USRE13145E - A cobpoeation - Google Patents

Description

BEST AvAsLABLE coP.

C. W. DAVIS. TERMINAL POR ELECTRIC CABLES. APPLIUATION FILED MAY 19. 1909.

Reissued Aug. 23. 1910.

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WITNESSESI Yground cable is BEST AVAILABLE coef l UNITED VSTATES PATENT onnron.

CHARLES W. DAVIS, OF EDGEWORTH, PENNSYLVANIA, ASSIGNOR T0 STANDARD UN- DERGBOUNDCABLE COMPANY, 0F YITTSBUR-Gr, PENNSYLVANIA, A CORPORATION or' PENNSYLVANIA.

13,145. Original N0. 919,880, dated April 27, 1909,

To all lwhom 'it 'muy concern.' y.

` Be it known that I, CHARLES W. DAVIS, re* siding in ldgeworth, in the county of Allegheny and State of Pennsylvania, a citizen of the United States, have invented or discovered certain new and useful Improvements in Terminals for Electric Cables, of

serial No. 377.435. Serial No. 497,129.

which improvements the following is a.

specification.

My .invention relates to improvements in ljn'evcnting the ingress oli moisture Within the cable sheath, and to guard against leakage, Where the sheath is interrupted, as at a terminal, where a lead-sheathed underjoined to an aerial line or lines.-`

Caldes or" ordinary constructir'niy contain insulating material of hygroscopic character,

and in such case any moisture which gets access to the interior tends to .destroy the insulation and toperrnit leakage.

In the accompanying drawings, which 'form vpart of this specification, Figure l shows in vertical section a terminali lor a cable embodying my improvement. Figs. 2, 3, and Ll, show structures similar-to that of Fig. l, but with modifications in detail `which forni parts of my present invention.

In Fig. l I have shown my plug construction combined with other parts to forni a complete terminal. In this construction, the plug consists essentially of acentral core of contlucting material, ando a surrounding pelticoated insulating body. This central core may be a single integral piece, as shown and described in Letters-.Patent No. 881,777, dated March l0, 1908, but is :preti erably formed of 'two parts la and-.1", the part l being of annular form andliaving the insulating body 2f formed ,upon it, and screw-threaded Within to receive the part la, which is correspondingly threaded. Thus the part 'lL may be separated from and moved relatively to the part lb and the insulating body 2, for the purposes presently to be described. The part il, that is tbe stufrounding -body or' insulating material formed. as described, has a screw thread 5 formed upon its outer surface for the purpose of attachment to the other parts,. wliich together with it form the terminal structure. 'This screw-threaded surface obit-ends r-abovc the ilane of 'the lower edffe oi? the )etticoat' 4 and thus the 'oint eiufectivelr a y J TERMINAL FOR ELECTRIC CABLES.

Specification of Reissued Letters Patent. Reissued Aug, 23, 1910,

Application for reissue led May 19, 1909.

protected against the Weather. This terlninal, illustrated in Fig. 1,.is-peculiarly applicable to a cable consisting of a single conducting core. I employ as a case or shell the thimble 6a, which is substantially cylindrical in form; at one end, the thimble is of suitable size to slip over the lead-sheathed cable 7 and to be attached thereto by the wiped shouldered joint l0; at the other end, this thiinble is connected to the plug, preferably in such manner that the point of connection will be lprotected by the petticoat. These parts, nainel" the plug with its removable piece la an the thiinble 6, are constructed in the Iactory ready for eld use. The manner of applying them 'will be readily understood. v

By making the core of the plug in two vparts, connection with the cable conductor can be readily made, by what is known as a sweated joint, which in such constructions is ordinarily ar preferable. the cable, W-hichin this instance is a cable having a single conductor.. is first. stripped of its lead sheath and of the layer. of in sulating material, and' the conductingcore 8 is itself laid bare. To this bared end of the conductor the central portion 'la of the plug is electrically connectedby the familiar lsweated joint. Nheu the part la is thus connect-ed, the thimble 61L is slipped down over The end of the end of the cable and the part l" With the petticoat insulating body molded upon it, is then slipped over the part l and'screa'ed down to position. The thimble 5 is then attached to the plug and .its opposite end secured by suitable means, as a wiped joint, to the sheath of the cable.

