Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Thread or shank structure
Patent
1980-01-17
1982-05-11
Britts, Ramon S.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Thread or shank structure
F16B 2500
Patent
active
043290990
ABSTRACT:
A self-drilling and self-extruding fastener having a constant cross section stem and a tapering end portion terminating in a sharp point. The stem is provided with a pair of screw threads of like configuration. The tapering portion is provided with a third thread which begins at the pointed forward end in a very steep lead angle which functions as a drilling portion and thereafter the lead angle decreases so that the third thread may function to extrude the metal surrounding a guide opening formed by the drilling portion. Depending upon the screw thread configurations, one or both of the screw threads cooperate with the third thread to further extrude sheetmetal surrounding the guide opening into a cylindrical bore, after which the screw threads self-tap into the wall of the cylindrical bore of the projection and thereby firmly grip the sheetmetal.
REFERENCES:
patent: Re28111 (1974-08-01), Laverty
patent: 408531 (1889-08-01), Rogers
patent: 1749903 (1930-03-01), Cannon
patent: 1802668 (1931-04-01), Newton
patent: 2314391 (1943-03-01), De Vellier
patent: 3277769 (1966-10-01), Lippmeier
patent: 3514918 (1970-11-01), Johnson
patent: 3861269 (1975-01-01), Laverty
patent: 3942405 (1976-03-01), Wagner
patent: 4027573 (1977-06-01), Laverty
patent: 4241638 (1980-12-01), Shimizu et al.
Miyake Hidenori
Shimizu Mituo
Britts Ramon S.
Houle Guy
Kabushiki Kaisha Yamashina Seikosho
Mitchell Robert
Swabey Alan
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