Scrubber with hydraulic squeegee lift

• US 4,334,335 A
• Filed: 09/03/1980
• Issued: 06/15/1982
• Est. Priority Date: 09/03/1980
• Status: Expired due to Term

• Current Assignee: Tennant Company
• Original Assignee: Tennant Company
• Inventors: Brown, Neil F., Krier, Keith N., Nirgude, Ranjan K.
• Primary Examiner(s): Moore, Chris K.
• Application Number:
  US06/183,727
• Time in Patent Office: 650 Days
• Field of Search: 15/82-87, 15/319, 15/320, 15/339, 15/340
• US Class Current: 15/319
• CPC Class Codes: A47L 11/30 by suction
• CPC Class Codes: A47L 11/40 Parts or details of machines not provided for in groups A47L11/02 - A47L11/38, or not restricted to one of these groups, e.g. handles, arrangements of switches, skirts, buffers, levers
• CPC Class Codes: A47L 11/4002 Installations of electric equipment
• CPC Class Codes: A47L 11/4011 Regulation of the cleaning machine by electric means; Control systems and remote control systems therefor
• CPC Class Codes: A47L 11/4055 for lifting the tools to a non-working position
• CPC Class Codes: A47L 11/4061 Steering means; Means for avoiding obstacles; Details related to the place where the driver is accommodated
• CPC Class Codes: A47L 11/4066 Propulsion of the whole machine
• CPC Class Codes: A47L 11/4069 Driving or transmission means for the cleaning tools

Abstract

A scrubbing device is provided including a body which is supported on a plurality of wheels which are driven by a hydraulic pump. The scrubbing machine has a squeegee which is hydraulically raised and lowered. The machine is provided with a sensing device adjacent the hydraulic drive pump which senses the flow of the hydraulic fluid and actuates valving to raise the squeegee upon reverse movement of the scrubber and lower the squeegee upon forward movement of the scrubber.

Claims

1. A scrubbing device, comprising a body structure;

front and rear wheel means for movably supporting the body structure;

steering means for controlling the direction traversed by the scrubbing device;

scrubbing brush means carried by the body for wetting and scrubbing a path;

scrubbing brush lift means for raising and lowering the scrubbing brush means;

vacuum squeegee means carried by the body and disposed rearwardly of the brush means for picking up scrubbing solution from the wetted path;

squeegee lift means for hydraulically raising and lowering the vacuum squeegee means;

hydraulic power source means carried by the body, said power source means serving to pump a flow of hydraulic fluid in a first direction for driving said wheel means in a forward direction;

said power source means serving to pump said hydraulic fluid in a reverse direction for driving said wheel means in a reverse direction;

said power source means further serving to drive said scrubbing brush means, said scrubbing brush lift means, said vacuum squeegee means, and said squeegee lift means;

solenoid operated hydraulic valve means for actuating said squeegee lift means and hydraulically powered flow-sensing electrical switch means for driving said solenoid valve means, said hydraulic switch means serving to sense the flow direction of the hydraulic fluid in reverse and to then activate said squeegee lift means.

2. A scrubbing device of claim 1 wherein said flow switch means comprise a hydraulically operated single pole double throw electrical switch.

3. A scrubbing device of claim 2 wherein said flow-sensing switch means includes a reciprocable piston carrying a magnet and wherein said switch is actuated by said magnet.

4. A self-propelled, scrubbing device for applying scrubbing solution to a surface, scrubbing the surface with the solution and retrieving the dirty solution from the surface, said scrubbing device comprising:

a vehicular structure supported on a plurality of wheels;

a hydraulic drive motor carried by said vehicular structure, said drive motor serving to drive at least certain of said wheels;

a hydraulically assisted steering means for directing the scrubbing device;

a hydraulically driven brush means carried by the vehicular structure and disposed substantially forwardly on the vehicular structure for wetting and scrubbing a path on said surface;

a hydraulic brush lift means for raising and lowering the brush means;

a vacuum squeegee means carried by the vehicular structure and disposed substantially rearwardly on the vehicular structure for picking up scrubbing solution from the wetted path;

a hydraulic squeegee lift means for raising and lowering the vacuum squeegee means; and

sensing means for detecting reversal of the hydraulic flow from said hydraulic drive motor, said sensing means serving to actuate said hydraulic squeegee lift means whereby the vacuum squeegee means is lowered and raised for forward and rearward movement, respectively.

