Floor scrubbing machine

[57] ABSTRACT

A compact floor scrubbing machine is provided. The floor scrubbing machine is relatively small, with a short length rendering the machine more easily manipulated or maneuverable than floor scrubbing machines heretofore known. A cleaning solution supply tank is mounted on a rear portion of the machine and motors are located forwardly thereof for driving the brushes of the machine and an exhaust blower. A removable recovery tank is located adjacent the two motors and partly thereabove, between the supply tank and the motors, so that maximum compactness is achieved for the machine. The recovery tank is easily separable from the rest of the machine and yet automatically seals with air passages for the exhaust blower and for a rear squeegee when placed on the machine.

Claims, 5 Drawing Figures

FOREIGN PATENTS OR APPLICATIONS

986,609 3/1965 Great Britain...........................15/353

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Patented May 23, 1972

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Sheets-Sheet 1

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Patented May 23, 1972

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Sheets-Sheet 'i

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Patented May 23, 1972

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Sheets-Sheet 3

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FIG. 2 ' INVENTOR. iJacL· L.

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3,663,985

FLOOR SCRUBBING MACHINE

This invention relates to a floor scrubbing machine and particularly to a floor scrubbing machine with a separable recovery tank.

Various floor scrubbing machines of the type having rotata- 5 ble scrub brushes and a water pick-up squeegee are known in the art. Such machines have tended to be expensive, cumbersome, heavy, and hard to manipulate. The present invention provides a compact, smaller, and lightweight floor scrubbing machine which is also less expensive and is easier to manipu- 10 late or operate. The new floor scrubbing machine has a water supply tank mounted adjacent the handle and a water recovery tank supported near the handle and located partly above motors which are used to drive the rotatable scrub brushes and an exhaust blower. Part of the recovery tank is ¹⁵also between the motors and the supply tank. The recovery tank has an opening communicating with an air inlet for the exhaust blower and another opening communicating with an air passage for a rear-mounted squeegee. The tank further has seals associated with the openings which automatically seal ²⁰when the recovery tank is positioned on the machine. The recovery tank also can be removed simply by raising a hinged lid, without any fasteners or clamps for the tank being required. Further, any baffles desired to direct air in the tank can be carried by the lid. 25

The floor scrubbing machine also has a unique mounting arrangement for the squeegee which can be readily manipulated by the operator’s foot between a retracted position and a floor-engaging position. This arrangement also enables the pressure of the squeegee on the floor to be readily adjusted. ³⁰

It is, therefore, a principal object of the invention to provide an improved floor scrubbing machine which is shorter and more compact than those heretofore known.

Another object of the invention is to provide a floor scrubbing machine with an improved separable water recovery tank.

A further object of the invention is to provide a floor scrubbing machine which is more easily manipulated and operated than those heretofore known.

Still a further object of the invention is to provide a floor scrubbing machine with an improved squeegee mounting arrangement.

Other objects and advantages of the invention will be apparent from the following detailed description of a preferred ₄₅embodiment thereof, reference being made to the accompanying drawings, in which:

FIG. 1 is a somewhat schematic view in perspective of a floor scrubbing machine embodying the invention;

FIG. 2 is an enlarged side view in elevation of the floor 50 scrubbing machine of FIG. 1;

FIG. 3 is a fragmentary, exploded view in perspective of a water recovery tank and associated components of the floor scrubbing machine;

FIG. 4 is an enlarged, rear view in perspective of a squeegee mounting arrangement for the floor scrubbing machine, with parts broken away; and

FIG. 5 is a somewhat schematic side view in elevation of a rear portion of the machine, showing the squeegee in the retracted position.

Many floor scrubbing machines are known in the art in which cleaning solution is supplied through one or more rotatable brushes located at the front of the machine. The brushes scrub the floor with the cleaning solution and, as the machine moves forwardly, the cleaning solution remaining on the floor behind the brushes is picked up by a squeegee, with the aid of a vacuum, at the rear of the machine. These machines heretofore known have usually been of large, boxy construction and usually supported on four wheels. The machines were hard to manipulate, costly, and difficult to 70 move from one location to another because of their size and weight.

Referring to the drawings, a compact floor scrubbing machine according to the invention is indicated at 10. This machine is shorter and lighter than those heretofore known 75 and is relatively easy to manipulate on two rear wheels and a caster. The machine includes a supporting frame generally indicated at 12 (FIG. 2) including a rear supporting member 14 and a forward supporting member 16. The rear member 14 has an upper wall 18 forming a supporting platform and side walls 20 which receive an axle 22 for wheels 24 at a lower portion thereof. The front supporting member 16 has an upper wall 26 forming a supporting platform and has a flexible splash skirt 28 depending therefrom around the sides and front of the platform 26. A front caster 29 also is pivotally supported from the upper wall 26.

A handle post 30 (FIG. 4) extends through the upper wall 18 of the rear supporting member 14 and is received on the axle 22. At the upper end of the handle post 30 is a panel 32 carrying a switch 34 (FIG. 1) for a brush motor and a switch 36 or an exhaust blower motor. Two handles 38 extend outwardly from the panel 32 with a valve control lever 40 mounted under one of the handles 38.

As shown in FIG. 1, a link 42 extends downwardly from the handle 40 and connects with a lever 44 of a supply valve 46. The supply valve 46 is mounted below the wall 18 of the rear supporting member 14 and has a pipe extending thereabove into communication with a supply tank 48 which is supported on the member 14 and is also partly supported by the handle post 30. The supply tank 48 in this instance has a capacity of 3½ gallons of cleaning solution. As shown schematically in FIG. 1, a supply tube SO extends from the valve 46 downwardly below the platform 26 and to branch tubes 52 and 54 terminating above rotatable scrub brushes 56 and 58. The cleaning solution supplied to the brushes 56 and 58 is readily controlled by the operator through the handle 40, the link 42, and the control lever 44 which opens and closes the valve 46.