In case the material of which the insulao ing body 2a is formed is of such character that said body. would be inj uriously aliected by heat conveyed to it through the junction box or thiinble at the time. of loro. the wiped solder joint, in consequence o. the relatively high conductiyity ot the material used to t'orm such thinible, I may resort to either of two expediente. I n-.ay in are seinbling the parts,'us`e a guide provided 'with screw threads corresponding in size and position with' the screw tl reads of parte Il" and 2, and first apply such guide in place or the 'insulating body to the core la, and

assemble the. 'tlliinble and maite the wiped lll `f lowI h eatoonduotivity. The di'eulty in thi lzo y will afterward be sha' ed to' form" the .,ngiogetherof paris 2' e'nd 60; but: these ,pfy'ts will 'be unitedwhen applied, and they will beapplied 'as one over the part 1** material' f lht'A .50. u `by metal as brass, in-fvhiehY the aerew thread 1ead tub e to the shape-indicated `in the draw- .coirngae as Shown Fig. 3. 'ing this elerna''fl've last described, the lead be hardened 'by the addition of n' Smell prol .BESTAVNLABFE CQP' ,parte if" and 2L in plaoeof'i. nSuChloaSe l the threads Whefeby the core is Connected "to the eondne'to1-and theinsolating ph1g to the thimble should be Similar in pitch and direetio'n.' This construction/is also edwin-1,

tageous, asv it peijmitsofthe renewil oflihe insnlakiin plug Withot dethlngj the thimb'le .rom the sheath, and also the fey* Illlingof the thinible with insulating nifl,-4 teral. Or, I may forni the thimble itself wholly or of a materiel of''elatively connection 1S' dueto the feet that' Sn b. metals as areof ioientherd-ness toi ret thread tapped upon them, are i'hurily: of high thermal condliotilijt g andnyrW-ill ne 'found oest, under practica Conditions, to form the opper end of the t-himble of 'such 'a may'be formed, sind the lower end oflsu'ch metal as lead which inni-relatively low heat conductivity.' This is indicated mfA Figs. l and 4@ Qn'the other hand, it may be rea- :Eerredto forni the znixnhle entirely'of ead in the following manner.. When the body of insulating meriel 2C (see Fi'g) is formed, it may bevmolded within a leadtube which thixnble by desvsin'g in t e free end offthe' ing's. l'n this case there will.4 be no screwand the cahleend afte'the sweeted joint has been formed.' When apnlie'd andrseated the wiped solder joint 10 'will'he formed. 'The inner Sur-face of the tube upon which the insulating body* iemolded will preferablyvbe In followof Whieh thetnbe is formed will preferablyportion of tin.

Ii; will' beobsei've. than if deired,3l1e^interior E."e'paee Within 'ibliimble 6, may be lled with some Huid, or'v'is'eid insulating ind-iii will Le :further observedsnitably constructing' and arrani l 1,145' v i i a iii-rterrnpgted.4 f.

the 'terminal A are plac ing 'the perfs, Ehe upper end of thletfhiible 'mhwy made io abili agalnstfthe body-- of inulating material f2? Within the protec# :nav-be introduced bifther secure l.

lending' downward and pli-omo tion of the pet-@coat 4. VHere @gasket 15 he' joint against ingrese of *mois t" be undestoodi-hohehex-iai may oonnected with the projecting enc-i l* o. "he lien` mina] slirnctime in any-desired or 'ferrand manneij'. I will undestood tlimthe po, sition of this 'terminal when eomplecody should preferably be sube 4 ily 'that Shown, withy the pettiooet ll-:ofthe plug enr` would be defective.

encircling dmvnvvm'fllv fermier I, .I

o' surface, the conducto." arranged in Subs hiel-vggoeition; so. thelilfkage from-"vibe aerial tov the leadv s'breltl1`- is As .Will'be`y nadily understood by those' skilledinhe art, there is a tendency for I11f-tl1e construction shown end 'desciibed`- jcore or Vconducting elements vlvhich conneol;

'the cable conductor to the 'eifiel, is piothe non-cond`ucting pl'when thelpertpf inpropen position on the -cable.`,,v 7 V,

.The variation-shown in Fig. from the structure shown in Fig. `:1 lieg,p'rinieri.1y in forming a thimble of two pieces' 6" and 6,

. screw threaded o be lsecured together 'in' the manner shown,I he ,that instead 3 of et# -teehment tothexeable ASheehbyjhef/wiped Y soldered joint 10 of Figgl, eonneetinjl'nay be made 'by-,meensof 1 stuffing gland 16..

