Blind bolt installation tool with preloaded torque-responsive driving mechanism

Claim 1

IN A TOOL FOR SETTING A BOLT-TYPE FASTENER COMPRISING RESPECTIVE NUT AND SCREW ELEMENTS HAVING WRENCHING SURFACES AT THE SAME END OF THE FASTENER, IN COMBINATION: INNER AND OUTER WRENCHING MEMBERS, ONE TELESCOPED WITHIN THE OTHER; MEANS FOR HOLDING ONE OF SAID MEMBERS AGAINST ROTATION; AND MEANS FOR TRANSMITTING ROTATION TO THE OTHER MEMBER, SAID LAST MEANS COMPRISING PARTS RELATIVELY SHIFTABLE AXIALLY AND HAVING LIMITED ROTATIVE MOVEMENT WITH RESPECT TO ONE ANOTHER, ONE OF SAID PARTS TRANSMITTING DRIVE TO SAID OTHER MEMBER AND THE OTHER OF SAID PARTS RECEIVING DRIVE FROM A MOTOR, AND TORQUE-REACTIVE MEANS COMPRISING INTERENGAGING SURFACES OF SAID PARTS, AT LEAST ONE OF WHICH HAS AN ANGULAR INCLINATION WITH REFERENCE TO THE DRIVING AXIS OF THE TOOL, THEREBY COUPLING SAID PARTS IN A MANNER TO SUBSTANTIALLY ELIMINATE RESISTANCE TO RETRACTION OF SAID ONE PART WHEN TRANSMITTING TORQUE, WHEREBY SAID ONE PART MAY RETRACT IN UNISON WITH THE AXIAL MOVEMENT OF ONE OF SAID FASTENER ELEMENTS WITH RESPECT TO THE OTHER AS THE FASTENER IS CLOSED AGAINST PARTS TO BE FASTENED.