Liquid-dispensing nozzle with automatic cutoff

Claim 1

A NOZZLE WITH AUTOMATIC CUTOFF FOR DISPENSING LIQUID FROM A NONDRAINING HOSE, COMPRISING A TUBULAR HOUSING WITH AN OPEN FRONT END AND WITH AN OPEN REAR END CONNECTABLE TO SAID HOSE; AN ELONGATED SPIGOT SECURED TO SAID FRONT END, SAID SPIGOT HAVING A RELATIVELY WIDE FILLING CHANNEL COMMUNICATING WITH THE INTERIOR OF SAID HOUSING AND A RELATIVELY NARROW AIR CHANNEL EXTENDING FROM A LOCATION WITHIN SAID HOUSING TO A PORT OPENING INTO THE ATMOSPHERE NEAR THE FREE END OF SAID SPIGOT; PRESSURE-SENSITIVE PISTON MEANS IN A SPACE OF SAID HOUSING SEPARATED FROM SAID INTERIOR; A VALVE BODY AXIALLY MOVABLE IN SAID INTERIOR, SAID HOUSING BEING PROVIDED NEAR ITS REAR END WITH A CONSTRICTION FORMING A VALVE SEAT; A PAIR OF SLIDABLY INTERCONNECTED CONTROL MEMBERS AXIALLY MOVABLE IN SAID HOUSING WITH FREEDOM OF LIMITED RELATIVE DISPLACEMENT IN AN AXIAL DIRECTION, ONE OF SAID MEMBERS BEARING SAID VALVE BODY; FIRST SPRING MEANS IN SAID HOUSING BEARING UPON SAID ONE OF SAID MEMBERS FOR URGING SAID VALVE BODY AGAINST SAID SEAT, THEREBY BLOCKING THE FLOW OF LIQUID THROUGH SAID HOUSING; A HANDLE EXTERNALLY MOUNTED ON SAID HOUSING, SAID HANDLE BEING PROVIDED WITH AN EXTENSION PROJECTING INTO SAID HOUSING, THE OTHER OF SAID MEMBERS BEING LINKED WITH SAID EXTENSION FOR FORWARD DISPLACEMENT AWAY FROM SAID VALVE SEAT UPON MOVEMENT OF SAID HANDLE FROM A NORMAL POSITION TO AN OFF-NORMAL POSITION; SECOND SPRING MEANS WEAKER THAN SAID FIRST SPRING MEANS BEARING UPON SAID MEMBERS FOR TENDING TO MAINTAIN THEM IN A PREDETERMINED RELATIVE POSITION; AND LATCH MEANS IN SAID HOUSING LIMITEDLY DISPLACEABLE IN AXIAL DIRECTION OF SAID HOUSING, SAID LATCH MEANS BEING SIMULTANEOUSLY ENGAGEABLE WITH COOPERATING FORMATIONS ON BOTH SAID MEMBERS IN SAID PREDETERMINED RELATIVE POSITION THEREOF WHEREBY MOVEMENT OF SAID HANDLE INTO SAID OFF-NORMAL POSITION FORCES SAID ONE OF SAID MEMBERS AWAY FROM SAID VALVE SEAT AND ENABLES THE FLOW OF LIQUID FROM SAID HOSE TO SAID SPIGOT, SAID HOUSING BEING FORMED WITH A FIRST PASSAGE EXTENDING FROM SAID AIR CHANNEL OF SAID SPIGOT TO A PART OF SAID SPACE ON ONE SIDE OF SAID PISTON MEANS, SAID HOUSING BEING FURTHER FORMED WITH A SECOND PASSAGE EXTENDING FROM SAID PART OF SAID SPACE TO A POINT ALONG THE FLOW PATH OF SAID LIQUID THROUGH SAID INTERIOR WHEREBY SUCTION DUE TO SAID FLOW BECOMES EFFECTIVE UPON THE BLOCKING OF SAID PORT TO DISPLACE SAID PISTON MEANS, SAID LATCH MEANS BEING LINKED WITH SAID PISTON MEANS FOR DISENGAGEMENT FROM AT LEAST ONE OF SAID FORMATIONS UPON SUCTION-INDUCED DISPLACEMENT OF SAID PISTON MEANS, THEREBY ENABLING SAID FIRST SPRING MEANS TO RESTORE SAID ONE OF SAID MEMBERS TO FLOW-BLOCKING POSITION, SAID LATCH MEANS COMPRISING A SLOTTED CAGE AND ROLLER MEANS MOVABLE IN SLOTS OF SAID CAGE IN AXIAL DIRECTION OF SAID HOUSING, SAID ROLLER MEANS BEING ENGAGEABLE WITH SAID FORMATIONS, SAID CAGE BEING SECURED TO SAID MEMBRANE WITH FREEDOM OF LIMITED RELATIVE MOBILITY.