Thumbnut construction

Details Thumbnut construction Thumbnut construction

1991-04-16

1991-11-12

Wilson, Neill R.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Headed fastener element with nut, washer, securing means or cap

Headed bolt or screw with threads and complementary nut

411301, 411432, 411435, 403320, 4034081, F16B 3300, F16B 3716

Patent

active

050643258

ABSTRACT:
A thumbnut for use with a convex surface is provided with a plastic sheath in which the bottom face thereof has a series of projections arranged in a circumferential manner like the numerals on a clock face. Once the thumbnut is threadedly engaged with a bolt extending from the convex surface, these projections react in a ratchet-like manner with that surface. As the thumb nut is tightened the projections cause it to move alternatively from unstable "override" positions to stable "straddle" positions which effectively lock the thumbnut with respect to the convex surface, regardless of the amount of torque applied to the thumbnut.

REFERENCES:
patent: 244379 (1881-07-01), Coulter et al.
patent: 812294 (1906-02-01), Reed
patent: 830572 (1906-09-01), Cutter
patent: 887962 (1908-05-01), Reisner
patent: 1923647 (1933-08-01), Vera
patent: 1952305 (1934-03-01), Beck
patent: 2827973 (1958-03-01), Coleman
patent: 3262480 (1966-07-01), Storch
patent: 3825051 (1944-07-01), Sigmund
patent: 4068555 (1978-01-01), Volkman
patent: 4472097 (1984-04-01), Keifer et al.
patent: 4790208 (1988-12-01), Johnson

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