| 摘要 |
<p>PROBLEM TO BE SOLVED: To surely prevent rotation of a screw body to a specific direction by a simple structure.SOLUTION: In a fastening mechanism having a screw body 10 and a washer 50 and fastening a fastened body including a first fastened member 80 and a second fastened member 90, a screw body side seat part 22 is formed on the screw body 10, a first receiving part 60 and a second receiving part 70 are formed on the washer 50, and a member side seat part 82 is formed on the first fastened member 80. A first engagement mechanism A is formed between the first receiving part 60 and the screw body side seat part 22, and when the screw body side seat part 22 intends to rotate in a direction for loosing the screw body 10 in a fastened state, the first receiving part 60 and the screw body side seat part 22 are engaged with each other so as to prevent the relative rotation. A second engagement mechanism B is formed between the member side seat part 82 and the second receiving part 70, and when the washer 50 intends to rotate in a direction for loosing the washer 50, a washer side tilt surface 110 and a member side tilt surface 120 are abutted with each other so as to prevent the relative rotation. Thus, loosening of the screw body 10 and the fastened body can be prevented by the functions of the first engagement mechanism A and the second engagement mechanism B.</p> |
