| 摘要 |
PROBLEM TO BE SOLVED: To provide a lock breakage prevention device which generates a warning sound (light) when a lock breakage sensor constituted by being adhered to a door or a door frame is broken down with a bar and a driver, etc. SOLUTION: A lock breakage prevention device constituted by adhering a thin lock breakage sensor to the outside of the door where a key box is placed and to the outside of the door frame, connecting a lock breakage sensor adhered to the outside of the door to an alarm installed at an upper inner part of the door by wiring and connecting the lock breakage sensor adhered to the outside of the door frame to an alarm installed at an upper part of an outer wall part of the frame by wiring is provided. When the lock breakage sensors are broken down by the bar and the driver, etc., a lock breakage sensor detection circuit is activated and a warning sound (light) is generated. COPYRIGHT: (C)2004,JPO
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