US252391A - Electric lamp - Google Patents

Description

(N0 Model.)

"H. S. MAXIM.

vlILHG'RIC LAMP.

Patented Jan. 17,1882.

enabled to construct a better and more durajoints, and to their inner or smaller ends the suitable switch operating to'close or break the .forming a part thereot'.

. is furnished with a stopper, which fits tightlyl into the open neck. The stopper, which is of applied.

.iuclosing-globe, A, in which are several' car- UNITED STATES PATENT OEiEICEf HiEAiii s. MAXIM, or" BROOKLYN, NEW vonk.

ELECTRIC LAMP.

SPECIFICATION forming part of' Letters Patent No. 252,391, dated January 17, 1852,

Appncmim'i sied Myie, 1881. (No muriel.;

To all rwhom it may concern:

Be it known that I, HIRAM S. MAXIM, ot' Brooklyn, in the county of Kings and State of New York,have invented certain new and usei'ul Improvements in Electiic Lamps, of which the following is a specification, reference bcing had to the drawings accompanying and ln former applications tiled by me I have shown incandescent electric lamps composed of a transparent exhausted receiver surrounding one or more strips of carbon, which are included in the lelectric circuit by attachment tothe metal conductors introducing the current into thesaid receiver. One ofthe methods proposed by me for bringing these wires into the globe may be stated in general terms to consist in sealing or otherwise embeddingthe same in a plug or stopper, which tits the open neck of a glass globe bya ground joint. Over this method my present invention is designed as an improvement, inasmuch as by it I am ble lamp at a greatly reduced cost.

According to my present invention .the globe glass, is pierced at two or more points by slightly -tapering holes formed during the course of molding or by subsequent drilling. In the. holes are fitted steel plugs, of corresponding shape, and of such length that the ends project on either side of the stopper. The plugs are fitted to the glass by ground supportingconductors are attached, while the outer ends serve as circuit-connections for a circuit through the lamp. l The accompanying drawings are referred to for au understanding of the invention.

Figures lv and 2 represent in central vertical section lamps to which my'inventiou is Similar letters in both gures refer to'corresponding parts.

The lamp illustrated in Fig. l consists-ot' an bons, D D, whose ends are united to the sanne mass of conducting material, D. Into the open mouth ofthe globe A is fitted,"by grind ing, a stopper, B', of glass or equivalent material. Through the stopper are formed many conical perlorations as the numberot' carbon conductors requires, and into these the steel plugs E are iitted by grinding, so that the joints formed shall be perfectly air-tight. To the smaller ends ot' the plugs the conductors, of platinum or copper, C Uf, are attached in any way to secure a good electrical contact. vIn the. present instance they are screwed into threaded holes in the ends of the plugs. To the conductors C U the carbons D D are clamped, theirfree ends being-united to a small block of carbon or metal, D', from which a conductor, G, leads tov one ot' the steel plugs. From the shape of the plugs and the manner iu which they are fitted to the stopper it followsthat as the air isexhausted from the globe in the usual way the atmospheric pressure tends to draw them in the tighter. As an additional precaution the spaces about the projecting ends of the plugs on the outside of the stopper are filled in with cement, wax, or a similar substance.

The projecting ends of the steel plugs may be utilized as circuit-connections in conjunction with any suitable circuit-maker or switch, and it is evident from the number and disposition of the plugs and conductors attached thereto that one, all, or any desired portion of the conductors, may be rendered incandescent at a time by making the proper connections. The apparatus which l design using for accomplishin g this purpose is not illustrated herein, asl intend making a separate application there for.

The ground steel plugs as a means of conveying the current through a stopper into an air-tight lamp-globe, though described in connection with a lamp of peculiar kind, are applicable to anyforin of lampin which the globe inclosing the light-giving part is closed by a plug or stopper 'of vitreous material, and this I have illustrated in Fig. 2, where the lamp is shown as containing a'single and coutiiiuous conductor with two plugs, the arrangement being substantially that of the ordinary forms of lamp now in use; nor is it essential to this part of my invention in what manner the carbons or their supporting-conductors are connected with the steel plugs, nor by what means the circuit is complet ed from the line-Wires io the steel plugs, as it is obviously possible to vary the construction of the lamp in these particulars almost indefinitely.

Having now described my invention, what I claim is 1. The combination, in an electricla-mp, of a transparent globe surrounding the source of light and an airtight non-conducting plug or stopper closing the same and containing two vor more conical steel Wires or plugs ground into perforations through the material of which said stopper is composed, and in electrical connection with the carbon conductors, as described.

2. The combination, with the transparentglobe of an incandesc nt electric lamp, of a glass stopper fitting the same by a ground joint and containing two or more conical steel wires or pl ugs ground into and passing through correspondingly-shaped perforations in the said stopper and suitably connected to the supportingconductors of the carbon strip, as described.

In testimony whereof I lmvehereuntoafixed my signature this 10th day of May, 1881.

HIRAM S. MAXIM.

WVitnesses W. M. ALLMRE,

PARKER W. PAGE.

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