Variable length boom with locking system and method for operating a variable length boom of a crane

摘要

A variable length lattice-type crane boom for a crane comprising a lattice-type base boom section and at least one lattice-type telescopic boom section, wherein at least one telescopic boom section is a telescopic boom section Is adjustable relative to the base boom section between a retracted position where the boom is approximately inside the base boom section and an extended position where the telescopic boom section is approximately outside the base boom section, and the boom is at least extended A locking system configured to lock at least one telescopic boom section in position relative to the base boom section, the locking system having a plurality of pins, each pin being in at least an extended position of the boom , Base boom sexi It is configured to extend through emission and at least one corresponding pin receiving opening formed in one of the telescoping boom sections.