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
1988-12-05
1991-01-01
Smith, Gary L.
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
411417, 411426, F16B 2500
Patent
active
049814060
ABSTRACT:
A screw or bolt has a conventional threaded shank and a tapered pilot or lead end for easy entry to a threaded receptacle or nut. A pilot lead extends axially from the end of the shank. In one form, the pilot is cylindrical having an axis that either intersects or is parallel to the axis of the shank. Partial threads extend around the portion of the periphery of the pilot and an unthreaded transition surface angularly spaced from, transversely opposite, the partial threads extends to the outer surface of the shank. In another form, the pilot is elliptical having partial threads extending over a portion of its periphery and an unthreaded surface transversely opposite the pilot threads.
REFERENCES:
patent: 328139 (1885-10-01), Patten
patent: 2703419 (1955-03-01), Barth
patent: 3681963 (1972-08-01), Muenchinger
patent: 3724315 (1973-04-01), Sygnator
patent: 3942406 (1976-03-01), Egner
patent: 4042342 (1977-08-01), Muenchinger
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patent: 4235149 (1980-11-01), Veldman
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patent: 4630985 (1986-12-01), Simons
patent: 4789288 (1988-12-01), Peterson
patent: 4915560 (1990-04-01), Peterson
Levitte James A.
Schmidt Jonathon P.
Theisen Allan J.
Weiss Ronald G.
Ford Motor Company
Harrington Donald J.
McKenzie Frank G.
Saether F.
Smith Gary L.
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