Patent ID: 7562851

Claim:
Body support having a spring arm on which a device is to be mounted, comprising: a parallelogram guide which is made up of two opposing legs disposed parallel to one another and pivotably attached to two likewise opposing connecting elements that connect the respective ends of the legs with one another on a line in the direction of weight, an energy storage mechanism, which is supported on two pivot points on the parallelogram guide, in order to compensate a load acting on the parallelogram guide, so that the device is movable through practically its entire range of movement with the force remaining constant, at least one of these pivot points being adjustable in relation to the parallelogram guide in a direction angled to the direction of weight such that both the distance between the energy storage mechanism's pivot points and also the angle between a longitudinal axis of the energy storage mechanism and the direction of the load acting on the parallelogram guide change, whereby both the energy storage mechanism's pretension and also its action of force direction change; and a positioning element which supports the adjustable pivot point on the parallelogram guide, the positioning element being operable by only one actuating element.