An electric motor drive unit for adjusting supporting parts, articulatedly mounted relative to one another, of a support device to support a box spring mattress or an upholstered bed relative to each other. It includes a base, on which two drive units are arranged. Each drive unit includes an output member, and each interacts with a pivot lever in the installation position of the dual drive. The dual drive is disposed in an operative connection with an adjustable supporting part to pivot the same. The pivot levers are attached articulatedly mounted to the base such that the base together with the pivot levers form a unit attachable to a support device.
