Electrical cable for communication purposes

Claim 1

An electrical cable, for communication purposes, having at least two spaced-apart, insulated electrical conductor means, between which is disposed a portion having a block-shaped cross-section, with a plurality of tension-absorbing elements of high-strength fibers being disposed in said block-shaped portion; the insulation of said conductor means, and said block-shaped portion, being formed by a connecting casing of thermoplastic or elastomeric material in which said conductor means and said tension-absorbing elements are embedded in such a way that they are essentially oriented in the longitudinal direction of said cable parallel to one another; and provided between a given block-shaped portion and an adjoining casing of a conductor means, are longitudinally extending separating grooves, so that said cable has an at least three-part cross-sectional configuration; the improvement comprising a number of said tension-absorbing elements, which are distributed in said block-shaped portion; said conductor means are placed on the bending axis of said cable, which is determined by said tension-absorbing elements, by the effect of said conductor means on the bending properties, and by said casing material; an imaginary line, which connects said conductor means, is displaced to such an extent that it coincides with the bending axis which is optimum for said cable, so that the transverse central planes of said conductor means are disposed in said bending axis; bridges of said casing material are respectively formed between a given block-shaped portion and an adjoining casing of a conductor means at the location of said separating grooves, with the depth of the latter being such that said bridges of material are uniformly aligned with said optimum bending axis, i.e. are centrally disposed over said imaginary line which connects said conductor means; said tension-absorbing elements being disposed in said block-shaped portions in an unsymmetrical manner.