Rotary drive fastener

Details Rotary drive fastener Rotary drive fastener

1977-11-23

1978-12-05

Holko, Thomas J.

Bridges

145 50A, F16B 2300

Patent

active

041280385

ABSTRACT:
A rotatable fastener of low torque application, the fastener being characterized by external fastener, bearing surface which comprises a hemispherical dome, said dome defining a head whereby a mating tool may apply torsional forces thereto, the fastener having formation in the dome of a blind cavity the horizontal cross-section of which appears to be concentric to the center axis of the fastener, an axis of the cavity being at an acute angle relative to the central axis of the fastening means, wherein the driving moment between the fastener and a tool is provided by the eccentric relationship of the cavity, relative to the exterior dome of the fastener.

REFERENCES:
patent: RE22681 (1945-10-01), Bugg
patent: 1300275 (1919-04-01), Johnson
patent: 2244046 (1941-06-01), Bradshaw
patent: 3302672 (1967-02-01), Walton
patent: 3369441 (1968-02-01), Kosar
patent: 3874258 (1975-04-01), Semowa et al.

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