| 摘要 |
PROBLEM TO BE SOLVED: To provide a cylinder lock capable of detecting pickings besides preventing the illicit operation of a key, particularly the damage of pickings. SOLUTION: The position of a picking preventive pin a2 or a3 is confirmed during the rotation of an inner cylinder 100, and when illicit key operation is performed, the rotation of the inner cylinder 100 is stopped halfway. Since a sensor s1 or s2 can detect illicit unlocking as the position change of the picking preventive pin a2 or a3, the safety of the cylinder lock can be further improved in combination with various alarm systems.
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