entrance of theinjector 28 usingconventional screw threads 62, although other types of attachment mechanisms may also be utilized. -
FIGS. 17-26 show thecap assembly 50 of thecontainer 46. Thecap assembly 50 is a multi-position selector valve for controlling chemical flow from thecontainer 46 and includes aninner cap member 94 and anouter cap member 96. Theouter cap member 96 is positioned adjacent to theinner cap member 94 and theinner cap member 94 abuts theopening 48 of thecontainer 46. - The
outer cap member 96 is movable relative to theinner cap member 94 in order to provide thecap assembly 50 with a number of operative positions. A first operative position is for use in the inverted position, e.g., when theinjector 28 is pointed downward. A second operative position is for use in the upright position, e.g., when theinjector 28 is pointed upwardly. A third position is an inoperative position, where thecap assembly 50 is closed so that no chemical can flow through thecap assembly 50 from thetank 44. - The
inner cap member 94 includes anattachment mechanism 98, shown inFIGS. 21-24 , for attaching the cap to the rim of thecontainer 46. In a preferred embodiment, a quarter-turn bayonet mount with a snap lock is provided. Mating bayonet mount threads are provided on theinner cap member 94 and the rim of thecontainer 46. The snap lock 100 is shown inFIG. 26 as including aprong 102 that extends outwardly from the side of theinner cap member 94 and acatch 104 that is positioned on and extends outwardly from the rim of theopening 48 of thecontainer 46. Theprong 102 and catch 104 are both made of a plastic material and, as such, have a resiliency that allows theprong 102 to lock theinner cap member 94 to thecontainer 46, but, with sufficient application of force, allows the user to remove thecap assembly 50 from thecontainer opening 48. Other known attachment mechanisms can also be used, such as conventional screw threads, among other known mechanisms. It is preferred that the selected attachment mechanism provide a water tight seal in order to avoid the unwanted discharge of chemical from the tank. In this regard, aseal 51 may be utilized between theinner cap member 94 and the rim of thecontainer 46 if desired. - The
outer cap member 96 is rotatably positioned on theinner cap member 94 and is retained on theinner cap member 94 by ascrew 106, which is shown positioned near the center of thecap assembly 50 inFIG. 17 . Theouter cap member 96 includes atab 108 that extends outwardly from the side of thecap assembly 50 and is configured so that a user may rotate theouter cap member 96 by moving thetab 108. - The
inner cap member 94, as shown inFIGS. 17 and 21 -24, includes afirst opening 110 and asecond opening 112. Thefirst opening 110 is a hole that extends through the surface of theinner cap member 94 and is for use in the inverted position. When the user points theinjector 28 downwardly, chemical in thetank 44 will flow through thefirst opening 110. Thesecond opening 112 also is a hole that extends through the surface of theinner cap member 94, but thesecond opening 112 is surrounded by an inwardly extending flange orrim 114. Thisflange 114 is used to hold a section oftubing 116 that extends to the opposite end of thecontainer 46 such that thetubing 116 is submerged in any chemical in thecontainer 46. Thetubing 116 may extend around theflange 114 or be inserted inside the flange to hold it in position. In a preferred embodiment, thetubing 116 is ¼ inch inside diameter plastic tubing. Theflange 114 around thesecond opening 112 has a diameter sized to hold theplastic tubing 116 firmly in place. Thesecond opening 112 is for the use of thecontainer 46 in the upright position, and thetubing 116 preferably extends to the opposite end of thecontainer 46 in order to suction out chemical when thecontainer 46 is in an upright position. In addition, thesecond opening 112 may be used when thecontainer 46 is in a horizontal position since thetubing 116, which has some flexibility, will sink to the bottom of thetank 44. Since the location of the bottom of the tank changes depending on the orientation of thetank 44, thetubing 116 should always be submerged in the chemical as long as thetank 44 is not inverted. - O-
ring seals 118 are preferably positioned around each of the first andsecond openings outer cap members rings 118 may be positioned inrecesses 120 defined on the outer surface of theinner cap member 94, as shown inFIG. 17 , or may be positioned in recesses defined on the inner surface of the outer cap member (not shown). The O-rings 118 may be made of a rubber material, such as buna-nitrile. The O-rings 118 preferably span any gap that is present between the inner andouter cap members - The
outer cap member 96, as shown inFIGS. 17-20 , has athird opening 122 that extends through the surface of theouter cap member 96. Theouter cap member 96 includes an upstanding, outwardly facing flange orrim 124 that surrounds thethird opening 122. Thisflange 124 is sized to accept a conduit ortube 126 that extends to thesecond chemical inlet 68 of theinjector 28. Alternatively, the conduit can fit around the flange, as shown inFIG. 25 . In a preferred embodiment, theconduit 126 is ¼ inch plastic tubing. In addition, the first, second, andthird openings container 46. - The first, second, and
third openings outer cap member 96 is rotated relative to theinner cap member 94, thethird opening 122 may align with thefirst opening 110 or thesecond opening 112 of theinner cap member 94. Thefirst opening 110 aligns with thethird opening 122 for inverted usage. Thesecond opening 112 aligns with thethird opening 122 for upright usage. Thethird opening 122 aligns with neither the first nor thesecond opening - The
