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
1996-04-19
1998-09-01
Lindsey, Rodney M.
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
411411, F16B 2500
Patent
active
058001077
ABSTRACT:
A self-tapping, screw-type anchor capable of being turned into a hole drilled in masonry whose hardness renders the wall of the hole highly resistant to a tapping action. The anchor includes a thread forming a helical ridge on the root of the anchor, the thread having a profile defining a pair of opposing curvilinear flanks rising above the root and converging toward a crest. The curvature of the flanks which is preferably hyperbolic, creates a crest having a small included angle adapted to penetrate the wall of the hole, the crest being supported on a relatively broad base that merges with the root to firmly secure the thread thereto and thereby prevent deformation or mutilation of the thread as the anchor is being turned into the hole.
REFERENCES:
patent: Re626 (1858-11-01), Sloan
patent: 113006 (1871-03-01), Bidwell
patent: 1229560 (1917-06-01), Whiteman
patent: 2382019 (1945-08-01), Miller
patent: 2512082 (1950-06-01), Bainbridge
patent: 4527932 (1985-07-01), Onasch
patent: 4799844 (1989-01-01), Chuang
patent: 4861210 (1989-08-01), Frerejacques
patent: 5188496 (1993-02-01), Giannuzzi
patent: 5544993 (1996-08-01), Harle
Giannuzzi Anthony C.
Giannuzzi Louis N.
Ebert Michael
Estremsky Gary
Lindsey Rodney M.
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