Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Head driving structure
Reexamination Certificate
2006-08-29
2006-08-29
Hail, III, Joseph J. (Department: 3723)
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Head driving structure
C411S002000, C411S003000, C411S004000, C411S005000, C411S910000, C411S911000, C081S460000
Reexamination Certificate
active
07097404
ABSTRACT:
A screw having a screw-threaded shank and a circular head, the head being provided with three radially extending screwdriver tip receiving portions defined between three first, off central integrally formed projections designed to become shaved-off the screw head by a pre-set force applied during tightening of the screw, and three second, integrally formed projections designed to withstand a shear force greater than the pre-set force applied during slackening of the screw.
REFERENCES:
patent: 2659952 (1953-11-01), Schlueter
patent: 4109691 (1978-08-01), Wilson
patent: 4223585 (1980-09-01), Barth et al.
patent: 5647712 (1997-07-01), Demirdogen et al.
patent: 7014403 (2006-03-01), Higganbotham et al.
patent: 567885 (1958-05-01), None
patent: 676872 (1991-03-01), None
patent: 4307633 (1994-05-01), None
patent: 199 04 053 A 1 (1999-02-01), None
patent: 0498693 (1992-08-01), None
Blakely & Sokoloff, Taylor & Zafman
Hail III Joseph J.
Muller Bryan R.
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