Patent ID: 11932520
Assignee: LIFTRA IP APS
Field: Handling (Mechanical engineering)
Classification: CPC B  F  Y | IPC B  F

Claim 7:
8. A method of mounting a self-hoisting crane on a nacelle of a wind turbine, whereby the self-hoisting crane includes a pedestal, a boom arm, a hook block and at least one cable adapted to lift or lower the hook block in relation to the boom arm for operation of the self-hoisting crane in its mounted position on the nacelle, whereby the pedestal is adapted to be mounted in a mounting position on a crane base arranged on the nacelle, whereby the self-hoisting crane is hoisted from the ground to the nacelle by operating a cable winch arranged at the ground, whereby, during hoisting of the self-hoisting crane, the at least one cable extends from the hook block, out through a central opening in the pedestal, around at least one roller arranged at the crane base and to the cable winch arranged at the ground, whereby the self-hoisting crane is lifted from the ground with the pedestal pointing upwards until an intermediate first hinge part of the self-hoisting crane is positioned at a corresponding intermediate second hinge part of the crane base, whereby the intermediate first and second hinge parts are connected together and the self-hoisting crane is pivoted about a hinge axis of the intermediate first and second hinge parts, and whereby the pedestal is mounted on the crane base with the boom arm of the self-hoisting crane arranged above the pedestal for normal operation, wherein, before lifting the self-hoisting crane from the ground to the nacelle, a hoist block including the at least one roller is arranged on a jib at a first hoist block position above the intermediate second hinge part of the crane base and extended in horizontal direction from the nacelle, in that, during lifting of the self-hoisting crane to the nacelle, when the self-hoisting crane arrives at the position whereby the intermediate first hinge part of the self-hoisting crane is positioned at the corresponding intermediate second hinge part of the crane base, the cable extends in a downward direction directly from the at least one roller of the hoist block and through the central opening in the pedestal and therefrom to the hook block, and in that, after mutual connection of the intermediate first and second hinge parts, the hoist block is removed from its first hoist block position on the jib.