Circuit-breakers for high voltage provided with a pneumatic driving mechanism

Claim 1

AN ELECTRIC CIRCUIT-BREAKER FOR HIGH VOLTAGES, COMPRISING A SWITCHING MEMBER MOVABLE BETWEEN AN OPEN POSITION IN WHICH IT CONTACTS NO MORE THAN ONE OF A PAIR OF SPACED CONTACTS TO A CLOSED POSITION IN WHICH IT BRIDGES SAID PAIR OF CONTACTS, SAID OPEN POSITION CORRESPONDING TO OPENING OF THE CIRCUIT BREAKER AND SAID CLOSED POSITION CORRESPONDING TO CLOSING OF THE CIRCUIT BREAKER, A PNEUMATIC MAIN CIRCUIT, A DOUBLE ACTING MAIN CYLINDER, A MAIN PISTON MOUNTED FOR RECIPROCATION IN SAID MAIN CYLINDER AND MECHANICALLY COUPLED TO SAID MOVABLE SWITCHING MEMBER, SAID PISTON DIVIDING SAID MAIN CYLINDER INTO TWO ACTIVE CHAMBERS, AN INDIVIDUAL COMPRESSED AIR CONDUIT CONNECTING SAID PNEUMATIC MAIN CIRCUIT TO EACH OF SAID CHAMBERS, A VALVE PROVIDED IN EACH OF SAID INDIVIDUAL COMPRESSED AIR CONDUITS, SAID VALVES BEING BIASED TO CLOSE SAID CONDUITS, A PNEUMATIC CONTROL CONDUIT CONNECTED TO EACH OF SAID INDIVIDUAL COMPRESSED AIR CONDUITS FOR INTRODUCING AIR PRESSURE PNEUMATIC COMMANDS TO RESPECTIVELY CLOSE AND OPEN THE CIRCUIT BREAKER, AUXILIARY CYLINDERS CONNECTED TO SAID CONTROL CONDUITS, PISTONS PROVIDED IN SAID AUXILIARY CYLINDERS AND COUPLED TO SAID VALVES TO MOVE THE VALVES TO OPEN THEIR RESPECTIVE INDIVIDUAL COMPRESSED AIR CONDUIT UPON AIR PRESSURE RESULTING FROM A PNEUMATIC COMMAND IN THE RESPECTIVE CONTROL CONDUIT, AN AUXILIARY VALVE PROVIDED IN THE CONTROL CONDUIT WHICH INTRODUCES PNEUMATIC COMMANDS FOR CLOSING THE CIRCUIT BREAKER, AND A CONTROL MEMBER MOUNTED ON SAID PISTON FOR RECIPROCATION THEREWITH, SAID AUXILIARY VALVE BEING NORMALLY BIASED TO OPEN THE SAID CLOSING CONTROL CONDUIT BUT BEING MOVABLE TO CLOSE THE CONTROL CONDUIT BY ENGAGEMENT WITH SAID CONTROL MEMBER DURING MOVEMENT OF SAID SWITCHING MEMBER AND CONNECTED MAIN PISTON TO SAID CLOSED POSITION.