To provide a cylinder lock highly resistant to an illegal unlocking operation.
This cylinder lock includes a plug 2 which is inserted into a cylinder case 1 in such a manner that its shaft-length-direction movement is regulated, and a sleeve 4 which is inserted into the cylinder case 1 in the state of being externally suitable for the plug 2 in such a manner as to be incapable of idly running and movable in the shaft length direction and which enables a push-in operating physical force to be imparted by an unlocking key 3 for being inserted into the plug 2. An appropriate number of tumblers 5, which open/close a shaft-length-direction movement boundary formed between the tumbler 5 and the sleeve 4 and which are driven to a movement boundary opening position by the proper unlocking key 3, so as to permit the movement of the sleeve 4 in the shaft length direction, are attached to the plug 2; and the operation of pushing in the sleeve 4 to the push-in position from an initial one can be performed.
JPS50106798A | 1975-08-22 | |||
JPH0324571U | 1991-03-13 |
Kawaoka Hideo