Patent ID: 7404475

Claim:
A bidirectional drive for rotating a drive wheel connected to an adjusting device into one or other drive direction with a drive lever that swivels about a drive axis starting from a neutral position into one or other direction and which is connected to a coupling element for expanding a spring element which is supported at least in part on a cylindrical drive face of the drive wheel and entrains the drive wheel in a circumferential direction by forming a contact bearing against the cylindrical drive face when the drive lever is moved away from the neutral position whilst with a return of the drive lever into the neutral position the contact bearing of the spring element against the cylindrical drive face of the drive wheel is lifted and the drive wheel is not entrained, wherein the coupling element includes expansion cams which are mounted at different radial distances from the drive axis and which are able to tilt about an axis spaced from the drive axis and which expand actuation levers connected to the spring element so that the spring element bearing against the cylindrical drive face of the drive wheel is widened out.