Screw

Details Screw Screw

1995-12-08

1999-07-06

Wilson, Neill R.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Externally threaded fastener element, e.g., bolt, screw, etc.

Head having counter-sinking means

411368, 411424, 411919, F16B 2300, F16B 3506

Patent

active

059190205

ABSTRACT:
A screw, particularly a wood screw present a combination of a threaded cylindric stem (10) merging, over an inversely frustoconical part (16) with an enlarged diameter cylindric portion (20) which is integral with an underside of a large diameter washer section (23) which, in turn is integral with a shallowly convex head portion (25). The invention is intended for wood screws usually in the range of about 6 mm and provides a reduced chance of injury by providing a smooth merging with the flat surface on which the screw head is located. Also, the screw has an improved torque characteristics making it suitable for use with power screw driving tools.

REFERENCES:
patent: 438754 (1890-10-01), Rogers
patent: 3236141 (1966-02-01), Smith
patent: 3304109 (1967-02-01), Schuster
patent: 3313197 (1967-04-01), Knohl
patent: 3828422 (1974-08-01), Schmitt
patent: 3882752 (1975-05-01), Gutshall
patent: 3898706 (1975-08-01), Rivalland et al.
patent: 4254542 (1981-03-01), Craig
patent: 4572720 (1986-02-01), Rockenfeller et al.
patent: 4586862 (1986-05-01), Yamasaki
patent: 4621963 (1986-11-01), Reinwall
patent: 4749322 (1988-06-01), Sygnator
patent: 4763456 (1988-08-01), Giannuzzi
patent: 5141376 (1992-08-01), Williams et al.
patent: 5232322 (1993-08-01), Regensburger
patent: 5249882 (1993-10-01), Nagoshi et al.

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