US905703A - Incandescent electric lamp. - Google Patents

Description

' H. J. JAEGER. INGANDESGENT ELECTRIC LAMP.

APPLIOATIOK FILED NOV. 4, 1907.

Patented Dec. 1, 1908.

I like in any ordinary multiple are UNIT D STATES PATENT OFFICE.

' HERMAN J. JAEGER, OF NEW YORK, N. Y

INCANDESCEH'T ELECTRIG LAME.

Specification of Letters Patent.

Patented Dec. 1, 1908.

Application filed November 4, 1%7. fierial'llo. 400,435.

To all whom it may concern:

Be it known that I, HERMAN J. Janeen, a

I citizen of the United States of America, and

the filament form one continuous single conuctor requiring but two leading-in 1wires am Such lo metallic filaments for mcandesceillt electric amps, for instance, the so called tungsten or Wolfram filament expands by the heat of the electric current when the lamp is lighted. Each loop of the filament accord ingly gets longer and at the same time softens to a certain degree. Therefore lam s con taining such filaments can not be urned safely except when the lamp hangs vertically downward with the base at the top and then there is danger of two neighboring loops coming in contact with each other whereby the filament burns out or one loop may touch the glass wallbreaking same and destroying the vacuum. In case lamps are mounted with the base at the bottom and thefilament at the to the danger of loosening the lamp is so mucli cater. For certain purposes it is desira le or necessary to mount lamps so that. the filament is in a horizontal position. Lamps of the ty e described cannot be used at all for suc purposes. In order to render it possible to use such lon tungsten or Wolfram filaments in lamps w ich are horizontally mounted r substantial support for the filament must be provided within the lamp. 'lhe usual an chors heretofore employed for supporting filaments will not answer for this purpose for economic reasons because too many of them would be necessary to support say, a four loop filament and such anchors are made of platinum wire which is very expensive.

My novel incandescent lamp which forms the subject matter of this invention over- .comes the described deficiencies as will be 7 fully explained further down in connection with the accompanying drawing in which rlcigure i represents in elevation an incandescent lamp embodying in'desirable form the present improvements. l i 2 illustrates in top plan view part of tle and the top portions of the loops of the'lilament, and big. 3 is a like view on line 3, 3 of bimilar letters of reference denote like parts in all the figures.

The present improvements may be applied to any kind or style of incandescent lamps. it is however preferred to embody the improvements in the so called well known tipless lamps.

In Fig. l of the drawing a represents the lamp globe or vacuum chamber which neces' sarily is of elongated or pear shape, 6 is the v stem scaled into the globe in the usual man her and carrying the conducting wires 0, d,

which are sealed into the top portion of the stem. To the solid top portion of the stem is fused a post or standard e consisting preferably of a thin glass rod; A disk of mice f is cemented to the lower portion ot the standand e having a multiple of small openings of even number near its circumference. Alike mica disk g is cemented to the top ortionof the standard c having a like multip e 'of'openings h, of even. number shown in Fig. 2 and support.

corresponding and coinciding with the opens mgs in'the mica disk). The standard .2 and the mica disks f and 9 form the support for the long filament, each loop passing through two neighboring openings h. Four loops are represented on the drawing and therefore eight openings must be in each mica disk. The lower ends of the filament loops '5 are cemented. in the openings of the lower disk f and the adjoining ends of two neighboring loops are connected by a short bridge j with the exception of one pair of such ends of two neighboring loops which pass through the disk f and are cemented to the ends of the platinum wires which are bent horizontally over and again upward to meet, the ends of the one pair of loops as shown at In the described manner one continuous long compound filament is formed out of the four loops and the current passing in through the one wire passes successively through the four loops and returns through the second Wire. The four loops are loosely passing through the openings inthe top disk g'allo\vcome incandescent. The short bridges 9' are I made of any suitable mater al such as pieces of carboniilament of sufficiently low reslstnear the stem leaving two such ends free 2 sea-"roe ing thus of linear expansion when they bestern and allowing of linear expansion, conducting bridges cemented each. to two ad oining ends of two neighboring loops on the disk which pass through said disk and connect ance or of platinum wire. The bridges y' bear one each with one of th leading-1n wires.

against the lower disk f and their ends are I practically cemented thereto in the place I where same are cemented to the loop ends as shown in hig. 3. 1 or the stem,

As above described the supporting disks f intervals to said standard having each a muland g are preferably made of mica. The 5 tiple of small openings of even number near disks are carefully freed from gases so that i the circumference which coincide with each they do not give up enough gas during the other, andalong metallic com ound filament burning of the lamp to injure. the filament a multiple of in said opening consisting 0 but this process does not form art of this loops cemented with their open ends in the invention. ,Any other non con ucting maopenings of the disk near the stem andallowterial which does not give up gases may he 2 ing of linear expansion, conducting bridges used in place of mica, for instance, very thin cemented each to two adjoining e ds oftwo lass plates but these are not so easily hen ineighb'oring loops on the disk near the stem led and.the openings made so conveniently. leaving two such ends free which pass through Two of the described disks areshown on the i said dish and connect one each with one of drawing but three or more may also be ens/k the leading-in wires;

' claim as new and desire to secure by Letters Patent:

- of loops in said openings cemented with their 3. in an incandeshentlsnnp of the ty pedeployed in lam s of considerable iength such as the so calle glass tube lamps. i, scribed a thin. glass rod, mica disks attached The'filament loops of tungsten orlwolfram. i at suitable intervals to said standard having supported by the described devices do not g each a multiple of'small openings of even sag, only linear expansion takes'place during number near the circumference which cointhe burning of the lamp and the natured life side with each other, and along metallic filaof the lamp is neither unpaired nor the his merit in said openings consisting of a multiple ment injured. of loops cemented with their open ends in th Having thus openings of the disk near ,he stem and allow ing of linear expansion, ,conducting bridges cemented each to two adjoining ends of two descrihed my invention 1 ll An incandescent electric lamp comprising a vacuum chamber with stem and leading-in wires, a thin long standard fused to the top ortion of the stem, insulating disks attached leaving-two such ends free which pass through said dish and connect one eaci with one of the leading-in wires.

Signed at New York, N. Y., this 2nd day of November, 1907.

HERMAN J. JAEGER.

at suitable intervals to said standard having each a multiple of small openings of even number near the circumference which coincide with c'ach other, and along metallic compound filament consisting of a multiple Witnesses Lunwre Kl. Bonn, Mouse Sim/nu.

open ends in the openings of the disk near the 2. In an incandescent electric lamp of the' neighboring loops, on the disk near the stem type described a stem with leading-in wires, which are tight in the openings of the disk f .i a thin long glass rod fused to the top portioniica disks, attached at suitable

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