| 摘要 |
PURPOSE:To secure prevention of burglar by providing a picking preventing switch turned ON with key insertion into a key hole and turned OFF with key removal for operating a security device even if a reset switch is operated by a rotor of the lock while the switch is OFF. CONSTITUTION:A picking preventing switch (referred to as switch hereafter) 17 is provided in the deep of a lock 3 wherein a casing 18 of the switch 17 is fixed on a fixing member 14 while a slider 19 is provided on the casing 18. When a key 9 is inserted into a key hole, a shaft 20 of the slider 19 pushes to the right against a spring 21 to have the switch 17 turned ON. When the key 9 id drawn out, the slider 19 is pushed by the spring 21 to slide leftward to have the switch 17 turned OFF. Even if a rotor 7 of the lock 3 is turned toward a lock releasing direction B and a reset switch 11 is operated, a security device operates since the switch 17 is connected to the security device. When the key 9 is used to operate the reset switch 11, the security device does not operate since the switch 17 is ON. |
