Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Head driving structure
Patent
1993-01-22
1994-04-12
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Head driving structure
411410, 411919, F16B 2300, F16B 3506
Patent
active
053020685
ABSTRACT:
An improved fastener having a non-circular head with a concave recess providing a datum useful in centering the head relative to a non-circular socket of a driving member is disclosed. The recess may have a frusto-conical wall defining an upper, circular edge or substantially triangular walls defining an upper, non-circular edge. An improved tool useful to drive the improved fastener is also disclosed. In the improved tool, a driving member has a tubular extension with a non-circular socket, and a centering pin is axially movable toward and extended position, in which a convex end of the centering pin fits into the concave recess of the screw head when the socket of the tool extension is axially fitted over the fastener head. The centering pin is biased toward the extended position.
REFERENCES:
patent: 2353531 (1944-07-01), Whitney
patent: 3283638 (1966-11-01), Ansingh
patent: 3396765 (1968-08-01), Ridenour
patent: 3888144 (1975-06-01), Parsons
patent: 4674367 (1987-06-01), Aab et al.
Dewey George G.
Janusz Michael
Illinois Tool Works Inc.
Wilson Neill R.
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