Fasteners with expansion sleeve

Claim 1

A FASTENER ADAPTED TO BE INSERTED INTO AN ORIFICE OF A WORK PIECE AND REMOVED FROM SAID ORIFICE BY MANIPULATION OF ONLY ONE END OF SAID FASTENER, COMPRISING A THREADED SHAFT, MEANS TO ROTATE SAID SHAFT POSITIONED AT ONE END OF SAID SHAFT, A BUSHING POSITIONED ON SAID SHAFT, SAID BUSHING BEING EXPANSIBLE RADIALLY OF SAID SHAFT SAID BUSHING INCLUDING AN ELASTICALLY DEFORMABLE FEMALE SLIT RING MOUNTED ON SAID SHAFT, SAID FEMALE RING HAVING AN INTERIOR CONICAL SURFACE AND AN EXTERIOR CYLINDRICAL SURFACE, SAID FEMALE RING HAVING A FLAT ROUGHENED ANNULAR SURFACE ADJACENT TO SAID ROTATABLE MEANS, SAID ANNULAR SURFACE EXTENDING SUBSTANTIALLY PERPENDICULAR TO SAID SHAFT HAVING A DIAMETER NO GREATER THAN THE DIAMETER OF SAID FEMALE RING, AND THRUST MEANS MOUNTED ON SAID SHAFT TO EXERT AN AXIAL THRUST ON SAID FEMALE RING, SAID LAST NAMED MEANS INCLUDING A MALE MEMBER MOUNTED ON SAID SHAFT, SAID MALE MEMBER HAVING A CONICAL EXTERIOR SURFACE MATING WITH THE INTERIOR CONICAL SURFACE OF SAID FEMALE RING, SAID FEMALE RING POSITIONED BETWEEN SAID ROTATING MEANS AND SAID MALE MEMBER AND SAID FEMALE RING BEING SPLIT BY A SINGLE SLOT EXTENDING THE FULL LENGTH OF SAID FEMALE RING AND FROM THE INTERIOR TO THE EXTERIOR SURFACES OF SAID FEMALE RING, SAID THRUST MEANS ADAPTED TO EXERT AN AXIAL FORCE ON SAID BUSHING TO MOVE SAID MALE MEMBER INTO SAID FEMALE MEMBER AND THEREBY EXERT A RADIAL FORCE ON SAID SLIT FEMALE RING, SAID MALE AND FEMALE CONICAL SURFACES MAKING SUBSTANTIALLY EQUAL ACUTE ANGLES WITH THE AXIS OF SAID SHAFT AND SAID ANGLES BEING SUBSTANTIALLY GREATER THAN THE ANGLE OF REPOSE OF SAID ELASTICALLY DEFORMABLE FEMALE SLIT RING, SAID ANNULAR SURFACE BEING ADAPTED TO ENGAGE AN INNER FACING SURFACE OF A CONTIGUOUS SURFACE PLACED BETWEEN SAID ROTATING MEANS AND SAID BUSHING SO THAT THE FRICTION BETWEEN SAID ANNULAR SURFACE AND SAID INNER FACING SURFACE OF SAID CONTIGUOUS SURFACE IS SUCH THAT THE MINIMUM FRICTIONAL RESISTANCE IN THE TRAIN OF FRICTION BETWEEN SURFACES IN SAID BUSHING IN FRICTIONAL ENGAGEMETN IS LOCATED BETWEEN SAID THRUST MEANS AND SAID SHAFT ON RELATIVE ROTATION THEREOF, WHEREBY ON PLACEMENT OF THE FASTENER IN A WORKPIECE AND ON ROTATION OF SAID ROTATABLE MEANS AT SAID ONE END THEREOF IN ONE DIRCTION THE MALE MEMBER AND THE FEMALE RING ARE MOVED TOWARDS EACH OTHER TO RADIALLY EXPAND SAID FEMALE RING, AND ON REVERSE ROTATION OF SAID ROTATABLE MEANS THE FEMALE RING CONTRACTS AXIALLY FORCING SAID MALE MEMBER TO MOVE IN A DIRECTION AXIALLY AWAY FROM SAID FEMALE RING TO REDUCE SAID RADIAL FORCE.