Patent ID: 6908074

Claim:
A device for changing rigging of pulley blocks of a crane, comprising: a jib tip of a jib of a crane configured to allow rigging of a pulley block with respect to a lifting cable to be changed at least between a first rigging arrangement with one strand of cable, and a second rigging arrangement with two strands of cable, the jib tip comprising: a single pulley mounted on a horizontal axle oriented transversely to the jib, the pulley being moveable along the axle between a first position substantially in the vertical midplane of the jib to accommodate the first rigging arrangement and a second position, offset transversely alone the axle from the vertical midplane of the jib, to accommodate the second rigging arrangement, and an attachment point for attaching an end of a lifting cable to the jib tip in the second rigging arrangement, the attachment point situated on the jib tip on an opposite side of the vertical midplane of the jib with respect to the second position of the pulley; and a lifting block, comprising: a housing which houses a pulley on a horizontal axis to accommodate the second rigging arrangement, and an attachment point for attaching the end of the lifting cable to the lifting block, and a guide for guiding the lifting cable toward the center of the upper part of the housing of the block to accommodate the first rigging arrangement.