| 摘要 |
PROBLEM TO BE SOLVED: To allow fixing for a hook even in a boom-erected condition, to secure a visual field in sides in the boom-erected condition, and to make a crane travel without generating swing of the hook. SOLUTION: A rear sloped face 8 for fixing a hook 2 sloped with respect to a lower face 4 is provided to be brought into contact with an upper face 5 of the hook 2 when the hook 2 is hoisted in a boom 6-erected condition, in a rear part of the lower face 4 of a boom top 3, in a crane wherein the hook 2 is suspended from the boom top 3 by a wire rope 12, and which is provided, in the boom top 3, with the lower face 4 for fixing the hook 2 brought into contact with the upper face 5 of the boom 6 when the hook 2 is hoisted in a boom 6-turned-down condition.
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