Expanded – threaded – driven – headed – tool-deformed – or locked-thr – With means to indicate application of predetermined... – Axially deformable member or portion
Patent
1988-08-17
1990-09-25
Smith, Gary L.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
With means to indicate application of predetermined...
Axially deformable member or portion
411159, 411261, 411531, 411544, F16B 3102
Patent
active
049589709
ABSTRACT:
A graduated-load spring washer system for screws and threaded fasteners uses a deflection coil spring of slightly less than one coil with special end configurations for anti-marring. A cross-section of the coil spring is substantially trapezoidal, with the outer periphery thickness being the dimension of the trapezoid base and larger than the inner thickness dimension. When placed under the head of a threaded fastener and flattened upon tightening of the fastener, the device maintains a large tailored preload to prevent loosening even during and after stress relaxation and creep, and eliminates the need for a usual flat washer below the coil to prevent marring. The device also eliminates requirement for use of torque application measuring tools because preload can be determined by sight or tactile sensing.
REFERENCES:
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patent: 903109 (1908-11-01), Ross
patent: 1320259 (1919-10-01), Martens
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patent: 2014995 (1935-09-01), Washer
patent: 2713482 (1955-07-01), Stapleton
patent: 3503430 (1970-03-01), Tsurumoto
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patent: 4157725 (1979-07-01), Stanaitis
Rose James D.
Suder, III William H.
Billi Ron
Kalmbaugh David S.
Redman Jerry
Smith Gary L.
The United States of America as represented by the Secretary of
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