US974296A

US974296A - Electric glow-lamp.

Info

Publication number: US974296A
Application number: US468000A
Authority: US
Inventors: Hermann Remane; Emil Gottschalk; Eugen Hurwitz
Original assignee: Auergesellschaft GmbH
Current assignee: Auergesellschaft GmbH
Priority date: 1907-07-18
Filing date: 1908-12-17
Publication date: 1910-11-01
Anticipated expiration: 1927-11-01

Description

11. REMANE, E. GOTT SGHALKa E. HURWITZ.

ELECTRIC GLOW'LAMP.

APPLICATION FILED DEO.1'I,1908.

Patntea Nov. 1, 1910.

011% Mm WMMW`-H/MM. um# nm M5 A NUN 40E MGG H av, 1.68. n f

` WITNESSES /wmw Dw@ and escape from the surrounding fused serve to convey` the current. platinum supports has become so expensive .that a cheaper substitute 1s very desirable.

A UNITED sTArnsjATENT HERMANN REMANE, or BERLIN,` EMIL'GofrrscHALK, or cHAitLoT'rENBUnG, AND EUGEN HURWITZ, 0F BERLIN, GERMANY, AssrGNoRs 'ro DEUTSCHE kGAsefLU,HLICHT AKTIEN GESELLSCHAFT, -(AUERGESELLSCHAFT,) OF BERLIN, GERMANY, .A COR- PoEA'rIoN.

Original application Specication of Letters Patent.

' l ELECTRIC GLoW-LAMP.

Patented Nov. 1, 1910.

VTo all whom it may concern: K

Be 1t known that Ave, HERMANN. REIIANE, a resident ofv Berlin, Germany, EMIL Gorrscnami, a resident of Charlottenbnrfr, Germany, and EUGEN HUmvrrz, a' resident of Berlin, Germany, all three subjects of the Emperor of Germany, have invented certain new and useful Improvements in Electric Glow-Lamps, of which the following is a specification.

Our invention relates to electric glo-W lamps inv which the filamentis composed of tungsten. Great difficulty has been encountered in practice as regards the proper connection of the filaments with their supports,`

Whether or not` these supports themselves For this reason the use of nickel and also of vcopper has been tried, the support being melted by the use of an electric arc until 1t =the present case o a wire core a and a coatforms a globule atthe point at which it is desired to effect the connection with the filament end. l It has been found, however, that nickel is objectionable for the reason that it forms an alloy with the tungsten of the filament, which alloy is readily fusible and therefore causes areduction in the sectional area of the filament in the vicinity of the fused portion owing to the fusible alloy running down; the filament therefore breaks readily at these weakened places. If on 'the other hand copper is used, as a filament snpport, the filament is liable to break through globule before the latter has solidified.

In `our Letters Patent of thel Unitedv States No. 919,381 issued April Q1, 1909, l(of which the present case isa division) we have explained that Vthe defects referred to above can'. be avoided by usinga fila-v -vment support containing two metals, one A of which readlly forms an alloy wlth tunggroup) According to the specific embodiment of The use .of

ter `of the present application, We employ7 a filament supportv in whichy the two metals filed July 18,1907, Serial` No. 384.357. Divided and this 'applicationiled December 17,

1908.' Serial kNo. 468,000.

our invention which forms the subject mat? are united mechanically andnot alloyed;

for example, the filament support may consist of ,a nickel core coated with copper, or of a copper wire coated with nickel.

In the accompanying drawings `Figure l illustrates the connection of a tungsten filament Wit-l1 a support which is at the same. time a current lead or terminal; Fig. 2 shows the arrangement of two filament ends in a common fusion globule of the support; Fig. 3 is a cross-section of the improved support taken on line 3% of Figs. l and 2 drawn on an enlarged scale and Fig. 4 shows a complete incandescent electric lamp of the character herein referred to. Fig. 5 representsv a section through the `center of the globule B at right angles to the plane of The filament 'su port A or A consists in of a metal of the iron group and the other of a. metalof the copper group.` The metals of the former group have the property of readily formin alloys with tun sten, While the Vmetals of te latter grou not alloys with tungsten.v There ore, when (by the use lof the electric arc) a fused globule l such as B or B' is formed on said suport to receive the filament, the readily risible alloy formed Will effect a good connection between the lament and the support, while the metal of the copper group will preserve the solidity of the joint. In

other words, each of the metals ofthe support counteracts the injurious tendencies above explained which the other metal of the support exerts when used alone.

