Blade gripping device with rectangular carrying structure

A method of operating a blade gripping device for gripping a rotor blade of a wind turbine, relative to the rotor blade, whereby the device comprises

• a first frame which is essentially horizontally aligned in a designated operating position and
• a second frame which is essentially horizontally aligned in the designated operating position and
• a blade gripping assembly with a number of blade gripping tools,
• whereby
• the first frame and the second frame are connected to each other via a swivel or other similar type connection the connection realized to permit a yawing movement of the second frame relative to the first frame,
• the first frame comprises a rectangular carrying structure with at least four connectors for connection to a lifting device, which connectors are positioned essentially at the corners of the rectangular structure, and whereby
• the second frame is yawed in such way that an axis of the device is aligned with a longitudinal axis of the rotor blade in such way that the gripping tools can grip the rotor blade in a designated gripping position.