Automatic switching assembly for manifolds

Claim 1

AN AUTOMATIC SWITCHING ASSEMBLY FOR CHANGING FROM ONE SOURCE OF HIGH PRESSURE GAS TO ANOTHER WHICH COMPRISES A FIRST CYLINDER CONTAINING A FIRST PISTON PROVIDED WITH SEALING RINGS, A SECOND CYLINDER CONTAINING A SECOND PISTON PROVIDED WITH SEALING RINGS, BOTH OF SAID FIRST AND SECOND PISTONS OPERATING BETWEEN OPERATIVE AND INOPERATIVE POSITIONS, FORCE EXERTING MEANS IN EACH CYLINDER TENDING TO URGE SAID PISTONS TOWARD SAID INOPERATIVE POSITION, SUPPLY PORTS IN EACH CYLINDER LOCATED TO BE SEALED BY EACH PISTON WHEN IT IS IN OPERATIVE POSITION AND IN OPEN COMMUNICATION WITH SAID CYLINDER WHEN SAID PISTON IS IN INOPERATIVE POSITION, A DISCHARGE CONDUIT CONTAINING A CHECK VALVE OPENING INTO EACH OF SAID CYLINDERS ON THE SIDE OR SAID PISTONS OPPOSITE SAID SUPPLY PORTS, SAID DISCHARGE CONDUITS BEING REMOTE FROM AND UNCOVERED IN ALL POSITIONS OF SAID PISTONS, CHANNEL MEANS CONNECTING THE SUPPLY PORT SIDE OF EACH CYLINDER TO THE DISCHARGE CONDUIT SIDE OF THE OTHER CYLINDER AND MEANS PREVENTING SAID PISTONS FROM SEALING SAID CHANNEL MEANS THEREBY PROVIDING OPEN COMMUNICATION IN ALL POSITIONS OF SAID PISTONS.