| 摘要 |
<p>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 ( 6 a, 16 a) 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 ( 7 a) of a holder ( 7 ), restricting axial direction ( 2 a) 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.</p> |
