US2416418A - Convertible pneumatic cleaning apparatus - Google Patents

Description

'' Feb; 25, 1947'. c, H. TAYLOR 2,416,418

CONVERTIBLE PNEUMATIC CLEANING APPARATUS Filed Sept. 27, 1943 4 Shpets-Sheet 1 VIINVENTOR CHRRLES H. TRYLOR WITNESSES:

ORNEY Feb. 25, 1947.

C. H. TAYLOR convsn'rmuz PNEUMATIC CLEANING APPARATUS Filed Sept. 27. 1943 4 Sheets-Shet 2 CHnRLes H. Tanoa.

A ORNEY Feb. 25, 1947.

C H. TAYLOR cONVERTIBLE PNEUMATIC CLEANING APPARATUS Filed Sept. 27,

1943 4 Sheets-Sheet 3 IIIIIJIIIIIIIIIIIIIII F i c 1E INVENTOR 7 CHARLES H.TRYLOR- ORNEY 3 Feb. 25, 1947. c. H. TAYLOR 2,416,418

CONVERTIBLE PNEUMATIC CLEANING APPARATUS Filed Sept. 27, 1943 4 4 Sheets-Sheet 4 FIG. 13.

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A ORNEY Patented Feb. 1947 COMRTIBLKpgNEUMATIC CLEANING ARATUS Charles H. Taylor, Springfield, Mam, asslgnor to Westinghouse Electric Corporation, East Pittsburgh, Pa... a corporation of Pennsylvania Application September 27, 1943, Serial No. 503,915

8 Claims. (01. 15-9) My invention relates to a suction cleaner. More particularly it relates to a suction cleaner in which a suction nozzle for cleaning the floor is carried by the casing that houses the suction cleaning device or fan. In cleaning the floor or floor covering, the casing is propelled over the surface to be cleaned and this manner of use is referred to herein as floor-nozzle cleaning. The cleaner is also provided with an attachment hose connectible at one end to the suction side of the fan and having attachments connected at its other end. Use oi the cleaner with the suction applied to the hose is referred to herein as attachment cleaning or attachment suction cleaning. The attachment hose is also connectible to the discharge side of the fan to blow air through the hose and any attachment that may be connected to the other end, and such use is referred to hereinas attachment blowing.

One object of my invention is to produce an improved suction cleaner of the type set forth.

A further object of my invention is to produce an improved converting mechanism for a cleaner or the type set forth, which is easy to manipulate.

' A still further object of my invention is to produce a suction cleaner of the type set forth in which the converting mechanism is built into and forms part of the cleaner construction, while the means for actuating the converting mechanism from one operative position to the other is car- 'ried by the inner end of an attachment hoseZ a Still more particularly, my invention relates to a suction cleaner, of the type set forth, that is readily convertible from one type of cleaning to another.

raised from contact with the surface being cleaned, together with .means for retaining said brush roll in its raised position until the cleaner has been reconverted to the floor-nozzle cleaning position.

These and other objects are effected by my Fig. 3 is a perspective view of a guidingand latching mechanism forming part of my invention;

i Fig. 4 is a view similar to Fig. 1 showing, in solid lines, the position of the parts when the cleaner is converted to attachment suction cleaning and showing in dotted lines the position of the parts when the cleaner is converted toattachment blowing;

Fig. 5 is an enlarged, fragmentary view in horizontal section showing the first step in converting the cleaner from floor-nozzle cleaning to attachment suction cleaning or attachment blowinfli- I Fig. 6 is a view similar to Fig. 5, showing the position of the parts after the cleaner is con verted to attachment suction cleaning;

Fig. '7 is an enlarged section taken substantially on line VII-VII of Fig. 5;

3 A still further object of my invention is to produce a converting mechanism which is moved from qne'operating position to another by a simple endwise movement of the inner end of said attachment hose.

A still further object of my invention is to produce an, improved construction which includes locking means for retaining said converting mechanism against unintended movement from any operative position to which it may have been adjusted, together with means for insuring the return of the converting mechanism to the position it occupies while the cleaner is used for-floornozzle cleaning before the attachment hose can be disconnected from the cleaner. l

A still further object of my. invention is to produce a convertible cleaner which includes means for preventing conversion from floornozzle cleaning to attachment suction cleaning or Fig. 8 is a section on line VIII-VIII of Fig. 7;

Fig. 9 is a fragmentary and diagrammatic view, partly in vertical section and partly in elevation, of a cleaner embodying a modified form of my invention;.

