Reciprocating fluid motor

Claim 1

IN A COMBINATION PNEUMATIC-HYDRAULIC PUMPING DEVICE, A PUMP HOUSING COMPRISING AN ANNULAR SHELL AND HEADER MEANS CLOSING THE OPPOSITE ENDS OF SAID SHELL, SAID HEADER MEANS DEFINING HYDRAULIC PUMPING CHAMBERS COMMUNICABLE WITH THE INTERIOR OF SAID SHELL, A PNEUMATICALLY ACTUATED PISTON RECIPROCABLE WITHIN SAID SHELL, HYDRAULIC PUMPING MEANS ATTACHED TO THE OPPOSITE SIDES OF SAID PISTON AND RECIPROCABLE WITHIN SAID HYDRAULIC PUMPING CHAMBERS UPON RECIPROCATION OF SAID PISTON IN SAID SHELL, VALVE MEANS FOR SELECTIVELY METERING PREDETERMINED QUANTITIES OF PRESSURIZED AIR INTO SAID SHELL ON THE OPPOSITE SIDES OF SAID PISTON TO EFFECT THE MOVEMENT OF SAID PISTON AND SAID HYDRAULIC PUMPING MEANS, SAID VALVE MEANS COMPRISING A VALVE HOUSING AND A PRESSURE RESPONSIVE PISTON RECIPROCABLE WITHIN SAID HOUSING, CONDUIT MEANS COMMUNICATING SAID VALVE HOUSING WITH SAID PUMP HOUSING, CHECK VALVE MEANS IN SAID VALVE HOUSING AND BEING SELECTIVELY ENGAGEABLE BY SAID PISTON MEANS IN SAID VALVE HOUSING TO COMMUNICATE PRESSURIZED AIR FROM SAID VALVE HOUSING INTO SAID CONDUIT MEANS, AND MEANS INCLUDING PROBE MEANS SLIDABLY MOUNTED IN SAID PUMP HOUSING AND ENGAGEABLE BY SAID PNEUMATICALLY ACTUATED PISTON TO EFFECT THE ACTUATION OF SAID VALVE MEANS.