Patent ID: 8104631
Filing Date: 2012-01-31
Classification: B66C,F03D,F05B,Y02E

Abstract:
1. A portable crane assembly for servicing a wind turbine comprising: a first primary support member and a second primary support member being rotatably attached to one another and having a common axis, the first primary support member extending through a hatch in a nacelle casing of a nacelle of a wind turbine, and the first primary support member being stationary and configured to attach to an attachment plate, the attachment plate being configured to attach to the wind turbine component though the hatch, the second primary support being freely rotatable around the common axis and being capable of rotating 360 degrees with respect to the stationary first primary support member; a plurality of movable secondary support members being configured to attach to the first primary support member by a collar, wherein the plurality of movable secondary support members are configured to support and anchor the first and second primary support members, wherein the plurality of movable secondary support members are operable to attach to the wind turbine at an angle by a plurality of secondary support fasteners; a boom member being pivotably attached to an end of the second primary support member; a plurality of secondary boom supports being configured to attach to the boom member, the plurality of secondary boom supports adapted to support the boom member; a boom actuator attached to the second primary support member and the boom member, the boom actuator capable of pivoting the boom member at an angle with respect to the first and second primary support members; wherein the portable crane assembly is capable of being assembled through the hatch on the nacelle of the wind turbine; and wherein the portable crane assembly is disassemblable into components that can be manually carried to or from the nacelle of the wind turbine.