US1306912A

US1306912A - Electric lamp

Info

Publication number: US1306912A
Authority: US
Publication date: 1919-06-17
Anticipated expiration: 1936-06-17

Description

FREDERICK G. KEYES, OF HOBOKEN, NEW' JERSEY, .ASSIGNOR T0 COOPER HEWITT ELECTRIC COMPANY, 0F HOBOKEN, NEW JERSEY, A CORPORATION OF NEW TER- SEY.

Specification of Letters Patent.

ELECTRIC LAMP.

Patented lune 1W, 11919.

Original application filed January 8, 1914, Serial No. 811,003. Divided and this application filed April 2, i

" 1915. Serial No. 18,674.

To all whom t may concern:

Beit known that I, FREDERICK G. KEYES, a citizen of the United States, and resident of Hoboken, county of Hudson, State of New Jersey, have invented certain new and useful Improvements in Electric Lamps, of which the following is a specification.

The present invention relates to improvements in tungsten lamps, more particularly lamps of that class having high candle power. lamps is a tungsten filament of considerably larger diameter than is now customarily ing the capacity indicated above, that is to used for the filaments of constant potential tungsten lamps, the same bein connected with heavy iron lead wires. ith the arrangement thus described the potential of tungsten lamps may be considerablv reduced,

while the current carrying capacity thereof, is correspondingly increased. The result isf.

that with the same expenditure of electrical energy a lamp having far less fragility than usualis provided and by reason of the lower applied potential, the lamp operates within a less limited sphere .and escapes certain of the limitations imposed by the usual commercial supply voltages.

In the commercial forms of filament lamp now in use, the largest value of the current is about 2.5 amperes. In the metal lament lamps here represented, a current of over eighteen amperes may be utilized. In speaking hereinafter of heavy filaments or filaments of considerable diameter, the intention is to make such Aterms apply to filaments havsay, capable of carrying current of above eighteen amp'eres. l

Whatever attempts have been made heretofore to produce lamps having the characteristics of the lampherein described have been defeated by the failure of the seals which, in the usual form, are unable to sustain currents of the indicated magnitude for more than a brief period. l

Another feature of the lamp resides in the mode of securing the proper sealing of the lead wires and of the anchors which support the tungsten filament which in the present invention usually appears in the form of a spiral. i

lSpecial means are also provided for mak- Q ing stable connections between theisnds of the tungsten spiral and the iron leads and The central feature of these novel' other details are present which will be described in due course in the present specifica-1 tion.

My invention is illustrated in the accorritungsten spiral; Fig. 3 is a detail, also mainly in section, of the connection between an end of the tungsten spiral and one of the inner leads; and Fig. 4 is a bottom view of the filament.

In thedrawings, lis a globe for one of myJ lamps and '2 is a tungsten' lament, here shown 1n the form of a spiral, located approximately at the center of the globe 1. The iilament is attached at its ends to lead

wires

3, 3, of copper sheathed with iron, the

copper being utilized for its good 'conducting qualities and the iron being employed for its stilfness or rigidity to prevent the bending or distortion of the copper wire under the infiuence .of the high temperature developed within the globe. i

In Fig. 2 the copper conductor is shown at 20, land the iron sheathing-at 3. Iron anchor rods are shown at 4, 4, the v same being provided with tip portions 5, 5, of tung- `sten wire which are sealed t`o the iron rods within a tubular extension, 7, of the'globe l and being arranged just above `a shoulder, 8, near the bottom of said extension. The object of the diaphragm 6 is to shut ofl from the tubular extension and from the lamp seals, presently to be described, near the upper end of said extension, all unnecessary heat. The diaphragm 6 does not necessarily .-5

leads 9, 9, which form mechanically a part of the seals of the lamp. The rods, 9, 9, pass through platinum tubes 10, constituting the main conducting portion of the lamp seals. On the outer ends of the tubes 10, 10, are placed iron caps 11, 11, which are Ywelded to the tubes 10, 10 and the rods 9, 9, by means of an Oxy-acetylene ame. 'Ihe external leads may be copper wires 13, 13, fused or soldered to the caps 11, 11, as shown. 1'0 `It will be obserted that the seals are made within a rentrant portion of the extension 7, `whereby the danger of fracture .from Inechanical causes is reduced. The tubes 10, 10,.A are sealed within the said rentrant, portiens. The entire interior of the lamp is "liu'sisealed off from exposure to the external air `and a structure is provided which will admit of the safe and continuous application thereto of currents above eighteen amperes. In this way lainps of exceedingly high candle power are obtainable without unduly shortening the life of the lamps.

The mode of connection between one of the inner leads 3, and the aluminum disk 6 2t is illustrated in Fig. 2. An ope-ning be ing made in the diaphragm at the proper point the tube of copper and iron, surrounded by a tube 14k of quartz is passed through the diaphragm and the entire inner '30 space is then packed with a suitable cement, 15, such as might be formed by the mixture of ground silica and sodium silicate. This preventsthe contact of the inner leads with the aluminum disk and thus obviates the 95 danger of short circuiting between said leads. By similar construction the anchor rods 4 are supported in the disk and insud lated therefrom and from the inner leads 40 ,At the inner terminals of-the

leads

3, 3, the iron coverings are attached to or formed into

cups

16, 16, into which the ends of the tungsten spiral extend and within which they are attached to the said cups or welded thereto so as to form-good electrical connection therewith. As a means for joining the heavy copper leads 9, 9, to the

inner leads

3, 3, through the medium of the

sockets

12, 12, I may make use of any suitable sort of juncture.`

For example, I may extend ,the lower ends of the leads 9, 9, down into the

socket

12, 12, and hold them there by means of set screws 17,17.

This application is a division of my application Serial Number 811,003, filed January 3th, 1914,.

I claim as my invention: 1. In an electric device, a container, a

conductor located within the container, leads connected with the terminals of the conductor and sealed in the wall of the container, and means independent of the seals filament.

for carrying the Weight of the conductor, said means consisting of a diaphragm c5 mounted in said container and anchor rods extending therefrom and connected to said conductor.

2. In an electric device, a container, a concentrated filament of conducting material located within the container, leads connected with the terminals of the filament and sealed in the wall of the container, and means independent of the seals for carrying the vweight of the filament, said means con- 7a sisting-of a diaphragm mounted in said container and anchor rods extending therefrom and connected to said filament.

3. In a tungsten lamp, a` container, a filament of tungsten located within the container, leads connected with the terminals of the filament and sealed in the wall of the container, and means independent of the seals for carrying the weight of the filament, said means consisting of a diaphragm mounted in said container and anchor rods extending therefrom and connected to said filament. Y

4. In anelectric device. a container, a filament of conducting material located within 99 the container, tubular seals connected with the terminals of the filament and sealed in the wall of the container, and means indei pendent of the seals for carrying ,the weight of the filament, said means consisting of a diaphragm mounted in said container and anchor rods extending therefrom and connected to said filament.

5. In a tungsten lamp, a container, a fila ment of tungsten located Within the container, tubular seals connected with the terminals of the filament and sealed in the wall of the container andmeans .independent of the seals for carrying the weight of the filament, said means consisting of a diaphragm 105 mounted in said container and anchor rods extending therefrom and connected to said extending therefrom and connected to the filament.

Signed at New York in the county of `New York and State of New York this 31st day 1'20 of March, A. D.. 1915.

FREDERICK G. KEYES.

VitnesSeS:

, IVM. H. CAPEL,

HAROLD B. VVooDwARD.