In- Fig. 1 we have shown the connection of a single filament with a support which ma be at the same time a current lead, as

1n igf. Y .y In t 1g. 2 We have shown a construction in which the same globule, B', receives the ends of two filaments C and C2 and in this case the support;- is not properly speaking a form current lead,a;k the current will pass directly 4. A n incandescent electric lamp,l comprising'a tungsten filament and a support' there- WoLDnMAn HAUPT.

from the filamentl C to the filament C2 for composed of a'core o 'one metal and a -throu h the globule'B. y coating of a .different etal one of saidv 35` In ig a indicates the v copper wire geren metals being nickel and t e other copper. 5 and b the nickel coating. The tungsten '5. The. combination offs. refractory metal filament isindicated as C. The allo of filament and a'sutpport therefor, composed of copper and nickel is indicated asd, an the distinct bodies o iferent metals7 of which intermediate layer as e, oney has the pr'o erty of forming an alloy 40 Instead of tungsten ywe -may use other wlth the materia of the ilament,'whi1e an- 10 metals of analogous properties. y other has the contrary proplerty.

We daim as 0111' invention; K v 6.--The' CCIIlbIlalOnVv Wit 8. I'eflaOtOly- 1. An incandescent electric lamp comprismetal filament of a metal support comprsing a tungsten filament and a support there- 1I 1 ja core and a coating -of ferent mate- 45 for, composed ofV twol separate' bodies of' rla `S connected wlth the filament by a fused metals connected mechanically, one. ofsaid- Joint, thezggmaterial 'of one of them 'being'- metals having the p'rtferty of forming an metal whlch alloys with the metal of the alloy with tungsten, w ile the other has the filament, and that of the other being metal contrary property. j whlch acts to protect the portion o'f the {ila- 50 2. An incandescent electric lamp comprisment adjacent to the joint from deterioraing atungstenfilament and a support thereltlon by sald first named metal. l

for, composed of a core of one metal and In testlmony whereofl we have hereunto of a coatmg of adierent metal, one of said set. 0.111' hands 1n the presence of two. submetals having the `pro erty of forming Aan Scribln witnesses. y 55 alloy with tungsten', w ile the other lhas the The oregoln specification silgned at Bercontrary property.` lin, Germany, t istwenty-eight day of Nol 3. An incandescent electric lamp comprisvember, 1908. ing a tungsten filament and a support there- HERMANN REMANE. for composed of a core of onemetal and a EMIL GOTTSCHALK. coating of a different metal, one of said EUGENHURWITZ. metals belon ing to the copper group and In presence of l the other to t e iron group. HENRY Heem,

i It is hereby certied that Letters Patent No. 374,296, granted November 1, 1910, upon the application ofv Hermann Reman, of Berlin, Emil Gottschalk, of Charlotten-l burg, and Eugen Hurwitz., ofl Berlin, Germany, for an improvement in Electric Glow-Lamps, were erroneously issued to Deutsche Gasglhlcht ktien Gesellschaft (Auergesellschaft), whereas ysaid Letters Patent should have been issuedv to General Electritgmfjllmy, a corporation-of 'New York, as owners by meen@ aaslz'gn.'k ments of said in vention, as shown by the. records of assignments in this cnice; and that the said Letters Patent shouldy be read with this correctionUthereinl that the same may conform to therecoid of the case inthe Patent Office.l i

y Signed and Vsealed lthis day of January, A. D., 1911. y

[sem] I nB. MOORE,

Commissioner of Patents.,

current lead,a;k the current will pass directly 4. A n incandescent electric lamp,l comprising'a tungsten filament and a support' there- WoLDnMAn HAUPT.

y Signed and Vsealed lthis day of January, A. D., 1911. y

[sem] I nB. MOORE,

Commissioner of Patents.,

It is hereby certified that Letters Patent No. 974,296, granted November 1, 1910, upon the application of Hermann Reman, of Berlin, Emil Gottschalk, of Charlottenburg, and Eugen Hurwitz, of Berlin, Germany, for an improvement in Electric G low-Lamps, were erroneously issued to. Deutsche Gasglhlicht Aktien Gesellschaft (Auergesellschaft), whereas said Letters Patent should have been issued to General Electraompany, a corporation. 0f New York, as owners by menne assignments of said invention, as shown by the records of assignments in this olice; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Otlce.

Signed and sealed this day of January, A. D., 1911.

[SEAL] E. B. Moonn,

Commissioner of Patents.