Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Pilot end having means enhancing fastening or installation
Patent
1986-10-23
1989-07-04
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Pilot end having means enhancing fastening or installation
411413, 411417, F16B 2500
Patent
active
048446769
ABSTRACT:
A self-penetrating screw for penetrating sheet metal and then bolting a panel or other member to the penetrated sheet. The screw is hardened and has a penetrating point, a bolt-like shank and a head. The bolt-like shank is provided with machine screw threads and the tapered penetrating point has space threads with a pitch substantially greater, and preferably twice, the pitch of the machine screw thread. The screw is further characterized in having a tapered transition section joining the machine threads on the bolt-like shank with ths space threads on the self-penetrating point which transition section is specially shaped with smooth cam-like surfaces so as to (1) maximize the axial dimension of the collar-like nut integrally formed in the sheet metal by the penetrating point, (2) radially expand the internal diameter of the integral not to approximately the pitch diameter of the machine screw threads on the bolt-like shank, and (3) iron out the threads internally formed in the integral nut by the self-penetrating point.
REFERENCES:
patent: 3124408 (1964-03-01), Oestereicher
patent: 3827331 (1974-08-01), Muenchinger
patent: 3978760 (1976-09-01), Muecnchinger
patent: 4179976 (1979-12-01), Sygnator
patent: 4311423 (1982-01-01), Hirabayashi
Pheoll Manufacturing Company, Inc.
Wilson Neill R.
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