Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Thread or shank structure
Patent
1998-12-11
1999-12-14
Wilson, Neill
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Thread or shank structure
411187, 411386, 4113872, F16B 2500, F16B 3504
Patent
active
06000892&
ABSTRACT:
A wood screw is proposed for use with a material made mainly of plastic waste and wood chips. The wood screw includes a shank which has leading threads extending from the tip of the tapered portion to an intermediate point of the straight portion and have a first lead angle and a first thread angle. Trailing threads extend from the intermediate point toward a head and have a second lead angle and a second thread angle. The first lead angle is greater than the second lead angle, and the first thread angle is smaller than the second thread angle.
REFERENCES:
patent: 3124408 (1964-03-01), Oestereicher
patent: 4310272 (1982-01-01), Rich et al.
patent: 4844676 (1989-07-01), Adamok
patent: 4874278 (1989-10-01), Kawashita
patent: 5601553 (1997-02-01), Trebing et al.
Wilson Neill
Yao Seibyo Kabushiki Kaisha
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