Pneumatic reciprocating valve

Claim 1

A PNEUMATIC VALVE FOR EFFECTING CONTINUOUS TIMED RECIPROCATION OF A WORK PISTON OR THE LIKE, COMPRISING A VALVE BODY HAVING A VALVE BORE THEREIN, AN INLET PORT, AN EXHAUST PORT AND A WORK PORT OPENING INTO SAID BORE, MEANS SUPPLYING PRESSURE FLUID TO SAID INLET PORT AND MEANS COMMUNICATING SAID WORK PORT WITH ONE SIDE OF SAID WORK PISTON, A VALVE SPOOL RECIPROCABLE IN SAID BORE AND OPERABLE UPON RECIPROCATION THEREOF ALTERNATELY TO COMMUNICATE SAID WORK PORT WITH SAID INLET AND EXHAUST PORTS WHILE CLOSING THE OTHER OF SAID TWO LAST-MENTIONED PORTS, SPRING MEANS URGING SAID SPOOL IN ONE DIRECTION TO CONNECT SAID INLET AND WORK PORTS, A CYLINDER IN SAID VALVE BODY, A PISTON RECIPROCABLE IN SAID CYLINDER AND CONNECTED TO SAID SPOOL, PASSAGE MEANS COMMUNICATING ONE END OF SAID CYLINDER WITH SAID WORK PORT TO SHIFT SAID PISTON AND VALVE SPOOL IN THE OPPOSITE DIRECTION AGAINST THE FORCE OF SAID SPRING MEANS TO CONNECT SAID WORK AND EXHAUST PORTS, AN ADJUSTABLE VALVE MEANS IN SAID PASSAGE MEANS FOR METERING THE FLOW OF PRESSURE FLUID TO SAID ONE END OF SAID CYLINDER TO PROVIDE A TIME DELAY BETWEEN THE ESTABLISHMENT OF COMMUNICATION BETWEEN SAID INLET AND WORK PORTS AND SHIFTING OF SAID SPOOL IN SAID OPPOSITE DIRECTION, SAID SPOOL BEING ADAPTED TO OPEN SAID EXHAUST PORT JUST PRIOR TO CLOSING SAID INLET PORT AND TO OPEN SAID INLET PORT JUST PRIOR TO CLOSING SAID EXHAUST PORT SO AS TO PERMIT AUTOMATIC RECIPROCATION OF SAID SPOOL AND WORK PISTON.