DE2528307B2 - Multi-core, flexible electrical cable - Google Patents

Description

20th

(In the case of multi-core electrical cables that are frequently moved back and forth during operation, a To ensure sufficient flexibility, it is customary, among other things, to insert it into the cable core of the line Bring in lubricant. For this purpose, a powdery dry lubricant such as talc is used, for example, which is held in place by means of dust-proof separating layers in the individual stranding layers of the cable (DT-AS 11 01 551). It is also known to use a waxy, silicone-based lubricant with which the Cores are coated before being stranded to form a cable core (GB-PS 6 09 366).

In the known line structures, either essential to achieve the desired flexibility more lubricant are used than is actually needed, or there is a risk that the Lubricant is gradually displaced from the stressed surface areas.

The invention is based on the object, in the case of multi-core, flexible electrical lines, the "o To improve internal friction conditions permanently so that the lines also increased mechanical Withstand stresses, especially changing bending stresses.

To solve this problem, the invention is based on a rubber or plastic-insulated line Veins from, in which a lubricant is applied to the surface of the individual jointly sheathed veins is. According to the invention, the individual wires are coated with a varnish-like lubricant.

In a line designed according to the invention, therefore, each wire with a thin layer is one solid, firmly adhering lubricant coated on the vein surface, this ensures that only slight Amounts of lubricant must be used and that there is always a lubricant coating on the claimed Surface areas is present.

Suitable lacquer-like lubricants are in particular molybdenum-containing lubricant coatings and bonded coatings on the Based on polytetrafluoroethylene, as it is known per se and in trade under the names »Molykote 321 R «and» Molydur 523 «are available. This bonded coating is applied to the surfaces of the cores expediently in a continuous process before stranding the cores to form the cable core. Here the Veins run through a basin or trough in which the lubricating varnish is contained as a solution; it also exists the possibility of applying the lacquer-like lubricant by spraying it onto the vein surface.

An embodiment of a four-wire electrical line designed according to the invention is shown in FIG Figure shown.

The line consists of the four wires 1 to 4 stranded together, on which an inner sheath 5 and an outer jacket 6 is extruded. Each wire consists of the conductor 10 and the wire insulation 11, on the one Layer 12 of a lacquer-like lubricant is applied.

The varnish-like lubricant layer can be used for all flexible electrical cables, where rubber or plastic surfaces rub against each other. This applies regardless of the structure of the And the insulation materials used. In particular, natural insulation materials are used and synthetic rubbers, polyvinyl chloride, polyethylene and copolymers of ethylene into consideration. If necessary, the envisaged layer of a lacquer-like coating can also be applied to other elements of the Cable core are applied.

1 sheet of drawings

Claims (3)

Patent claims: 1. Multi-core, flexible electrical cable with rubber or plastic-insulated cores, in which on a lubricant is applied to the surface of the individual, jointly sheathed cores, thereby characterized in that the individual wires (1) with a lacquer-like lubricant (12) are coated. > o 2. Line according to claim 1, characterized in that the wires with a molybdenum Are coated with anti-friction varnish. 3. Line according to claim 1, characterized in that the wires are coated with a lubricating varnish on the basis are covered by polytetrafluoroethylene.