Unfastening prevention device

Details Unfastening prevention device Unfastening prevention device

2007-02-06

2007-02-06

Saether, Flemming (Department: 3677)

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

Headed fastener element with nut, washer, securing means or cap

Cap over the head

C411S429000, C411S910000

Reexamination Certificate

active

10540626

ABSTRACT:
An object of the present invention is to provide an unfastening prevention device which has nothing projecting outside, and can prevent unfastening at either head or distal end of a bolt.An unfastening prevention is attained by covering a cap (6, 16) to screwed up fastening means formed of a bolt (2) and a nut (3). In a groove (6a,16a) formed on an inner surface of the cap (6, 16) an outer periphery of a spring ring (8) is engaged, an inner periphery of the spring ring being engaged in a groove (7a) of a holder (7), restricting axial direction (2a) and resulting in slip out prevention. Even when a torque is given on the cap (6, 16), the cap idles, fastening condition does not change and unfastening prevention is attained.

REFERENCES:
patent: 1451476 (1923-04-01), Schieber
patent: 3333439 (1967-08-01), Bessette
patent: 4427326 (1984-01-01), Hobson et al.
patent: 5730567 (1998-03-01), Haseley et al.
patent: 5749690 (1998-05-01), Kutz
patent: 5752795 (1998-05-01), D'Adamo
patent: 6142579 (2000-11-01), Thiel
patent: 2001-330020 (2000-11-01), None
patent: 2002-039146 (2002-02-01), None

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