FIELD OF THE INVENTION The present invention relates to a device for cleaning carpets or hard surfaces, and in particular relates to a round brush which is preferably pushed over the surface of a carpet or hard surface to agitate and/or expel a debris-laden cleaning solution that has been previously applied to the carpet or hard surface to accomplish chemical cleaning.

BACKGROUND OF THE INVENTION Many devices exist in the art for cleaning carpets and hard surfaces, and many devices utilize brushes to accomplish the removal of cleaning solutions which have been previously applied to a carpet or hard surface to accomplish chemical cleaning.

However, none of the devices in the prior art provides a round brush which may be locked in place as the user manually pushes the brush to remove the chemical cleaning solution, and which may optionally be unlocked to permit the exposure of a different portion of the surface area of the brush to the surface.

The present invention solves this problem by providing a brush with a round surface area that is preferably pushed over the surface of a carpet or hard surface to agitate and/or expel a debris-laden cleaning solution that has been previously applied to accomplish chemical cleaning of the surface and subsurface. The brush can be configured to travel over the surface by the use of wheels which rotate around an axle. When configured with an axle, the brush is optionally rotatable, and may be locked in place to accomplish the cleaning operation and then unlocked to permit the exposure of a different portion of the surface area of the brush to the surface. Alternately the brush can be configured to eliminate the axle, while at the same time retaining the wheels (which do not rotate absent the axle) to provide a uniform clearance between the brush surface and the cleaned surface regardless of the downward pressure applied to the brush.

The brush design of the present invention provides many advantages over prior art manually operated push brush designs. The brush can be used on any surface, including soft or hard surfaces, and carpeted or uncarpeted surfaces. The use of wheels enables more consistent cleaning than prior art brush designs due to the constant pressure applied to the brush bristles and the uniform clearance between the bristles and the surface that is created by the wheels as the bristles contact areas both on and below the exposed surface.

The constant clearance created by the use of wheels reduces bristle fatigue by ensuring that the bristles do not bend as pressure is applied to the brush, and this clearance also ensures that the brush will effectively work on both forward and backward strokes without catching on or hopping over a portion of the cleaned surface. When configured with an axle, the ability to periodically shift to an unexposed surface area of the brush also causes less bristle fatigue for a given carpet or hard surface area covered and providing better carpet or floor surface depth penetration for a given amount of user effort due to the rounded design of the brush. Finally, the wheel (or alternately the axle, bearing and wheel) configuration permits greater ease in changing bristle varieties to accommodate various carpet or hard surface textures. The present invention also provides many advantages over prior art electro-mechanical scrubbing devices, such as providing portability and cost economy through elimination of the need for an external source of power.

Accordingly, it is an object of the present invention to provide a cleaning brush with a round surface area that is preferably pushed over the surface of a carpet or hard surface.

It is also an object of the present invention to provide a cleaning brush with a round surface area that is preferably pushed over the surface of a carpet or hard surface to agitate and/or expel a debris-laden cleaning solution that has been previously applied to accomplish chemical cleaning.

It is also an object of the present invention to provide a cleaning brush with a round surface area that is preferably pushed over the surface of a carpet or hard surface which is optionally rotatable, and which may be locked in place to accomplish the cleaning operation and then unlocked to permit the exposure of a different portion of the surface area of the brush.

It is also an object of the present invention to provide a cleaning brush with a round surface area that is preferably pushed over the surface of a carpet or hard surface to enable more consistent cleaning than prior art brush designs due to constant contact of the brush bristles with areas both on and below the exposed surface of the carpet or hard surface and the ability to periodically shift to an unexposed surface area of the brush.

It is also an object of the present invention to provide a cleaning brush with a round surface area that is preferably pushed over the surface of a carpet or hard surface which causes less bristle fatigue than prior art brush designs for a given carpet or floor surface area covered and which provides better carpet or hard surface depth penetration than prior art brush designs for a given amount of user effort.

It is also an object of the present invention to provide a brush with a round surface area that is preferably pushed over the surface of a carpet or hard surface which permits greater ease in changing brush sizes and bristle varieties to accommodate various carpet or hard surface textures.

It is also an object of the present invention to provide a brush with a round surface area that is preferably pushed over the surface of a carpet or over a hard surface which provides portability and cost economy through elimination of the need for an external source of power.

SUMMARY OF THE INVENTION The push brush carpet and hard surface cleaner of the present invention is preferably comprised of a cleaning brush with a round surface area to which cleaning bristles of any conventional size and shape are attached. The brush is preferably attached to wheels to ensure a uniform clearance between the brush surface and the cleaned surface. Alternately, the brush may be attached to a frame by use of an axle, wheel and bearing configuration which permits locking of the axle in place at a given rotary position of the brush and also unlocking of the axle to permit rotation of the brush to a different position.

In use, a portion of the brush surface will come in contact with the carpet or hard surface as the user pushes the brush in a reciprocating manner. In so doing, debris on the surface will be agitated and/or expelled by the contacted area of the brush surface (in the case of a carpeted or other fibered surface, the fibers would be lifted to accomplish this).

