Patent ID: 7290671

Claim:
A crane comprising: a lower traveling body; an upper rotating body mounted on the lower traveling body in such a manner that the upper rotating body can rotate around a rotating axis; a boom unit provided on the upper rotating body and including a lower boom having a lower end pivoted to the upper rotating body and continuously tapering outward from said lower end of the lower boom to an upper end of the lower boom; a hoisting device provided on the upper rotating body, the hoisting device lifting and lowering a hanging hook that hangs from the boom unit; and a sheave device for self-assembling/disassembling provided on an upper section of the lower boom, a hoisting rope from the hoisting device extending through the sheave device, the sheave device comprising: a first sheave provided on a rear side of the lower boom and being rotatable around a horizontal axis extending in a left-right direction; second and third sheaves provided next to each other in the left-right direction on a front side of the lower boom and being rotatable around a horizontal axis extending in the left-right direction; and a rope-end anchor provided adjacent the rear side of the upper end of the lower boom at a position above the first sheave, the rope-end anchor securing a rope end of the hoisting rope extending, from the hoisting device, through the first sheave, the second sheave, a hook sheave of the hanging hook, and the third sheave, in that order.