DE632937C - Process for the production of airspace-insulated concentric telecommunication cables, especially for high-frequency operation - Google Patents

Description

It is already known to use telecommunication cables with air space insulation, especially for high-frequency operation, to be built up concentrically and to separate the conductor structures from one another by means of individual spacers made of insulating material. For these, they are arranged individually and at a distance from one another along the central axis of the cable Spacer is mainly the disk shape. The manufacture of longer lengths of such cables in single Disc-shaped spacers, however, cause manufacturing difficulties to the extent that as the spacers individually pushed onto the central inner conductor and on need to be attached to it. These manufacturing difficulties are also the Reason for the fact that longer cable lengths with such spacers have so far been carried out little instead, cables with continuous spacers themselves when these cables are preferred in their transmission properties were less favorable. To make it easier to attach the spacers to the inner conductor, Slotted or split spacers have already been used. A backup however, the position of the spacers was not possible in a simple manner.

This object is achieved according to the invention in that slotted or divided Discs or disc-shaped bodies made of thermoplastic insulating materials and in particular made of organic, synthetic materials, e.g. B. made of polystyrene, on the inner conductor put together or pushed onto it from the side and finally applied are closed by pressure and / or heat and the outer conductor is applied to it. The discs can for example only be cut along a radius line or through one Diameter section can be broken down into two separate parts, which are marked with or Put them back together without overlapping. It is advisable to do this overlapping parts so weaker, z. B. execute with gradation that the out of them composite disc has approximately the same thickness at all points. The cut surfaces do not need to be flat in all cases, rather a corrugation or a other shape of the cut surfaces for stiffening and securing the connection of the cut surfaces can be used with advantage.

An embodiment of a telecommunication cable made according to the invention is

* ) The patent seeker stated as the inventor:

Ernst Fischer in Berlin-Lichterfelde.

shown in the drawing. 2 polystyrene disks are pushed at intervals onto the inner conductor, which is preferably designed as a stranded conductor, and are pressed together from two overlapping half disks. One of the disks shown in the drawing, '; the half-discs 3 and 4. Instead of the half-discs, disc-shaped bodies with more than two sections can be used. The polystyrene discs 2 have a completely or partially closed stranded layer of copper strips 5, which form the outer conductor. It is recommended especially when operating the cable at very high frequencies, for example carrier frequencies or television frequencies, to polish or silver the inner surface of the copper tape layer 5 in a known manner Part of the stranded inner conductor 1 can be isolated from one another n. Over the "outer conductor is a watertight jacket 6, which can consist not only of lead but also of other non-hygroscopic materials. Over the watertight jacket 6, a reinforcement is arranged, if necessary, which can be made in the usual way can and ^DES: is half not illustrated.

The application and assembly of the half-panes can be done, for example, in such a way that that a half-disk is brought up to the inner conductor from two sides, joined together and by means of a pressure stamp be pressed against an optionally heated abutment, which after completion of the pressing process, together with the ram from the vicinity of the ladder again . Will get removed. The conductor is then continued a certain predetermined route, whereupon the work cycle repeats itself. However, you can also lead the ladder through a fixed abutment and only remove the ram to move the conductor further. In this case it can with a disc provided ladder piece from the abutment up to such a height be lifted out that the just pressed spacer on the example

slotted abutment can be passed. The abutment can also at the same time contain the storage containers for the polystyrene bodies. The pressing process can be derived that not only the Scheipteile united with each other, but also ίε disk as a whole on the inner conductor is firmly pressed on, which is easy to achieve, especially with stranded inner conductors. Furthermore, the individual work processes can be combined so far that the application the discs, the placement of the outer conductor and any existing ones Covering or protective layers are carried out in a single operation.

Claims (3)

Patent claims: i. Process for the production of airspace-insulated concentric telecommunication cables, especially for high-frequency operation, between the conductors at intervals individual slotted or divided spacers made of insulating material are applied to the inner conductor, characterized in that that the slotted or split disc-shaped, thermoplastic and especially organic synthetic Materials (e.g. polystyrene) after their application or assembly on the Inner conductors are closed using pressure and / or heat and then, preferably in the same operation, the outer conductor is applied. 2. The method according to claim 1, characterized in that the discs with Overlap their items are assembled, preferably with such z. B. weakening achieved by gradation of the overlapping parts that the disc assembled from them has the same strength in all places. 3. The method according to claim 1, characterized in that two half-disks on the inner conductor brought in from two sides, joined and, if necessary, by means of a pressure stamp against a heated abutment are pressed and then the conductor to the mutual Distance between the disks corresponding distance is continued, whereupon the work cycle repeats itself. ' 1 sheet of drawings