Floor cleaning apparatus

• US 5,485,653 A
• Filed: 04/25/1994
• Issued: 01/23/1996
• Est. Priority Date: 04/25/1994
• Status: Expired due to Term

• Current Assignee: Karcher North America Incorporated (Alfred Kärcher SE & Co. KG)
• Original Assignee: Windsor Industries Incorporated (Alfred Kärcher SE & Co. KG)
• Inventors: Strickland, Timothy A., O'Hara, Robert J., Knowlton, Christopher M.
• Primary Examiner(s): Scherbel, David
• Assistant Examiner(s): ALEXANDER, REGINALD
• Application Number:
  US08/233,014
• Time in Patent Office: 638 Days
• Field of Search: 15/340.1, 15/340.3, 15/340.4, 15/320, 280/771, 280/93, 280/95.1, 280/98, 280/103
• US Class Current: 15/340.4
• CPC Class Codes: A47L 11/24 Floor-sweeping machines, motor-driven
• CPC Class Codes: A47L 11/29 Floor-scrubbing machines characterised by means for taking-up dirty liquid
• CPC Class Codes: A47L 11/293 the tools being disc brushes
• CPC Class Codes: A47L 11/30 by suction
• CPC Class Codes: A47L 11/302 having rotary tools
• CPC Class Codes: A47L 11/4044 Vacuuming or pick-up tools; Squeegees
• CPC Class Codes: A47L 11/4061 Steering means; Means for avoiding obstacles; Details related to the place where the driver is accommodated

Abstract

The present invention provides an apparatus for cleaning floors. In one embodiment, the apparatus includes four wheels, two of which are steerable wheels, and a steering mechanism that permits the two steerable wheels to turn to a degree that allows very tight turns to be made by the sweeper. In another embodiment, the apparatus is a sweeper with a cylindrical side broom. Yet a further embodiment of the sweeper includes flaps or seals that form a skirt about the broom and a mounting mechanism for slidably receiving the flap or seal. In a further embodiment, the apparatus is a sweeper that employs flaps with wear indicators that tell an operator when to adjust or replace the flap. In another embodiment, the apparatus is a sweeper that utilizes a pre-filter to remove debris that remains in the vacuum airstream after having passed through the hopper and that is of a size that can require frequent cleaning of a subsequent filtering device. In yet a further embodiment, the apparatus is a scrubber with two counter rotating disk brushes, a primary squeegee, and a second or pre-squeegee for relieving the primary squeegee from processing the heavier concentration of wastewater produced in the area between the brushes. In yet another embodiment, the apparatus is a scrubber that includes a squeegee mounting systems that is relatively easy to use and permits the squeegee rubber to extend beyond the end of the mounting structure.

Claims

1. A apparatus for cleaning a surface comprising:

a frame;

means, operatively attached to said frame, for cleaning a surface;

four wheels for use in moving said frame and said means for cleaning over a surface, wherein each of said four wheels is operatively connected to said frame and said four wheels includes a first pair of non-steerable wheels and a second pair of steerable wheels; and

means for steering said second pair of wheels that, when used to turn said second pair of wheels, can cause at least one of said second pair of wheels to turn more than about 45°

so that tight turns can be made by the apparatus;

wherein said means for steering includes the following;

a first wheel arm that is operatively connected to one of said second pair of wheels and rotatable about a first wheel pivot point;

a second wheel arm that is operatively connected to the other of said second pair of wheels and is rotatable about a second wheel pivot point that is different than said first wheel pivot point;

a first steering arm that is rotatable about a first steering pivot point;

a second steering arm that is rotatable about a second steering pivot point that is different than said first steering pivot point;

a first link pivotally connected to said first wheel arm and said first steering arm;

a second link pivotally connected to said second wheel arm and said second steering arm; and

a third link pivotally connected to said first steering arm and said second steering arm.

2. An apparatus, as claimed in claim 1, wherein:

said means for steering can cause at least one of said second pair of wheels to turn more than about 75°

.

3. An apparatus, as claimed in claim 1, wherein:

said means for steering can cause at least one of said second pair of wheels to turn more than about 90°

.

4. An apparatus, as claimed in claim 1, wherein:

said means for steering, when used to turn said second pair of wheels, causes said second pair of wheels to turn substantially simultaneously but at different rates.

5. An apparatus, as claimed in claim 1, wherein:

said first pair of wheels is located so that the planes of said first pair of wheels are substantially parallel to one another and so that a first line that passes through the centers of said first pair of wheels is also substantially perpendicular to the planes of said first pair of wheels;

said means for steering, when used to turn said second pair of wheels so that the planes of said pair of wheels are not substantially parallel to one another, can cause each wheel to turn so that a pair of center lines, each passing through the center of one of the second pair of wheels and substantially perpendicular to the plane of said one of said second pair of wheels, substantially converge at a point on said first line.