In this modification: alsotheconnectionbetween-the insulating ,body 2l andthe thimble lgin'steadmf beig extei'nal in' respect'J to the insulation is `ine1 r1e1. Iii/'this -instanfeetom .is'ehown ,menne whereby 111- :innate .contarte :may be maintained between f the ycore of ehe plug en djits 4suivonnding body ofv insulating materiel, 1althoughthe material of which `she'insuhtin formed,is 'such that es. the (insu ating substance grows coolerjt -expends reltvely to,

the veonduating body. ,lf suehwere Itli -e'c9,se

ineons'truction illustra'tedinflqig.ll for in-v stence--tl1at, ie, if he substance of which body isormed e'iipanded ,'elatiyely Vto Qthe central body 31? as the4 newly, .molded body fthe contacting sufaees. would tend to Apon., Vandiso far as -they' night-,open the stm nu Inl Figi@ I hauveV Shown the body -lhfprmided exteriorly with' an 'in- .n'ferdly enlarging, oavity 1 7 and the insolab body qmied overltliatg surface 'of the parti-1' which 1s, provided with thiS inwziidly 4and thns Surfaces of fion fiom .the ,ferm chown in' Fg. .1.' In this instan@,the/ 931:59 of theyeenttalme 1s ir, :15a 'donnine .infsliepg .sind `is made to I :ezn' upon he body 53. The ennulus l may body be,

body' y2l expands 1 -vided with@ ,shouldn whihbem against :SEST AVAILABLE COP`1 be grooved ,along its inner edge 18, and into this groo-ved inner edge, the 'body 2 may be fitted. It will be observed.v that in this instance also, relativo expansion ofthe substance of body" v2 compared with body 1b will but serve to increase the .closeness of the union of the two bodies, As in the .other in stance, the body 1* may eXtendtbrough-the body 1b and the parts be Secured tgether by a screw thread 'if desired.

In forming a connection between the conductor of a cable and auaerial line, the in sulation must be removed from the conduc- 1tor of the cable for a short distance and provision must be made to prevent-moisture penetrating the insulation of the cable.

These ends are 'attained in my improved construction, wherein a body of insulating material is applied to the bare conducting surface beyond the insulation of the cable and preferably closely adjacent to the end of such insulation, and a sleeve or thimblo extends from the insulating bod metal sheath, being secured to t exlatter preferably by a wiped joint. The insulating body is detachably secured to both the con- Aductor and to the thimble as by screwthreads. This construction permits of the thimble and insulatingbody to be put to.- gether, slipped on to the conductor and, when the aerial and conductor have been electrically connected, the insulatedbody secured in position on the conductor, z'. e., screwed onto the threaded portion thereof, thereby bringing the thimble into Aproper position Where it is secured to a sheath 4by a Wipe joint. The insulated bodycan then be unscrewed from the conductor andthimble, 'the latter filled with insulating material and the insulating material and the insulating body replaced.

l claim herein as my invention: l. A terminal structure for an electric cable consisting of pliignand a case or thimble,.said plug 'consisting a centrally arranged and vertically disposed conducting core and a surrounding bodyof insulating i' material 1n moisture tight Vcontact thereon,

and formedexternally with a surrounding downwardly and putwardly flaring leakage preventing petticoat, said case or thimble being in leakage proof engagement with the cable sheath atoneI end and with the plug at, l

to the ducting core Yadapted to be electricall lating material in moisture Atight Contact thereon, and formed externally with a sur roimding downwardly and'outwardly ilaring leakage preventing petticoat, and said case or thimble having a. leakage proof en gageinent with the cable sheath at one end, and the plug at the other. end, the engage ment ,of the case or thimble withthe plug being arranged within the protection ot the pettcoat, and a gasket )between the body 'of the case or thimble and the body of the plug.

In a terminal struc-ture a`nd`in combination with a case or thimble engagingasheathed. cable, a plug engaging such case or thimble, auch plug consisting of a core formed with two separable parts, one of be made with an aerial wire, and .the otherpart of said core adapted to be connected electrically with a cable core, the 'parts of saidplug being arranged and. constructed to be brought together and united ,to the ex clusion ofmoisture from their point of union.

