| 摘要 |
PROBLEM TO BE SOLVED: To provide a bridle feeding device capable of moving a bridle easily toward an insert boom by only operation of a retraction means of an auxiliary crane or the like and a derricking drum on the crane main body side besides initial manual setting work in assembling a crane in a tower style requiring the bridle to be moved from the bottom side toward the insert boom because of difference in length of a pendant rope and boom length for installation on a boom tip which has conventionally required a lot of manual work. SOLUTION: A sheave is installed on the boom or a tower bail on the boom, a rope from the retraction means of the auxiliary crane or the like is inserted to the sheave, and the bridle moving toward the other end of the rope is connected. The rope is pulled by the retraction means of the auxiliary crane or the like, whereby the bridle is set movable from the position of a bottom boom to the position of the insert boom. COPYRIGHT: (C)2004,JPO
|
