| 摘要 |
PURPOSE:To make it possible to attach and detach a ring to and from a ring holder readily, by equipping part of the peripheral edge of a ring hole bored through a ring holder with a circular arc-shaped engaging end and setting a movable member having a fixing edge to be engaged with the engaging end. CONSTITUTION:A ring hole 8 to be engaged with a flange 2 of a ring 1 is bored through a ring holder 6. A peripheral face 8a of the hole 8 is protrusively equipped with an engaging end 9 having an approximately U-shaped section along about 2/3 the circumference of the hole in the circumferential direction. The engaging end has its plane which is symmetric with respect to left and right and formed in a circular arc. A movable member 14 to fix and release the ring 1 engaged with the ring hole 8 of the ring holder 6 is set at the under surface in the vicinity of the front of the ring holder 6 and opposingly to the engaging end 9. Furthermore, the movable member is movably laid in the horizontal direction with respect to a dent part 11 of the ring holder 6. And the movable member 14 is equipped with a circular arc-shaped fixing edge 15 which works cooperatively with the engaging end 9 to detachably hold the ring 1. |