Fig. 10 is an enlarged fragmentary horizontal section, showing the position of the parts when the cleaner is in floor-nozzle cleaning position;

Fig. 11 is a fragmentary horizontal section, showing the position of the parts when the cleaner is convertedto attachment blowing;

Fig. 12 is an enlarged -view of the right-hand portion of Fig. 11;

Fig. 13 is an enlarged fragmentary vertical sectional view, showing a still further modified form so of my invention; and

Fig. .14, is a section "n line X IVX1Y of Fig.

ferringto the drawings in detail more particularly to Fig. 1, I, show a suction cleaner blowing, unless the brush roll has first been so 20, mounted on wheels 22 and provided with a The cleaner 28 In the dust bag compartment 32 is a filter ba I 38, the inlet end of which communicates with the throat 38. The filter bag 38 may be removed for emptying through an opening in the casing (not shown). The cleaner also includes a compartment 48 which is provided with an outlet 44 The opening 44 formed in a wall 48 thereof. communicates with an opening 58 in a pendant wall 52. The opening 58 communicates with the atmosphere through an opening 54 the outer casing of the cleaner.

The cleaner also includes a suction-creating device 42 which is disposed in'the compartment :48. The suction-creating device is preferably formed in of the multi-stage type and is rotatable about a horizontal axis 43. The compartment 32 com- @municates'with the inlet of the suction-creating device through an opening which is not shown but which is indicated by the broken line arrow land the throat 38, by a valve 58. The valve 58 is biased by a spring 88 into position closing the passage 58. In the passage 58 is positioned a sembly are preferably concealed by a cover II8 secured to theltop wall 94 by screws II2. In several views, the cover I I8 is broken away so as to expose the lever and spring construction.

" When the adapter 88 is inserted into the slide 82, the end II4 thereof abuts against the shoulder I8. I f

In order to retain the slide 82 against accidental displacement while the cleaner is used for floor-nozzle cleaning, I provide a latching device II8 which is shown detached in Fig. 8. This device comprises ,a U-shaped member having side walls H8 and I28, there being a notch I22 inthe sidewall H8 and spaced notches or openings I24 and I28 in the wall I28. The side walls H8 and I28 define an elongated trough in which the lower end of the pendant latch I82 is adapted to move, as shown in Fig. 7. The side wall H8 is provided with a deflected guide extension I21 which, when the cleaner is inthe floor-nozzle cleaning position. forms a continuation of the slanting surface 88 (see Figs. 2 and 10) to guide and facilitate the insertion of the adapter 88 into the slide 82. The wall I28 is extended to form a shelf member I28 on which a latch member I38 is pivoted at I3I The latch member I38 is biased by a spring I82 in the direction of the arrow I33 :slide. 82, which includes a reduced inner portion I 184 having one side wall extended to form a finger 88, and an outer enlarged portion 88 separated from the reduced portion 84 by a shoulder I8.

:The slide 82 also carries a shutter I4 which, when the slide is in its outermost position, is adapted to abut against .the'wall 52 to close the opening 88. The abutment of the-shutter I4 against the right as viewed in Fig. 1, and thus prevents withdrawal of the slide from the passage 88.

The enlarged portion 88 of the slide 82 is provided with an opening I8 formed'in a side wall ,18, the outer end of which is beveled to form a slanting surface 88. As shown in Fig. 7, the lower portion 82 of the side wall 18 is made thinner than the upper portion thereof, thus providing "wall 52 limits the movement of the slide, to the attachment hose 92 (Fig. 4), the other end of which carries a suitable cleaning tool (not shown). Onthe top wall 94 of the adapter 88 is mounted a lever 98 which is fulcrumed at 98 and biased in the direction of the arrows 99 by a spring I88. The lever 98 terminates at one end thereof in a pendant latch member I82 and at the other end thereof in a, pendant grip portion I84. The pendant latch member I82 is adapted to be withdrawn, against the action of the spring I 88, into a seat or recess I88 formed in a side wall 188 of the adapter 88. The lever and spring as- (Fig. 3). One end of the spring I32 is conveniently anchored by a post I34 struck up from the top wall or shelf I28. The latching device II 8 is rigidly secured to the cleaner body in operative relation tothe' slide 82 and the adapter 88 by bolts or rivets I38 engaging a boss or other fixed portion of the body of the cleaner to one side of the passage 58.

