OPTIMIZED ELASTIC BELLEVILLE FASTENER USEFUL IN EYEGLASS FRAMES

摘要

A fastener (1) useful for attaching components of an eyeglass frame together. The fastener includes a pin (2) having a smooth or fluted shank and a belleville washer (3) having a hole for receiving the shank, the hole being sized to provide an interference fit with the washer. The washer (3) 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.