Remote control cable

DETAILED DESCRIPTION The present invention achieves an inextensible conducting cable which exhibits improved characteristics relative to the previous cables, particularly with respect to the spacing and holding of the conducting wires set in its central part.
Another advantage of the cable according to the present invention resides in the fact that the volume occupied by the conducting wires in the cable is reduced to a minimum whilst retaining a spacing for the conducting wires, which is suitable for good electrical characteristics.
The invention relates, therefore, to a remote control cable comprising two conducting wires separated by a central element, reinforcing wires parallel to the said conductors, at least one layer of lapping which covers these elements and at least one external coating layer.
The invention is further characterized in that the central element separates and holds the conducting wires parallel and is in the form of a continuous element comprising two longitudinal recesses arranged symmetrically relative to a solid central portion.
Each recess encloses a conductor over more than half of its periphery and the external surface of the separating element forms, with each of the free surfaces of each of the conductors, a continuous surface of generally elliptical cross-sectional shape.
Preferably, the central element for separating and holding the conducting wires surrounds the latter over two-thirds of their periphery, the distance between the two conductors being between 0.
03 and 0.
06 mm.
Advantageously, the material forming the central element is a heat-fusible, homogeneous material having a low dielectric constant, and is, for example, made up of a mixture of waxes, paraffins and low molecular weight polyethylene.
As materials which give good results, there can be cited synthetic resins or waxes based on linear hydrocarbons, such as those marketed by EASTMAN KODAK, under the trademark "EPOLENE".
The conducting wires are preferably enamelled copper wires.
The reinforcing wires which are placed parallel to the core are preferably in the form of a bundle of parallel wires, arranged concentrically around the core so that the latter is perfectly enclosed