Counterbalanced crane structure

摘要

A windlock for selectively preventing relative pivotal movement between a mobile platform and a horizontal interconnecting stinger at the base of an elevated crane. The stinger is normally interconnected to one load platform for relative pivotal movement about the stinger central axis. Outer horizontal surfaces on the stinger structure are longitudinally movable relative to the platform to a position between adjustable screws which engage them to lock the stinger against rotational movement. This locking arrangement applies the heavy weight of a remote counterweight unit to assist in preventing lateral tipping of the load platform on which the elevated boom is supported. Outboard jacks on the platform further stabilize it against lateral tipping movements.