| 摘要 |
PROBLEM TO BE SOLVED: To provide a mobile crane device fitted with aux. jib capable of performing the aux. jib mounting and removing operations simply, with effectiveness in workability and using a finite working space. SOLUTION: An expansion boom 3 is inclined downward from the base end 3a to the forefront in the longitudinal direction of a vehicle 1 in the accommodated condition in such an arrangement that the forefront 3b is positioned lower than the oversurface of the frame 1a of vehicle 1, and thereby the ground clearance of this part is suppressed, and it is practicable for an operator on the ground to easily perform the inserting and removing operations of a rotary fulcrum pin 25, etc., when the aux. jib 10 is to be mounted and accommodated at the forefront 3b of the boom 3, to lead to enhancement of the workability effectiveness and safety in works or an enhancement of the reliability. The aux. jib 10 is arranged to be mounted at the boom forefront 3b on the over- mount system, which allows conducting the mounting and accommodating operations of the aux. jib 10 easily in a minor working space.
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