| 摘要 |
A cylinder lock is provided with means for preventing a cylinder from being extracted to improve safety against breakage of the lock. The preventing means comprises a deformable portion formed at an entrance of a keyhole of the cylinder and deformable into a radially expanded form when a force is applied to forcibly insert some object other than a correct key into the keyhole, and a stop portion formed in a casing of the cylinder lock for preventing the deformable portion in the deformed form from being extracted. |
