| 摘要 |
PROBLEM TO BE SOLVED: To provide an adaptor for mounting a jib that can reduce manufacturing costs and improve a work efficiency and safety.SOLUTION: A sheave supporting member 130 can be switched between an expanding posture and a storing posture by being turned in a horizontal direction with an adaptor main body 110 temporarily placed on a horizontal plane. An adaptor 100 for mounting a jib comprises: the adaptor main body 110 which covers vertically a tip surface and a side face at a tip side of a boom head 11; a sheave 120 for attaching/detaching a jib for guiding a wire rope from which a jib 20 is hung down during work for attaching/detaching the jib 20; and the sheave supporting member 130 for supporting rotatably the sheave 120 for attaching/detaching a jib.SELECTED DRAWING: Figure 4 |
