Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Head driving structure
Patent
1993-11-09
1996-09-10
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Head driving structure
411919, 81436, 81460, F16B 2300, F16B 3506
Patent
active
055539831
ABSTRACT:
A recessed screw has a recess formed in the head of screw, with the recess being defined as a superimposition of two equilaterally-triangular recesses each having vertices shaped arcuate and arranged coaxially with a phase shift of 60.degree. around the screw axis. The recess thus has alternating six grooves and six driven vanes having side walls extending parallel with the axis, and an inner ridge of vane is a conically curved sticking wall inwardly slanted towards a bottom of the recess. A cross-sectional area of groove is larger than that of each vane. A driver bit has six driving vanes in conformity with the grooves and six valleys each interposed between the adjacent driving vanes and corresponding to the driven vanes in the recess, such that a biting action appears between the recess and bit, the driving vanes can be strengthened, and any conventional bit for Torx screws can be used with the recessed screw.
REFERENCES:
patent: 2777353 (1957-01-01), Willis
patent: 3584667 (1971-06-01), Reiland
patent: 4269246 (1981-05-01), Larson et al.
patent: 4646594 (1987-03-01), Tien
patent: 5219253 (1993-06-01), Shinjo
patent: 5435680 (1995-07-01), Schuster
Wilson Neill R.
Yugenkaisha Shinjo Seisakusho
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