a wall frame; and

an application frame, wherein the application frame is movable with respect to the wall frame;

a first spring system and a second spring system, which two spring systems are each coupled with the wall frame and the application frame to apply forces on the application frame,

wherein the first spring system has its opposite ends connected to the wall frame and the application frame respectively, and the second spring system is at a first end connected to the wall frame and the second spring system is at a second end distant from the first end connected to an adjusting device which is coupled with the application frame, the adjusting device being arranged to vary an extension of the second spring system when the application frame moves with respect to the wall frame,

wherein the second spring system and the adjusting device are facing each other at a single side of each other only and without the second spring system facing the adjusting device at any other side than the single side so as to provide an asymmetric placement of the springs and the adjusting device within the apparatus, wherein the asymmetrical placement is along an axis that is parallel to the second spring system, said axis having along its length a constant distance with reference to the second spring system, and that the adjusting device comprises a single trajectory profile element, and only and no more than a first arm and a second arm that are connected to each other at a first hinge,

wherein an end of the first arm distant from the first hinge is with a second hinge connected to the application frame, and an end of the second arm distant from the first hinge is with a third hinge connected to the second spring system, and that the first hinge that joins the first arm and the second arm is movably connected to and guided by the single trajectory profile element.