Patent ID: 7171890
Filing Date: 2007-02-06
Classification: A61G,B66F,F15B

Abstract:
1. Telescopic lifting column, comprising: a plurality of tube bodies which are arranged concentrically inside one another and are axially movable in each case with respect to each other, a hydraulic actuator unit which is arranged in the tube bodies so as to be operating in the axial direction, comprising a first hydraulic cylinder-piston unit and a second hydraulic cylinder-piston unit connected with the first, the first cylinder-piston unit being connected to a first end of the telescopic lifting column and the second cylinder-piston unit being connected to a second end of the telescopic lifting column, in which the first cylinder-piston unit has a variable operating chamber and the second cylinder-piston unit has a variable operating chamber, said operating chambers being interconnected, characterized in that the first cylinder-piston unit is of the type having a first variable operating chamber and a second variable operating chamber, and the second cylinder-piston unit is of the type having a single variable operating chamber which is in communication with the second operating chamber of the first cylinder-piston unit.