| 摘要 |
<p>A lock piece is provided in the inner part of a tumbler. Size of a clearance formed between the side of a lock groove engaging portion of the lock piece and the side of a lock groove is determined to be smaller than size of a clearance formed between the side of a lock condition holding portion of the tumbler and the side of a lock groove. When the key is inserted being given a torque in the rotating direction, the lock groove engaging portion is engaged with the side of the lock groove, and the lock condition holding portion of the tumbler is maintained to be separate from the side of the lock groove. Due to the foregoing, the lock condition holding portion is prevented from being caught on the side of the lock groove. <IMAGE></p> |
