Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Threaded fastener locked to a discreet structure – Member or portion thereof located between substructure and...
Patent
1990-10-31
1992-02-25
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Threaded fastener locked to a discreet structure
Member or portion thereof located between substructure and...
411134, 411149, 295251, F16B 3504, F16B 3704, B23P 1102
Patent
active
050908553
ABSTRACT:
A locking fastener assembly in which coacting cam surfaces are employed to generate wedging forces in response to backing off movement of the associated nut or washer at the conclusion of the normal tightening operation, thereby urging the nut into tighter engagement with the associated bolt and at the same time removing and reversing the residual wind up in the bolt created in the normal tightening operation. Coacting locking means are provided on the confronting faces of the elements of the fastener which operate to lock up the elements following the backing off movement so as to lock in the additional tightening generated by the backing off movement. The fastener assembly may comprise a nut and a washer with the respective locking faces provided on the lower face of the nut and the upper face of the washer; may comprise the nut, an upper washer, and a lower washer with the confronting locking faces provided on the upper face of the lower washer and the lower face of the upper washer; or may comprise a bolt and a washer with the respective locking faces provided on the lower face of the head of the bolt and the upper face of the washer.
REFERENCES:
patent: 553780 (1896-01-01), Dickason
patent: 2271732 (1942-02-01), Chappurs
patent: 3077218 (1963-02-01), Ziegler
patent: 3221792 (1990-11-01), Poupitch
patent: 3417802 (1968-12-01), Oldenkott
patent: 4538313 (1985-09-01), Frieberg
patent: 4704058 (1987-11-01), Crunwell
patent: 4708555 (1987-11-01), Terry
patent: 4793752 (1988-12-01), Frieberg
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