Telescopic lifting device

Telescopic lifting column, comprising:

• three 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, wherein the hydraulic actuator unit is connected to the middle tube body and 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 first variable operating chamber connected to a connection port for a hydraulic assembly, and a second variable operating chamber, and the second cylinder-piston unit has a variable operating chamber, said second variable operating chamber of the first cylinder-piston unit being interconnected with said operating chamber of the second cylinder-piston unit, wherein said second variable operating chamber of the first cylinder-piston unit and said operating chamber of the second cylinder-piston unit form a closed entity with a constant volume.