US1077734A - Terminal for metal-sheathed wire. - Google Patents

Description

C. N. MOORE.

TERMINAL FOR METAL SHEATHED WIRE.

APPLICATION FILED JAN.18, 191av 1,077,734. Patented Nov, 4, 1913 Witnesses. Inventor:

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UNITED STATES PATENT OFFICE CHESTER N. MOO RE, OF SCHENECTADY, NEW YORK; ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

TERMINAL FORMET'AL-SHEATHED WIRE.

Patented Nov. 4, 1913.

Application filed .Tanuary 18, 1913. Serial No. 742,830.

l ,O77,734. Specification ofiLetters Patent.

'/0 all 411/1011- it may concern.

Be it known that I, Cnssrnn N. Moons, a citizen of the United States, residing at $ehenectady, county of Schenectady, State 4 iinsulating material which is sullicienthv rigid to prevent the, wires from being bent at this point and immediately adjacent thereto. This prevents the displacement of .5 of New York, have invented certain new and the insulation from around the inner con useful Improvements in Terminals for ductor and also prevents breaking of the in- 1. etal-Shcathed Wire, of which the followner conductor adjacent to the point of union ing is;a specification. of the external circuit; In the preferred .\l v invention relates to .wire which com form of my invention I unite a terminal o prises an electrical conductor covered with pin to the inner conductor and to the sheath,

insulation and with a. metal sheath. but this, isnot essential thereto,

More particularly my invention relates to My invention will be more clearly underthe terminal connections for such wire. stood by reference to the accompanying The purpose of the metal sheath is to prodrawing, in which 5 ice! the insulation-a ainst wear and to hold Figure 1' is a vertical section of the parts it in close contact with the inner conductor. of a-terminal embodying my invention 'be- It is essential that the inner conductor be fore the assembly thereof; Fig. 2 is a ver-r effectively insulated from the sheath because tical section of the completed terminal; and otherwise. short circuits and leakage of cur- Fig. 3' is a vertical section of a modification.

0 rent would be occasioned. The problem of As shown in Figs. 1 and 2, a portion of providing a suitable terminal for this wire one of considerable diliicult-y. Especially v is this true in cases where the inner conduc-.

tor is small in cross section as when the wire is used in heating and other electrical resistance apparatus. In the first place, the terminal connection must be made without lectrically connecting the inner conductor and the sheath. Then the union must be ulliciently rigid and strong so that it will resist bending stresses. Furthermore, the union should be such that it will not be urned away due-t0 the high temperature it: which the inner conductor i1 raised when Ihe apparatus is in use.

The object of my invention is to produce a'tcrminal connection which will possess :ill these requisites and, which at the same :imejwill be simple in construction.

According to my invention I interrupt the lectrical conductivity of the sheath at a point intermediate of its ends. I prefer to a complish this by means of a small continuous gap iii the sheath located a short the sheathlO is removed, as by -filing, to form a continuous gap 11. and to expose the insulation 12 which may be lime or other material commonly-used in connection with sheath wire and which is firmly compacted around the inner conductor 13. A sleeve 14 which may be-of hard rubber, fiber, lava, or other durable and rigid insulating material is then slipped over the end ofthe sheathed wire. into such a position that it bridges the gap 11 and it is then fastened in place as by cementing at 15. The terminal pin 16 is then united at 17 to the ends of the sheath l0 and the inner conductor 13 as by brazing or other well known processes. In Fig. 2 the completed terminal is shown.

In Fig. 3 is shown a modification of the above described structure inwvhich instead of providing a terminal pin 16 the inner conductor 13 is connected to the end of the sheath 10 by a body of solder or other brazing material 18. In all other respects this terminal is the same as that above described.

In both of the forms of my invention above 45 distance from the end to he provided with described the inner conductor and the sheath the terminal connection. I 'then unite the are connected at the ends thereof and the -inner working conductor tt the sheath at cross sectional area of the terminal is therelhe end by means of a body of metal. In fore ronsidcrably greater than that of the this way a terminal is produced which posinn3l' :onduct0r. This gives to the first de- 50 sesses the meclmniral strength of the entire scribed form a. more rigid support for the ection of the wire-and at the same time, terminal pin it: than would he the case if does not impair the insulation of the main the same were united ouly'to the inner conur body [)Oi'liml of the sheath from the in ductor. In the other form a terminal pin ner conductor. Preferably l surround the is formed through which a much stronger v 55 gap in the Slieatn bv a bushing or sleeve of connection may 2e made 0 an external -cir cuit than "iii-the said connection were made merely to the end of the inner conductor. In'both forms the interrup'tion in the sheath "revenis'the-main portion of the same from ingincluded in the electric. circuit and v. the insulating sleeve prevents bendingor.

ing-its electrical conductivity other displacement of the parts of the ter- Va'rious modifications of the above descrihed structure will suggest themselves to those skilled in the art and are to be com sideredas-ooming within the scope of the same as set forth In the annexed claims.

What I claim as new and desire to secure by Letters Patent of the United -States, is

conductor-and said sheath, said sheath havinterrupted intermediate its ends, and a terminal 'pin united to the said sheath-and condu'ctor at an end. of said wire.

3. The combination of a' wire comprising a) thesa id an inner Working conductor, an outer and talhc sheath and insulation between said conductor and said sheath, said sheath having a small continuous gap therein intermediate its ends, an-insuiating slecvc surrounding-said p, and means for electrically uniting said conductor to said sheath at an end of said wire.

4. The combination of a wire comprising an inner working conductor, an outer rue tallic sheath and insulation between said conductor and said sheath, said sheath havmg a. small continuous gap therein adjacent toan end thereof, an insulating sleeve surrounding the said gap, and means for electrically uniting vsaid conductorand said sheath at the said end.

5. The combination of a wire comprising an inner working conductor, an enter metallic sheath and insulation between said conductor and said sheath, said sheath having a small continuous gap therein adjacentto an end thereof, an insulating sleeve surrounding the said gap, and a terminal pin united to said sheath and to said conductor at the-said end.

In witness whereof, I ha e hereunto set my hand this-17th day of January, 1913.

' CHESTER MOORE.

Witnesses: BENJAMIN B. HULL, 'HELEN Oarom.

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