Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Head driving structure
Patent
1981-12-15
1984-07-10
Holko, Thomas J.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Head driving structure
81461, 411410, F16B 2300, F16B 3506
Patent
active
044590741
ABSTRACT:
A drive cavity for a threaded fastener which is compatible with a variety of wrench drivers having hexagon-based profiles. The drive cavity is a prismatic projection of a multi-, primarily flat-sided, profile having its radially inner margins defined by the mid-sides of a common base hexagon and its radially outer margins defined by six trapezoid sectors each centered on and outlying the corners of the base hexagon.
REFERENCES:
patent: 2969250 (1961-01-01), Kull
patent: 3295572 (1967-01-01), Wing
patent: 3584667 (1971-06-01), Reiland
patent: 4269246 (1981-05-01), Larson et al.
Dubnicka Thomas J.
Holko Thomas J.
Russell Burdsall & Ward Corporation
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