| 摘要 |
PURPOSE:To prevent the falling-off of a rotary part, by providing a face on which an open groove is brought into relatively contact with an engaging member by the rotation of a rotary part, inclining the face against the rotary shaft of the rotary part and providing contacting parts for the alignment of the position of the engaging member at both longitudinal ends of the open groove. CONSTITUTION:A cover 9 is provided with an engaging member 12 and an outer cylinder surface of a flange part of a warp 3 is provided with an open groove 13. The open groove 13 is inclined or warped against the rotary shaft 0-0 of the rotary part. The falling off of the rotary part can be inhibited even in the case of accidental intrusion of the engaging member 12 into the open groove 13, by the contact of the engaging member 12 with the inner wall of the open groove 13. A contacting part 14 is placed at the upper part of the open groove 13 and another contacting part 15 is placed at the lower part to simplify the position alignment of the engaging member 12 and the open groove 13 in the case of extraction or insertion of the rotary part. |
