US805260A - Insulating-bushing. - Google Patents

Description

PATENTE) NOV. 21, 1.905. J. G. GALLAN.

INSULATING BUSHING.

APPLICATION FILED AUG. 28, 1902.

Inderwbor, John @.Cal lan, @y

Fig.

yrotin o.v CALLANQOF UNITED stares PATENT OFFICE..

Llp/'N N MASSACHUSETTS, y ASSIGNOR TO GEN EP AL ELECTRIC COMBANY, A CORPGRATQN OF NEW YORK.

` INSULATIidG-BUSHHNG. i

No. scacco.

.To will whom it may con/cern:

Be it known that I, JOHN G. CALLAN, a citizen of the United States, residing at Lynn, countyot' Essex, State. ot' Massachusetts, have invented certain new and useful Improvements in insulating-Bushings, of which the following is a specification.

This invention relates to bushings of insuiation. for use in electrical apparatus, and esl peeialiy for :insulating the shafts in Thomson I recording wattmeters. Such bushings are i necessarily of smali diameter and are somewhat expensive to make by methods heretotore known to me.

vscribed in the said l My invention aims to make bushings at los' i cost andV of vany predetermined diameter, I though it` is most useful in making bushings I up to about one-eighthot' an inch.v The material which I prefer to use in making such Il bushings is that described and claimed inthe i patent of'Thomson and Uallan, reissued May 27, 19.02, No. 11,997. lhis material is an acetate'of cellulose; but l do not wish to limit myseif to this particular compound, as any l other insuiating compound capable of iiianipulation in the manner hereinafter described may be used. i omit from the process depatent when making bushwith my present invention the special means vfor securing adhesion.

i ings in accordance l The method ot making insulating-bushings l i l l l l 'which i have invented consists in applying' to a metaiiic wire of the desired diameter a series of coatings of the insulating material seiected and after drying the saine stretching the wire in order to ioosen the coating of insulating' material, which 'ofi the wire in the form a tube and cut up in lengths as desired for use. i In the accompanying drawings, Figure' is a perspective view of a Wire coated with insulating compound and niciied at -intervals to i facilitate the separation of the coating into l suitableflengths of bushing. Fig. 2 isasimil lar View showing a coating separated into i i can then he slipped lengths. Fig. 3 is a perspective view '-i one of the insulating-bushings made in accordance with my invention. y

' in carrying out my invention i join together the ends of the wire l of a diameter required for the inside of the bushingand then run said wire continuously through baths containing theliquid insulating material until the thickness of theseries of coatings thusl Specication of Letters Patent. Application iiled August 28, 1902. Serial No, 121,317.

Patented Nov. 21, 1905.

sufficient to insure the The coating-machine may applied to the wire is properinsulation.

be similar to that shown in the Thomson-Callan patent above referred to. Precaution should be taken to prevent the coating from adhering closely to the wire in order that its ready removal from the wire may be insured. The coating is then suitably dried, and the ends or" the Wire having' been disengaged the .vire is then stretched in order to slightly reduce its diameter and loosen the coating 2 of insuiation. in order to secure this result, it is preferable to use a Wire of lead or some similar non-resilient material or alloy. If it is desired to withdraw the coating in predetermined lengths, the coating can be niclred, as shown at 3 in Fig. l, and when it is attempted to remove the coating from the Wire it will break into lengths' at the nicks, as shown in Fig. 2. in any event the lengths of tubing 1an be cut to any definite length after they are removed from the Wire,

i am aware that tubular pieces have been made by applying' the material to a round supporting member on which the tube is formed and removing` it byturning the material back on itsei' and'pee'ling it ed', as a glove is removed from the hand; but the material which .if prefer to use in inalring these insulatingbushings-namely, cellulose acetate-is relatively inelastic unless specially compounded to obtain eiesticity and cannot Je removed from a round supporting member in this way.

ifi'vhadi ciaiin as new, and desire to secure by Letters `Fatent of the United States, is#- bushing, which consists in coating a wire with a suitable insulating' compound, stretching said wire to reduce its diameter, and then removing the coating of insuiating compound.

2. The method of making an insulatingbushing, .which consists in coating a wire of non-resiiient inateriai with an insulating compound, stretching wire to reduce its diameter and ico-sen the coating, and then 'removing said 4 v,

3.. The method oi' making an insulatingbushing which consists in coating a support a plurality of times in a bath ot a non-adherent celiuiose acetate, drying said coating, varying the reist-ive diameter of the support and coating at the surface et junction, and then removing the coating.

4. r)She method oi' making insulatingbushing which consists in lapplying to a wire a coating of non-udherent cellulose acetate in a liquid condition, stretching said wire to re duce its diameter and 5 then removing the coating in tubular forni from thevwire.

5. rIhe method of making; an insulatingtube consisting in building,` up on at support of non-resilient material having a smooth sur- 10 face a closely-littin5r coating oi' an insulating loosen the Coating)` and.

l compound which iS relatively inelastic when l hard, then varying the relative diameter of 1 the coating an@ support et the surface of Junel tion, and then removing the coating.

1n witness whereot` I have hereunto s et my 15 hand this 26th day of August,

CALLAN.

JOHN G.

Witnesses: i

DUGALD MCK. MGKILLOP, l JOHN J. WALKER.

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