US1734809A

US1734809A - Leading-in conductor

Info

Publication number: US1734809A
Application number: US638931A
Authority: US
Inventors: Holst Gilles; Bergmans Jan; Bol Cornelis
Original assignee: Philips Gloeilampenfabrieken NV
Current assignee: Koninklijke Philips NV
Priority date: 1922-05-27
Filing date: 1923-05-14
Publication date: 1929-11-05
Anticipated expiration: 1946-11-05
Also published as: AT101830B; FR556438A; DE496041C; GB198322A; CH104436A

Description

Nov. 5,-1929. G, HoLs-r E1' AL 'LEADING-IN CONDUCTOR 'Filed may 14, 192s z-sneetssneet '1- ...llrfury//Jifl/ j of the patented Nov. 5, 1929 UNITED sTATl-:s

-Parietti, orificlzjx GILLES HoLsT, .uN EEEGMANS, AND CORNELIS Bor., or EINDHOVEN, THE NETHER- LANDs, AssIGNons rro NmurnoosE vENNoo'rscinirA rnrnrrs GLoEmAnrEN- EADEIEKEN, or EINDHOVEN, THE NETHERLANDS LEADING-IN CONDUCTOR Appuenuon many 14, 192s, serial No. 638,931, ami in the 'Netherlands nay 27, l1922.

The present invention relates to leading-inl conductors and more particularly to electric conductors which are hermetically sealed in l cially suitable for conducting relatively heavy electric currents.

According to the present invention a `disc is fused into the glass vessel, which' disc con sists of a metallic material which on fusing in does not generate gases and has a coeiicientof expansion which is little different from that of the vitreous material into which it is to be sealed, a conductor being tixed to said disc. v The invention is especial-ly adapted for use in connection with discs composed of a metallic'material which will be vwetv by -the` rsurrounding vitreous material. Still more particularly the invention is adapted for usl ing chrome-iron of such composition that its coefficient of expansion differs little from that glass. f

In the case that the vessel partly consists of a `tubular member of vitreous material, the disc is preferably fused into the wall of said tubular member at a short distance from its end.

The leading-in conductors `may be led through the discs but preferably they4 are fixed on each side of the discs. In the case the discsconsist of chrome-iron itis desirable to choose nickel for the portions of the conductors fused to the discs.

According to another featureof the inven- 40 tion a plurality of. discs is hermetically connected together along at least a portion of their circumferences by meansU of a layerI of vitreous material, thereby forming a disc of larger dimensions, said disc being fused into the vitreous wall ofthe vessel at` its circumference and a conductor being fixed to each of the discs.4

The discsare preferably sector-sha ed so that `they form togethera circular isc of larger dimension The present invention relates also to a y.method for sealing in the discs into a wall of vitreous material. This method is characterized in first applying a thin layer of vitreous material around the circumference of said disc and then sealing the disc with -saidglass layer into the wall of' vitreous material.

In the accompanying drawing some embodiments of the invention are diagrammatically` illustrated. y

Figure l shows a leading-in conductor having the features according tothe present in,

vention with a surrounding glass tube.,

In Figure 2 an arrangement according to the invention applied to an electric arc lamp provided with tungsten electrodes 'is illustrated.v

-In Figure 3 is shown a lamp provided with two leading-in Wires, which have been hermetically sealed. l v` e Figure 4 shows the top-view of the stem inl a lamp according-to Figure 3, the ,polewires, having been cut at a short distance above the stem. n -f` Figure 5 shows a top-view of an arrangement with four leading-in wires, and

Figure 6 shows a lamp in which the discs Y are fused directly into the, neck of thebulb.

Figure 1 shows a glass tube l, a disc2 and leading-in wires 3 and 4. The leadiiigin wires may be constructed of any `suitable material o good conductivity, e.l g. of copper..

are obtained with chrome-iron offa suitable composition.

The inventors have also recognized thatv the discs need not be very thin.. When using chrome-iron, discs of 1-2 millimeters thickness may be fused in without -any inconvenience, which has not been thought possible hitherto.

The composition depends on the nature of up to. are allowable. ln a particular v case, in which, the coe'icient of expansion of the chrome-iron was about 10% higher than that of the glass, the results' were nevertheless quite favourable. llt will be clear how- Jever that the smaller the diderence between the coeficients of expansion, the better is the result obtained.,

MThe leading-in wires may be Xed to the dises in various ways.. Theymay be le'd through the discs and xed to the discs by soldering, welding or in any other way. However, in doing so there is a risk of formv ing air-leaks at the place ofintroduction and it is therefore preferable to fix the leading-in wires at both sides to the. discs for instance by soldering or weldin If chrome-iron discs are used, it is pre rable to construct the portions, fixed to the discs, of nickel. For this metal welding is a good and easy way of iXing the same to chrome-iron.

Referring again to Figure 1, one of the leading-in wires (3) which serves to X the electrodes or the incandescent body, maybe stiff and preferably consists wholly or at least as to the portion xed to the isc, of nickel. The other leading-in wire (4) is preferably made flexible and may consist ofv twisted copper wire.

As it is rather difficult however to ix copper to chrome-iron, it is preferable to first apply a nickel current-leadalso at this side of the disc and to fix the copper wire thereto, e. g. by soldering.

En Figure 2 an electric arc-lamp with tungn sten electrodes is shown, provided with leading-in conductors.