The fan motor compartment 48 is provided with a bottom opening I38 which, in the position of the cleaner illustrated in Fig. 1, is closed by the top wall of the slide 82, but which,in the position of 40- the cleaner illustrated in'dotted lines in Fig. 4, is uncovered and communicates with the Open end of the slide 82 for a purpose hereinafter set forth.

The brush roll 34 is carried by an arm I48 which is biased upwardly by a spring I42. One end of the arm I48 is pivoted at I44 to a portion of the nozzle wall and the other end thereof is pivoted to the core of a solenoid I48. The solenoid I48 is connected by wires I48 to a switch I58. The switch I58 includes a button I52 which is norinally biased by a spring (not shown) to close the circuit and energize the solenoid I48. When entobring the lower end I88'of the lever I 54 into engagement with the latch I38, and out of contact'with the button I52, as shown in Fig. 2. The upper end I82 of'the lever I54 is adapted to be engaged by the lower portion of the handle 24, or by an extension I84 carried by the lower portion of the handle, and to be moved against the action of the spring I58 from the position shown in Fig. 2 into the position shown in Fig. 5, in which the lower end I88 of the lever I54 has been moved out of engagement with the latch I38 and into engagement with the button I52,- toopen the switch I58 and thus deenergize the solenoid I48. The switch .I 88 is so constructed and arranged that the button I52 is unaffected by movement of the handle 24 in its normal range of operation (Fig. l).

Operation-Figs. v1 and z y In the position shown in Figs. 1 and 2, the

- cleaner is adjusted for floor cleaning throughthe nozzle 26. In this position, the slide 62 is in a. central or intermediate position so that its end 88 suction device 42 travels through the nozzle 26, I

passage 28, throat 30, dust bag 36, into the fan compartment 40 through and out the openings 44, 60 and 54. The slide 62 is retained in this position by the latch I engaging in the opening 16 (Fig. 2). The latch I30 is locked minst un- When it is desired to convert the cleaner to attachment suction or ,attachment blowing, the cleaner handle 24 is moved from the acute angle position it occupies during floor-nozzle cleaning (Fig. 1), to a vertical or slightly over-vertical position (Fig. 4). In this position, the arm I64 engages the lever I54 and moves its lower end I60 from the position shown in Fig, 2, in which it locks the latch I30 against movement and in which position it is out of engagement with the button I52 of the normally closed switch I50, into the position shown in Figs. 5 and 6 in which the end limits the movement of the slide 62 and adapter I60 01 the lever I54 is disengaged from the latch opens the switch I50 to deenergize the solenoid I46. This insures the raising of the brush 34 by the spring I42, out of contactwith the surface being cleaned before the cleaner can be converted. The adapter 86 is now inserted into the slide 62 in the direction of the arrow I6I in Fig. 2.

When the latch I02 reaches a position in registration with the latch I 30, the latch I02,'being biased outwardly by the spring I00 which is stronger than the spring I32. pushes the latch I30 out of the opening 16 (Fig. 5). The slide 62 is now free of the latch I30, and the slide 62 and the adapter 86 are now latched together by engagement of the horizontal portion I68 of the lever 86 with the walls of the opening I6, and arefree to move as a unit with the lower portion or the latch I02 sliding in the trough provided between the walls I I8 and I20.

. Attachment suction cleaning 'If it is desired to use the cleaner for attachment suction cleaning, the slide 62 andadapter 86 are moved to the innermost position, shown in Figs. 4 and 6. In this position, the finger 66 of the slide 62 actuates the valve 56 from the position shown in Fig. 1 to that shown in Fig. 4, in which the door nozzle 26 is cut'ofi from the throat 30 and in which the throat 30 is now in communicationwith the interior of the passage 66, slide 62, adapter 86 and the attachment hose 82. In this position, the latch I02 is engaged in 6 the notch I24 to prevent accidental movement of the slide 62 and adapter 86. The air is now drawn into the dust bag 36 through the attachment hose 82 and is discharged through the openlugs 44, 60 and 64, asshown by the solid arrows in Fig. 4'.

