JIB MOUNTING AND DISMOUNTING DEVICE AND JIB MOUNTING AND DISMOUNTING METHOD FOR MOBILE CRANE

摘要

PROBLEM TO BE SOLVED: To provide a jib mounting and dismounting device and a jib mounting and dismounting method for a mobile crane which can improve a work efficiency.;SOLUTION: A connection member 54 to which rotation force of a power source is transmitted is connected to an operation portion 53a which is formed in a columnar shape to be rotatable centered on a center shaft and operates a jib engagement/disengagement mechanism 50, and the operation portion 53a is operated by rotation force of the power source. This allows the operation portion 53a to be reliably operated even when the jib engagement/disengagement mechanism 50 which engages/disengages a jib 40 to/from a tip of an extension boom 21 gets rusty and runs out of applied lubricant, which can improve a work efficiency of work for mounting/dismounting the jib 40.;SELECTED DRAWING: Figure 2;COPYRIGHT: (C)2017,JPO&INPIT