case at the end of the drive distance here 3 u00d7 distance d a drive unit with an adjustment lever upwards 6 and operating in each case under tension the pivot units located therebetween with pivot lever upwards 7 are also actuated by traction means 8 pivot angles sw are generally u00b1 45 u00b0 if the drive is pulled in one direction the pulled drive is held with a residual force against the pulling drive as a result of which the system of traction means 8 is reliably kept tensioned up until standstill both outer sitting drives build up a minimum tension force in order to fix the system the number of pivot units between the drives here only 2 can of course be much higher if the lateral drives are activated hydraulically the connection and actuation of both sides can proceed either via a hydraulic line a more expedient variant provides an actuation of both sides via an electric control unit so that these two sides are only connected by cable a radio control unit would also be possible a tensioned system has the advantage above all in the event of a storm that vibrations do not build up so easily fig5 shows a drive station 6 mounted on a ground anchor 4 it is possible to see pivot lever 11 which rotates about pivot axle s or forms pivot axle s between the bearing points pivot lever 11 is moved by dual acting hydraulic cylinder 10 outbound traction element 8 is also apparent here it is furthermore shown how carrying elements 9 here a square tube at articulated joint regions gl which also form the bearing are connected the hydraulic cylinder could also be replaced by a spindle motor the.