Self-locking threaded fasteners

Details Self-locking threaded fasteners Self-locking threaded fasteners

1994-02-07

1996-01-16

Wilson, Neill R.

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

Externally threaded fastener element, e.g., bolt, screw, etc.

Thread or shank structure

411433, 411436, 411902, 411909, 29447, F16B 3504, F16B 3716, B23P 1102

Patent

active

054842441

ABSTRACT:
A threaded fastener with a shape memory alloy (SMA) coatings on its threads is disclosed. The fastener has special usefulness in high temperature applications where high reliability is important. The SMA coated fastener is threaded into or onto a mating threaded part at room temperature to produce a fastened object. The SMA coating is distorted during the assembly. At elevated temperatures the coating tries to recover its original shape and thereby exerts locking forces on the threads. When the fastened object is returned to room temperature the locking forces dissipate. Consequently the threaded fasteners can be readily disassembled at room temperature but remains securely fastened at high temperatures.
A spray technique is disclosed as a particularly useful method of coating of threads of a fastener with a shape memory alloy.

REFERENCES:
patent: 3416823 (1968-12-01), Auer
patent: 4198081 (1980-04-01), Harrison et al.
patent: 4619568 (1986-10-01), Carstensen
patent: 4880343 (1989-11-01), Matsumoto
patent: 5133631 (1992-07-01), Beach
patent: 5265456 (1993-11-01), Kennedy et al.
patent: 5366331 (1994-11-01), Erbes

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