| 摘要 |
PROBLEM TO BE SOLVED: To provide a crane wireless operation device capable of preventing the wasting of a battery of a wireless operation device and of smoothly operating it to a safer side. SOLUTION: In this wireless operation device for a crane, which is constituted so as to notify an operator of the risk state of the crane by vibrating a vibration generation means of the wireless operation device based on a risk state signal from a safety device of the crane, the wireless operation device is vibrated only when the crane is operated in the risk direction by the wireless operation device even if the risk state signal is input in the wireless operation device. COPYRIGHT: (C)2008,JPO&INPIT
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