| 摘要 |
PROBLEM TO BE SOLVED: To prevent the entry of a water from the outside to the inside of a door via a cylinder lock mounted on the door. SOLUTION: The cylinder lock 1 comprises a first cylinder 13, a second cylinder 14 fitted into the first cylinder 13 in a rotatable and lockable manner, and a nut 12 threaded to the first cylinder 13 at the outside for abutting the inner face of the door 2. A first O-ring 31 is laid between the first cylinder 13 and the second cylinder 14 and a second O-ring 49 is laid between the inner face of the door 2 and a front end face 12a of the nut 12. A third O-ring 53 is laid between the outer periphery of the first cylinder 13 and the inner periphery of the nut 12.
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