US703837A - Manufacture of braided cords or cables for electric lighting or like purposes. - Google Patents

Description

No. 703,837. Patented July 1, I902. 13. SOHURMANN. MANUFACTURE OF BRAIDED CORDS 0R CABLES FOR ELECTRIC LIGHTING 0R LIKE PURPOSES.

(Application filed Dec. 24, 1900.)

(In model. i

is ca, PHOTO-LITHQ. WASHINGTON o c UNITED STATES PATENT OFFICE.

CARL SCIIIIRMANN, OF DUSSELDORF, GERMANY.

MANUFACTURE OF BRAIDED CORDS OR CABLES FOR ELECTRIC LIGHTING 0R LIKE PURPOSES.

SPECIFICATION forming "part Of Letters Patent N0. 703,837, dated July 1, 1902.

Application filed December 24, 1900. Serial No. 40,946. (No model.)

To all whom, it may concern:

Be it known that I, CARL SGH'URMANN, a subject of the Emperor of Germany, residing at Dusseldorf, Germany, have invented certain new and useful Improvements in the Manufacture of Braided Cords or. Cables for Electric Lighting and Like Purposes,of which the following is a specification.

In the drawings, Figures 1 and 1 are crosssectional views showing the manner of braiding the conductors with and without the central core. Fig. 1 shows in cross-section a common manner of placing the cords on the conductor. Figs. 2 and 3 are views corre sponding to Fig. 1, showing different ways of applying three cords to as many conductors. Fig. 3 is a similar view, on a reduced scale, corresponding to Fig. 1, but showing the three-cord procedure; and Fig. 3 shows in cross-section a well-known manner of placing the cords on the conductors. Fig. 4 shows in side elevation a cord of the kind represented in Fig. 1.

Like characters refer to like parts in all the figures of the drawings.

This invention relates to the manufacture of braided cords or cables for electric lighting and like purposes; and it consists, essentially, in that the several wires orconductors required for the manufacture of the cords,&c., are united or connected together by the braid in the process of braiding the separate wires and can, if desired, be also laid or twisted together for the purpose of increasing the speed of braiding by reducing the number of steps heretofore employed in the manufacture thereof and of diminishing the risk of shortcircuiting.

My invention is illustrated in the accompanying drawings, in which the braided and connected wires or conductors are shown in cross-section.

Figs. 1 and 1 show the new method applied to the braiding of electric-light cords with two conductors, with and without a carrier or insulation core, respectively. The copper Wires or conductors A and B, which are first covered with india-rubber strip and cotton, are then braided simultaneously by two systems of threads d and e, which may differ externally in color in such a manner thatthe color system (Z only moves around the wire A and the insulation or carrier core T, while the color system c only moves around the wire B and around the carrier-core T, in which operation the systems d and 6 cross each other and are thus connected together. \Vhen unnecessary, the insulation -core T, which runs straight along the axis, can 0bviously be dispensed with, Fig. 1.

Fig. 1 shows in side elevation an example of the cord shown in Fig. 1. In this cord the light braiding-threads d (Z passing spirally around the core A, interloop with those 6 c, passing spirally around the core B, this inter-looping being-indicated by dotted lines. The cores A B are, moreover, laid or twisted around each other in a similar manner to the flexible electric-light cords heretofore employed.

W'ith cords having three conductors two methods of interweavin Fi s. 2 and 3, are

possible according to my invention. In Fig. 2 each wire or conductor is only covered by one system of threads. Thus A by (I only, B by 6 only, G byf only. These three systems of threads, however, cross and interlock with each other in the center. In Fig. 3, on the other hand, each single wire or conductor is braided by two systems of threads, which also cross each other and interlock. Thus A is braided by d and f, B by c and (l, O by e and f. In three-conductor cables of this kind the insulation or carrier core T can also be dispensed with, if desired, Fig. 3.

In the methods heretofore employed for the manufacture of electric-light cords, &c., each single core is braided all around by itself, and the braided cores are afterward laid or twisted together to unite them, Fig. 1. A cable of this kind has thus no special insulating or carrier-core, and consequently does not nearly present the security against short-circuiting possessed by a cable made as shown in Fig. 1. If a carrier-core be employed, (for supporting the incandescent lamp, &c.,) one is compelled with the methods heretofore employed to braid this insulating carrier-core by itself and then to lay or twist it together with the two other copper wires or cores, Fig. 8 Obviously the carrier-core has to follow the spiral rotation of the copper cores or wires, and it cannot therefore be determined what load is effectively taken by the carriercore. Moreover, by using a carrier-core ac- I core, and simultaneously interlooping the cording to the methods heretofore employed the risk of short-circuiting is not reduced, since the small distance apart of the inner copper Wires from each other remains the same. According to my new method, Fig. 1, this distance is equal to the diameter of the insulation-core plus double the thickness of the braiding and of the internal covering.

What I claim is- 1. A method of covering a plurality of conductors and a central core for electric-light cords, consisting in braiding a system of covering-threads around each conductor and the central core, and simultaneously interloopin g the threads of the several systems, substantially as described.

2. A method of covering a plurality of conductors and a central core for electric-light cords, consisting in arranging the conductors in groups, braiding a system of coveringthreads around each group and the central threads of the several systems, substantially as described.

3. A plurality of conductors, a core, systems of threads, each system braided around a conductor and the core and inter-looped with the other systems between said conductors, substantially as described.

4. A plurality of conductors arranged in groups, a core, and systems of threads, each system braided around a conductor and the core and interlooped with the other systems between said conductors, substantially as described.

In testimony whereof I have hereunto set my hand in presence of two subscribing Witnesses.

CARL SCI-IURMANN.

Witnesses WILLIAM ESSENWEIN, ERNs'r LAMBERTS.

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