Liquid extraction cleaning device and method

• US 9,706,893 B2
• Filed: 01/29/2015
• Issued: 07/18/2017
• Est. Priority Date: 02/28/2014
• Status: Active Grant

• Current Assignee: Rug Doctor
• Original Assignee: Rug Doctor
• Inventors: Wall, Timothy, Morrow, Ann Marie, Haug, Walter, Le, Phuong, Ostendorf, Charles Michael, Pereira, Schubert, Chavana, Jr., Ernest Matthew, Tilk, Jason, Stephens, Paul, Lau, Vincent, Hill, Jason Edward, Spirk, Evan, Tufts, Lindsey, Saunders, Craig
• Primary Examiner(s): NGUYEN, DUNG V
• Application Number:
  US14/608,548
• Publication Number:
  US 20150245750A1
• Time in Patent Office: 901 Days
• CPC Class Codes: A47L 11/201 with supply of cleaning agents
• CPC Class Codes: A47L 11/202 having separate drive for the cleaning brushes
• CPC Class Codes: A47L 11/307 having reciprocating 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 11/4002 Installations of electric equipment
• CPC Class Codes: A47L 11/4008 Arrangements of switches, indicators or the like
• 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 11/4075 Handles; levers
• CPC Class Codes: A47L 11/4088 Supply pumps; Spraying devices; Supply conduits

Abstract

A liquid extraction cleaning device comprises a main unit, a liquid pump, a flexible hose, and a hand tool. The main unit comprises a vacuum pump. The hand tool comprises a vacuum inlet port, an agitator, a spray nozzle, and a grip portion. The vacuum inlet port of the hand tool is operatively connected to the vacuum pump via the hose passageway in a manner such that the vacuum pump is capable of drawing fluid through the vacuum inlet port and into the hose passageway. The spray nozzle is operatively connected to the liquid pump in a manner such that the liquid pump is capable of forcing liquid out of the spray nozzle.

Claims

1. A liquid extraction cleaning device comprising:

a main unit, the main unit comprising a vacuum pump;

a liquid pump;

a flexible hose surrounding a hose passageway, the flexible hose being operatively connected to the vacuum pump in a manner such that the vacuum pump is capable of drawing fluid through the hose passageway;

a hand tool, the hand tool comprising a vacuum inlet port, an agitator, an electric motor, a spray nozzle, and a grip portion, the hand tool being connected to the main unit by the flexible hose such that the hand tool is movable relative to the main unit, the vacuum inlet port being operatively connected to the vacuum pump via the hose passageway in a manner such that the vacuum pump is capable of drawing fluid through the vacuum inlet port and into the hose passageway, the spray nozzle being operatively connected to the liquid pump in a manner such that the liquid pump is capable of forcing liquid out of the spray nozzle, the electric motor being operatively connected to the agitator in a manner such that operation of the electric motor causes the agitator to move relative to the grip portion; and

an electrical cable extending within and along the hose passageway, the electrical cable being operatively connected to the electrical motor of the hand tool and to the main unit in a manner such that the electrical cable can supply electrical power to the electric motor from the main unit.

2. A liquid extraction cleaning device in accordance with claim 1 wherein the hand tool comprises an agitator switch and the agitator switch is configured and adapted to control whether the electric motor receives electricity.

3. A liquid extraction cleaning device in accordance with claim 2 wherein the liquid extraction device is configured and adapted such that the electric motor of the hand tool operates on direct current below twenty-five volts supplied via the main unit through the electrical cable.

4. A liquid extraction cleaning device in accordance with claim 1 wherein the electric motor is configured to pivotally reciprocate the agitator and the agitator comprises bristles.

5. A liquid extraction cleaning device in accordance with claim 1 wherein the hand tool comprises a spray switch and the spray switch is configured and adapted to control the operation of the liquid pump in a manner controlling whether liquid is sprayed out of the spray nozzle.

6. A liquid extraction cleaning device in accordance with claim 5 wherein the spray switch is an electrical switch, the liquid pump is electrically powered, and the spray switch is configured and adapted to control whether the liquid pump receives electricity.

7. A liquid extraction cleaning device in accordance with claim 6 wherein the hand tool comprises an agitator switch, the agitator switch is configured and adapted to control whether the electric motor receives electricity, and the spray and agitator switches can independently control the operation of the liquid pump and electric motor respectively.

8. A liquid extraction cleaning device in accordance with claim 6 wherein the liquid pump is fixed in position relative to the main unit, the electrical cable comprises multiple electrical wires, and the spray switch controls the operation of the liquid pump via at least one of the electrical wires.

9. A liquid extraction cleaning device in accordance with claim 8 wherein the liquid extraction device is configured and adapted such that the electric motor of the hand tool and the spray switch operate on direct current below twenty-five volts, and the liquid pump is configured and adapted to operate on alternating current.

10. A liquid extraction cleaning device in accordance with claim 8 wherein the main unit comprises a recessed cradle configured and adapted to releasably hold the hand tool when the liquid extraction cleaning device is stored in a manner such that the spray nozzle of the hand tool is above the liquid pump and the flexible hose during storage.

11. A liquid extraction cleaning device in accordance with claim 10 wherein the main unit comprises a hose storage receptacle, and the hose storage receptacle is configured and adapted to releasably hold the flexible hose beneath the spray nozzle of the hand tool during storage.

12. A liquid extraction cleaning device in accordance with claim 8 wherein the hand tool comprises an agitator switch, the agitator switch is configured and adapted to control whether the electric motor receives electricity, and the spray and agitator switches can independently control the operation of the liquid pump and electric motor respectively.