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
1987-03-16
1988-11-29
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
408229, F16B 2500
Patent
active
047877928
ABSTRACT:
A drilling and thread forming fastener is provided having a pilot end with a cutting tip and a pair of flutes formed thereon. The flutes define the length of the pilot end, which is tapered in one direction only over the greater portion of its extent.
REFERENCES:
patent: 2388482 (1945-11-01), Haynes
patent: 4064784 (1977-12-01), Adler
patent: 4233880 (1980-11-01), Bjorklund et al.
patent: 4407620 (1983-10-01), Shinjo
patent: 4568229 (1986-02-01), Hulsey
Jesson George
Piacenti Frank
Szatkowski Thomas S.
USM Corporation
Wilson Neill R.
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