5. A\terminall -structure ,for a metal Y sheathed electric' cable' consisting of a conconnected with the conductor ofthe cab e and with an aerial wire, a body of insulating material surroundingand making' a'moisture-proof engagement with said core and provided externall with a surrounding downwardly exten ing leakage preventing petticoat, anda thimble having' its ends formed respectively of materials of different character, the harder metal engaging the body of insulatingmaterial and the metal of the lower conductivity securedby a wiped joint with the cable shath. y

6. A terminal structure for a metal "sheathed electric cable consisting of a body of insulating material surroundingand having a moisture proof connectlon with a, con,- ducting coreand provided wlth a surround"- -ing downwardly extending leakage preventing petticoat, a core adapted to be electrically connected apt-its ends with the conductor of the cable and `with an aerial wire, and

BEST AVAILABLE com i' nection therewith 'and/provided with. awsu'rf.v f

roundingI downwardly extending leakage. preventing pet-ticoatI and a` metaly thimbleyhaving one end secured' to the-metal sheatlr and the op osite end connected ltoutheinf'y sulating bo T,' the ,pint of connection with the insulating body `being above a plane coin-- cident withfthe lovfer edge vof the petticoat and overhang by the latter.` l

8. Atwo part terminal structure lfor alead' sheathed cable, oneof said4 :parts 1being formed f :insulating material' inmoisture proof contact jivith theconductor and pro videdA with@ apet-ticoat;they other "of said parts securedb -joint--tothe cable sheathan ieonmacted with said-.first petticoat thereof.-

' named 'partbeneathheyprotection'vof the 9. A two 'part terminal structure for 'pros t-ecting the'connectionfbetween a cable core and an aeral line, "one 'ofsaid 'parts 'consist-A ing of abonduct'ingelement adaptedltobform the electrical connection :between the 'conductor of the' cable andi the aerial line, and

having insulating' :material secured in moisture-proof contact "thereon an'd' provided with a pettic'oat, 1the' otl1ex'o`ilsaid secured byv herineticali-'join't to the cablev sheath and 'connected' with said Yfirst naniedpart beneath f t'lie protection of -the Petticoat. U 10. A two' ipart' te'rrninalv 4for 'afl'netal' consisting "of a sheathed insulated cable, metal thilnbleadapted to be secured at vone fat-1 one end tothe cablesheath ,its opposite end threaded., al ,baredconductor described." y "In testimony whereof, I have hereunto CHARLES W. ioiwis.`

tor beyond the insulation of the cable and secured to the thimble, the body of insulatrin material having a sleeve or prolongation adgapted when thefparts are assembled and applied to y'form a shield or screen between .the bare conductor and the thimble.

'11.L ,A two heathed insulated cablehaving in combinapart terminal -for a metal -tion a metallic thimble adapted to Ibe secured and having having screw threads al'dbanlannular body f :of insulating material provided Withscrew Y threads. to engage the conductor and the pitch thereby permitting the insulating body to be simultaneously applied to or detached from the conductor and thirnble.

v4l2. A terminal structure for electric cables having in combinationa tlnmble secured to the' sheath of the cable, for connecting the cable vconduct-or to an annular, non-conducting sleevey connected to. the conductingelement and the thixnble,4 and fa-disk carried'bythe conducting element and adapt-ed to'fornx atight joint with the end of the sleeve around theconducting element.- I

'13. Al 'terminal structure for anelectric cz1bleconsisting ofa :plug and ar-.case ory thim'ble, said plug vconsisting oia centrally arranged and vertically disposed conducting' core providedl with a shoulder, a surrounding vmaterial -in moisture- L 1 body' of insulating tight contact :upon said-core. and makingen= `,thi-niblefthe .several Ithreads being of like a conducting element A i aerial,l andwsecure'd Ito suc-.h conductor an,y

gagexnent uponsai'dflshoulder against longi-I y tudmal'-dlsplacenientg'the said case or thixnblel engaging the' cable sheath at one endl and thc plug set/my hand;

' A,Vit'nesses ALICE A.: TRILL',

3..HL15BERT BRAULY.. l' i, t 1

at thebtner end, substantially

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