Abstract: A switchboard desk is equipped with a height-adjustable desk-top and at least two telescopic legs. The desk comprises devices which effect the raising and lowering of the top, and control devices. The height-adjustable devices comprise at least two hydraulic cylinders each positioned in a telescopic leg and connected to a hydraulic pump, which in turn is driven by an electric motor. The controlling devices comprise manually actuated devices which switch on the electric motor to rotate in either direction according to the way they are actuated. A potentiometer monitors the rotation of the electric motor and controls a digital voltmeter for providing the indication of the position of the desk-top above a reference level.

Abstract: An adjustable switchboard desk has a top which can be raised and lowered by at least two telescopic legs. In each telescopic leg a hydraulic cylinder and its associated piston are arranged. The cylinder is fixed to the desk-top and the piston is fixed to an outer part of the telescopic leg, or vice versa. The inner and outer parts of the respective telescopic legs are made of closed profile with longitudinally extending, mutually co-acting guide surfaces.