System and method for cleaning carpet and the like

• US 5,752,289 A
• Filed: 04/30/1996
• Issued: 05/19/1998
• Est. Priority Date: 04/30/1996
• Status: Expired due to Fees

• Current Assignee: White Magic, Inc.
• Original Assignee: Dale T. Collins
• Inventors: Collins, Dale T.
• Primary Examiner(s): MOORE, CHRISTOPHER K
• Application Number:
  US08/640,136
• Time in Patent Office: 749 Days
• Field of Search: 15/375, 15/421
• US Class Current: 15/421
• 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 11/4044 Vacuuming or pick-up tools; Squeegees
• CPC Class Codes: A47L 11/4088 Supply pumps; Spraying devices; Supply conduits
• CPC Class Codes: A47L 7/0009 with means mounted on the nozzle; nozzles specially adapted for the recovery of liquid

Abstract

A system for cleaning carpets and other textiles utilizing an applicator wand with which a cleaning liquid is spray-applied to the carpet and with which the cleaning liquid and loosened debris are removed from the carpet under the influence of a vacuum created by a vacuum pump. The applicator wand includes an operator-controlled aerator valve through which air can be introduced into the flow of cleaning liquid routed to the dispensing nozzles of the wand to thereby permit an operator to readily adjust the condition of the liquid being applied to the carpet between an aerated and a non-aerated condition. In addition, the applicator wand utilizes a flow restrictor valve to limit the strength of the vacuum generated at the lower edges of the wand at an amount acceptable to pull a substantial amount of liquid from the carpet while preventing the creation of an undesirable seal between the lower edges of the wand and the carpet. In addition, a dryer attachment for use with the vacuum of the system utilizes a rotatable brush for disturbing the fibers of the carpet as the attachment is moved thereacross, an air-powered turbine for rotating the brush, and a blower and air-heating components for introducing heated air over the fibers of the carpet being disturbed by the brush.

Claims

1. A wand with which a liquid is removed from a carpet, the wand comprising:

an elongated conduit connectable at one end to a vacuum source for drawing liquid from the carpet through the other end of the conduit, the conduit including a hood portion at said other end of the conduit wherein the hood portion includes first and second downwardly-opening compartments wherein each of the first and second hood portion compartments has a mouth having edges which contact the carpet during a liquid-removal operation performed with the wand and a port disposed downstream of the mouths through which the interiors of the compartments are capable of communicating, the first of the hood portion compartments being in direct flow communication with a vacuum source by way of said one end of the conduit so that a vacuum is generated within the interior of the first hood portion compartment by the vacuum source during a liquid-removal operation; and

valve means associated with the port for limiting the pressure of the vacuum generated within the interior of the first hood portion compartment to a preselected vacuum pressure level so that upon generation of the preselected vacuum pressure level within the first hood portion compartment, air is permitted to enter the interior of the first hood portion compartment from the interior of the second hood portion compartment thereby drawing air through the mouth of the second hood portion compartment so that all of the air which is drawn toward the vacuum source by way of the elongated conduit of the wand is drawn through one or both mouths of the first and second hood portion compartments.

2. The wand as defined in claim 1 wherein the valve means is adapted to permit a flow of air into the conduit by way of the port upon the generation of a vacuum within the hood portion which is at least as great as the preselected pressure level.

3. The wand as defined in claim 2 wherein the valve means includes a flow restrictor including a movable plug which is movable relative to the port between two positions in response to the generation of a vacuum pressure within the conduit which is at least as great as the preselected level so that upon generation of a vacuum pressure which is at least as great as the preselected level, the plug is moved to a position at which a flow of air through the port is permitted.

4. The wand as defined in claim 3 wherein the flow restrictor includes a valve body having a passageway through which air is pulled as it moves through the port toward the vacuum source, and the plug is movable relative to the valve body between a first position at which the air flow through the port is substantially shut off and a second position at which the air flow through the port is permitted, and the plug is moved from the first position toward the second position in response to the creation of a vacuum pressure within the hood portion which is at least as great as the preselected level.

5. The wand as defined in claim 4 wherein the plug is spring-biased from the second condition toward its first position so that an amount of force which is at least as great as a preselected pressure level must necessarily be exerted by the vacuum generated within the hood in order to move the plug against the force of the spring from the first position toward the second position.