| 摘要 |
PROBLEM TO BE SOLVED: To provide a locked state detector and locked state confirmation method for enabling a patrol security guard or the like to easily and surely detect and confirm a locked state in a facility having many windows and doors without requiring high cost.SOLUTION: A locked state detector includes: a mercury switch 10 that is mounted on a knob 62 of a crescent lock body 60 so as to rotate with the knob 62, becomes in an ON state when the knob 62 is at an unlocked position, and becomes in an OFF state when the knob 62 is in a locked position; a magnetic proximity switch 20 that is connected in series with the mercury switch 10 and becomes in an ON state when being affected by magnetism; and a signal generation unit 40 for generating a locked state detection signal during a period in which the magnetic proximity switch 20 is in an ON state and the mercury switch 10 is in an ON state. |
