| 摘要 |
PROBLEM TO BE SOLVED: To allow to pressure contact a lock ring strongly to the outer peripheral surface of a cylindrical member, by screwing a presser ring to a casing, and to allow to fasten and hold the cylindrical member strongly. SOLUTION: In an attachment 21 for connection in order to connect and fix a cylindrical member 20 to the fitting hole 16 of a casing 12, a lock ring 29 is fitted by inserting to the outer periphery of the cylindrical member 20. A packing holder 30 is neighbored and set to the locking ring 29, and a packing 32 is held allowable to joint to the outer peripheral surface of the cylindrical member 20 and the outer peripheral surface of the casing 12. A presser ring 31 is provided on the outer periphery of the lock ring 29, and it is screwed on the outer peripheral surface of the casing 12 in the condition that the cylindrical member 20 is fitted to the fitting hole 16. On the outer peripheral surface of the lock ring 29, a first contact cam face 29a corresponding contactable to the presser ring 31, and a second contact cam face 29b corresponding contactable to the packing holder 30, are formed.
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