Rivet gun device

Claim 1

A RIVET GUN DEVICE FOR SETTING FASTENERS OF THE TYPE HAVING AN ELONGATE MANDREL AND A SLEEVE THEREON TO BE SET RELATIVE THERETO, SAID DEVICE COMPRISING A HANDLE, A RIGID FRAME FIXEDLY ATTACHED TO ONE END OF SAID HANDLE, SAID FRAME HAVING A BORE THERETHROUGH, A TUBULAR BODY MEMBER MOUNTED ON SAID FRAME AND HAVING A NOSE PIECE AT THE FRONT END THEREOF, SAID NOSE PIECE HAVING AN AXIAL OPENING THEREIN FOR RECEIVING THE MANDREL OF THE FASTENER TO BE SET THEREIN, SAID BODY MEMBER BEING DISPOSED IN COAXIAL ALIGNMENT WITH THE BORE OF SAID FRAME, A HOLLOW COLLET RECEIVING HEAD MOUNTED WITHIN SAID TUBULAR BODY MEMBER FOR AXIAL MOVEMENT RELATIVE THERETO, A PAIR OF MANDREL GRIPPING COLLETS POSITIONED WITHIN SAID COLLET RECEIVING HEAD REARWARDLY OF SAID NOSE PIECE AND HAVING OPPOSED GRIPPING JAWS, SAID COLLETS BEING DISPOSED IN ENGAGING RELATION WITH SAID NOSE PIECE WHEN IN A FORWARD RELEASE POSITION AND BEING AXIALLY RETRACTIVE WITH SAID COLLET RECEIVING HEAD AND RELATIVE TO THE NOSE PIECE IN A MANDREL GRIPPING DIRECTION FOR GRIPPING THE INSERTED END OF THE MANDREL BETWEEN THE JAWS THEREOF, AN ELONGATE ACTUATOR MEMBER POSITIONED WITHIN SAID BODY MEMBER AND BEING CONNECTED AT ITS FORWARD END WITH SAID COLLET RECEIVING HEAD AND BEING AXIALLY SHIFTABLE RELATIVE TO SAID BODY MEMBER, AN ACTUATING LEVER, COOPERATING MEANS ON ONE END OF SAID LEVER AND SAID FRAME PIVOTALLY MOUNTING ON SAID LEVER AND THE FRAME FOR RELATIVE PIVOTAL MOVEMENT THEREBETWEEN AND UPON PIVOTING MOVEMENT PRODUCING RETRACTIVE MOVEMENT OF SAID ACTUATOR MEMBER AND COLLET RECEIVING HEAD AND THE COLLETS CARRIED THEREBY, SAID LEVER BEING CAPABLE OF READY DETACHMENT FROM SAID FRAME AND BEING CAPABLE OF READY RE-ATTACHMENT THERETO TO A DEFINE A DIFFERENTLY POSITIONED PIVOTAL AXIS TO THEREBY ALLOW THE RELATIVE SIZES OF THE RESPECTIVE EFFORT AND RESISTANCE ARMS OF THE LEVER TO BE VARIED, YIELDABLE MEANS INTERPOSED BETWEEN SAID BODY MEMBER AND SAID COLLET RECEIVING HEAD FOR YIELDABLY RESISTING RETRACTIVE MOVEMENT OF THE LATTER, AND AN ADJUSTMENT MEMBER ADJUSTABLY CONNECTED WITH THE REAR PORTION OF SAID ACTUATOR MEMBER AND BEING VARIOUSLY ADJUSTABLE RELATIVE THERETO TO VARIOUSLY PRESET THE AXIAL POSITION OF THE COLLETS WITH RESPECT TO SAID NOSE PIECE WHILE THE COLLETS ARE IN THE RELEASED POSITION.