Attachment blowing Assuming that it is desired to convert the cleaner from attachment suction cleaning to attachment blowing. it ismerely necessary to press the grip portion I04 of the lever 96 inwardly'to retract the latch I02 from the opening I24. Thereupon, the lower portion of the latch I02 can slide freely in the trough between the walls "8 and I20 01 the latching device H6, and the interlocked slide 62 and adapter 86 are moved outwardly or to the position shown in dotted lines in Fig. 4, and in full lines in Figs. 11 and 12, until the shutter 14' closes the opening and thus 86. The opening I38 is uncovered and communi cates with the passage 56, and the valve 58 closes the passage 56 from the throat 30. ,Air is now drawn by the suction device 42, through the nozzle 26, in the direction of the dotted arrows in Fig. 4, and Since the discharge opening 50 is closed by the shutter I4, the filtered air is disfloor cleaning. to attachment blowing, the slide 62 and adapter 86 are inserted as shown in Fig. 5, but instead of being moved inwardly to the position shown in Fig. 6, they are moved outw I wardly to the position shown in dotted lines in Fig. 4 and in solid lines in Figs. 11 and 12.

To reconvert the cleaner from either attachment suction or attachment blowing to floornozzle cleaning, the latch I02is withdrawn from the opening I24 or I26 and the slide and adapterare moved back as a unit to the central position illustrated in Fig. 5, in which the latch I02 may be retracted through the openings I22 and I6 by pressure on the grip I04 against action of the spring I00. Asthe latch I02 is retracted through the openings I22 and I6, the latch I 30 is biased by the spring I32 into the openin 16 in the wall I8 of the slide to lock the latter in'the intermedithe opening I6 in the slide 62, and the wall 8- prevents withdrawal of the latch through said ate or floor-nozzle cleaning position. The adapt- I er 86 may now be withdrawn from the slide 62.

It is to be noted that the construction is such that it is impossible for the operator to withdraw the adapter 86 without first bringing the adapter 86 and the slide 62 .to the intermediate or floor cleaning position of Fig. 5. This is so for the reason that the latch I02 extends through opening until the adapter and the slide are brought to the intermediate position in which the in which the lower end m of the lever in keeps the switch I68 open, regardless of the position of 3 the'handle 24, until the'slide 62 and adapter 86 have been returned to their intermediate position j and the adapter 86 has been. withdrawn from the slide 62. This insures ,thatthe brush roll 84 will remain raised out or contact with the surface on which the cleaner rests, as long as thecleaner is used for other than flcor-nomle cleaning.

I have thus devised a suction cleaner which is Figs. 9 to 12 In Figs. 9 to 12, I show a modified form oi construction in which the spring I42-and the solenoid I46 are omitted and in which the brush roll 84 is biased downwardly into contact with the sur- I face being cleaned, by a spring I69 acting upon a collar I18 fixed on an extension arm I12 of a bracket I14 pivoted at I16 and supporting the 1 brush roll 34. A rod or wire I18 is connected at .oneend to the bracket I14 at I88, and is secured 1 at I82 to a yoke I84 pivotedat I86. The other I end of the rod I18 is secured to a pin I88, which I is movable in a slot I98. The pin I88 is retained against tilting or withdrawal from the slot I98 I by any well-known means. The outer end of the pin I88 carries a yoke I94, which seats and guides the lower end of the handle 24 or of the extension I I64 carried by the lower portion of the handle.

operation -Figs. 9 to 12 When the handle is within its normal range I of operation, or substantially below vertical, the. arm I64 is out of contact with the pin I88 as I i a lug I94a carried by the latch I38. It is obvious that with the parts as shown in Fig. '10, the latch I88 cannot be disengaged from the opening 16 I in the slide 62, so that the slide 62 is immovable,

the latch I82 on the adapter 86 cannot enter 1 the opening 16 and cannot be latched to the slide 62. In other words, the cleaner cannot be converted. I

In order to convert the cleaner, it is necessary to,raise the handle 24 to the vertical position shown in solid lines in Fig. 9. The arm I64 now I engages the pin I88 and moves it in the slot I98,

to the right as viewed in Figs. 9 to 12. This moves the rod I18 in the direction of the arrow in Fig. 11, to tilt the bracket I14 about the pivot I16 and raise the brush roll 84. Simultaneously,

the end I92 of the pin I88 is moved outof alignment with the lug 194a on the latch I38, or from the position shown in Fig. 10 to the position shown in Figs. 11 and 12. The latch I38 can now be displaced from the opening 16 by the latch I82, to free the slide 62 from the latch I38 and to lock the slide 62 and adapter 86 for joint movement. 1 from one position to another, according to whether the cleaner is to be used for attachment suction cleaning or attachment blowing. When it assumes the position shown in Fig. 12 in which I the lug I941: of the latch I38 is disposed in the w The spring I69, acting upwardly on the collar pathoi movement of end 192 of the pin m. This prevents the return movement of the pin I88 and rod I18 by the action of the spring I69, regardless of the position of the handle 24; Therefore, the bracket I14'remains in its tilted position and the brush roll 34 remains raised.