6. An apparatus, as claimed in claim 5, wherein:

said point on said first line is located outside of the portion of said first line extending from one of said first pair of wheels to the other of said first pair of wheels.

7. An apparatus, as claimed in claim 5, wherein:

said point on said first line is located between said first pair of wheels.

8. An apparatus, as claimed in claim 1, wherein:

at least one of said first pair of wheels is a drive wheel.

9. An apparatus, as claimed in claim 1, wherein:

at least one of said second pair of wheels is a drive wheel.

10. An apparatus, as claimed in claim 1, wherein:

said first steering arm includes a Pitman arm.

11. An apparatus, as claimed in claim 1, wherein:

both of said first steering arm and said second steering arm include a Pitman arm.

12. An apparatus, as claimed in claim 1, wherein:

said first steering arm includes a Pitman arm, wherein said Pitman arm is rotatable about said first steering pivot point, and said Pitman arm is pivotally connected to said first link at a first pivotal connection point and to said third link at a second pivotal connection point;

wherein said first steering pivot point, said first pivotal connection point, and said second pivotal connection point define a triangle.

13. An apparatus, as claimed in claim 1, further comprising:

means for floating said second pair of wheels relative to said frame.

14. An apparatus, as claimed in claim 1, wherein:

said means for cleaning includes a first cylindrical broom that, when in operation, rotates about an axis that is substantially parallel to the surface.

15. An apparatus, as claimed in claim 1, wherein:

said means for cleaning includes a first broom that is substantially located within a first area bounded by an exterior body of the apparatus; and

a second broom that, when in use, rotates about an axis that is substantially parallel to said surface and that is located in a second area that is outside of said first area.

16. An apparatus, as claimed in claim 15, wherein:

said first broom, when in use, rotates about an axis that is substantially parallel to said surface.

17. An apparatus, as claimed in claim 15, wherein:

said means for cleaning includes means for selectively positioning said second broom in a plane substantially parallel to said surface.

18. An apparatus, as claimed in claim 15, wherein:

said means for cleaning includes means for permitting said second broom to rotate about a vertical axis relative to said surface.

19. An apparatus, as claimed in claim 15, wherein:

said means for cleaning includes means for displacing said second broom away from said surface.

50. An apparatus, as claimed in claim 1, wherein:

said first steering arm includes a Pitman arm, wherein said Pitman arm is rotatable about said first steering pivot point, and said Pitman arm is pivotally connected to said first link at a first pivotal connection point and to said third link at a second pivotal connection point;

wherein said first pivotal connection point is located at a first radius from said first steering pivot point;

wherein said second pivotal connection point is located at a second radius from said first steering pivot point that is different than said first radius.

20. An apparatus for cleaning a surface comprising:

a frame;

means, operatively attached to said frame, for cleaning a surface;

four wheels for use in moving said frame and said means for cleaning over a surface, wherein each of said four wheels is operatively connected to said frame and said four wheels includes a first pair of non-steerable wheels and a second pair of steerable wheels; and

means for steering said second pair of wheels that, when used to turn said second pair of wheels, can cause at least one of said second pair of wheels to turn more than about 45°

so that tight turns can be made by the apparatus;

wherein said means for cleaning includes a flap; and

means for mounting said flap to said frame;

wherein said flap includes an upper edge having a first thickness and a lower edge having a second thickness that is less than said first thickness;

wherein said means for mounting includes a first longitudinal extending slot for holding said flap, said slot having an upper portion with a first width that can accommodate said first thickness of said upper edge of said flap and a lower portion with a second width that can accommodate said second thickness of said lower edge but cannot accommodate said first thickness of said upper edge of said flap so that when said flap is mounted in said first longitudinally extending slot, said flap is prevented from moving in a direction from said upper portion towards said lower portion of said first longitudinally extending slot;

wherein said flap can be slidably inserted into and slidably removed from said slot.

21. An apparatus, as claimed in claim 20, wherein:

said means for mounting includes a second longitudinally extending slot that is located adjacent to and in communication with said lower portion of said first slot to aid in slidably displacing said flap in said first slot.

