Adjustment device for vehicle seats

The invention relates to an adjustment device (2) for vehicles (1), in particular electric wheelchairs or rehabilitation vehicles, reclining systems and care beds, comprising at least one mounting plate (3) and a bearing plate (4) with a lifting device (5) which comprises at least two scissor fixtures (20) which are arranged at the lateral longitudinal edge or in each case in a corner region of the mounting plate (3) or bearing plate (4) and are adjustable in height via a drive means, wherein each scissor fixture (20), designed as a double scissor arrangement, has a first, lower scissor element (21) and a second, upper scissor element (22) which are connected at one end via a common rotation axis, and the lower scissor element (21) is connected at the other end to the mounting plate (3) and the upper scissor element (22) is connected at the other end to the bearing plate (4) via fastening means. In order to permit diagonal tilting of the adjustment device, provision is made according to the invention that the at least one fastening means consists of a console (35) connected to the bearing plate (4) and of a fastening unit (30) which is axially movable with respect to the console (35) and on which the ends of the upper scissor elements (22) of at least one scissor fixture (20) are articulated. With the aid of the console (35) and fastening unit (30), an axial mobility in the longitudinal direction of the vehicle seat (13) is permitted, such that no jamming can occur even in extreme positions of the scissor fixtures (20).