Patent ID: 8757580

Claim:
A height-adjustable pedestal comprising: a guiding device having a substantially vertical orientation, said guiding device includes a vertical guide rail, a height-adjustable foot platform having at least one slide carriage movable vertically along the guiding device, and a support member having a rear side, a front side spaced from the rear side, and a flat plate extending between the rear side and the front side, and the flat plate having a free end opposite the rear side, the support member mounted along the rear side to the slide carriage where the support member is on a side of the slide carriage different from the guiding device and the support member extending away from the slide carriage in the direction of the front side, a spring device that provides a spring force according to a corresponding spring characteristic, the spring device including a helical spring orientated vertically parallel and adjacent to a side of said vertical guide rail, and a lever mechanism that is interconnected between the spring device and the platform such that the spring force is transferred by the lever mechanism to the platform in a manner so as to provide a lifting force that counteracts the weight force of the platform in order to facilitate the height-adjustment of the platform where the lifting force is greater than the weight force by a substantially constant amount, wherein the lever mechanism is configured such that it at least partially compensates for a variation of the spring force that occurs according to the spring characteristic; a vertical retaining plate connected to the guiding device such that the vertical retaining plate is between the guiding device and the spring device; a second spring device; and a second lever mechanism, and wherein the guiding device includes a second vertical guide rail, each rail having a guiding channel in sliding engagement of the at least one slide carriage, the lever mechanism and the second lever mechanism each includes a rotation shaft, a cam disc defining a leverage ratio between the spring force and the weight force, the cam disc is connected to the rotation shaft, and a cable that is guided around the cam disc such that the spring force is transferred to the platform by the cable, and each of the spring device and the second spring device is parallel to the rails and vertically extend around and along a substantial length of one of the rotation shafts.