| 摘要 |
PROBLEM TO BE SOLVED: To provide an alarm device which detects an abnormal condition without entailing any malfunction and sounds a warning buzzer, aside from being inexpensive plus certainty, in a canopy covering an operating surface by an internal roof at the roof lower end position. SOLUTION: This alarm device is equipped with a key locking switch 3 performing either signal output of a high or low signal in response to ON/OFF control over a key, an internal roof detecting sensor 4 detecting a setup state of an internal roof at the roof lower end position, an internal secondary battery 6 receiving the feeding of power and accumulating DC power, a burnout detecting means 12 catching a signal to be generated when a signal wire is snapped, and a buzzer 7 receiving a state of signal output and outputting a buzzer sound by battery power, and in this constitution, a setup state of the internal roof is detected in a state of being key-locked at the roof lower end position. |
