E - Fixed Constructions – 03 – D
Patent
E - Fixed Constructions
03
D
4/17.7
E03D 9/03 (2006.01)
Patent
CA 1130507
ABSTRACT A passive dosing dispenser for issuing, for example, a predetermined volume of a liquid toilet tank additive solution into a toilet tank as the water is draining therefrom while the toilet is flushing. The dispenser employs no moving parts, and acts in response to the lowering of the water level in the toilet tank to dispense the liquid solution at a point in the flush cycle when it can be most effectively utilized. The liquid solution in the dispenser is maintained in an isolated condition by means of air locks from the toilet tank water surrounding the dispenser regardless of the depth to which the dispenser is immersed in the tank during quiescent periods inter- mediate flush cycles. A preferred dispenser embodiment comprises an air pump portion where air is trapped by rising tank water, the air being forced down against liquid solution housed within a liquid collector portion of the dispenser. As the tank water level continues to rise, it increases the air pump's driving head, thereby forcing the liquid solution acted upon by the pump to a level sufficiently high to fill a measuring pocket located adjacent an expansion chamber portion of the dispenser. The air pump also serves to supply air to the upper reaches of the non-vented liquid solution reservoir, thus partially vitiating the vacuum created within the upper reaches or head space of the reservoir by discharge of the liquid solution. The liquid solution level continues to rise in the expansion chamber adjacent the measuring pocket until such time as an air vent in fluid communication with the expansion chamber is blocked by the rising water level in the toilet tank. Because the air vent in fluid communication with the expansion chamber controls the height to which the liquid solution rises in the expansion chamber, it is critical that the air vent be so located as to permit the measuring pocket to be filled with the liquid solution to be dispensed during each pumping cycle of the dispenser, yet not so high as to eliminate the air-lock which is formed in the uppermost reaches of the expansion chamber. In fluid communication with the bottom of the measuring pocket is an inverted J-shaped syphon tube which is utilized to withdraw a predetermined dose-volume of liquid solution from the measuring pocket during each flush cycle. r EKL:ph
356505
Owens William A.
Williams Alvester Jr.
Gowling Lafleur Henderson Llp
The Procter & Gamble Company
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