| 摘要 |
PURPOSE:To obtain a moving mechanism free from risk that the engagement of a ratchet tooth and a catch are not released by constituting a mechanism so that the depth of a tooth space of a 2nd ratchet tooth may be made narrower than that of a 1st ratchet tooth. CONSTITUTION:A cam ring 4 is provided with a part largely projecting from the outer peripheral part toward the outside in a radial direction, and four ratchet teeth 4b to 4d are projectingly provided on the front side of the projecting part. Then, the depth of the tooth space of the 2nd ratchet tooth 4C is made narrower than that of the 1st ratchet tooth 4b. Thus, such the state that the catch 8a for a lever 8 is engaged with the ratchet tooth 4C is released by applying a force smaller than the conventional one. And also, even in the case the tooth space of the ratchet tooth 4C becomes larger than the original one due to the secular change (wear), a gap between the leading end part 14a of a movable yoke 14 for an electromagnetic plunger 11 and a hole 13a of a fixed yoke 13 can be prevented from becoming equal to or exceeding a prescribed value when the electromagnetic plunger 11 is not operated, that is, when the catch 8a is engaged with the ratchet tooth 4C. |
