| 摘要 |
PROBLEM TO BE SOLVED: To provide a crane alarm device having less noise pollution, easily applicable to various kinds of hooks, and highly versatile. SOLUTION: An alarm system comprises a portable alarm 10 which can be attachably/detachably hanged from a hook 3 of a crane via a wire 11, and a portable radio transmitter 20 to be held by a slinging responsible person 7 and manually operated. In the alarm 10, an electronic buzzer 12, a radio receiver 13, a dry battery type power supply 14, and a manual power supply switch 17 are stored in a casing of a compact container. When the slinging responsible person 7 determines that an alarm is required, the radio transmitter 20 is operated to transmit the ON-signal. The ON-signal is received by the radio receiver 13, and the electronic buzzer 12 is operated, and an alarm sound is generated. COPYRIGHT: (C)2007,JPO&INPIT
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