| 摘要 |
PURPOSE:To prevent the damaging of the plate due to the overtightening of the bolt by using the force of the spring member to push the rotating sleeve against fixed shaft so that the sleeve will not operate freely except for the time of the use. CONSTITUTION:At the center of a cover 63, a recessed part 631 is equipped, a bolt 7 and a stopper as an operating member inserted from the outside of the cover are screwed to a recessed part, and between a collar part 81 and a cover which are provided with the stopper, a spring member 9 is installed. At the time of the use, the stopper 8 is pulled out to the cover 63 side by the bolt 7, and the cover 63 is sandwiched by the bolt and the stopper 8, and on the other hand, except for the time of the unuse, by loosening the bolt 7, a rotating sleeve 2 is pressured by the elasticity of a spring member 9, and the rotating sleeve 2 is constructed not to operate. |