After one area of the brush surface has been exposed to debris, the axle, bearing and wheel configuration permits unlocking, rotation and re-locking of the brush to permit a different portion of the brush surface to contact the surface. Alternately, with or without an axle, the opposite side of the brush may be used to eliminate the need for rotation of the brush. In practice the brush is preferably pushed over the surface of a carpet or a hard surface to agitate and/or expel a debris-laden cleaning solution that has been previously applied to accomplish chemical and/or mechanical cleaning. The cleaning solution can be any dry or wet conventional chemical solution suitable for the purpose of cleaning, but the brush of the present invention is preferably used for carpet cleaning in conjunction with a dry powder or substantially neutral Ph dry crystalline formula cleaning solution. Finally, the wheel (or alternately the axle, bearing and wheel) configuration permits easy disassembly of the brush to allow easy replacement or cleaning of the brush and to permit accommodation of various brush sizes and bristle varieties.

Other details, objects, and advantages of the present invention will become apparent in the following description of the presently preferred embodiments.

BRIEF DESCRIPTION OF THE DETAILED DRAWINGS Figure 1 is an overhead view of an embodiment of the push brush cleaner of the present invention as configured without an axle, taken in a direction perpendicular to the axis of the brush; Figure 2 is an overhead view of an embodiment of the push brush cleaner of the present invention as configured without an axle, taken in a direction parallel to the axis of the brush; Figure 3 is an overhead view of an embodiment of the push brush cleaner of the present invention as configured with an axle, taken in a direction perpendicular to the axis of the brush; Figure 4 is an overhead view of an embodiment of the push brush cleaner of the present invention as configured with an axle, taken in a direction parallel to the axis of the brush; DETAILED DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENT As shown in Figures 1 through 4, the push brush cleaner of the present invention is preferably comprised of a cleaning brush 1 with a round surface area to which cleaning bristles 2 of any desired size and shape are attached. As shown in Figures 1 and 2, the brush 1 is preferably bolted directly to wheels 5 without an axle. In this embodiment, the wheels 5 do not rotate, but are used to provide a constant and uniform clearance between the bristles 2 and the cleaned surface. In an alternate embodiment shown in Figures 3 and 4, the brush 1 is attached to a frame 3 by use of an axle 4 running axially through the center of the brush, such as a conventional hexagonal axle, and attached to the axle 4 are wheels 5 that each preferably contain a bearing 6 inside which an end of the axle 4 rotates and which permits locking of the axle 4 in place at a given rotary position of the brush 1 along with unlocking of the axle 4 to permit rotation of the brush 1 to a different position. Although the use of wheels 5 is preferred due to the improved cleaning which is caused by the consistent amount of clearance between the brush surface 1 and the cleaned surface created by the wheels 5, the present invention will also accomplish its intended purpose without the use of wheels. Preferably attached either directly to the brush 1 or to the frame 3 is a handle 7 which is gripped by the user as the brush 1 is pushed over the surface of a carpet or hard surface.

In use, the non rotating brush 1 of Figures 1 and 2 is pushed over the cleaned surface such that at least a portion of the brush surface 1 will come in contact with the carpet or hard surface as the user pushes the brush across an area of the carpet or surface, preferably in a reciprocating motion which causes the brush 1 to travel on the wheels 5 in a direction substantially perpendicular to the axis of the brush 1. In so doing, debris on and/or below the exposed surface of the carpet or hard floor will be agitated and/or expelled by the contacted area of the brush surface 1 due to the friction created by the coarseness of the bristle pattern 2. In the rotary embodiment of the brush 1 shown in Figures 3 and 4, the brush 1 is locked in place in a given rotary position by the user and is rotated after one area of the brush surface 1 has been exposed to debris. The axle 4, bearing 6 and wheel 5 configuration of the embodiment shown in Figures 3 and 4 permits unlocking and rotation of the brush 1 to permit a different portion of the brush surface 1 to contact the surface, so that the brush 1 may be locked in place in this new rotary position to accomplish the cleaning operation with an unexposed portion of the brush surface 1.

In practice the brush 1 is preferably pushed over the surface to agitate and/or expel a debris-laden cleaning solution 8 that has been previously applied to the surface to accomplish chemical cleaning. The cleaning solution 8 can be any conventional chemical solution suitable for the purpose of cleaning carpets or floors or other hard surfaces, but the brush 1 of the present invention is preferably used for carpet cleaning in conjunction with a dry powder or substantially neutral Ph dry crystalline formula cleaning solution such as the Crystal Dry carpet cleaning agent manufactured by the R. E. Whittaker Company. Finally, the bolting of the wheels 5 directly to the brush as shown in Figures 1 and 2 permits easy disassembly of the brush 1 to permit easy replacement of the brush 1 and to allow accommodation of various brush sizes and bristle varieties, as does the axle 4, bearing 6 and wheel 5 configuration alternately shown in Figures 3 and 4.

While presently preferred embodiments of practicing the invention have been shown and described with particularity in connection with the accompanying drawings, the invention may otherwise be embodied within the scope of the following claims: