Reciprocatory pneumatic motor

Claim 1

A RECIPROCATORY PNEUMATIC MOTOR WITH PNEUMATIC SELF-CONTAINED AUTOMATIC PISTON RETURN, SAID MOTOR COMPRISING A CYLINDER HAVING OPPOSITE FIRST AND SECOND END WALLS AND HAVING A CYLINDER BORE WITH A PNEUMATIC FLUID SERVICE PORT NEAR ONE END THEREOF AND A WORKING CHAMBER ADJACENT SAID SERVICE PORT, A PISTON HAVING A PISTON HEAD RECIPROCABLE IN SAID BORE AND A HOLLOW PISTON ROD EXTENDING FROM SAID PISTON HEAD THROUGH SAID SECOND END WALL, SAID PISTON ROD HAVING AN INNER RETURN AIR STORAGE CHAMBER THEREIN AND SAID CYLINDER HAVING AN OUTER RETURN AIR CHAMBER BETWEEN SAID CYLINDER BORE AND SAID PISTON ROD COMMUNICATING WITH SAID INNER RETURN AIR CHAMBER, SAID PISTON HEAD HAVING A FLUID PASSAGEWAY EXTENDING THERETHROUGH FROM SAID WORKING CHAMBER TO SAID RETURN AIR STORAGE CHAMBER, AND A ONE-WAY VALVE MOUNTED ON SAID PISTON AND HAVING A VALVE MEMBER MOVABLE BETWEEN A CLOSED POSITION PREVENTING FLUID FLOW FROM SAID RETURN AIR STORAGE CHAMBER TO SAID WORKING CHAMBER AND AN OPEN POSITION EFFECTING FLUID FLOW FROM SAID WORKING CHAMBER INTO SAID RETURN AIR STORAGE CHAMBER, SAID VALVE HAVING A SPRING NORMALLY URGING SAID VALVE MEMBER TOWARD SAID CLOSED POSITION, SAID HOLLOW PISTON ROD HAVING A PORT THEREIN ESTABLISHING COMMUNICATION BETWEEN SAID OUTER AND INNER RETURN AIR CHAMBERS AND SAID SECOND END WALL HAVING A CLOSURE PORTION ENTERING INTO CLOSING RELATIONSHIP WITH SAID PISTON ROD PORT IN RESPONSE TO THE ARRIVAL OF SAID PISTON ROD AT A PREDETERMINED LOCATION DURING ITS OUTER STROKE, SAID PISTON ROD HAVING AN ANNULAR PORTION EXTENDING INTO CLOSE PROXIMITY TO SAID CYLINDER BORE ON THE OPPOSITE SIDE OF SAID PISTON ROD PORT FROM SAID SECOND END WALL.