Surface maintenance vehicle with an integrated water trap for trapping residual waste

• US 10,188,251 B2
• Filed: 10/16/2015
• Issued: 01/29/2019
• Est. Priority Date: 11/03/2014
• Status: Active Grant

• Current Assignee: Tennant Company
• Original Assignee: Tennant Company
• Inventors: Nortrup, Eric S., Boers, Nicholas E., Caudill, Brent
• Primary Examiner(s): Scruggs, Robert J
• Application Number:
  US14/885,152
• Publication Number:
  US 20160120385A1
• Time in Patent Office: 1,201 Days
• CPC Class Codes: A47L 11/30 by suction
• CPC Class Codes: A47L 11/4016 specially adapted for collecting fluids
• CPC Class Codes: A47L 11/4036 Parts or details of the surface treating tools
• CPC Class Codes: A47L 11/4044 Vacuuming or pick-up tools; Squeegees
• CPC Class Codes: A47L 11/4072 Arrangement of castors or wheels
• CPC Class Codes: A47L 11/4077 Skirts or splash guards

Abstract

Embodiments include a waste recovery system for a floor surface maintenance machine. The waste recovery system comprises a squeegee assembly having a squeegee frame, a squeegee retainer extending below the squeegee frame and a reservoir integrally defined in the squeegee retainer. The reservoir can have an inlet passage proximal to the floor surface, an outlet passage fluidly coupled to the fluid suction path and leading to the waste recovery tank, and a fluid trap portion positioned between the inlet and outlet passages. The fluid trap portion can retain backflow waste in the fluid suction path. The reservoir is positioned at a clearance distance from the floor surface in a direction normal to the floor surface such that the reservoir forms the lowest portion of the waste recovery system in the direction normal to the floor surface.

Claims

1. A waste recovery system for a floor surface maintenance machine comprising:

a squeegee assembly having

a squeegee frame having a top edge, and

a first squeegee operable to engage a floor surface and connected to the squeegee frame; and

a reservoir operatively connected to the squeegee assembly, the reservoir comprising an inlet passage, an outlet passage and a fluid trap portion in fluid communication with the inlet passage and outlet passage, the fluid trap portion having a bottom wall and side walls, the fluid trap portion being adapted to retain backflow waste within the side walls and the bottom wall,

the bottom wall of the fluid trap portion being positioned below the top edge of the squeegee frame, such that backflow waste trapped above the fluid trap portion pools within a space formed by the bottom wall and the side walls of the fluid trap portion and is prevented from draining to the floor surface.

2. The waste recovery system of claim 1, wherein the fluid trap portion is generally inline with the outlet passage.

3. The waste recovery system of claim 1, wherein the fluid trap portion has a rounded shape, the rounded shape of the fluid trap portion causing waste to be drawn inside the reservoir with a generally uniform velocity at the inlet passage.

4. The waste recovery system of claim 3, wherein the rounded shape of the fluid trap portion assists in clearing waste trapped in the fluid trap portion when a vacuum system connectable to the waste recovery system starts suctioning waste from the floor surface to the waste recovery system.

5. The waste recovery system of claim 4, wherein walls of the inlet passage and outlet passage are offset from each other by an offset distance such that trapped waste from the outlet passage flow directly into the fluid trap portion without entering the inlet passage when the vacuum system stops suctioning waste from the floor surface.

6. The waste recovery system of claim 1, wherein an inlet of the inlet passage has an inlet passage height sufficient to cause the waste to be drawn into the reservoir with a uniform velocity into the inlet passage.

7. The waste recovery system of claim 6, wherein the inlet passage has a first wall extending to a height equaling an inlet passage height, the outlet passage has a second wall, wherein the fluid trap portion is defined by the first wall of the inlet passage and the second wall of the outlet passage.

8. The waste recovery system of claim 1, further comprising a cover removably coupled to the squeegee frame, the cover adapted to cover at least a portion of the reservoir, wherein the cover is configured for providing access to the fluid trap portion.

9. The waste recovery system of claim 1, further comprising a second squeegee connectable to the squeegee frame.

10. The waste recovery system of claim 9, wherein the second squeegee is placed proximal to a back wall of the squeegee frame wherein the back wall of the squeegee frame is generally located on a rear portion of the floor surface maintenance machine.

11. The waste recovery system of claim 10, wherein the second squeegee is supported by the squeegee frame.

12. The waste recovery system of claim 10 wherein the fluid trap portion has a front wall and a rear wall, the front wall and the rear wall of the fluid trap portion being positioned interior to a space formed by the first squeegee and the second squeegee.

13. The waste recovery system of claim 12, wherein the waste recovery system is operatively coupled to a vacuum system adapted to start and stop suctioning waste from the floor surface, wherein the fluid trap portion is adapted to retain and pool backflow waste when the vacuum system stops suctioning waste from the floor surface.

14. The waste recovery system of claim 13, further comprising a waste recovery tank, a recovery hose fluidly coupled to the waste recovery tank and a fluid suction path extending from the floor surface to the waste recovery tank via the recovery hose, the fluid suction path operably coupled to the vacuum system such that the vacuum system draws waste from the floor surface through the fluid suction path by applying a suction force.

15. The waste recovery system of claim 14, wherein the reservoir is shaped to be generally self-cleaning such that the reservoir substantially clears backflow waste trapped in the fluid trap portion when the vacuum system starts suctioning waste from the floor surface to the waste recovery tank.

16. The waste recovery system of claim 15, wherein:

the inlet passage is positioned proximal to a rear wall of the squeegee frame,

the outlet passage is fluidly coupled to the fluid suction path and leading to the waste recovery tank,

the first squeegee is positioned near the rear wall of the squeegee frame, and

the second squeegee is positioned near a front wall of the squeegee frame, the front wall of the squeegee frame being opposite to the rear wall of the squeegee frame.

17. The waste recovery system of claim 1, wherein the inlet passage is offset from a transverse centerline of the squeegee frame and towards the second squeegee when the machine is moving in a forward direction.

18. The waste recovery system of claim 1, wherein the reservoir includes an inclined portion, the inclined portion adapted to direct waste from the inlet passage to flow in a direction generally parallel to an inclination axis and toward the outlet passage.

19. The waste recovery system of claim 1, wherein the squeegee frame supports the first squeegee.

20. The waste recovery system of claim 19, wherein the bottom wall of the fluid trap portion is below an upper end of the first squeegee.

21. The waste recovery system of claim 1, wherein the side walls of the fluid trap portion are separate from walls of the squeegee frame.