22. An apparatus for cleaning a surface comprising:

a frame;

means, operatively attached to said frame, for cleaning a surface;

four wheels for use in moving said frame and said means for cleaning over a surface, wherein each of said four wheels is operatively connected to said frame and said four wheels includes a first pair of non-steerable wheels and a second pair of steerable wheels; and

means for steering said second pair of wheels that, when used to turn said second pair of wheels, can cause at least one of said second pair of wheels to turn more than about 45°

so that tight turns can be made by the apparatus;

wherein said means for cleaning includes a flexible, substantially planar member that includes a first terminal edge and a second terminal edge, wherein when said flexible, substantially planar member is in use, said first terminal edge contacts said surface and said second terminal edge is operatively connected to said frame and separated from said surface;

wherein said flexible, substantially planar member includes a wear indicator located between said first and second terminal edges and, prior to any wear of said first terminal edge, separated from said first terminal edge.

23. An apparatus, as claimed in claim 22, wherein:

said wear indicator includes a longitudinally extending bulb that located substantially parallel to said first terminal edge.

24. An apparatus, as claimed in claim 22, wherein:

said wear indicator is a different color from an adjacent portion of said flexible, substantially planar member.

25. An apparatus, as claimed in claim 22, wherein:

said flexible, substantially planar member includes one of the following;

a flap and a squeegee.

26. An apparatus for cleaning a surface comprising:

a frame;

means, operatively attached to said frame, for cleaning a surface;

four wheels for use in moving said frame and said means for cleaning over a surface, wherein each of said four wheels is operatively connected to said frame and said four wheels includes a first pair of non-steerable wheels and a second pair of steerable wheels; and

means for steering said second pair of wheels that, when used to turn said second pair of wheels, can cause at least one of said second pair of wheels to turn more than about 45°

so that tight turns can be made by the apparatus;

wherein said means for cleaning includes a hopper for receiving a debris laden airstream, precipitating first heavier debris from said debris laden airstream, collecting said first heavier debris, and providing a first exit airstream that may contain lighter debris;

a pre-filter for receiving said first exit airstream, precipitating out second heavier debris that is generally lighter than said first heavier debris from said first exit airstream, collecting said second heavier debris, and providing a second exit airstream that may contain lighter debris; and

a filter for receiving said second exit airstream, precipitating out third heavier debris that is generally lighter than said first and second heavier debris from said airstream, collecting third heavier debris and providing a third exit airstream that is substantially free of debris;

wherein said pre-filter includes vanes for creating a vortex.

27. An apparatus, as claimed in claim 26, wherein:

said means for cleaning includes a rotating broom.

28. An apparatus, as claimed in claim 26, wherein:

said pre-filter includes means that moves in response to said first exit airstream.

29. An apparatus, as claimed in claim 26, wherein:

said pre-filter includes a vaned wheel.

30. An apparatus, as claimed in claim 26, wherein:

said pre-filter includes a wheel with a cup, wherein upon rotation of said cup, said cup directs said second heavier debris to a means for collection.

31. An apparatus, as claimed in claim 26, wherein:

said filter includes a pleated panel filter.

32. An apparatus, as claimed in claim 26, wherein:

said hopper includes a first portion for collecting said first heavier debris and a second portion for collecting said second heavier debris that is separate from said first portion.

33. An apparatus for cleaning a surface comprising:

a frame;

means, operatively attached to said frame, for cleaning a surface;

four wheels for use in moving said frame and said means for cleaning over a surface, wherein each of said four wheels is operatively connected to said frame and said four wheels includes a first pair of non-steerable wheels and a second pair of steerable wheels; and

means for steering said second pair of wheels that, when used to turn said second pair of wheels, can cause at least one of said second pair of wheels to turn more than about 45°

so that tight turns can be made by the apparatus;

wherein said means for cleaning includes a first disk brush for scrubbing a floor and that rotates in a clockwise direction about a first vertical axis;

a second disk brush, located adjacent to said first disk brush, for scrubbing said floor and that rotates in a counter-clockwise direction about a second vertical axis;

wherein, during operation of said first and second disk brushes, a stream of wastewater is produced behind said first and second disk brushes, said stream of wastewater is heavier in an area between said first and second vertical axes and lighter elsewhere;

a first squeegee located behind said first and second disk brushes to collect said wastewater; and

a second squeegee located between said first and second disk brushes and said first squeegee, and located to collect at least a portion of the heavier stream of wastewater so that more wastewater is collected.

34. An apparatus, as claimed in claim 33, wherein:

said first squeegee is located substantially parallel to said second squeegee.

35. An apparatus, as claimed in claim 33, wherein:

said first squeegee has a first length and said second squeegee has a second length that is less than said first length.

36. An apparatus, as claimed in claim 33, wherein:

said first squeegee is located substantially parallel to said second squeegee, and said first squeegee has a first length and said second squeegee has a second length that is less than said first length.

