Pneumatic cycle timer

Claim 1

A PNEUMATIC CYCLE TIMER COMPRISING IN COMBINATION A GAS PRESSURE SOURCE, A THREE-WAY VALVE IN GAS SUPPLY CONNECTION THROUGH ONE PORT WITH SAID SOURCE, IN VENT CONNECTION THROUGH A SECOND PORT IN GAS DELIVERY CONNECTION THROUGH THE THIRD PORT WITH A TIMING CIRCUIT, SAID TIMING CIRCUIT COMPRISING A CLOSED GAS FLOW PATH PROVIDED WITH A FIRST THROTTLING MEANS, A FIRST CHECK VALVE, A SECOND THROTTLING MEANS AND A SECOND CHECK VALVE, SAID FIRST AND SECOND CHECK VALVES BEING ADAPTED TO PERMIT FLOW OF GAS IN OPPOSITE DIRECTIONS REFERRED TO THEIR ASSOCIATED THROTTLING MEANS AND SAID THIRD PORT BEING CONNECTED TO A POINT IN SAID TIMING CIRCUIT OPPOSITE THE SIDES OF SAID FIRST AND SECOND THROTTLING MEANS ADJACENT SAID CHECK VALVES, A SUBSTANTIALLY CONSTANT VOLUME GAS STORAGE CAPACITY IN OPEN COMMUNICATION WITH SAID CHECK VALVES ON THE SIDES OPPOSITE SAID THROTTLING MEANS, AND MEANS IN OPEN COMMUNICATION WITH SAID GAS STORAGE CAPACITY FOR CAUSING ACTUATION OF SAID THREE-WAY VALVE TO PERMIT GAS FLOW FROM SAID TIMING CIRCUIT THROUGH SAID SECOND PORT AT A PRESELECTED FIRST PRESSURE AND FROM SAID SOURCE THROUGH SAID THIRD PORT AT A PRESELECTED SECOND PRESSURE LOWER THAN SAID FIRST PRESSURE, AND A SIGNAL PRESSURE SENSING CONDUIT IN OPEN COMMUNICATION WITH SAID THIRD PORT.