| 摘要 |
PROBLEM TO BE SOLVED: To obtain a detonation preventing device, making the reception of a detonating signal transmitted from a commanding device impossible to prevent the initiation of the detonation device when a worker is within the effective range 5 of the explosive charge of the detonation device even in a case when the detonating signal of the detonation device is transmitted from the commanding device by mistake. SOLUTION: The detonation preventing device is carried by the worker having the possibility of approaching the position of installation of the detonation device. When the worker throw a power supply in by operating a switch, a detonation preventing signal having the same frequency as that used in the detonation device is transmitted through an aerial to a distance range equal to or longer than that of effective range of explosive from the worker whereby the receiving of a detonating signal of the detonation device is interfered by an electromagnetic interference due to the transmission of detonation preventing signal and the detonation can be prevented.
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