37. An apparatus, as claimed in claim 33, wherein:

said second squeegee includes a trap to collect solid debris contained in the wastewater.

38. An apparatus, as claimed in claim 33, wherein:

said second squeegee includes a drain to permit wastewater to be returned to the surface.

39. An apparatus, as claimed in claim 33, wherein:

said second squeegee includes a drain located to permit wastewater to be returned to the surface at a location that permits said second squeegee to again collect the wastewater.

40. An apparatus, as claimed in claim 33, wherein:

said second squeegee includes a trap to collect solid debris and a drain to permit wastewater to exit said trap.

41. An apparatus, as claimed in claim 33, wherein:

said second squeegee includes a trap to collect solid debris and a drain located to permit wastewater to be returned to the surface at a location that permits said second squeegee to again collect the wastewater.

42. An apparatus, as claimed in claim 33, wherein:

at least one of said first squeegee and said second squeegee includes a vacuum squeegee.

43. An apparatus, as claimed in claim 33, wherein:

both of said first squeegee and said second squeegee include a vacuum squeegee.

44. An apparatus for cleaning a surface comprising:

a frame;

means, operatively attached to said frame, for cleaning a surface;

four wheels for use in moving said frame and said means for cleaning over a surface, wherein each of said four wheels is operatively connected to said frame and said four wheels includes a first pair of non-steerable wheels and a second pair of steerable wheels; and

means for steering said second pair of wheels that, when used to turn said second pair of wheels, can cause at least one of said second pair of wheels to turn more than about 45°

so that tight turns can be made by the apparatus;

wherein said means for cleaning includes a squeegee mount that has a first squeegee mount end, a second squeegee mount end, a squeegee mount top edge, a squeegee mount bottom edge, a squeegee mount side surface that extends from said first squeegee mount end to said second squeegee mount end and from said squeegee mount top edge to said squeegee mount bottom edge;

a squeegee rubber that includes a first squeegee rubber end, a second squeegee rubber end, a squeegee rubber top edge, a squeegee rubber bottom edge, a first squeegee rubber side surface that extends from said first squeegee rubber end to said second squeegee rubber end and from said squeegee rubber top edge to said squeegee rubber bottom edge, and a second squeegee rubber side surface that extends from said first squeegee rubber end to said second squeegee rubber end and from said squeegee rubber top edge to said squeegee rubber bottom edge;

wherein one of said squeegee mount side surface and said first squeegee rubber side surface includes a crown and the other of said squeegee mount side surface and said first squeegee rubber side surface includes a first longitudinally extending slot dimensioned to fit over said crown and thereby prevent vertical displacement between said squeegee mount and said squeegee rubber.

45. An apparatus, as claimed in claim 44, wherein:

when said squeegee mount side surface includes said crown and said first squeegee rubber side surface includes said first longitudinally extending slot, said second squeegee rubber side surface includes a second longitudinally extending slot that permits said squeegee rubber to be mounted to said squeegee mount side surface so that different portions of at least one of said squeegee rubber top edge and said squeegee rubber bottom edge can be positioned adjacent to the surface to be cleaned.

46. An apparatus, as claimed in claim 44, wherein:

when said first squeegee rubber side surface includes said crown and said squeegee mount side surface includes said first longitudinally extending slot, said second squeegee rubber side surface includes a second longitudinally extending crown that permits portions of at least one of said squeegee rubber top edge and said squeegee rubber bottom edge to be positioned adjacent to the surface to be cleaned.

47. An apparatus, as claimed in claim 44, wherein:

said squeegee mount includes a first buttonhead located on said squeegee mount side surface and adjacent to said first squeegee mount end and a second buttonhead located on said first squeegee mount side surface and adjacent to said second squeegee mount end;

said squeegee rubber includes a first squeegee rubber slot for engaging said first buttonhead and a second squeegee rubber slot for engaging said second buttonhead.

48. An apparatus, as claimed in claim 47, further comprising:

a fastening device for holding said squeegee rubber against said squeegee mount, said squeegee fastening device includes a first squeegee strap with a first squeegee strap slot for engaging first buttonhead, a second squeegee strap with a second squeegee strap slot for engaging said second buttonhead, and means for clamping said first squeegee strap to said second squeegee strap to hold said squeegee rubber between said first and second squeegee straps and said squeegee mount.

49. An apparatus, as claimed in claim 44, wherein:

said squeegee rubber has a squeegee rubber length that extends from said first squeegee rubber end to said second squeegee rubber end and is greater than a squeegee mount length that extends from said first squeegee mount end to said squeegee mount end.