Patent ID: 7341157

Claim:
A crane comprising: a boom comprising an elongate tubular structure having two ends defining a longitudinal direction and an interior space; a line assembly formed as a self-supporting, modular unit inserted in the longitudinal direction into the boom; and the line assembly extending a line from a depending lifting sheave at one end of the boom and comprising: a first bank of sheaves, comprising a base with a height and width corresponding to a lateral cross-section of the internal space; a second bank of sheaves comprising a housing with at least one slide pad; the line reeved around the first and second banks of sheaves; a first hydraulic cylinder controlling the distance between the first and second banks of sheaves; and the second bank of sheaves and at least a portion of the first hydraulic cylinder being enclosed within the elongate tubular structure, the base being inextensibly fixed in the longitudinal direction with respect to the boom.