| 摘要 |
A stopper to be contacted with a moving rod before it is located at the most receded position such that the elastic engagement between a female screw and an elastic engaging nail is in the state capable of clutch slipping is provided between a housing and the moving rod. A fall-off preventing unit to be contacted with the moving rod at the time the moving rod is located at the most advanced position is provided for preventing fall-off of the moving rod from the other member between the moving rod and another member.
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