US398442A

US398442A - William

Info

Publication number: US398442A
Authority: US
Publication date: 1889-02-26
Anticipated expiration: 1906-02-26

Description

UNITED STATES PATENT OEEicE.a

winnmita-pasurrmsoncor piucase, ILLINOIS, AssieNoE 'ro 'ri-1E WESTERN ELECTRIC COMPANY, or sA-'ME- PLAUE.

TELEG RAPH-CAB LE.

SPECIFICATIGN forming part-of Letters Patent No. 398,442, dated February 26, 1889.

Application timmy 18,1387. serai No. 244,602, (Nom-tau.)

To @ZZ whom it may concern.- l lBe it known that I, WILLIAM R. PATTER- sN,.a citizen of. the'United States, residing j at Chicago, in the county of Cook and State i of Illinois, have invented a certain new and l y useful Improvement in Telegraph Qables, (Case 73,) of Whiclrthe following is fa full, l clear, concise, and exact description, reference being had to the accompanying drawings,

1o forming a part of this specification.

My invention relates to telegraph-cables in which the conductors are separately insulated with a fibrous material and formed into a core which i5 pmtectedbv a Water-proof pipe, the i I5 4space remainingin the pipe about and among the conductors being filled with an insulating material which is preferably forced in charged with gas. Heretofore in this class of electric cables the core has been formed by twisting 2o the insulated conductors together and binding them together by a strong serving, the conductors being compressed by a die just before the serving as the serving is being wound'on. In this manner the electrostatic capacity of the cable is greatly increased and its usefulness thereby impaired.

My invention consists in simply loosely twisting the conductors together and dispensing with the serving, so that the core, when 3o surrounded by the lead pipe, will substantially. fill the same, and the wires, being only twisted loosely together, the insulating filling l of paraffine or other substance will become solid asl it cools and fill, as it were, in mass 3 5 the spaces between the different wires.

Heretofore the, paraine that has been forced in has mostly formed in an annular ring about the core, the core itself being penel' traten to only a slight extent by the suing. i

4o In order to thoroughly saturate the tibrous covering, it has been necessary to soak the core in insulating material before the core is drawn into the pipe.

According to my invention -herein, it will '1 be selen that all unnecessary compression of the fibrous covering of the core is avoided, and the conductors are soevenly distributed and uniformly protected that the electrostatic capacity of the cable is greatly reduced and g at the same time made more uniform, thus 5t increasing greatly the utility of the cable.l

vThe methods and apparatus employed in manufacturing the cable herein described are claimed in other applications filed herewith, and will therefore be referred to herein only incidentally. It is evident Vthat only comparatively short lengths of a loosely-twisted core of fine wires'without a serving could be pulled into a lead pipe Without injury to the conductors, unless the lead pipe were much 6o larger than the core. Therefore, while it is practicable to make my cable herein described by this old method ofY drawing in -thecere ii'- would be expensiveand liable to causejsome slight injury to the conductors. l therefore preferably use the. method described inmy `application of even date herewith, No. 244,601.

Having thus briefly indicated some of the processes by which my invention herein may 'l be carried out, I will refer to the drawings, in 7o which- Figure l is an enlarged section of my cable.

Fig. 2 is a side view of the slightly-twisted core. The pipe o., it will be seen, incloscs thecore,

, the different wires, b, of the core being scparately insulated by fibrous covering c. The: dierent insulated conductors, it will be seen, are not closely pressed together, as heretol fore, but are so disposed that the spaces 8o among them and between the interior of the pipe and the outside wires will be substani tially uniform. Thus, when the insulatingg filling d, of paraiiine or other substance, isl

forced in, it will distribute it^elf not only about the core, but also to a certain extent in mass among the conductors, and. thus, with a given-sized pipe, the conductors will arrange themselves so as to utilize the whole space within the pipe, and, none ofthe con- 9o ductors being closely compressed together, as

heretofore, the cable will be of very low electro-- static capacity-as low as is consistent with the size of the pipe. 4

Havingthus described my invention, I claim 9 5 as new and desire to secure by Letters Patent- As zg new article of manufature, a cable eonsising of an unserved core of separatelyinsulatef conductors slightly and loosely visted together, an exterior pipe inclosing said core, and a lling of insulating material forced int-o the pipe among and around the conuctors of the com, said insulating-filling being sodied when mld, lik pamfne.

WILLIAM R. PATTERSON.

`\\' im esscs:

GEORGE P. BARTON. WM. M. QILLER.