| 摘要 |
PURPOSE:To prevent a structure member from wearing away early by providing a cam follower which is always retained at a moving position by the flat portion of a cam surface and the step portion of a slide ring. CONSTITUTION:When an axle 1 is rotated, a cam follower 19 is pushed by a concave portion 22 in a cam surface 22a of an unrotatable cam 22 to push a clutch 17 outward so that the outer tooth 17a of the clutch 17 is engaged with the inside tooth 14a of a main body, and the cam follower 19 is struck on the flat portion 22a1 of the cam surface 22a and brought into contact with a projection 25d of a slide ring 25. After that, the cam follower 19 slides with the slide ring 25 on the flat portion 22a1 of the cam surface 22a at its rotation, the cam follower 19 is received by a step portion 25c of the slide ring 25 not to move into the concave portion 22a2, and the engagement is retained. |
