Liquid dispensing apparatus

Claim 1

APPARATUS FOR DISPENSING MEASURED DOSAGES OF A LIQUID, SUCH AS LIQUID FUMIGANT, COMPRISING A PRESSURE TANK FOR CONTAINING PRESSURIZED GAS, A LIQUID TANK FOR CONTAINING THE LIQUID TO BE DISPENSED, A SUPPORT, SAID TANKS BEING MOUNTED ON SAID SUPPORT, A DELIVERY LINE CONNECTING SAID PRESSURE TANK TO SAID LIQUID TANK, A CYLINDER MOUNTED ON SAID SUPPORT, SAID CYLINDER HAVING AN INLET AT ONE END AND AN OUTLET AT THE OTHER END, A LINE CONNECTED BETWEEN SAID LIQUID TANK AND SAID CYLINDER INLET FOR SUPPLYING LIQUID UNDER PRESSURE TO THE LATTER, SAID CYLINDER HAVING A VALVE SEAT AT ITS OUTLET END, A MOVABLE VALVE MEMBER IN THE CYLINDER, RESILIENT MEANS IN THE CYLINDER BIASING SAID MOVABLE VALVE MEMBER TOWARD THE INLET END OF THE CYLINDER, SAID MOVABLE VALVE MEMBER BEING ADAPTED TO MOVE TOWARD THE OUTLET END OF THE CYLINDER IN RESPONSE TO A PRESSURE DROP IN THE CYLINDER ON THE OUTLET SIDE OF THE MOVABLE VALVE MEMBER AND FORCE LIQUID THROUGH THE CYLINDER OUTLET, SAID MOVABLE VALVE MEMBER, UPON MOVING TO THE OUTLET END OF THE CYLINDER, BEING ENGAGEABLE WITH SAID VALVE SEAT TO CUT OFF FLOW FROM THE OUTLET END OF THE CYLINDER, AN INWARDLY PROJECTING NIPPLE AT THE OUTLET END OF SAID CYLINDER THROUGH WHICH LIQUID FLOWS, SAID VALVE SEAT BEING ON THE INNER END OF SAID NIPPLE, SAID RESILIENT MEANS COMPRISING A SPRING SURROUNDING SAID NIPPLE AND EXTENDING BETWEEN THE MOVABLE VALVE MEMBER AND THE OUTLET END OF THE CYLINDER, A DELIVERY HOSE HAVING A CONNECTION TO THE CYLINDER OUTLET, A MANUALLY OPERABLE DELIVERY VALVE AT THE OUTER END OF THE DELIVERY HOSE, A BY-PASS BEING ADAPTED TO EFFECT A PRESSURE VIDING FOR COMMUNICATION FROM THE SUPPLY HOSE TO THE CYLINDER OUTLET ON THE OUTLET SIDE OF THE MOVABLE VALVE MEMBER, SAID BY-PASS BEING ADAPTED TO EFFECT A PRESSURE DROP ON THE OUTLET SIDE OF SAID MOVABLE VALVE MEMBER UPON OPERATION OF SAID MANUALLY OPERABLE VALVE WHEREUPON THE MOVABLE VALVE MEMBER MOVES TOWARD THE OUTLET END OF THE CYLINDER TO FORCE A MEASURED DOSAGE OF LIQUID OUT THROUGH THE CYLINDER OUTLET AND DELIVERY HOSE, AND ADAPTED TO PROVIDE FOR EQUALIZATION OF PRESSURE ON BOTH SIDES OF THE MOVABLE VALVE MEMBER AFTER THE LATTER HAS MOVED INTO ENGAGEMENT WITH SAID VALVE SEAT AND SAID MANUALLY OPERABLE VALVE IS RELEASED, WHEREUPON SAID RESILIENT MEANS MOVES THE MOVABLE VALVE MEMBER TO THE INLET END OF THE CYLINDER.