Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Head having counter-sinking means
Patent
1992-04-29
1993-04-20
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
411188, 411386, 411404, 411919, F16B 2300, F16B 3506
Patent
active
052036570
ABSTRACT:
A shape of the head part of the screw is improved and performance of insertion of the screw when punched and performance of fastening of the screw when seated as well as a finishing treatment upon completion of the fastening against a fastened member are improved.
The head part is made such that the upper surface having an engaging groove to with which a screw driver tool is engaged has a spherical surface, and the head part is comprised of an upper large diameter part formed with a first seat surface of inverse truncated cone shape having an outer circumference of a curved concave surface and a small diameter part formed with a second seat surface of an inverse truncated cone shape concentrically and integrally connecteed to a lower part of the large diameter part and having its outer circumference of a curved concave surface, and an annular projecting edge is formed at a connection part between the seated surfaces of the two-stage curved concave surfaces. The upper surface of the head part formed into the spherical surface is provided with a plurality of chamferred surfaces formed by recessing the edge part of the opening of the engaging groove into a cone shape. There are provided a plurality of spot facing projections extending in a longitudinal direction along the curved concave surface of the second seat surface.
REFERENCES:
patent: 366158 (1887-07-01), Dow
patent: 1151861 (1915-08-01), Brumback
patent: 3221588 (1965-12-01), Wieber
patent: 4355552 (1982-10-01), Gutshall
patent: 4655661 (1987-04-01), Brandt
patent: 4693654 (1987-09-01), Bettini
Akashi Tetuya
Iwasaki Osami
Nagoshi Eiichi
Topura Co., Ltd.
Wilson Neill R.
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