Abstract: An apparatus comprising a wall frame and an application frame. The application frame is movable with respect to the wall frame. The apparatus includes 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. The first spring system has its opposite ends connected to the wall frame and the application frame respectively. 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 is arranged to vary an extension of the second spring system when the application frame moves with respect to the wall frame. The adjusting device includes a single trajectory profile element, and only a first arm and a second arm that are connected to each other at a first hinge.

Abstract: An apparatus for exerting a force on a load, comprising at least a first spring system and a second spring system, which two spring systems are coupled with the load and produce forces that are applied to the load, wherein an adjusting device is provided coupled with the load, which is equipped with at least one coupling with which the first spring system and/or the second spring system are/is coupled, and which adjusting device is designed for moving the coupling subject to an adjustment of the load, wherein the first spring system has a linear spring characteristic and is coupled with the load, and wherein the second spring system is coupled with the coupling at a side of the coupling removed from the load, and wherein the coupling is designed for adjusting the second spring system subject to a predetermined spring characteristic of the second spring system such that, at the side of the load, the combination of the coupling with the second spring system possesses a force path diagram having a linear charact