| 摘要 |
When the sleeve ( 3 ) is rotated, the locking portion ( 3 B) disposed on the sleeve ( 3 ) slides against one or the other of the inclined cam surfaces ( 47 A- 1 and 47 A- 2 ), and is inserted into the engaging groove portion ( 47 B) of the locking groove portion ( 47 ). The locking portion ( 3 B) reaches the locking seat portion ( 47 b) through moving over the cam portion ( 47 a) disposed on the engaging groove portion ( 47 B). The spring washer ( 29 ) urges the locking portion ( 3 B) to be seated on the locking seat portion ( 47 b).
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