Patent ID: 7789252

Claim:
A service crane for a service level floor ( 114 ) of a wind turbine on top of a tower, comprising: a moveable main crane beam ( 128 ) having a track ( 154 ) for guidance of a trolley ( 156 ); a first frame ( 146 ) comprising a hinge ( 144 ) at a pivot point ( 148 ), wherein the crane beam ( 128 ) is connected to the hinge ( 144 ) and pivots in a substantially horizontal plane about the pivot point such that a first portion of the crane beam ( 128 ) extends beyond the pivot point ( 148 ) to a proximal end ( 142 ) of said crane beam and a second portion of the crane beam extends beyond the pivot point to a distal end ( 130 ) of said crane beam, wherein said proximate end ( 142 ) of the crane beam extends beyond the service level floor ( 114 ) enabling a movement of the trolley ( 156 ) beyond the wind turbine service level floor; and, a stationary beam ( 124 ) which is connected with said distal end ( 130 ) of the crane beam ( 128 ) such that said distal end of the crane beam ( 128 ) can laterally move along the stationary beam ( 124 ).