| 摘要 |
PROBLEM TO BE SOLVED: To reduce a size of a crane for dismounting and to prevent the interference in revolving by mounting a hinge on the approximately central part of a jib of a jib crane and upwardly folding the jib. SOLUTION: A jib 8 is divided into a basic side 8b and a point side 8c on a folding part 8a as the boundary approximately at a center. The folding part 8a is formed by connecting an upper member of the jib 8 by a hinge 10, and connecting a lower member with a flange 11 by a bolt 12, and the jib 8 is upwardly folded. The flange 11 may be connected by a pin, which is put in and out. According to this construction, as the jib 8 is folded to be minimized, a light crane of small capacity for disjoining can be used, and further a disjoining period can be shortened. As the revolving radius can be reduced, an adjacent crane can be simultaneously revolved, and the countermeasure to a storm can be easily taken.
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