Phase absence protective device for polyphase circuit breakers

Claim 1

A POLYPHASE COMPRESSED GAS OPERATED CIRCUIT BREAKER APPARATUS AND A PHASE ABSENCE PROTECTIVE DEVICE COMBINED THEREWITH COMPRISING A PLURALITY OF PHASE CIRCUIT BREAKERS HAVING THEIR CONTACTS CONNECTABLE IN THE RESPECTIVE PHASES TO BE SWITCHED AND THE CONTACTS OF EACH SAID PHASE CIRCUIT BREAKER BEING ENCLOSED WITHIN AN INTERRUPTING CHAMBER AND BEING ACTUATED TO OPEN POSITION UPON INTRODUCTION OF COMPRESSED GAS INTO THE CHAMBER, A BLAST VALVE INDIVIDUAL TO EACH SAID PHASE CIRCUIT BREAKER FOR CONTROLLING ADMISSION OF COMPRESSED GAS INTO THE CORRESPONDING INTERRUPTING CHAMBER, FIRST COMPRESSED GAS OPERATED PISTON AND CYLINDER ASSEMBLIES INDIVIDUAL TO SAID PHASE CIRCUIT BREAKERS FOR ACTUATING THE CORRESPONDING BLAST VALVES, SECOND COMPRESSED GAS OPERATED PISTON AND CYLINDER ASSEMBLIES INDIVIDUAL TO SAID PHASE CIRCUIT BREAKERS AND WHICH ARE ACTUATED RESPECTIVELY BY COMPRESSED GAS WHEN INTRODUCED INTO THE INTERRUPTING CHAMBERS THEREOF, VALVE DEVICES INDIVIDUAL TO SAID SECOND PISTON AND CYLINDER ASSEMBLIES, EACH SAID VALVE DEVICE INCLUDING A GAS CHAMBER AND A VALVE MEMBER CONTROLLING AN OUTLET PORT THEREFROM, EACH SAID VALVE MEMBER BEING OPERATIVELY CONNECTED TO THE CORRESPONDING ONE OF SAID SECOND PISTON AND CYLINDER ASSEMBLIES, CONDUIT MEANS INTERCONNECTING EACH SAID GAS CHAMBER WITH THE CYLINDER ELEMENT OF A SECOND PISTON AND CYLINDER ASSEMBLY BELONGING TO THE CIRCUIT BREAKER OF AN ADJACENT PHASE, THROTTLE VALVE CONTROLLED CONDUITS INTERCONNECTING ALL OF SAID AIR CHAMBERS, AND CONDUIT MEANS CONNECTING THE OUTLET PORTS OF SAID GAS CHAMBERS WITH SAID FIRST PISTON AND CYLINDER ASSEMBLIES.