Floor cleaning apparatus

• US 5,555,596 A
• Filed: 05/31/1995
• Issued: 09/17/1996
• 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: O'Hara, Robert J., Knowlton, Christopher M.
• Primary Examiner(s): Scherbel, David
• Assistant Examiner(s): ALEXANDER, REGINALD
• Application Number:
  US08/454,626
• Time in Patent Office: 475 Days
• Field of Search: 15/340.1, 15/340.4, 15/401, 15/320, 15/322, 15/340.3, 15/98
• US Class Current: 15/320
• 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. An apparatus for cleaning a surface comprising:

a frame;

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

at least three wheels for moving said frame and said means for cleaning over a surface; and

means for steering at least one of said at least three wheels;

said means for cleaning includes a first disk brush for scrubbing the surface 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 the surface 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.

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

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

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

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

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

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

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

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

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

7. An apparatus, as claimed in claim 1, 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.

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

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

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

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

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

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

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

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

13. An apparatus, as claimed in claim 12, 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.

14. An apparatus, as claimed in claim 12, 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.

15. An apparatus, as claimed in claim 12, 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.

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

17. An apparatus, as claimed in claim 12, 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.

18. An apparatus, as claimed in claim 1, 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 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.

19. An apparatus, as claimed in claim 1, 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 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.

20. An apparatus for cleaning a surface comprising:

a frame;

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

at least three wheels for moving said frame and said means for cleaning over a surface; and

means for steering at least one of said at least three wheels;

said means for cleaning includes a first disk brush for scrubbing the surface 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 the surface 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;

wherein said first squeegee includes a vacuum squeegee;

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;

wherein said second squeegee includes a vacuum squeegee;

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.