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

Claim 0:
1. A self-hoisting crane adapted to be mounted on a nacelle of a wind turbine, wherein 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, the self-hoisting crane further including a crane base adapted to be arranged on the nacelle, wherein a free mounting end of the pedestal is adapted to be mounted in a mounting position on the crane base, wherein the self-hoisting crane is adapted to be hoisted from the ground to the nacelle by operating a cable winch arranged at the ground, wherein the at least one cable is adapted to extend 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, wherein the self-hoisting crane is adapted to be 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, wherein the intermediate first and second hinge parts are adapted to be connected together in order to pivot the self-hoisting crane about a hinge axis of the intermediate first and second hinge parts, and wherein the pedestal is adapted to be mounted on the crane base with the boom arm of the self-hoisting crane arranged above the pedestal for normal operation, wherein the at least one roller is arranged in a hoist block, in that the crane base includes a jib adapted to, during lifting of the self-hoisting crane to the nacelle, carry the hoist block 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 the vertical distance from the intermediate second hinge part of the crane base to the first hoist block position is longer than the distance from the intermediate first hinge part of the self-hoisting crane to the free mounting end of the pedestal, and in that the hoist block is releasably attached to the jib in order to be removed from its first hoist block position and thereby allow passage of the self-hoisting crane through the first hoist block position when pivoting the self-hoisting crane about the hinge axis of the intermediate first and second hinge parts.