| 摘要 |
PROBLEM TO BE SOLVED: To easily perform joint hanging by a hoist in a short time. SOLUTION: Each of a master hoist A and a slave hoist B has location detecting parts 11a, 11b determining the locations of hook blocks and control parts 13a, 13b outputting operating frequencies to inverter circuits 7a, 7b. The master hoist A further has also a distance detecting part 12a determining a vertical direction distance between both of the hook blocks from the locations of both the hook blocks determined by both the location detecting parts 11a, 11b. The control part 13a of the master hoist A outputs an operating frequency eliminating deviation to the inverter circuit 7a when a distance determined by the distance detecting part 12a is deviated from a preliminarily fixed distance.
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