| 摘要 |
PCT No. PCT/SE85/00110 Sec. 371 Date Nov. 18, 1985 Sec. 102(e) Date Nov. 18, 1985 PCT Filed Mar. 12, 1985 PCT Pub. No. WO85/04083 PCT Pub. Date Sep. 26, 1985.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. |