Whenthe cleaner is reconverted to its normal floor-nozzle cleaning position and the latch I82 and the adapter 86 are withdrawn, the latch I88 is biased by the spring I32 into the opening 16 in the slide 62 and out of the path of the stop I92.

I18, tilts the bracket I14 in counterclockwise direction to lower the brush roll into contact with the surface being cleaned. The rod I18 and pin I88 now resume the position shown in Fig. 10.

Figs. 13 and 14 In Figs. 13 and 14, I show a still further modiflcation of the invention in which I provide the embodiment illustrated in Fig. 1, a barrier with plate I98 carried by a lever I98 The lever I98 is pivoted at 288 to a bracket or other flxedportiou on or of the cleaner body. The free end 282 of the lever I98 is movable vertically in a suitable opening 284. When the cleaner is used for floornozzle cleaning and with the handle in its normal range of operation, or at an angle of less than 98 from horizontal, the barrier plate I96 drops of its own weight into an opening 286 provided 7 282 of the lever I98, while the other end 2I4 of Figs. 13 and 14--Operation When the cleaner is used for floor-nozzle cleaning, the levers I98 and 288 assume the position shown in dotted lines in Fig. 14, with the barrier plate I96 in the opening 286 to prevent insertion of the adapter 86. In this position, the

' lever 288 is out of contact with the button I52,

I the latch I38'is displaced by the latch I82 from the opening 16 the side wall 18 0f the slide 51,

the switch I58, is closed, and the solenoid I46 is energized to bring the brush roll34 into contact with the surface to be cleaned, When it is desired .to convert the cleaner to attachment blowing or attachment, suction cleaning, it is necessary to raise the handle 24 to its vertical position to move the lever 288 by the extension arm 2I6' from the position shown in dotted lines,'to the position shown in solid lines in Fig. 14. In so doing, the end 2I2-of the lever 288 presses down onthe end 282 of the lever I98,:thus raising the barrier plate I96 out of the opening 286. The adapter 86 can now be inserted, locked to the slide 62, and moved from one position to another in the manner above explained. In its solid line position, the lever 288 presses down on the butthe barrier plate I98 drops into the opening 208 by its own weight and the cleaner is again ready ing device and connect said adapter and extenior floor-nozzle cleaning. As will be seen from Fig. 13, the barrier plate I88 is made relatively thick so as to more than counterbalance the weight of thelevers I88-and 208 beyond the pivot 200'.

The above described arrangement, whereby the sliding movement of the slide 82 controls the valve 58, the opening I38 and the opening 88, is claimed in my Patent No. 2,375,331. The integration of the adapter 88 with .the slide 82, as by means of the lever 88, in order to effect such sliding movement ofthe slide 82, is claimed in my copending application Serial No. 485,185.

While I have shown my invention in several forms, it will be obvious to those skilled in the art that it is not so limited, but is susceptible of various other changes and modifications without departing from the spirit thereof, and I desire, therefore, that only such limitations shall be placed thereupon as are specifically set forth in the appendedclaims.

What I claimis: v

l. A suction cleaner comprising a suction creating device, a floor nozzle, a wall structure defining a passage, a valve for selectively connecting said nozzle or said passage to the suction side of said suction-creating device, a member movable into a first and second position in said passage, an adapter connected .to an extension hose and insertable into said passage, latching means for integrating said adapter and said member for joint movement from one position to another within said passage, said adapter and said member being so constructed and arranged that the movement of said member from one to the other of its positions actuates said valve to shut'said nozzle ofi from the suction side of I said suction-creating device and to connect said adapter and extension hose thereto, a handle for propelling said cleaner, a movable barrier normally disposed in obstructing position operative to prevent integration of said adapter and said member, and means operable upon movement 01 said handle into a vertical position to remove said barrier from said obstructing position and permit integration of said member and said adapter,

