Hydro-pneumatic feed mechanism for a tool carrier

Claim 1

A MACHINE TOOL CARRIER FOR ADVANCING AND RETRACTING A TOOL TOWARD AND AWAY FROM A WORK PIECE COMPRISING A TOOL SUPPORT, A TOOL QUILL RECIPROCABLY MOUNTED IN SAID SUPPORT, SAID TOOL SUPPORT COMPRISING A CYLINDER AND SAID TOOL QUILL COMPRISING A PISTON MEANS RECIPROCABLY DISPOSED IN FLUID SEALING ENGAGEMENT WITH SAID CYLINDER, SAID PISTON MEANS FORMING ADVANCE AND RETRACT CHAMBERS WITH OPPOSITE ENDS OF THE CYLINDER, SAID QUILL MOUNTING A POWER UNIT FOR ROTATING THE DRILL, THE POWER UNIT HAVING A SHAFT DRIVEN THEREBY AND CARRYING A TOOL CHUCK, PNEUMATIC TRANSMITTING MEANS COMMUNICATING WITH THE ADVANCE CHAMBER AND SEQUENTIALLY INJECTING AN EXHAUSTING GAS INTO AND OUT OF THE ADVANCE CHAMBER, SAID RETRACR CHAMBER HAVING MEANS FOR SUPPLYING AND EXHAUSTING HYDRUALIC FLUID THEREFROM INCLUDING A FLUID RESERVOIR MEANS COMPRISING A CYLINDER HAVING A FLOATING PISTON TO DEFINE A PAIR OF CHAMBER SECTIONS, ONE CHAMBER SECTION HAVING SEQUENTIAL COMMUNICATION WITH THE PNEUMATIC TRANSMITTING MEANS AND THE OTHER CHAMBER SECTION HAVING COMMUNCATION WITH THE RETRACT CHAMBER, FLOW CONTROL MEANS INCLUDING MANUALLY SETABLE NEEDLE VALVE DISPOSED BETWEEN THE RETRACT CHAMBER AND THE OTHER CHAMBER SECTION IN RESTRICTING FLOW OF HYDRAULIC FLUID FROM THE RETRACT CHAMBER TO THE OTHER CHAMBER SECTION, CHECK VALVE MEANS DIRECTING FLOW FROM THE OTHER CHAMBER SECTION TO THE RETRACT CHAMBER, AND THROTTLE VALVE MEANS MOUNTED FOR MOVEMENT WITH SAID QUILL AND RECIPROCABLE IN FLOW OBSTRUCTING RELATION BETWEEN THE RETRACT CHAMBER AND THE OTHER CHAMBER SECTION WHEREBY THE POSITION AND THEREBY THE ACTION OF THE THROTTLE VALVE MEANS IS THE FUNCTION OF THE POSITION OF THE TOOL QUILL, AND SAID CARRIER HAVING MEANS OPERATING SAID PNEUMATIC TRANSMITTING MEANS FOR SEQUENTIALLY INJECTING AND EXHAUSTING GAS INTO AND OUT OF THE ADVANCE CHAMBER AND THE ONE CHAMBER SECTION WHILE THE RETRACT CHAMBER AND THE OTHER CHAMBER SECTION ARE ALTERNATELY FILLED AND EXHAUSTED OF HYDRAULIC FLUID.