DE721521C - End loop of double-wire contact lines, especially for trackless railways - Google Patents

Description

End loop of double-wire contact lines, especially for trackless Railways The tensioning of end loops prepares especially for contact lines for unlucky tracks considerable difficulties and high costs because of the two Multi-pole contact wires large curves, angle and guy cables occur, The Masts and their foundations as well as the guy parts must be dimensioned for this load which of course increases the acquisition costs significantly.

In the case of contact lines for railways, it is known to use short pieces of contact wire to clamp approximately parallel to continuous contact wires and the line to these Fork places in order to reach the passability of diversions and crossings. The purpose of this measure is, for this short contact wire absr-hm, 'tt, e special Abf.maste to save, whereby the reduced tension in the forked contact wires was accepted as inevitable. It is also known to use catenary curves to relieve the fact that one pulls the straight connecting lines of the contact wire by means of special ones running in the direction of the contact wire of the two connecting lines Catches guy ropes.

The invention relates to a special design of double-wire end loops, such as those used in particular in contact lines for trackless railways. According to the invention, the catenary wires are carried by jibs of a mast arranged within the end loop, and the catenary tension is reduced by anchoring cables that act on the mast and run approximately in the direction of the catenary wires coming from the open section, to achieve the triangle of reducing the tensile forces in curves. By this measure, the brackets, tensioning wires , insulators and the like, which are used to suspend and brace the end loops, can be dimensioned for the reduced load, which, in addition to saving on building materials, also allows a considerably lower price to be achieved. According to the invention, the tensile stress on the end loops can be reduced quite considerably, even down to zero.

The reduction of the tensile stress but at the same time means an increase in the contact wire sag, and the compliance of the conduit GPlace lateral stress caused by the current collector, if the standard spacing of the suspension is maintained. By arranging the suspension points at a relatively smaller distance from one another, this increase in sag can be compensated for without significant additional costs. Decisive for the reduction of the distance of the suspension points is also the inherent rigidity of the guided around the end loop current conductor. In the case of contact lines for railways without a gate, it is possible to lay the conductor in a smaller radius and independently of the turning circle of the vehicle, since the vehicles in this case are equipped with pantograph rods that can work with a very large lateral overhang. In such railway systems, it is therefore possible to get by with few support points even with conductors with low intrinsic rigidity and greatly reduced tensile stress.

An exemplary embodiment of the subject matter of the invention is shown in the drawing. Then the double-lane line, consisting of two positive contact wiresa and two negativon contact wiresb, is routed in an end loop. At the last suspension point in front of the end loop, on the cross tensioning wire, each individual driving twist is gripped by an anchoring rope and part of its tension is withdrawn from it. The sides attack the mast. The F.ahrdrähta, b are therefore laid along the end loop with reduced tensile stress. This measure makes it possible to carry the entire end loop from just one central mast and, furthermore, to keep its radius exceptionally small. The central mast carries a number of cantilevers in a star shape , from which the contact wires ff, b are suspended. The distance between the suspension points depends only on the permissible contact wire sag and the resulting curves. The transition curve of the contact wires a, b between the straight stretch and the end loop is formed by sloping guy ropes from the mast.

In the contact wires. would with the small radius of the end loop there are sharp kinks at the fastening points. To avoid this and creating a flattened transition arch are in themselves used for overhead lines known elastic contact wire carrierf. The illustrated final loop requires substantial lower material and manufacturing costs than final grinding of the known type.

The invention is not limited to the example shown and described, in particular not restricted to contact lines without track; she can can also be easily transferred to contact lines for rail vehicles-u-c.

C.

Claims (2)

PATENT CLAIMS: i. End loop of double-wire contact lines, in particular for trackless railways, characterized in that the contact wires are carried by the cantilevers of a mast (d) arranged within the end loop and the contact wire tension is carried by the contact wires acting on the mast, approximately in the direction of the contact wires coming from the open section Anchoring ropes (g` is reduced. 2. End loop according to claim i, characterized in that the angle points of the contact wires are converted into continuous curvatures by elastic supports (i).