Dual cleaning mode carpet extractor

• US 6,684,452 B2
• Filed: 10/17/2001
• Issued: 02/03/2004
• Est. Priority Date: 10/17/2001
• Status: Expired due to Term

• Current Assignee: Nilfisk A/S (Nilfisk Holding A/S)
• Original Assignee: Nilfisk-Advance Incorporated (Nilfisk Holding A/S)
• Inventors: Lehman, Dexter, Graupe, Nick, Friese, Agnes
• Primary Examiner(s): Snider, Theresa T.
• Application Number:
  US09/982,124
• Publication Number:
  US 20030070249A1
• Time in Patent Office: 839 Days
• Field of Search: 153/20, 153/22, 154/01, 153/402, 153/403, 134/21
• US Class Current: 15/320
• CPC Class Codes: A47L 11/03 characterised by having provisions for supplying cleaning or polishing agents A47L11/065, A47L11/085, A47L11/125, A47L11/145, A47L11/161, A47L11/1625, A47L11/185, A47L11/201 take precedence
• CPC Class Codes: A47L 11/302 having rotary tools
• CPC Class Codes: A47L 11/34 Machines for treating carpets in position by liquid, foam, or vapour, e.g. by steam
• 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 11/4044 Vacuuming or pick-up tools; Squeegees
• CPC Class Codes: A47L 11/4083 Liquid supply reservoirs; Preparation of the agents, e.g. mixing devices
• CPC Class Codes: A47L 11/4088 Supply pumps; Spraying devices; Supply conduits

Abstract

A carpet extractor (10) operable in either a restorative cleaning mode or a maintenance cleaning mode includes a constant rate pump (96) which dispenses clean solution through a manually operated valve (98) to one of two lines (100, 102) having nozzles which restrict dispensing to high and low solution flow rates. In the preferred form, clean solution is dispensed at the high flow rate directly upon the carpeted surface and at the low rate upon the agitating brush (88). When restorative cleaning is desired, the valve (98) is manually moved to dispense at the high flow rate and a switch (110) is also manually moved resulting in the chassis (18) being propelled at a slow working speed. When maintenance cleaning is desired, the valve (98) is manually moved to dispense at the low flow rate and the switch (110) is also manually moved resulting in the chassis (18) being propelled at a fast working speed.

Claims

1. Carpet extractor for cleaning a carpeted surface comprising, in combination:

a chassis movably supported on the carpeted surface;

means for propelling the chassis at first and second working speeds, with the first working speed being slower than the second working speed;

first means for selecting one of the first and second working speeds;

a carpeted surface agitator carried by the chassis;

a clean solution tank for containing clean solution carried by the chassis, with the clean solution being capable of being dispensed to the carpeted surface at high and low solution flow rates, with the high solution flow rate being greater than the low solution flow rate;

second means for selecting one of the high and low solution flow rates;

a dirty solution tank carried by the chassis; and

means for picking up solution off the carpet surface for collection in the dirty solution tank, with the carpet extractor being operable in both a restorative cleaning mode or a maintenance cleaning mode depending upon the selection of the high and low solution flow rates and the first and second working speeds.

2. The carpet extractor of claim 1 with the clean solution being dispensed upon the carpeted surfaced before the agitator at the high solution flow rate and being dispensed upon the agitator at the low solution flow rate for introduction to the carpeted surface by the agitator.

3. The carpet extractor of claim 2 with the agitator comprising a cylindrical brush rotated about an axis parallel to and spaced from the carpeted surface.

4. The carpet extractor of claim 3 with the clean solution being dispensed by a pump operating at a constant rate through a first dispensing line having at least one restorative nozzle allowing the high solution flow rate and a second dispensing line having at least one maintenance nozzle restricting dispensing of the clean solution to the low solution flow rate;

and with the second means comprising a valve receiving clean solution from the pump and directing the clean solution to only one of the first and second dispensing lines.

5. The carpet extractor of claim 4 with the valve being manually actuated.

6. The carpet extractor of claim 5 with the second means being manually actuated.

7. The carpet extractor of claim 6 with the picking up means comprising a vacuum shoe in fluid communication with the dirty solution tank.

8. The carpet extractor of claim 7 with the chassis being movably supported by wheels and further including a handle for manipulation by an operator walking adjacent the chassis.

9. The carpet extractor of claim 1 with the clean solution being dispensed by a pump operating at a constant rate through a first dispensing line having at least one restorative nozzle allowing the high solution flow rate and a second dispensing line having at least one maintenance nozzle restricting dispensing of the clean solution to the low solution flow rate;

and with the second means comprising a valve receiving clean solution from the pump and directing the clean solution to only one of the first and second dispensing lines.

10. The carpet extractor of claim 9 with the valve being manually actuated.

11. The carpet extractor of claim 10 with the second means being manually actuated.

12. Method for cleaning carpeted surfaces comprising:

providing a carpet extractor comprising, in combination;

a chassis movably supported on the carpeted surface;

means for propelling the chassis at first and second working speeds, with the first working speed being slower than the second working speed;

first means for selecting one of the first and second working speeds;

a carpeted surface agitator carried by the chassis;

a clean solution tank for containing clean solution carded by the chassis, with the clean solution being capable of being dispensed to the carpeted surface at high and low solution flow rates, with the high solution flow rate being greater than the low solution flow rate;

second means for selecting one of the high and low solution flow rates;

a dirty solution tank carried by the chassis; and

means for picking up solution off the carpet surface for collection in the dirty solution tank, with the carpet extractor being operable in both a restorative cleaning mode or a maintenance cleaning mode depending upon the selection of the high and low solution flow rates and the first and second working speeds;

selecting the dispensing of clean solution to the carpeted surface at either of the high and low solution flow rates, with the clean solution being dispensed at the selected flow rate;

agitating the carpeted surface including the dispensed clean solution with the carpeted surface agitator;

picking up the solution off the carpeted surface with the solution picking up means after the carpeted surface has been agitated with the carpeted surface agitator; and

selecting either the first and second working speeds, with the chassis being propelled at the selected working speed, with the carpeted surface being restorative or maintenance cleaned depending upon the selection of the high and low solution flow rates and the first and second working speeds to clean the carpeted surface.