The glass bulb 6 contains the glass/stem which ends in the tubes 8 and 9, into which the discs 10 and 11 are fused. The discs support on one

side conductors

12 and 13 with the tungsten electrodes and on the other side the leading-in wires 1d and 15.`

The lamp shown in Figures 3 and 4 has a bulb 16, into which the stem 17 is fused. Two crescent-

shaped discs

18 and 19 are fused into this stem 17 whilst leading-in '

Wires

20, 21, 22 and 23 are fixed on each side of the discs.

The dises may be shaped into any form desired. Preferably care should be taken that the discs can be fused together with a relav tively narrow glass layer between them, whilst the free part of the circumference of at least one of the discs is then fused into the wall of the glass vessel.` One or more discs may also be connected with the other disc (discs) along the whole of their circumference. For instance a circular and an annular discq can be connected by means of an intermediate annular glass layer, and then the external circumference of the annular disc, with the glass wall can be fused together.

Although it is not necessary, 4'the most simple course is to use flat discs, which are fused together into one larger flat disc..

Furthermore the shape of the discs depends on the shape of the glass vessel at the place of fusing. lf several wires are fused into a tubular part with'circular section, the most simple shape for the discs is the sectorl of a circle, whereas in the case of two leadu ing-in wires the crescent shape is more convenient.

ln some cases it may be desirable to introu Referring to Figure 3 thepole wires 20 and 21 supporting the incandescent iilament consist preferably of nickel, whilst also the Wire-

portions

22 and 23 are of nickel. The

flexible wires 31 and 32, which consist of copper, may be fixed to the nickel by l'soldering or welding. p

When manufacturing the device, the discs are preferably first connected together by a glass layer and then the aggregate obtained is fused into the glass wall for example into a tube.

The fusing is assisted by first surrounding the external circumference of the discs by a thin glass layer.

Figure 6 represents an embodiment of the invention in which the discs, with the leading-in wires fixed to them, are directly fused to the neck 29 of the bulb 30.

This is the most simple emebodiment of the invention. l/Vhen constructing the device according to Fig. 3 there is one step more to be performed than in the case with the device shown in Figure 6 viz, the fusing of the stem into the bulb.

The present invention may be applied to electric glow lamps and all kinds of discharge tubes such as rectitiers, generating tubes or receiving tubes, gasfilled glowlamps, vapour lamps or the like. It is particularly advantageous in cases where no good results can be obtained with leading-in wires of platinum, nickel-iron or nickel-iron with copper-coating, as generally used; particularly in the case of heavy currents of e. g. more than amperes.

, What we claim is :l

l. The `combination of a vessel having at least a portion of its Wall consisting of a vitreous material, a disc consisting of chromeiron having a coefficient of expansion which is little different from that of the said vitreous material, said disc being hermetically fused at its circumference into said vitreous Wall and forming a part thereof, and two conductors fixed each to one side of said disc and consisting of nickel at those portions which are fixed to the chrome-iron disc.

2. The combination of a vessel having at least a portion of its Wall consisting of vitreous material, a plurality of dises consisting of a metallic material which on fusing-indoes not generate gases and the coefficient of expansion of Which is little different from that of said vitreous material, saiddiscs being hermetically connected together along at `least a portion of their circumferences by means of a layer of vitreous material,

- thereby forming together a disc of larger dimensions, said disc of largerdimensions being fused into said vitreous vvall of said vessel and conductors fixed to said discs.

3. The combination of a vessel partly con-v sisting of a tubular member of vitreous material, a plurality of discs consisting of a metallic material Whichon fusing-in does not "generate gases and `thevcoeflic1ent of expansion of which is little different from that of said vitreous material, said discs being her- -metically connected together along at least a portion of their circumference. by means of a layer of vitreous material, thereby forming together avdisc of larger dimensions, said disc of larger dimensions being fused into the Wall of said tubular member at a short distance of the end and conductors fixed to said discs. v

4. The combination of a vessel having at least a portion of its Wall consisting of vitreous material a plurality of sector-shaped Adiscs consisting of a metallic material which on fusing-in does not generate gases and the coefficient of, expansion of Which is little different from that of the vitreous material said discs being hermetically connected .t0- gether along a portion of'their circumference by meansof a layer of vitreous material thereby forming a disc of larger dimensions,

l. said latter disc being hermetically sealed at layer of. vitreous material, thereby forming together a disc of larger dimensions, said disc of larger dimensions being fused into said vitreous Wall of said vessel, and conduetors fixed to said dises.

6. The combination of a vessel having at least a portion of its Wall consisting of vitre-` ous material a plurality of discs consisting of chrome-iron containing more than 10% 75v and less than 50% of chromium, said discs being hermetically connected together along at least a portion of their circumference by means of a layer of vitreous material, thereby forming together a disc of larger dimen- 8'0 sions, said disc of larger dimensions being fused into said vitreous Wall of said vessel and conductors fixed to said discs.

7 The combination of a vessel having at' least a portion of its Wall consisting of Vitre- 85 ous material a plurality of discs consisting of chrome-iron having a coefficient of eX- pansion which differs little lfrom that of said vitreous material, said discs being hermetically connected together along atleast a portion of their circumference by means of a layer of vitreous material, thereby formin together a disc of larger dimensionssai dise of larger dimensions being fused .into i said vitreous Wall of said vessel, and conductors fixed to each side of said discs' and consisting of nickel at those portions which are connected to said chrome-iron dises.-

In testimony whereof Wel affix our signa-.

tures. l

` 'Dm GILLES HULST.

JAN BERGrlSIAN-S.v CORNELIS BOL.