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Pin and process for its manufacture

  • US 4,544,312 A
  • Filed: 12/24/1984
  • Issued: 10/01/1985
  • Est. Priority Date: 03/17/1981
  • Status: Expired due to Term
First Claim
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1. In combination, a pin and a collar comprising:

  • (a) the collar having;

    an internally threaded axial bore and external, longitudinally extending lobes on its outer surface, the lobes being capable of failing plastically in radial compression upon the application of a predetermined load onto them, the load being effected by a driving tool and at least one reacting sheet while threading the collar onto the pin to plastically displace collar material radially inward into the axial bore and into locking relationship with the pin;

    (b) the pin having;

    (i) a manufactured head at one end of the pin for applying a clamp-up load on the sheet;

    (ii) a shank extending longitudinally from the head to the other end of the pin;

    (iii) a plurality of regularly placed flutes extending longitudinally along the shank from the end of the pin opposite the head and ending at points spaced from the head, each flute being substantially concave outward in cross-section;

    (iv) external roll-formed threads on the shank extending from the end of the pin opposite the head past the ends of the flutes and crossing over the flutes for threaded receipt by the threads of the collar, the depth of the flutes being substantially equal to the root diameter of the external threads in the flutes;

    (v) a ridge crest on each side of the flutes and extending circumferentially at the major diameter of the threads, each of the ridge crests spanning a circumferential distance on the order of the distance across each flute at the major diameter; and

    (vi) means to restrain the pin from rotating while threading the collar onto the pin and developing the predetermined load;

    whereby, displaced collar material flows into the flutes to lock the collar to the pin upon application of the predetermined load onto the lobes.

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