container 46 may includeindicia 60 in the form of instructions to the user. For instance, theindicia 60 may align with the rotational positions of theouter cap member 96 to indicate “off”, “inverted”, or “upright” operation. - The
outer cap member 96 is rotatable through a desired angular range in order to move between the three positions. For example,FIG. 17 shows one embodiment where thecap assembly 50 is rotatable through a 180° angular range. In this embodiment, the first andsecond openings FIGS. 18-25 depict acap assembly 50 that is rotatable through a 90° angular range. InFIGS. 18-25 , the first andsecond openings - The
outer cap member 96 utilizes a detent system for informing the user that the proper position has been located for the angular rotation of the cap. Theouter cap member 96 has aprojection 128 for mating with recesses positioned on theinner cap member 94. Theprojection 128 aligns with afirst recess 130 when thethird opening 122 is aligned with thefirst opening 110 and with asecond recess 132 when thethird opening 122 is aligned with thesecond opening 112. Theprojection 128 aligns with athird recess 136 when thethird opening 122 is not aligned with the first orsecond openings projection 128 and recesses 130, 132, 136 provides a tactile message to the user when thethird opening 122 is properly aligned with either the first orsecond openings FIGS. 18-20 , theprojection 128 may be defined on a V-shaped cut out 134 in theouter cap member 96 that forms a V-spring. In a preferred embodiment, theprojection 128 is dome-shaped. - The
inner cap member 94 also includes levelingbumps 138, which extend outwardly from the surface of theinner cap member 94 to abut theouter cap member 96. The leveling bumps 138 are positioned opposite the O-rings 118 around the first andsecond openings ring seals 118, which extend above the upper surface of theinner cap member 94 and are used to level the inner andouter cap members recesses bumps 138 are shown positioned on theinner cap member 94 and theprojection 128 is shown positioned on theouter cap member 96, they could be oppositely arranged, if so desired. - The inner and
outer cap members - It should be noted that while the first chemical tank is shown positioned on the cart next to the pump, the first chemical tank inlet can be positioned at any point in the flow path prior to the nozzle, as long as a venturi is positioned adjacent the first chemical inlet in the flow path. For instance, the first chemical inlet could be positioned on the spray wand upstream from the nozzle. The first chemical inlet could be positioned in the injector prior to the nozzle. The second chemical tank could be utilized for supplying a chemical at the first chemical inlet, as well as at the second chemical inlet. Appropriate valving would be necessary in order to distribute the chemical at either the first or the second chemical inlet in the low or high pressure spray mode. Thus, in this embodiment, which is not shown, a single chemical tank would be necessary to provide the three or four modes of operation of the pressure washer, as discussed above.
- While various features of the claimed invention are presented above, it should be understood that the features may be used singly or in any combination thereof. Therefore, the claimed invention is not to be limited to only the specific embodiments depicted herein.
- Further, it should be understood that variations and modifications may occur to those skilled in the art to which the claimed invention pertains. The embodiments described herein are exemplary of the claimed invention. The disclosure may enable those skilled in the art to make and use embodiments having alternative elements that likewise correspond to the elements of the invention recited in the claims. The intended scope of the invention may thus include other embodiments that do not differ or that insubstantially differ from the literal language of the claims. The scope of the present invention is accordingly defined as set forth in the appended claims.
Claims (22)
1. A container for coupling to a spray lance of a pressure washer comprising:
a hollow member having at least one opening and at least one attachment mechanism for attaching the hollow member to a spray lance, said hollow member being configured to house a chemical.
2. The container of claim 1 , wherein the attachment mechanism comprises three clips aligned on a side of the hollow member, said clips being configured to attach the hollow member to a spray lance.
3. The container of claim 2 , wherein the three clips each have a cross-section and comprise two end clips and a middle clip, with the end clips having a first cross-section and the middle clip having a second cross-section.
4. The container of claim 2 , wherein the hollow member has an elongated, tube-like shape that is closed at one end and has an opening at the other end.
5. The container of claim 2 , further comprising a cap coupled to the at least one opening for assisting in retaining a chemical in the hollow member.
6. The container of claim 5 , wherein the cap includes at least one opening and has three operative positions, a first operative position opening the at least one opening for inverted use of the container, a second operative position opening the at least one opening for upright use of the container, and a third operative position closing the at least one opening.
