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
1997-09-03
1999-04-20
Wilson, Neill
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
411311, 411399, 411418, F16B 2500, F16B 3506
Patent
active
058951873
ABSTRACT:
A pilot screw has a head, a shank beneath the head, a tapered tip at the end of the shank, and a spiral thread surrounding the shank. A large number of spaced auxiliary threads are disposed on the tapered portion of the head. A large number of spaced secondary threads are disposed on the shank between the pitches, and plural cutting gaps are formed at the end area of the spiral thread.
REFERENCES:
patent: 234759 (1880-11-01), Eckford
patent: 465101 (1891-12-01), Richards
patent: 2263137 (1941-11-01), Oestereicher
patent: 5088869 (1992-02-01), Greenslade
patent: 5133630 (1992-07-01), Hughes
patent: 5273383 (1993-12-01), Hughes
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