A - Human Necessities – 47 – L
Patent
A - Human Necessities
47
L
A47L 11/34 (2006.01) A47L 5/38 (2006.01)
Patent
CA 2358725
A carpet cleaning system that delivers heated cleaning water from a truck to a carpet cleaning apparatus and an improved waste disposal tank designed to receive the waste water and deposit it into the toilet or sewer drain when the disposal tank is full. The disposal tank is divided into an upper primary recovery tank and a lower recovery tank. A main vacuum line and waste water return line are connected to the primary recovery tank. Disposed between the primary and secondary recovery tanks is a first check valve that controls the flow of waste water therebetween. Connected over the outlet port on the secondary recovery tank is a second check valve that operates in opposite direction to the first check valve. Attached to the secondary recovery tank is an air control valve that controls the flow of air from the primary recovery tank or the outside air into the secondary recovery tank. A timer or a float valve is connected to the air control valve to selectively control its operation. When the air control valve is inactivated, the air pressures in the tanks are equal and sub-atmospheric. When the air control valve is activated, the flow of air between the tanks is discontinued and outside air is able to flow into the secondary recovery tank. When outside air enters the secondary recovery tank, the first check valve closes to maintain vacuum pressure inside the primary recovery tank for cleaning, and the second check valve opens to allow discharge of the waste water from the secondary recovery tank.
Finlayson & Singlehurst
Naseth Donald P. SR.
LandOfFree
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