Patent ID: 6990873

Claim:
An electric motor drive comprising: a first transmission stage comprising drive pinion engaging a gearwheel, the first transmission stage further comprising a worm firmly connected to an output drive shaft of the gearwheel such that a worm gear can be driven; a second transmission stage comprising the worm and the worm gear, wherein the shaft of the worm gear forms an output drive shaft of the electric motor drive such that the output drive shaft of the electric motor drive may he rotatably driven between an initial position and a final position; wherein the output drive shaft of the gearwheel can be driven when no current is flowing through the electric motor such that the output drive shaft may be rotated by a restoring spring in the rotation direction to the initial position, and the second transmission stage is a non self-locking transmission stage, and wherein the restoring spring is a drive spring arranged in a spring housing with an opening stress.