Patent ID: 8701904

Claim:
A crane vessel comprising a hull and a revolving hoist crane, the hoist crane comprising: a vertical structure fixed to the hull, a jib, mounted to a jib connection member which is rotatable about the vertical structure, the jib connection member forming a substantially horizontal pivot axis so that the jib can be pivoted up and down, a topping device configured to pivot the jib up and down, the topping device comprising a jib winch and a jib hoisting cable engaging with the jib, a main hoisting device configured to raise and lower a load, the main hoisting device comprising: a main hoisting winch, an associated main hoisting cable, and a main hoisting tackle, the main hoisting tackle comprising: a main hoist upper block connected to the jib of the hoist crane, and a main hoist lower block, the main hoist lower block comprising sheaves, a main load attachment device, and a lowering weight, an auxiliary hoisting device configured to hoist a load, comprising an auxiliary hoisting winch, an associated auxiliary hoisting cable and an auxiliary load attachment device; and a jib rest mounted to the hull for supporting the jib when the crane is not in operation, wherein the main hoist lower block is assembled from a sheave block comprising the sheaves of the main hoist lower block and a load attachment assembly comprising the lowering weight and the main load attachment device, the crane vessel is provided with a load attachment assembly storage device for engaging the sheave block and for storage of the disassembled load attachment assembly, and in that the crane vessel is further provided with a displacement device capable of engaging and disengaging with the load attachment assembly while it is assembled to the sheave block and when the jib is supported by the jib rest, wherein the displacement device is capable of displacing the load attachment assembly to and from the load attachment assembly storage device and the sheave block, and wherein the load attachment assembly storage device is provided with horizontal displacement means for horizontal displacement of the load attachment assembly storage device and with positioning means to position the load attachment assembly storage device opposite at least the sheave block.