| 摘要 |
PROBLEM TO BE SOLVED: To provide a cylinder lock which is improved in security against unauthentic unlocking of a lever tumbler lock or a rotary disk tumbler lock, to thereby enhance the safety thereof. SOLUTION: A commercially available key duplicating tool can produce a mode of key setting by inserting a flat thin wire via a thin pipe inserted into a keyhole, into a gap between partition plates 3 of the lever tumbler lock and a lever tumbler 11, and detecting an angular position of an unlocking notch of the lever tumbler. Therefore to prevent the illegal unlocking, a shallow notch 19 is formed at least in one lever tumbler 11 at an angular position different from that of an unlocking notch 9 located at a free end outer edge, so that an outsider is led to a false recognition that the shallow notch 19 is the unlocking notch 9. COPYRIGHT: (C)2005,JPO&NCIPI
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