Method for reducing altitude of overall center of gravity when processing or ranking mobile crane with mounted arm, involves down obstructing arm and positioning of arm jib on transfer car

摘要

The method involves down obstructing arm and positioning of an arm jib on a transfer car and releasing a pivoted connection in break point of the split arm, where a lower arm part is down obstructed. An upper arm part is pivoted around a pivoted axis within the break point of the arm opposite to the lower arm part, where a crane is shifted to the destination. Independent claims are also included for the following: (1) a joint grid unit for a split arm; and (2) a mobile crane, particularly especially narrow gauge crawler crane.