The brushes 56 and 58 are driven through an electric motor 60 (FIGS. 2 and 3) which is mounted on a gear reduction box 62. The gear reduction box 62 in turn is supported on the platform 26 and has drive shafts (not shown) extending therebelow which are suitably connected to the brushes 56 and 58 in a conventional manner. The specific drive for the brushes 56 and 58 does not constitute part of the instant invention.

The cleaning solution supplied from the supply tank 48 is applied to the surface by the brushes 56 and 58 and remains behind the brushes as the machine 10 moves forwardly. Substantially all of the cleaning solution is then picked up from the surface by a rear squeegee 64. The construction of the squeegee, per se, is known in the art. It includes a long mounting member 66 (FIG. 4) from which a forward flexible blade 68 and a rear squeegee blade 70 depend. The member 66 and the blades 68 and 70 form a partially enclosed chamber but with the ends of the squeegee open between the blades 68 and 70 to enable air to be drawn longitudinally therethrough into a 55 central manifold portion 71. From the manifold 71, the air is exhausted through a spout or nipple 72 which, in turn, is connected to a flexible hose 74 and to an additional nipple 76 (FIG. 3) mounted on the forward supporting member 16. The nipple 76 communicates with a passage 78 formed by a sheet metal member in cooperation with the supporting member 16, the passage 78 connecting the nipple 76 with an opening 80 in the platform 26 of the supporting member 16.

The air and cleaning solution are drawn into a recovery tank indicated at 82 and to an exhaust blower 84 driven by a motor 65 86 which is located to one side of the brush motor 60. The cleaning solution is retained in the recovery tank 82 and the air is expelled downwardly from the blower 84 and dissipates from the machine. The blower 84, of a known design, is supported on a front supporting member 88 with a gasket 90 therebetween, the member 88 having an upper wall 92 with an opening 94 through which the blower motor 86 extends. The blower 84 further has a central upper inlet opening 96 which receives the air from the recovery tank 82.

Referring particularly to FIG. 3, the recovery tank 82 has a lower bottom wall 98 and an upper bottom wall 100 which are

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4 connected by a slanted wall 102. The tank further has side walls 104 and 106 between which extends a handle rod 108 which facilitates carrying and emptying of the tank 82. The bottom wall 98 has an opening 110 therein upwardly from which extends an inlet air tube 112 terminating in an upper slanted end 114 near the upper edges of the side walls 104 and 106 of the tank. The opening 110 is in alignment with the opening 80 in the platform 26 when the tank 82 is mounted on the machine. A gasket 116 is located around the openings 80 and 110 and provides an air-tight connection therebetween.

The upper bottom wall 100 is located above the motors and has a lower outlet opening 118 therein, upwardly from which extends an air outlet tube 120 terminating near the upper edges of the side walls 104 and 106 and generally at the level of the upper end of the air inlet tube 112. With the tank on the machine, the outlet opening 118 is aligned with the blower inlet opening 96, with a gasket or sealing ring 122 therebetween to provide an air-tight connection. The sealing rings 116 and 122 are compressed somewhat under the weight of the tank 82 when placed thereon to provide more effective seals.

A front cover or hood 124 extends around the forward portions of the side of the machine and the front thereof to enclose the motors 60 and 86 and the blower 84, along with a front portion of the recovery tank 82. A lid 126 is connected to the upper front edge of the cover 124 by a piano-type hinge 128. The lid 126 includes a top 130 which prevents the possibility of splashing of the recovery solution in the tank 82 and has a gasket (not shown) sealing with the edges ofthe tank to provide an air-tight chamber in the tank. The lid also has side flanges 132 which extend over the side walls 104 and 106 of the tank to aid in retaining the tank 82 in position on the machine, in cooperation with the cover 124. A rear baffle 134

The springs 150 are under tension and urge the forward portions of the lever arms 42 upwardly when the squeegee 64 is in the operating position, as shown in FIG. 4. The rear of the arms 142 are thereby urged downwardly, pivoting about the 5 axle 22. The degree of tension on the springs 150, as controlled by the wing nuts 156, thereby can determine the extent of pressure of the squeegee blade on the surface.

When the squeegee 64 is raised to the retracted position, which can be accomplished easily by the operator’s toe, the ¹⁰ springs 150 are still under tension and the end openings 146 are actually moved downwardly to the point where the tension of the springs 150 acts on a line below the axle 22 (FIG. 5). This is made possible by the curved rods 148 which clear the axle 22 when the squeegee is raised so that lines extending ¹⁵ between the end openings 146 and the tabs 154 pass slightly below the axle 22. Consequently, the spring tension in this instance tends to move the lever arm 142 further in a clockwise direction, as viewed in FIG. 5, and maintains the squeegee 64 in the upper position.

A latch 158 can be employed to engage one of the lever arms 142 when the squeegee is in the upper position to further assure maintenance of the squeegee in that position, if desired. The operator can then easily move the squeegee to the operat₂₅ ing position by downward pressure on the squeegee with the springs 150 then aiding to move the squeegee downwardly as the lines between the openings 146 and the tabs 154 pass once again above the axle 22.

Various modifications of the above described embodiment of the invention will be apparent to those skilled in the art and it is to be understood that such modifications can be made without departing from the scope of the invention, if they are within the spirit and the tenor of the accompanying claims.