US255363A - Edward weston - Google Patents

Description

(No Model.)

E. WESTON.

ELECTRIC LAMP.

No. 255.363. Patented Mer. 21,1882.

N. PETERS. PhalLnnognpmr, wamingwn. D, c.

UNITED STATES PATENT ErreaO EDIVAED VESTON, OF NEWARK, NEW JERSEY, ASSIGNOR "lO THE UNITED STATES ELECTRIC LIGHTING COMPANY, OF NEW YORK, N. Y.

ELECTRIC LAMP.-

SPECIFICATION forming part of Letters latent No. 255,363, dated March 21, 1882.

Application filed August 10. 1881. (No model.)

To all whom it may concern: prefer to make it in the form of a shallow cup,

Beit known that I, EDWARD lVESToN, of the thickness of the. sides being the same as Newark, in' the county of Essex and State of that ofthe main portion. In the bottom ofthe New Jersey, have invented certain new and base two or more tubes of glass are set by the useful Improvements in Electric Lamps, ot' ordinary method of welding, extending either 55 which I declare the following to be a full, clear. above or below or on both sides ot' the cup, and and exact description,reference being made to through these tubes Ipass shortlengthsot wire the drawings accompanying and forming a ot' any good conducting metal and ofa diameter part ot' the specification. as nearly as possible equal to that of the inte- 1o My invention pertains to the manufacture of rior ot' the tubes. To bridge over this air-space 6o electric lamps wherein a conducting-strip of between the wires and the glass,a.nd thus form carbon orsimilarrefractory substance attached a perfectly air-tight seal for the wires, I coat to metallic supporting-conductors is hermetithe tubes on and near the ends projecting from cally sealed within an exhausted globe or re one side ofthe base with a thin lm of metal.

I5 ceiver; and it relates particularly to a novel rlhisisapplied both to the glass and to thewires 65 method ot' sealing into the lamp the said supwhere they leave the glass, so that the two are porting-conductors,thatis distinguished from united by a delicate condacting-surface. A conthe methods heretofore resorted to for aecomvement way of forming this coating is to applishing this object hy its greater simplicity ply by a brush a mixture of chloride of platiand etfect'iveness. num and oilol" lavender to the adjucent surfaces 7o Previously to my invention the sealing in of ot the glass and the wires, and then to apply the conductors has been eli'ected in avarietyof heat thereto until only the tilm of platinum reways, the best known and most important of mains. This is then exposed to a high temperwhich are in substance as follows: rlhe wires ature until it is fused into the surface ot' the 5 are passed through air-tight glands in a metal glass,\vhen the wholeis immersed in an elcctro- 75 cap, which is then secured to the open end of platingbath anda coatingofcopperot'sufficient a transparent receiver, or theyare embedded or thickness to insure aperfectly air-tightand dusealed directly into a mass of glass, which is rable seal deposited thereon. To the free ends united by the application ot' heat to the globe. ofthe wires projecting up from the concave surrlheconditionsofastablevacuum-an essential face ot' the base the carbon is then attached 8o featurein thelainps asnowmadeare probably and the base joined to the lamp in the usual neverreachedintheformercase,whileinthelatmanner, after which the globe is exhausted. ter they have been attained only by the highest ln the accoltipanyingdrawings I have shown degree ofskilled workmanship andthe employin section portions ot" lamps ot' slightly-ditt'ermentot'a metal-such as platin um-which posent character embodying my invention. 85 sesses approximately the same coefficient ot' In Figure 1 the globe A. is closed by a base, expansion under high temperatures as glass. B, to which the tubes C C are tixed by being Thesetlitlicultiesare notencountered inthe conwelded into apertures formed therefor in the struction of the lam p made according to my inusual way. Through the tubes C C metal con- 4o vention,in pursuanceofwhich l form alamp in ductors l) D are passed, their ends being Iiat- 9c two separate parts,one constituting the inclostened slightly, as shown at dd, for thepnrpose ing globe or receiver, the other a sealing-base of forming convenientcontact-surfaces. In this o and supportfor the conductors and carbon. The ease the tubes project only from the bottom of former is of any desired shape,and has an open the base outside the lamp, and the coatings of neck, through which the carbon conductor, metal are applied thereto in the manner above g5 when mounted, is inserted, and which is then described, E E designating the coatings. An closed by welding to its rim the base. The advantage of this lorm is that the ends of the character of this latter, with certain restrictubes, with their coatings ot' metal, may be tions, may be indefinitely varied. A simple used as the terminals of the lamp, and thccon- 5o disk of rather thick glass may be used; butI nections from the linemade directly therewith. roo

In Fig. 2 the position of the tubes is reversed, in this case they being attached to the base so as to extend up into the globe. Here the sealing` is effected in the same way, but is entirely within the globe. Still another form would be to extend the tubes on both sides of the base, as is shown in Fig. 3, in which case the seal may be applied at either or both ends, as may be desired, and in fact a great number of modications are possible, all of which follow directly from the above and differ in no essential particulars from them.

ln the preceding glass is mentioned as the material composing the sealing-tubes. It will, however, be found advisable in most instances to use a glass which contaiusin its composition a largerproportionometal-such as theoXides of iron and copper-than is usual, for I have found that the metal coating more readily adheres to this than to ordinary glass. Se, too, instead of platinum, other metals may be used for the conducting-coating, such metals being gold, silver, iridinm,and in general any metal that can be applied to glass in a similar manner to the above and which will not seriously oxidize under the heat necessary to 'fuse it into the surface ofthe glass.

In forming" the preliminary metallic film itis sat'er to apply several coatings,yowing to the extreme thinness of the film remaining after the application of heat, and it is particularly to be observed that the film thus formed must beincorporated with the glass, and for this reason it must be exposed to a temperature sufficiently high to t'use it into the surface 0f the glass. Otherwise it is almost certain to peel ol the instant it is placed in the elcctroplat ing' bath.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, without reference to the specific character of the lamps to which the invention may be applied, is-

l. lhe method of sealing.,r metallic conduct ors in glass, which consists in forming` between the said conductors and the glass a iilni or coating of conducting metal, fusing the same into the surface ot` the glass, and then forming a coating of metal thereon b v electro-deposition, substantially as set forth.

2. The combination, in an electric lamp, of tubes or projections welded to the glass formingthe globe, with metallic conductors passing,` through and united to the said tubes by impervious films or coatings of metal incorporated with the glass, substantially such as described.

8. The combination, in an electric lamp, ot' tubes or projections welded to the glass forniing the globe, with metallic conductors passing through and sealed into the said tubes by connecting films ot' conducting` material covered and strengthened by a coating ot' metal electro-deposited thereon, substantially as set forth.

In testimony Whereot'I have hereunto set my hand this 6th day of August, lSSl.

EDWARD \VESTON.

Witnesses:

PARKER W. PAGE, OLAY'roN KNEELAND.

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