Fluid driven rotary top spindle with fluid drive means

Claim 1

A HIGH SPEED TAPPING DEVICE COMPRISING A FRAME HAVING A TOP SUPPORT PEDESTAL AND A BOTTOM SUPPORT PEDESTAL MOUNTED THEREON IN SPACED APART RELATIONSHIP, A DRIVE SHAFT ROTATABLY SUPPORTED BY SAID TOP PEDESTAL, A CYLINDRICAL PASSAGEWAY FORMED IN SAID BOTTOM SUPPORT PEDESTAL COAXIAL WITH SAID DRIVE SHAFT, A DRIVEN SHAFT OF SMALLER DIAMETER THAN THE PASSAGEWAY IN SAID BOTTOM PEDESTAL, MEANS SUPPORTING SAID DRIVEN SHAFT IN THE PASSAGEWAY FOR ROTATION COAXIAL WITH SAID DRIVE SHAFT AND FOR AXIAL MOVEMENT RELATIVE THERETO, SAID SUPPORT MEANS COOPERATING WITH SAID DRIVEN SHAFT TO CLOSE THE UPPER END OF THE PASSAGEWAY, A COUPLING CONNECTING SAID DRIVE SHAFT IN SAID DRIVEN SHAFT FOR SIMULTANEOUS ROTATION WHILE PERMITTING RELATIVE AXIAL MOVEMENT, A COLLAR ROTATABLY MOUNTED ON SAID DRIVEN SHAFT AND AXIALLY MOVABLE THEREWITH, SAID COLLAR HAVING A PORTION THEREOF IN ENGAGEMENT WITH SAID FRAME INTERMEDIATE SAID PEDESTALS TO PRECLUDE ROTATION THEREOF, A PISTON MOUNTED ON SAID DRIVEN SHAFT WITHIN THE CYLINDRICAL PASSAGEWAY AND OF SMALLER DIAMETER THAN THE CYLINDRICAL PASSAGEWAY, A CHUCK MOUNTED ON THE END OF SAID DRIVEN SHAFT FOR RELEASABLY RETAINING A TAP THEREIN, MEANS TO SUPPLY AIR TO SAID CYLINDER TO MOVE THE TAP INTO OPERATIVE ENGAGEMENT WITH THE WORKPIECE, SAID LAST-NAMED MEANS INCLUDING A SOLENOID VALVE OPERABLE IN ONE DIRECTION TO VENT THE AIR IN THE CYLINDER TO THE ATMOSPHERE, RESTORING MEANS OPPOSING MOVEMENT OF SAID DRIVEN SHAFT BY SAID PISTON, A HYDRAULIC GEAR MOTOR MOUNTED ON SAID TOP SUPPORT PEDESTAL AND OPERATIVE TO ROTATE SAID DRIVE SHAFT IN EITHER DIRECTION, MEANS FOR SUPPLYING HYDRAULIC FLUID TO ROTATE SAID MOTOR, SAID LASTNAMED MEANS INCLUDING A SOLENOID OPERABLE IN ONE DIRECTION TO REVERSE THE DIRECTION OF ROTATION OF SAID DRIVE SHAFT, AND A LIMIT SWITCH MOUNTED ON SAID FRAME AND ENGAGEABLE BY SAID COLLAR TO EFFECT OPERATION OF SAID SOLENOID VALVE TO REVERSE THE DIRECTION OF ROTATION OF THE HYDRAULIC MOTOR AND TO OPERATE SAID SOLENOID AIR VALVE TO VENT THE AIR CONTAINED IN SAID CYLINDER TO THE ATMOSPHERE.