| 摘要 |
PROBLEM TO BE SOLVED: To prevent various parts integrated into a cylinder chamber of a housing, from jumping outward to disintegrate apart during maintenance for detaching a chain. SOLUTION: A plunger 14 is inserted in a cylinder chamber 12 of a housing 11. An external thread on the outer periphery of a screw rod 17 is thread- engaged with an internal thread on the inner periphery of a rod insert hole opened at the rear end face of the plunger 14. The plunger 14 and the screw rod 17 are pressed in mutually opposed directions by a spring 21. An engaging groove 31 is formed at the outer peripheral rear end of the plunger 14, and the housing 11 is provided with a stopper insert hole 32 opened at the inner peripheral upper part of the cylinder chamber 12. A stopper member 33 is slidably inserted in the stopper insert hole 32, and the plunger 14 is prevented from slipping off by engagement between the stopper member 33 and the engaging groove 31 to prevent various parts integrated into the cylinder chamber 12, from disintegrating apart.
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