DE27122C - Electrical cable, preferably as an aerial cable for telephone systems - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

CLASS 21: Electrical apparatus.

Patented in the German Empire on September 23, 1883.

The aerial cable described in more detail below enables the entire cumbersome superstructure of the current telephone system and within practical limits preserved, as well as in electrical respect the evils of the To reduce induction and thus to meet the demands for clear telephone communication suffice.

Such aerial cables are used in conjunction with ordinary aerial ducts, and around The basic idea of such a combined

To match ues from aerial cables and ordinary aerial ducts is the construction of the cable chosen so that it is of small diameter, easily flexible, and yet strong enough to carry oneself freely to such distances as the construction of telephone lines requires.

The cable is airtight and watertight and using a cable that is particularly suitable for this purpose Isolation compound consistently composed of such materials that all influences the temperature can be endured without damage.

Such an aerial cable is composed as follows:

First five insulated copper wires α are grouped around a sixth, non-insulated steel wire b of great load-bearing capacity, the latter serving at the same time as earth conductor and carrying wire. The individually insulated wires or the stranded wire produced in this way is wrapped with tinfoil c or another similar conductive material. Then five such wound strands are stranded around a core strand d also wound with tinfoil c .

The latter consists of seven or any number of steel wires with a high load-bearing capacity and also serves as an earth line and as a support wire at the same time.

The so formirte cable with 25 individual telephone lines is wound thereon with a tape layer isolirenden e and the whole with a protective coat / umprefst of lead or other metal.

The lead cable can to aufsen nor asphaltirtem or otherwise präparirtem band g or surrounded with yarn and are provided with a schliefslich whites usually paint.

The number of wires and strands can be changed as needed. Likewise can the whole covering, be it with a double lead coat, be it with the addition of one Braided wire or otherwise reinforced so that the cable is underground or can also be used under water.

For the insulation of the copper wires one can use one specially made for this purpose Any other isolating mass can also be used. The above number of lead wires as well the imaginary insulation mass corresponds to the lightness and manageability of the cable.

concerns, the practical applicability and the usually prevailing need best.

Claims (1)

Patent claim: The use of insulated lines with non-insulated load-bearing wires of high load-bearing capacity in the individual strands, as indicated above, with simultaneous occupation of the isolated Wires or braids with conductive material and the grouping of a number of them Strands around a common core strand, the core strand also with conductive Material is wrapped and this together with the individual inner supporting wires of the Litz wires serve as a ground line. For this purpose ι sheet of drawings.