Disconnectible pivot joints for machine construction

Claim 1

A READILY DISCONNECTIBLE PIVOT JOINT FOR MACHINE CONSTRUCTION CAPABLE OF REASSEMBLY WITHOUT THE NECESSITY OF REPLACING PARTS AND PROVIDED WITH AN EXPANSIBLE PRECISION STUD, AND TWO MACHINE ELEMENTS FORMED WITH OPENINGS, ONE LARGER THAN THE OTHER, WITHIN THE SMALLER OF WHICH THE STUD IS EXPANDED TO PROVIDE A GRIPPING MOUNTING FOR THE STUD AND WITHIN THE LARGER OF WHICH THE STUD IS ROTATABLE, SAID STUD HAVING (A) AN EXTERNAL FINISHED CYLINDRICAL SURFACE, (B) AN AXIALLY THREADED BORE, THE THREADED PORTION OF WHICH EXTENDS WITHIN LIMITS FORMED BETWEEN PLANES DEFINED BY THE OUTSIDE FACES OF THE MACHINE ELEMENTS, AND (C) A SLIT EXTENDING THROUGHOUT THE LENGTH OF THE EXTERNAL SURFACE OF THE STUD TO ENABLE ITS EXPANSION IN DIAMETER, IN COMBINATION WITH (D) A SCREW HAVING A CONICAL HEAD ENGAGING THE BORE OF THE STUD TO PROVIDE A SINGLE RING OF CONTACT WITH THE BORE OF THE STUD AND LOCATED ALSO BETWEEN THE OUTSIDE FACES OF THE MACHINE ELEMENTS, AND (E) A THREADED PORTION OF UNIFORM DIAMETER ENGAGING THE THREADED BORE OF THE STUD TO FORM IDENTICAL SUCCESSIVE RINGS OF CONTACT WITH THE THREADS IN THE BORE, THE CONICAL HEAD BEING EXPOSED AT THE END OF THE STUD OUTSIDE THE THREADED BORE TO CAUSE THE RINGS OF CONTACT BETWEEN THE BORE AND THE THREADED AND HEAD PORTIONS OF THE SCREW WHEN TURNED INTO THE STUD TO WEDGE APART AND SUPPORT UNIFORMLY THE THREADED BORE IN THE STUD AGAINST THE OPENING IN THE MOUNTING ELEMENT WITH A GRIPPING ENGAGEMENT BY THE STUD AND TO EXPAND THE STUD TO THE SAME EXTENT WITHIN THE OPENING OF THE ROTATABLE ELEMENT AS WITHIN THE MOUNTING ELEMENT AND TO FORM A BEARING WITH PREDETERMINED CLEARANCE WITHOUT FLARING PERMANENTLY THE ENDS OF THE STUD.