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
1993-01-29
1994-08-23
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
053402510
ABSTRACT:
A pierce nut having a central pilot, a cylindrical flange portion surrounding the pilot and a groove in the flange portion having at least one inclined side wall and a bottom wall having a convex annular protuberance preferably comprising spaced arcuate protuberances extending around the pilot which deforms panel metal beneath the inclined side wall and providing anti-rotation means when the nut is attached to a metal panel. The outer groove side wall includes radial notches or grooves which receive panel metal to provide anti-torque means. The improved die button includes an annular lip having an inside piercing edge spaced from the end to pierce a smaller slug and an annular convex fillet which deforms more panel metal into the nut groove to form a secure mechanical interlock between the nut and panel.
REFERENCES:
patent: 1648026 (1927-11-01), Murray
patent: 3648747 (1972-03-01), Steward
patent: 3810291 (1974-05-01), Ladouceur
patent: 3878599 (1975-04-01), Ladouceur et al.
Takahashi Takao
Takehara Hiroshi
Multifastener Corporation
Wilson Neill R.
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