7. The container of claim 1 , wherein the hollow member has a length that is equal to or less than a length of a spray lance of a pressure washer.
8. The container of claim 1 , wherein the at least one attachment mechanism is configured to position the hollow member parallel to a spray lance of a pressure washer.
9. A container for coupling to a spray lance comprising:
a hollow member having at least one opening and at least one attachment mechanism for attaching the hollow member to a spray lance, said hollow member being configured to house a chemical; and
a cap assembly having an inner cap member with a first and a second opening and an outer cap member with a third opening, wherein the outer cap member is movable relative to the inner cap member such that the third opening aligns with the first opening when the cap is in a first operative position, the third opening aligns with the second opening when the cap is in a second operative position, and the third opening aligns with neither the first nor the second opening when the cap is in a third inoperative position.
10. The container of claim 9 , further comprising a locking assembly for locking the cap assembly to the hollow member opening, said locking assembly comprising a projection extending from the inner cap member and a catch positioned on the container, said projection configured to engage the catch in a removably locking manner.
11. A cap assembly for a container that is usable in both an upright and an inverted position, the cap assembly comprising:
an inner cap member having a first and a second opening; and
an outer cap member having a third opening and being coupled adjacent to the inner cap member, said outer cap member being rotatable relative to the inner cap member into at least three operative positions, such that the third opening aligns with the first opening when the cap is in a first operative position, the third opening aligns with the second opening when the cap is in a second operative position, and the third opening aligns with neither the first nor the second opening when the cap is in a third inoperative position.
12. The cap assembly of claim 11 , wherein the inner cap member includes an attachment mechanism for attaching the cap assembly to an opening of a container in a non-leaking manner.
13. The cap assembly of claim 11 , wherein the first operative position is for inverted usage of a container and the second operative position is for upright usage of a container.
14. The cap assembly of claim 13 , further comprising a conduit coupled to the second opening and extending into the container for operation in the second operative position.
15. The cap assembly of claim 13 , wherein an upstanding rim is positioned around the third opening, said upstanding rim being configured to accept a conduit through which a fluid can exit from the cap assembly.
16. The cap assembly of claim 11 , further comprising a locking assembly for locking the cap assembly to a container.
17. The cap assembly of claim 16 , wherein the locking assembly comprises a prong extending from a side wall of the inner cap member, the prong being configured to engage a catch positioned on a container.
18. The cap assembly of claim 11 , wherein the inner cap member is plastic and the outer cap member is plastic.
19. The cap assembly of claim 11 , wherein a seal is positioned in the vicinity of the first opening between the inner cap member and the outer cap member, and a seal is positioned in the vicinity of the second opening between the inner cap member and the outer cap member.
20. The cap assembly of claim 11 , further comprising a detent system for informing a user when the outer cap member is positioned in one of the at least three operative positions.
21. The cap assembly of claim 20 , wherein the detent system comprises a projection extending outwardly from the outer cap member and at least three recesses defined on the inner cap member, the projection being configured to engage the recesses one at a time upon the angular rotation of the outer cap member, with each recess representing one of the at least three operative positions.
22. The cap assembly of claim 11 , wherein the outer cap member is rotatable through about a 90° angular range between the three operative positions.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/750,117 US20050155972A1 (en) | 2003-12-31 | 2003-12-31 | Container and cap assembly for pressure washer |
CNA2004100769528A CN1636641A (en) | 2003-12-31 | 2004-08-31 | Container and cap assembly for pressure washer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/750,117 US20050155972A1 (en) | 2003-12-31 | 2003-12-31 | Container and cap assembly for pressure washer |
Publications (1)
Publication Number | Publication Date |
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US20050155972A1 true US20050155972A1 (en) | 2005-07-21 |
Family
ID=34749317
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/750,117 Abandoned US20050155972A1 (en) | 2003-12-31 | 2003-12-31 | Container and cap assembly for pressure washer |
Country Status (2)
Country | Link |
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US (1) | US20050155972A1 (en) |
CN (1) | CN1636641A (en) |
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EP2033716A2 (en) * | 2007-09-10 | 2009-03-11 | Techtronic Industries Company Limited | Adjustable nozzle for pressure washer |
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US20150191301A1 (en) * | 2014-01-03 | 2015-07-09 | I-Sin Peng | Bucket |
WO2016038578A1 (en) * | 2014-09-11 | 2016-03-17 | Mtm Hydro S.R.L. | Foam generating device for a high-pressure water gun |
USD778011S1 (en) * | 2015-03-16 | 2017-01-31 | Fna Group, Inc. | Pressure washer |
USD804750S1 (en) * | 2013-10-08 | 2017-12-05 | Briggs & Stratton Corporation | Pressure washer |
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