Self-locking threaded fasteners
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. 13 figs.
- Inventors:
- Issue Date:
- Research Org.:
- MSE Inc
- OSTI Identifier:
- 187085
- Patent Number(s):
- 5484244
- Application Number:
- PAN: 8-192,696
- Assignee:
- MSE, Inc., Butte, MT (United States)
- DOE Contract Number:
- AC22-88ID12735
- Resource Type:
- Patent
- Resource Relation:
- Other Information: PBD: 16 Jan 1996
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; 36 MATERIALS SCIENCE; FASTENERS; DESIGN; COATINGS; ALLOYS; SPRAY COATING; TEMPERATURE DEPENDENCE; SHAPE MEMORY EFFECT; AMBIENT TEMPERATURE
Citation Formats
Glovan, R J, Tierney, J C, McLean, L L, and Johnson, L L. Self-locking threaded fasteners. United States: N. p., 1996.
Web.
Glovan, R J, Tierney, J C, McLean, L L, & Johnson, L L. Self-locking threaded fasteners. United States.
Glovan, R J, Tierney, J C, McLean, L L, and Johnson, L L. Tue .
"Self-locking threaded fasteners". United States.
@article{osti_187085,
title = {Self-locking threaded fasteners},
author = {Glovan, R J and Tierney, J C and McLean, L L and Johnson, L L},
abstractNote = {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. 13 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1996},
month = {1}
}