to the special shape of the horizontal chain links 10 a two dimensional or rolling line support of the vertical chain links 17 is provided furthermore these horizontal chain links 10 have correspondingly formed chain link curves 11 with herringbone tooth areas 12 so that the result is a favorable support especially in chain wheel 57 the chain link legs 13 have the shape of a kind of groove 14 which provides them with good support in carriers 3 ends 15 of these chain link legs 13 are shaped to where the result is a favorable support in the chain wheel fig6 shows a side view of two channel sections 2 43 which meet it is obvious that the joint area 44 34 bends 34 so that the result is overlap tongues 23 and 24 which have been mentioned numerous times this area is secured by a toggle connection and kept flexible it consists of toggle 39 which is inserted in pocket 38 toggle 39 is dog bone shaped at its end i e has heads 48 49 and a shaft 50 which connects the two in the center of the shaft there are notches 51 52 which indicate a predetermined breaking point which always remains the same the cross section of toggle 39 has the shape of an equilateral trapezoid which is indicated in fig1 it is inserted in correspondingly shaped pockets 38 whereby square head bolts 53 54 are inserted into these pockets 38 before the toggle 39 is inserted collar nuts 55 which are flush with the channel outer width are screwed on the square head bolts which as shown in fig6 overlap the.