Offshore drilling rig jib crane - has increased elasticity to reduce shock-loads on hoist rope

摘要

The crane is partic. for use on an offshore drilling rig, having a base structure on which the jib and derricking mechanism are mounted. The mechanism comprises a frame containing a winch derricking the jib in and out. Shock-loads on the hoist rope are reduced by increased elasticity of the crane structure. This can be done using rams forming some of the frame members.