Crane and lift enhancing beam attachment with moveable...

B - Operations – Transporting – 66 – C

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214/23, 212/41.1

B66C 23/72 (2006.01) B66C 23/76 (2006.01)

Patent

CA 1316148

ABSTRACT OF THE DISCLOSURE A crane and an attachment comprising a counterweight support beam including a plurality of connected seg- ments movable relative to each other, and having a fore end adapted to be connected to the crane upper works, and an aft end rearward from the rear portion of the upper works. The attachment also includes a moveable counterweight carrier adapted to carry a counterweight when the counterweight is supported thereon. The car- rier is mounted on the support beam for movement along the length thereof. The attachment also includes a cylinder for selectively moving the counterweight car- rier fore and aft along the beam, landing gear for nor- mally supporting the aft end of the beam on the ground, and a backhitch pendant and a pendant cylinder inter- connecting the aft end of the beam and the top of the mast for raising the landing gear from the ground in- cident to lifting a heavy load from the boom. The sup- port beam is extendable by moving the connected seg- ments relative to each other between a first position, wherein the aft end is spaced from the rear portion of the crane upper works, and a second position, wherein the aft end is spaced further from the rear portion of the crane upper works.

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