Vacuum powered scrub head

• US 5,088,149 A
• Filed: 08/06/1990
• Issued: 02/18/1992
• Est. Priority Date: 08/06/1990
• Status: Expired due to Term

• Current Assignee: Tennant Company
• Original Assignee: Tennant Company
• Inventors: Brenner, David J., Forsman, Bruce W., Lehman, Ronald W., Berg, David W.
• Primary Examiner(s): Coe, Philip R.
• Assistant Examiner(s): ALEXANDER, REGINALD
• Application Number:
  US07/562,800
• Time in Patent Office: 561 Days
• Field of Search: 15/321, 15/322, 15/334, 15/387, 15/328
• US Class Current: 15/322
• CPC Class Codes: A47L 7/0009 with means mounted on the nozzle; nozzles specially adapted for the recovery of liquid
• CPC Class Codes: A47L 7/0042 Gaskets; Sealing means
• CPC Class Codes: A47L 9/0416 driven by fluid pressure, e.g. by means of an air turbine

Abstract

An improved scrub head for a cleaning wand to be used with a floor cleaning machine. The scrub head is supplied with vacuumized air and pressurized cleaning solution through the wand from the machine. The scrub head has a nozzle for applying cleaning solution to the floor, a powered rotating tool such as a brush or a pad for scrubbing the floor, and a vacuum pickup shoe or squeegee for picking up soiled cleaning solution. The squeegee, when used, has flexible lips of a novel and improved design. The rotating tool is driven by an air turbine which takes in its air from essentially clean ambient atmosphere, and a valve selectively and automatically connects the vacuumized air to either the turbine outlet, thus causing the turbine and tool to rotate for scrubbing the floor, or to the pickup shoe or squeegee for picking up soiled cleaning solution and debris.

Claims

1. Apparatus for cleaning a floor, comprising a rotatable floor cleaning tool, means to controllably dispense cleaning solution to the floor for agitation by the tool, a vacuum pickup device for removing soiled cleaning solution from the floor, an air turbine in driving relationship with said cleaning tool and having an inlet connected to essentially clean ambient air and an outlet, and a source of vacuumized air, means for selectively connecting said vacuumized air to either said air turbine outlet to drive the rotatable floor cleaning tool whereby the tool may perform a cleaning function on the floor, or to the vacuum pickup device, whereby the pickup device may remove soiled cleaning solution from the floor.

2. The apparatus of claim 1 in which the air inlet to the air turbine is located above the floor.

3. The apparatus of claim 1 in which the means for selectively connecting vacuumized air includes a valve which is responsive to pressure of the cleaning solution.

4. The apparatus of claim 1 in which the means for selective connection of vacuumized air automatically connects vacuumized air to the air turbine whenever cleaning solution is being dispensed to the floor and automatically connects vacuumized air to the pickup device whenever the dispensing of cleaning solution to the floor is stopped.

5. The apparatus of claim 4 further characterized by a manual control to override the automatic means for connecting vacuumized air so that on occasion the vacuumized air can be connected to the turbine although the dispensing of cleaning solution to the floor has been stopped.

6. The apparatus of claim 1 in which the means for selectively connecting vacuumized air includes a manually operable valve.

7. In a scrub head for cleaning a surface and for use with a vacuum wand, a vacuum source communicating to the scrub head through the vacuum wand, means for supplying cleaning solution to a surface to be cleaned, a movable tool in the scrub head for agitating the cleaning solution on the surface, an air turbine in the scrub head having an outlet and an inlet and having its inlet connected to a region of essentially clean ambient air, the air turbine being constructed and arranged to drive the tool, a vacuum pickup device in the scrub head to pick up and evacuate soiled cleaning solution from the surface being cleaned, and means for selectively connecting the vacuum source communicated to the scrub head either to the turbine outlet or to the pickup device so that the turbine will be driven by an air supply that is separate from the air used to convey soiled cleaning solution from the pickup device to the vacuum source.

8. The structure of claim 7 further characterized by having the air inlet to the air turbine located above the surface being cleaned.

9. The structure of claim 7 further characterized by and including means responsive to the supply of cleaning solution for directing the vacuum from the vacuum source to the turbine outlet when the cleaning solution is being supplied or to the pickup device when cleaning solution is not being supplied.

10. The scrub head of claim 9 further characterized in that the means for selective connection of the vacuum source either to the turbine outlet or to the pickup device is automatically responsive to the supply of cleaning solution so that the vacuum from the vacuum source is directed only to the turbine outlet to drive the tool when cleaning solution is being supplied and only to the pickup device when cleaning solution is not being supplied.

11. The scrub head of claim 10 further characterized by and including manually operable means for overriding the automatic means so that the supply of solution may be discontinued and the turbine and tool may continue to be operable.

12. The scrub head of claim 7 in which the means for selective connection of the vacuum source either to the turbine outlet or to the pickup device is manually operable.