Patent ID: 7341158

Claim:
A traveling crane comprising: a base machine having a boom derrickably attached thereto at one end of the boom and a jib derrickably attached to the other end of the boom; a jib derricking device for raising and lowering the jib; and a hook hoisting device for hanging up and down a lifting hook from an end of the jib, the jib derricking device comprising: a jib derricking winch mounted on the base machine; a jib derricking rope wound/rewound by the jib derricking winch; lower and upper spreaders around which the jib derricking rope is routed for raising and lowering the jib; a strut attached to the top of the boom rotatably about a horizontal axis in a fore-and-aft direction; a jib guyline connecting the strut to the jib; and a strut guyline connecting the strut to the upper spreader, the hook hoisting device comprising: a hook hoisting winch mounted on the base machine; a hook hoisting rope wound/rewound by the hook hoisting winch; and a hook hoisting guide sheave for guiding the hook hoisting rope from the top of the boom toward the end of the jib, wherein the hook hoisting guide sheave is arranged on the top of the boom in a state that the guide sheave can guide the hook hoisting rope along the upper surface of the boom by folding back the rope toward the upper spreader placed at a position adjacent to a boom anchor during assembling/disassembling of the traveling crane, further comprising spreader guiding means for guiding the upper spreader along the upper surface of the boom from the boom anchor toward a far end of the boom.