Retractile Boom with Safety Structure for Truck Crane

摘要

When extending or shortening the length of the load to be acting largely ensured the safety of the parts, rotate the pillar frame possibly fixed boom is installed, is inserted into the fixed boom and a plurality of multi-stage multi-stage boom that is installed to be movable by sliding, the fixed boom and a hydraulic cylinder connected to the first stage of the multi-stage boom, and fixed by a hydraulic cylinder multi-stage boom extension means for extending the length of the clearance in accordance with the multi-stage boom slide from the inside of the boom, comprising: pull-up speed in accordance with a multi-stage boom means to the interior of the fixed boom via a hydraulic cylinder to reduce the length of the multi-stage boom and, one end of the securing means extending through one end of the first stage of multi-stage fixed to the fixed boom and the boom to the other end of the second stage, and one pair is made of a tank which is installed at a predetermined distance and the first extension rope, one end fixed to any one of the multi-stage boom and then through one end of the end portion of the other end fixed to the next stage at a predetermined interval, and one pair is made of a tank which is installed and a plurality of sets of second extension cords, and provides a new high-place work having a boom structure Vehicle Safety comprises at least one first safety rope to the first auxiliary rope extension.