Patent ID: 8128053

Claim:
A vertically adjustable item of furniture comprising: a supporting base; a vertical pipe having a first end arranged at the supporting base; a guide bush fastened to a second end of the vertical pipe opposite the supporting base; a cylinder coaxially arranged in the vertical pipe, the cylinder being filled with a compressed gas, wherein the cylinder is displaceably guided in the vertical pipe and projects out of the vertical pipe; a piston arranged in a guide pipe, the piston dividing the cylinder into a first work chamber and a second work chamber; a piston rod fastened at a first end to the piston, the piston rod configured to extend through the second work chamber and is sealingly guided outward by a sealing and guiding device, a second end of the piston rod arranged with its second end at the first end of the vertical pipe; an electromagnetically controllable valve arranged in a valve chamber and configured to block a connection between the first work chamber and the second work chamber, the valve configured to be actuated by an actuating device; an object to which force can be applied arranged at the end of the cylinder projecting out of the vertical pipe; and at least one of a sensor and a switch configured to generate a signal that causes the electromagnetically controllable valve to close when the piston reaches a predetermined position in the cylinder.