Optimized elastic belleville fastener useful in eyeglass frames

Details Optimized elastic belleville fastener useful in eyeglass frames Optimized elastic belleville fastener useful in eyeglass frames

1993-03-23

1995-03-07

Wilson, Neill R.

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

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

Lap bolt or fastener

411353, 411521, 411909, 29 20, 295251, F16B 2100, F16B 2118, B23P 1102

Patent

active

053951930

ABSTRACT:
A fastener useful for attaching components of an eyeglass frame together. The fastener includes a pin having a smooth or fluted shank and a belleville washer having a hole for receiving the shank, the hole being sized to provide an interference fit with the washer. The washer is made from a titanium nickel shape memory alloy in an optimized elastic condition. The optimized elastic condition is provided by work hardening a sheet of Ni-Ti and cutting or stamping the washer out of the sheet. The washer is also plastically deformed into a conical shape.

REFERENCES:
patent: 2230916 (1941-02-01), Tinnerman
patent: 3203302 (1965-08-01), Frederick
patent: 3367228 (1968-02-01), King, Jr.
patent: 3619478 (1971-11-01), Staiger
patent: 4450616 (1984-05-01), Morita
patent: 4624092 (1986-11-01), Baginski
patent: 4880343 (1989-11-01), Matsumoto
patent: 5224248 (1993-07-01), Brilliant

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