Patent
1989-03-31
1990-01-30
Combs, E. Michael
10 27R, B21K 144, B21K 156
Patent
active
048963917
ABSTRACT:
A self-locking fastener includes an externally threaded fastener element provided with an aperture which is off-center with respect to the axis of the fastener element. Received within the aperture is a locking element which may be of plastic, preferably a polyimide such as VESPEL, for use under high temperature conditions. The aperture is preferably round while the locking element is preferably square, for ease of fabrication, although metal locking elements may be used and the aperture may be of other shapes. The length of the locking element is coordinated and correlated with the major and minor diameters of the fastener such that the end faces of the locking element substantially occupy a significant portion of the valleys between adjacent crests, rather than matching the thread profile, in order to provide effective locking as required by certain designated specifications set forth herein. Ease of fabrication is an advantage of the self-locking fastener as well as variety of configurations of the locking element, various forms of which are disclosed.
REFERENCES:
patent: 2663344 (1953-12-01), Burdick
patent: 3227198 (1966-01-01), Coyle
patent: 3914178 (1975-10-01), Fineran et al.
Combs E. Michael
Long-Lok Fasteners Corporation
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