5. A scrubbing device of claim 4 wherein the sensing means includes a fluid flow direction sensing switch for detecting the direction of the hydraulic fluid flow and to actuate the raising and lowering of the vacuum squeegee means dependent on the direction of the fluid flow.

6. A scrubbing device for scrubbing floor areas comprising:

a vehicle including wheels, steering mechanism, brushes and a squeegee;

a hydraulic power source means for producing a reversible hydraulic fluid flow, said power source means being carried within the vehicle for providing vehicle power, said hydraulic means being adapted for driving the wheels and brushes and for lifting and lowering the squeegee; and

sensing means for detecting the reversal of the direction of flow of hydraulic fluid for actuating said means for raising and lowering said squeegee whereby the squeegee is lowered for forward movement and raised for rearward movement of said vehicle.

7. The scrubbing device of claim 6 wherein the sensing means includes an electrical switch.

8. The scrubbing device of claim 6 wherein said sensing means comprises a hydraulic flow-sensing single pole double throw magnetic switch.

9. The scrubbing device of claim 8 wherein said sensing means includes a reciprocable piston carrying a magnet and wherein said switch is activated by said magnet.

10. A scrubbing device, comprising a body structure;

front and rear wheel means for movably supporting the body structure;

steering means for controlling the direction traversed by the scrubbing device;

scrubbing brush means carried by the body for wetting and scrubbing a path;

vacuum squeegee means carried by said scrubbing device and disposed rearwardly of the brush means for picking up scrubbing solution from the wetted path;

squeegee lift means for raising and lowering the vacuum squeegee means;

hydraulic power source means carried by the body, said power source means serving to pump hydraulic fluid for driving said wheel means;

means for actuating said squeegee lift means and hydraulically powered flow-sensing electrical switch means for driving said actuating means, said hydraulic switch means serving to sense reversal of fluid flow from the hydraulic power source and to then activate said squeegee lift means.

11. A scrubbing device of claim 10 wherein said flow switch means comprise a hydraulically operated single pole double throw electrical switch.

12. A scrubbing device of claim 11 wherein said flow switch includes a reciprocable piston carrying a magnet.

13. A propelled, scrubbing device for applying scrubbing solution to a surface, scrubbing the surface with the solution and retrieving the dirty solution from the surface, said scrubbing device comprising:

a vehicular structure supported on a plurality of wheels;

a hydraulic drive motor carried by said vehicular structure for pumping hydraulic fluid thereby driving said wheels;

driven brush means carried by the vehicular structure for wetting and scrubbing a path on said surface;

brush lift means for raising and lowering the brush means;

vacuum squeegee means carried by the vehicular structure and disposed rearwardly of the brush means on the vehicular structure for picking up scrubbing solution from the wetted path;

hydraulic squeegee lift means for raising and lowering the vacuum squeegee means; and

sensing means for detecting reversal of hydraulic flow from said hydraulic drive motor from one flow direction to the other, said sensing means serving to actuate said hydraulic squeegee lift means whereby the vacuum squeegee means is lowered and raised for forward and rearward movement, respectively, of said scrubbing device.

14. A scrubbing device of claim 13 wherein the sensing means includes a fluid flow direction sensing switch for detecting said reversal of hydraulic flow.

15. A propelled, scrubbing device for applying scrubbing solution to a surface, scrubbing the surface with the solution and retrieving the dirty solution from the surface, said scrubbing device comprising:

a vehicular structure supported on a plurality of wheels;

a hydraulic drive motor carried by said vehicular structure for driving said wheels;

a hydraulically driven brush means carried by the vehicular structure for wetting and scrubbing a path on said surface;

hydraulic brush lift means for raising and lowering the brush means;

vacuum squeegee means carried by the vehicular structure and disposed rearward of the brush means on the vehicular structure for picking up scrubbing solution from the wetted path;

hydraulic squeegee lift means for raising and lowering the vacuum squeegee means; and

sensing means for detecting hydraulic fluid flow capable of producing rearward movement of said scrubbing device, said sensing means serving to actuate said hydraulic squeegee lift means whereby the vacuum squeegee means is automatically raised for rearward movement of said scrubbing device.

16. A scrubbing device of claim 15 wherein the sensing means includes a fluid flow direction sensing switch for sensing the direction of the hydraulic fluid flow and thereby detecting forward and rearward movement of the scrubbing device, the vacuum squeegee means being automatically lowered for forward movement and automatically raised for rearward movement.

17. A scrubbing device of claim 16 wherein said sensing means includes a reciprocable piston carrying a magnet and wherein said switch is acutated by said magnet.