US1227211A - Means for preventing current leakage in electric cables. - Google Patents

Description

S` D. SPRONG & VV. E. McCOY.

MEANS Fon PREVENHNG CURRENT LEAKAGE 1N ELECTRIC CABLES.

APPLICATION FILED DEC. I2. \9l6.

Patented May 22; 1917.

UNITED STATES PATENT OFFICE.

sEvEBN n. sPRoNG'aNn WALTER *r1-Macomer N'Ew YORK, N. Y.

.MEANS son rnEvENTINd CURRENT LEA-Kaos IN ELECTRIC CALLES.

Be it known that we, Seven-N D. SvuoNo and lVa'L'rnn E. McCor, citizens of the United States, residing at New York,l iu the county of- New Yorkand State of New York,-

have inventedV a certain .new and useful-Imrovement 1n Means for Preventing Current leakage-in Electric Cables,- of which the 'followingis aspecifi'cation.

The invention relates to the prevention of current leakage in electric cables, and -is an embodiment of the principle set forth 1n U. S; Letters PatentiNo. 1,165,140, audll. S. 1LettersPatentNo. 1,105,141, granted to. us

December 21, 1915. The invention consists' lineg/,y'y of Fig. 1'. Fig. 3 is a longitudinal 'recesses N which receive-the conductors A section of an end portion of the joint on the' line 2,2 of Fig.'2. Fig. 4 shows onel of the blocks Lyin perspective. n

Sim'lar letters of reference indicate like parts.4

. A and B are line 'conductors inclosed in the usuallead sheath C, C. Each line inductor.'

comprises an internal metallic con uctorD and an outer insulating Veoverin In'applying our invention, We procee as followsz'.

The lead VsheathsC, C are eut baektoexpose the 'ends ofntheli'ne conductors '.A, B, the inf' sulating coverings E .of which 'are also re-` moved for a certain distance. The metallicconductors are 'connected by'any suitable coup1ings,-1is shown'at F. We thenvplace' upon each'carble similar tubes G, Il, Aeach formed of a plate of fiber or other insulatin material, with a Hat sidefl and a longitudn.

J oppositesaid {iat-side. 'The'twg H aredisposed with their flatsides on them 'is-placed a nal ga 1 tubes I in contact, an'flu cylindrical tube K o -fiber or other insulat` lng'material. The leng'tluof the inner tube". ss--than that of tli'e inelosing tl'lbe such'l'; 's orcelain. 'The .outer end-faces M of each' lock are curved t'o lfit the tnbe'K.

On Aopposite sidesv of the'block are concave spe'cination of Letters raient.'

' above--describedl' Flnto the ends of tube K we insert two' Patented D Ia-y'22, 11917.

Appliea'mn mea December 12, 191s. semi m. '1ae,4'o2.

B. On` the .ends of one face of the block are projections O-,triangularin cross section.

-When the block is i n place, the projections (l enter ,between the inner tubes G, H, and abut against the' ends of said tubes. ,The oliter side P of each bloclcis-'preferabl' fiat and registers .iviththe end ofthe vtube l( shown in'FigJ. Because' the blocks L receive the conductors A, B in their side recesses N, they aid'in keeping said conductors in properposition. The projections-Oserve as abutmentstopi-event any longitudinal displacement' lof the tubes (i, H within the tube K,"and also retain said tubes in proper relative position.

Before the parts are assembled, we place upon one end of the sheath Ca sleeve Q of similar'metal, which is slid back on said sheath until ,said arts are assembled, as

Spidfsleeve is then moved forward to cover the -said'parts and to overlap the ends of the leadA sheath C, Cl 'Itis then united-'to one end 'of s'aidsheath,'pref -erably .bya' wiped joint, as shown .at R. Through the open end of. the sleeve we introducea lling of insulating material, indicated at S, which permeates 4the interstices within'sleeve Q. 4The openJend of the sleeve is4 then closed b .a similar, wiped joint R.

.In'Fig 1, this ii ling' is shown at one end of the tube K It is vomitted-elsewhere in Fig.

1, and also in Fig. 3, for the sakelof cleari ness 1in showing theparts.

Withjthis construction, any leakage eur-V rent4 starting fromone metallic conductor, as

A., must pass through the iilling S to the gap J 'in tube G, and thencethrough the' joints betweeii -said .tubes G, H'and tube K tothe gap in-tube H, and then through the -filling in that tube before it can reach' the metallic cone'uetonB, which is practically 'impos-j sible. 'We thus secure effective insulation of. both conductors A., B, and eliminate current leakage f rom one to the other. The dielectric strengthof v.the material of tubes G, H isto be greater than that of the filling S.

1'. A n electric` cable,`comprisin'g Van inclosn'lgtube of insulatin material, two jointedV -li ne..con'ductors therein, a filling of insulating, material in said inclosing tube andinlner tubes of insulating material oi greater dielectric strength than said filling embeddbd in said filling and r ectively inclosigv .said conductors, each of vsaid inner tubes havnc side. and the said flat sides being` in contact, and each of said tubes hayi'n a longitudinal gap in its wall opposite its at side. f 'l 2. An electric cable, comprising an inclosing tube of insulating material; two

jointed line conductors therein, a filling of its fiat side, the said inner-tubes being of less length than said inclosing tube, and blocks of insulating material 4disposed in the ends of said inclosing tube and abuttin l against the ends of said inner tubes.

3. An electric cable, -comprising an inelos-l ing tube of insulating material, two jointed line'conductors therein, a filling of insulat- .conductorse ach of S ,a flat side, and the said fiat sides-bein in at their-'ends lateral tubes of insulatin material of greater dielectric strength t, an said filling embedded 5 in said filling and respebtiv'ely inclosing said inner tubes having contact, and each of said'tubes having' a ongitudinal side, the sald inner tubes being of les's 'length Vthan said inclosing'tube, and blocks lSoif 1n- -sulating material dis osed in the ends of said inclosingtube an abuttin a. ains't the ends of said'inner tubes, the sai b rejections entering the spaces'betweensai inner tubes and saldinclosng tube.

In testimony whereof weh'ave aixedour signatures in presence of twowitnesses."

SEVERN D. SPRONG. e y WALTER EMCCOY. Witnesses:

GERIRUDE T. Poma,

my r. Moslim.

ing material in said inclosing tube, innen;

gap in its wall opposite lts fiat 30 ocks hav- 35

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