2. The structure recited in claim 1, together with means urging said barrier for automatically returning said barrier to its obstructing position upon withdrawal of said adapter from said member and withdrawal of said handle from said vertical position. 7

3. A suction cleaner comprising a floor nozzle, a vertically adjustable agitator mounted therein and adapted to contact a surface to be cleaned, a suction-creating device, a wall structure defining a passage, a valve for selectively connecting said nozzle or said passage to the suction side of said suction-creating device, a member movable into a first and a second position in said passage, an adapter connected to a hose and insertable into said passage, latching. means for integrating said adapter and said member for joint movement from one position to the other within said-passage, said member being adapted upon being moved from one to the other of its positions to actuate said valve to shut said nozale 01! from the suction side of said suction-create sion hose thereto, a handle for propelling said cleaner, a movable barrier normally disposed in obstructing position operative to prevent integration of said adapter and said member, means operable by movement of said handle into a vertical position to remove said barrier from said obstructing position and permit integration oi said member and said adapter, and means operable by movement of said handle for elevating said agitator out of contact with said surface. 4. A suction cleaner comprising, a suctione creating device, a floor nozzle normally communicating with the suction side of said device, there being a first normally open outlet leading from the high-pressure side of said suction-creating device to the atmosphere, a wall structure defining a passage, a valve normally shutting said passage of! from the low pressure side oi said suction-creating device, there being asecond outlet leading from the high-pressure side of. said suction-creating device into said passage, a hollow open-ended slide movable in said passage to one intermediate and two end positions, said second outlet being normally closed by a wall, of said slide, an adapter connected to a hose and insertable into said slide, means for latching said adapter and said slide for joint movement, said said adapter and the high-pressure side of said suction-creating device, a barrier normally disposed in a position operative to obstruct move ment of said slide from its intermediate position, a handle for propelling said cleaner, and means operable by movement of said handle to move said barrier from its obstructing position to permit movement of said slide.

5. The combination with a suction cleaner 'including a suction-creating device having a, normally open outlet leading from the high-pressure side of said suction-creating device to the atmosphere, and a floor nozzle normally communieating with the suction side of said suction de-- pressure side of said suction-creating device,.

means operable by movement of said slide to its other end position to close said outlet and to connect said slide to the high-pressure side of said suction-creating device, locking means for retaining said slide in its intermediate position when the cleaner is used'for floor-nozzle cleaning, a hollow adapter connected to an attachment hose and insertable into said slide, means carried by said adapter for disengaging said looking means and for'integrating said slide and said adapter for joint movement from said intermediate position to either of said end positions, means ii for retaining said slide and said adapter in either of said end positions, a handle for propelling said cleaner, a barrier normally disposed in an obstructing position operative to prevent inte gration of said adapter and said slide, and means operable by movement of said handle into a vertical position to remove said barrier from its ob= structing position to permit integration of said slide and said adapter. g

6. The structure recited in claim 1 together withv means adapted, upon integration'oi said member and said adapter, to engage said barrier and to retain it out of its obstructing positionregardiess of the position of said handle.

7. A suction cleaner comprising a suction creating device, a floor nozzle normally communicating with the suction side of said suction creating device, a vertically movable agitator mounted in said nozzle, means forconverting said cleaner from floor-nozzle cleaning to attachment oper-' ation, barrier means normally disposed in an ta barrier means iii'its nonobetrnedne msition, ta

raise said agitator out of contact with said sur face, and means operable in response to 0011'? version of said cleaner-to attachment operation, to retain said barrier means in its nonobstructing position, in which said actuating means retains said agitator in its raised position, as long as said cleaner is converted to attachment operation, re= gardless of the position of said handle, said handie being freely movable independently of said barrier means.

8. Asuction cleaner asre'cited in claim 1 and further including agitator mounted "in the door nozzle, and means for raising the agitator in response to movement of the barrier to non-- obstructing position. t

CHARLES HZ TAYLOR.

REFERENCES CITED- The "following references are ofrecord in the file of this patent:

' UNITED S'I'A'I'ES'PATE NTS Number Name 'Date 2,148,656 Smellie Feb. 28, 1939 2,174,595 Pierce Qct. 3,1989

FOREIGNPATEN'IS Number Country Date I 373,199 German 1921

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