OFFSETTING LINK ASSEMBLY FOR FOLDING LUFFING JIB

摘要

A crane boom and luffing jib assembly have an offsetting link to allow the luffing jib to fold back and under the main boom for assembly of the boom and luffing jib assembly on a construction site where the entire length of the boom and luffing jib cannot be laid out during assembly. A method of assembling the crane boom and luffing jib comprises the steps of assembling the luffing jib and boom, the luffing jib pivotally attached to the jib connection pivot, the luffing jib folded back and under the boom along a ground surface, the hinged connection allowing neutral axis of the jib boom section to be offset relative to the boom connection pivot; attaching the boom to a crane; raising the boom top upwardly, allowing the jib top to travel along the ground surface until the luffing jib is lifted off the ground surface; causing the jib boom section to be aligned with the jib connection pivot; and inserting hinge pins into the hinged connection to lock the jib boom section in axial alignment with the jib connection pivot, wherein the luffing jib is initially folded back and under the crane boom.