Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Threaded fastener locked to a discreet structure – Nut – and means to engage substructure on its opposite faces...
Patent
1994-08-22
1996-07-02
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Threaded fastener locked to a discreet structure
Nut, and means to engage substructure on its opposite faces...
411180, 294322, F16B 3704, B23P 1100
Patent
active
055315526
ABSTRACT:
A method of making a self-attaching nut or pierce nut, such as a round nut having cylindrical pilot, an annular groove surrounding the pilot and a panel supporting flange portion surrounding the groove, wherein the groove bottom wall includes a plurality of circumferentially spaced anti-rotation protuberances separated by radial channels and wherein the flange portion is preferably tapered toward the pilot portion to provide a re-entrant groove which provides a secure installation to a panel. The method includes first forming a nut blank having the general configuration of the nut with a continuous annular protuberance and an annular flange portion which extends perpendicular to the groove bottom wall. A forming punch having a cylindrical axial bore and a plurality of generally rectangular or trapezoidal circumferentially spaced projections on the punch forming end is then driven into the groove to telescopically receive the pilot portion and driven against the continuous annular protuberance to form a plurality of circumferentially spaced protuberances which extend from the pilot portion to a midportion of the groove bottom wall. In the most preferred embodiment, the projections on the punch are spaced from the bore, such that semi-circular bridging portions are formed integral with the pilot portion and adjacent protuberances.
REFERENCES:
patent: 3648747 (1972-03-01), Steward
patent: 3810291 (1974-05-01), Ladouceur
patent: 3878599 (1975-04-01), Ladouceur et al.
patent: 4708556 (1987-11-01), Pamer et al.
Takahashi Takao
Takehara Hiroshi
Multifastener Corporation
Wilson Neill R.
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