52 60 68 is also suitable for the exemplary embodiment shown in fig2 fig4 shows an additional exemplary embodiment corresponding essentially to the exemplary embodiment shown in fig1 however pressure compensation device 94 is additionally provided pressure compensation device 94 has a line 96 that extends between hydraulic accumulator 48 and hydraulic cylinder 26 and includes a check valve 98 that closes in the direction of hydraulic cylinder 26 in addition a line 99 is provided that extends between hydraulic accumulator 48 and an on off valve 100 connected to hydraulic tank 20 and that is provided with a pressure scale 102 pressure scale 102 is controlled via pressure lines 104 106 on the one hand by the pressure acting in line 96 and is controlled on the other hand by the pressure acting in line 99 depending on the ratio of these two pressures pressure scale 102 switches into a closed position or into an open position to on off valve 100 on off valve 100 has a closed position oriented in the direction towards hydraulic tank 20 and an open position in comparison with the exemplary embodiments shown in fig1 to 3 here a sensor 82 for determining the position of hydraulic cylinder 26 can be omitted hydraulic accumulator 48 is here always.