The device (1) has a leg support (2), which is divided into an upper plate (4) and a lower plate (4'). A further plate is provided on the lower plate, which is connected by a lead to a connector member. A clamp is provided on this further plate, which is fastened to an electric motor. An actuator connector is provided on the drive axle of the electric motor, which is connected to an intermediate connector. Rails (12,12') are provided on both sides of the upper plate, to which rollers of a runner (13) can be attached. The runner moves vertically and horizontally from the upper plate. The end of the intermediate connector passes through a long hole (15,15') in the rails, so that it is secured onto the lower part of the runner. A waist support device (3) is formed as a single plate. Roller clips (17,17') on both sides of the plate are proved with rollers of the runner. A long hole (18) is provided in the middle of the roller clips so that engages and secures a lower middle guide of the runner. A support bearing is removably attached to the runners of each support device.
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