| 摘要 |
PROBLEM TO BE SOLVED: To provide a mobile crane X equipped with a pair of masts 20 arranged at a jib 14 being inclined to the left and right about the boom rising and falling surface Y, a pair of first tension members 21 to couple the tips of the masts 20 with the tip 18 of the jib, and a pair of second tension members 22 to couple the tips of the masts 20 with an upper revolving body 12, wherein the constitution is arranged able to suppress the spread of the masts 20 at the time of jib working effectively without bringing about a large-scale arrangement nor involving a weight increase. SOLUTION: An inter-mast coupling member 24 is installed to couple the masts 20 with each other, whereby the external force willing to widen the space between the masts 20 can be absorbed efficiently by this inter-mast coupling member. This enables the construction of the whole device to be simple and lightweight because there is no risk that the arrangement becomes large scaled nor the strength of the masts themselves must be heightened. COPYRIGHT: (C)2007,JPO&INPIT
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