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Self-tightening Fastener

IP.com Disclosure Number: IPCOM000060640D
Original Publication Date: 1986-Mar-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

MacInnes, RD: AUTHOR

Abstract

A fastener capable of being applied with a low application force but yielding a high tightening force can be produced from a shape memory alloy which exists in a high- or low-temperature crystalline phase.

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Self-tightening Fastener

A fastener capable of being applied with a low application force but yielding a high tightening force can be produced from a shape memory alloy which exists in a high- or low-temperature crystalline phase.

One possible shape for such a fastener is a disk with a wavy edge and a central fastening hole. This shape would be cast in the high temperature, hard, austenite phase of the shape memory alloy. In use, the above fastener is cooled to temperatures stable for the deformable martensite phase. The fastener is then flattened in a press to a shape which it will retain as long as it is kept below its phase transformation temperature. In this flattened form, the fastener can then be threaded onto a post and tightened. After warming to its transformation temperature, the fastener edges will attempt to return to their original wavy shape and thereby exert a tightening force in excess of that by which the fastener was applied.

Disclosed anonymously.

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