Assembly with solid state, phase transformable locking fastener

Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Thread or shank structure

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Details

411 15, 411530, 411909, B23P 1102, F16B 2100

Patent

active

055361269

ABSTRACT:
A locking assembly is formed of a first article (40), a second article (44), and a locking fastener (46) positioned between the two articles and made of a shape memory alloy material. The locking fastener (46) is dimensioned to have a first shape below the transformation temperature wherein the first article (40) and the second article (44) are not locked together, and a second shape above the transformation temperature wherein the first article (40) and the second article (44) are locked together by the locking fastener (46). In one form, the first article (40) has a cylindrical bore (42) therein, the second article (44) is a cylinder that fits within the bore (42), and the locking fastener (46) is a helical coil or an annular ring having a radial slot therethrough, placed between the cylinder and the wall of the bore.

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Tom Borden, "Shape Memory Alloy Fastener Rings," 22 page unpublished preprint (May 1990).
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Tom Borden, "Shaping Up Fastener Rings", Machine Design, 4 page reprint (Oct. 1991).
TiNi Alloy Company, "Introduction to Shape Memory Alloys", Thin Film Shape Memory Alloys, TiNi Pneumatic Valves, Lightweight Memory-Metal Pin Puller, and Frangibolt.TM.. Package of information received from TiNi Alloy Company by the inventor on about Feb. 8, 1992.
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