Patent ID: 7891946

Claim:
A rotor blade adjusting drive for adjusting the pitch angle of a rotor blade of a wind power plant, comprising a drive train ( 2 ) which at the output end is connectable with the rotor blade and/or a bearing member supporting the rotor blade, and a spring accumulator ( 7 ) connectable with the drive train ( 2 ), which includes a spring accumulator shaft ( 8 ), a spring accumulator housing ( 9 ), and a spring means ( 13 ) which can be tensioned by the rotating spring accumulator shaft ( 8 ) and spring accumulator housing ( 9 ) relative to each other, wherein the spring accumulator shaft ( 8 ) and/or the spring accumulator housing ( 9 ) can be uncoupled from the drive train ( 2 ) and is rotatable with respect to the same for biasing the spring accumulator ( 7 ), and a braking device ( 26 ) is provided for retarding and/or retaining the spring accumulator shaft ( 8 ) and/or the spring accumulator housing ( 9 ) against the spring bias in the uncoupled condition of the spring accumulator ( 7 ).