| 摘要 |
PURPOSE:To prevent a burglary by providing an alarm equipped with a switch, a vibration sensor, a timer, etc., to a gate bar lock as a unit, and sounding an alarm after the elapse of a certain time in the case unlocking vibration is acted after the locking. CONSTITUTION:An alarm 18 equipped with a switch 50 interlocking with a locking and unlocking lock, a vibration detection sensor, a timer, an electronic buzzer, etc., is provided to a shackle lock 16 equipped with gate bars 12 and 14 as a unit. After the locking, in the case unlocking action (vibration) is acted on the lock 16, and after the elapse of a certain time (for example, ten seconds), an alarm is sounded. In the case the person concerned makes unlocking control by means of a specific key, when the gate bars 12 and 14 are removed within ten seconds, the alarm is not sounded. According to the constitution, a burglary can be prevented.
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