segments 9 10 11 and on the other hand also makes possible tilting movements about a rotatory bearing axis c parallel to the other bearing axes a b the retaining lug 36 prevents the bracket 15 from detaching the bearing 25 is located above and in the direction of the rod between the pivot bearings 26 27 as fig3 illustrates the horizontal leg of the stiffening rib 23 located under the bracket part 22 ends with a distance x in front of the retaining lug 36 and in front of the bracket suspension 24 the leg length and the distance x to the bracket suspension 24 are adapted to the tensioning means 17 in case of a failure of the spring s 33 in particular of the set or sets of disk springs a maximum path of displacement along the translatory axis d in the outward direction is defined by the distance x and is adhered to relative to the bracket suspension 24 the said distance or path of displacement x may be variable and adjustable in order to take the thermal requirements and the respective structural conditions into account the variability can be achieved by adjusting screws or other adjusting means which are mounted on the bracket suspension 24 or on the bearing 25 a safety limiting means 41 for the bracket 15 and for degrees of freedom of its mount 16 is formed by the bearing 25 the retaining lugs 36 and the rib distance further the tensioning unit 45 has a spring 33 associated.