DE1146934B - Electric line, in particular ignition line for radio interference suppressed vehicles - Google Patents

Description

They are ignition cables for radio interference suppressed vehicles known that a conductor with high ohmic resistance made of self-non-conductive non-metallic material such. B. Textite fibers or the like., have, which are coated with a coating of semiconducting or conductive material, e.g. B. a soot or Graphite slurry.

To produce such a conductor you have z. B. a braided strand made of polyamide fibers is used, which are subjected to a chloroform treatment to remove glue and lubricant residues had to be and after drying to improve the surface wettability of the Fibers passed through a wetting agent bath and, for graphite application, through a colloidal graphite suspension became. Then the braid had to go through an eyelet to press the graphite into the braid structure drawn with a smaller diameter than the diameter of the strands and finally with boiling Water treated so that each individual fiber of the braided strand with an equal strength electrically conductive graphite coating is provided. It can be readily seen that the manufacture of this Head is very expensive. Despite this effort, the adhesion of the graphite was poor, and therefore the whole system was subject to great fluctuations, especially when exposed to mechanical stress in conductivity.

Linen threads and cellulose threads have also been individually treated with conductive compounds and then these assembled into ladders. These methods are also very complex and bring about the conductivity varies greatly.

It is also known to have conductive layers in electrical cables and wires used for shielding electrical fields or to achieve a certain potential within the cable are used from well Build conductive wires or tapes, which are either wound, stranded or interwoven to form the shielding layer or be laced. These conductive tapes are made of conductive materials such as carbon black and / or graphite, interspersed rubber. Molded strands made from such rubber compounds are also available and these are processed into ribbons by interweaving or braiding. as These tapes have not been used at the core of a line. It would also be too much of an expense to do this in terms of manufacture and space requirements.

With the new line, the disadvantages mentioned are avoided in the simplest way by that according to the invention the core of the line is made of non-electrical line,

in particular ignition cable for radio interference suppressed motor vehicles

Applicant:

Siemens-Schuckertwerke Aktiengesellschaft,

Berlin and Erlangen,
Erlangen, Werner-von-Siemens-Str. 50

DipL-Chem. Georg Sam, Neustadt near Coburg,

and Max Schwemmlein, Haarbrücken (district of Coburg),

have been named as inventors

conductive, coated with a conductive mass textile tapes is formed, which twisted into round conductors or are wound.

The individual strips are cut out of a web of fabric coated with conductive compound in a width required according to the desired conductivity. The conductor is advantageously made from at least two layers of such strips, in particular by spinning. For example, an inner twisted band can be wrapped or spun with a second band. This conductor made up of the tapes is coated with a conductive varnish. This lacquer must be such that it glues the conductor structure, creates a smooth surface for the application of the insulation and connects to the same when the insulation is applied. Any necessary correction of the conductance can be made by applying several coats of this varnish. This type of ignition cable is characterized by an extraordinary stability in conductivity.
In the figure, an embodiment according to the invention is shown.

The conductor consists of an inner twisted band 1, which is coated with a conductive compound, over this a second tape 2, also coated with a conductive compound, is wound or spun.

The entire conductor structure is then coated with a conductive varnish 3 so that the strips stick together and a smooth surface is obtained. The lead

309 549/262

varnish is such that it comes with the overlying insulation 4, for example made of polyvinyl chloride can exist, connects.

Claims (6)

PATENT CLAIMS: 1. Electrical cable, especially ignition cable for radio interference-suppressed motor vehicles, with a conductor of high ohmic resistance made of a non-metallic material that is itself non-conductive, z. B. textile fibers or the like., And a coating of conductive material, characterized in that that the core of the line made of non-conductive, coated with a conductive mass Textile bands is formed, which are twisted or wound into round conductors. 2. Line according to claim 1, characterized in that the core of the line consists of a twisted, with a conductive mass coated fabric tape, on which another mass coated Tape is wound. 3. Electrical line according to claim 1 and 2, characterized in that the soul of the Line, which consists of twisted fabric tape coated with conductive compound or has multiple coatings of a conductive lacquer. 4. Electrical line according to claim 1 to 3, characterized in that the outer coating of the conductor consists of a conductive varnish that adheres well to the insulation above, z. B. polyvinyl chloride gives. 5. A method for producing a line according to claim 1 and 2, characterized in that that tapes are cut out of a strip of fabric coated with conductive material and closed round ladders. 6. The method according to claim 5, characterized in that the bands in one of the desired Width corresponding to the guide value. Considered publications:
German patents nos. 901 666, 848 664,
500; German interpretative document No. 1 038 139;
U.S. Patent No. 2,790,053. 1 sheet of drawings 1 309 549/262 4.63