US1256567A - Incandescent lamp with concentrated metallic filament. - Google Patents

Description

H. J. JAEGER.

INCANDESCENT LAMP WITH CONCENTRATED METALLIC FILAMENT. APPLICATION FILED MAR. 16. 1915.

1 ,56'? 9 Patented Feb. 19, 1918.

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HERMAN J. JAEGER, 0F WEEHAWKEN, NEW JERSEY, ASSIGNOB T0 H. J. JAEGEE, COM- nnw JERSEY,

A COREORATION OF NEW J ERSEY.

ENCANDESCENT LAMP 'l/VITH. CONCENTEATED METALLIC FILAMEN'E.

Application filed March 16, 1915.

To all whom it may concern:

Be it known that l, HERMAN J. Janene, a citizen of the United States of America, and a resident of 'Weehawken, county of Hudson, State of New Jersey, have invented certain new and useful Improvements in Incandescent Lamps with Concentrated Metallic Filaments, of which the following is a specification.

This invention has reference to improvements in incandescent lamps with metallic filaments. The invention pertains particularly to lamps provided with concentrated metallic filaments as the incandescing and light emitting body. These concentrated filaments contain a relatively long incandescing wire in a rather small space, and therefore the light emitted from such filament also is concentrated and the size ot the bulky lamp globes may be reduced for economic reasons and shipping purposes.

The concentrated metallic filaments heretofore used were secured or attached with one end to one lead and with the other end to the other lead so as to have the single sections or filaments in series. However, between the leads a relatively large space remains empty in lamps of the described construction and therefore the light efiect is impaired in so far as these filaments are usually arranged in a portion of a circle. The empty space or portion of this circle does not emit light which is an undesirable feature.

In order to overcome the described defect l have produced incandescent lamps with concentrated metallic filaments wherein the said filaments "form an uninterrupted and complete light emitting body between the leads and in the preferred construction a complete circle or ring or approximately such circle or ring. Accordingly the light emitting surface is uninterrupted and in the case such surface being a ring or circle the appearance of the incandescent body is that of a glowing ball, especially in large lamps of standard voltage when the single sections or portions of such filament are bent up and down as is done in practice with certain lamps.

in order to have perfect electrical conditions in an all closed incandescent filament such filament is divided into two halves of Specification of Letters Eatent.

Patented Feb. 19, 11.918.

Serial No. 14,632.

even voltage, and two ends of such two halves are secured to one lead. and the two other ends to the other lead so that the current traverses each half of the filament independently. Should tor one reason or another, one half of the filament burn out, then the other half emits light because it is of the required voltage, and the lamp may be used the same way as former lamps which have an open space between the leads.

In order to render the invention entirely clear, reference is had to the accompanying drawing, in which:

lfigure 1 represents in elevation, partly broken away, an incandescent lamp with concentrated metallic filament closed all around and representing a lamp of low voltage,'such as used in automobiles.

Fig. 2 illustrates on an enlarged scale, in top plan View, such low voltage filaments and the tops of the two leads to which they are attached.

Fig. 3 shows in elevation, partly broken away, an incandescent lamp with two high voltage filaments, representing a lamp oi" standard voltage.

Fig. 4: illustrates in top plan view 'llament shown in Fig. 3 anchors and leads.

Similar characters of reference denote like parts in all the figures.

Ehe automobile lamp represent i l and 2 comprises the vacuun which may be of any suitable sl instance shown it is a globe or. support and a, d are the leads. e tinuations 0 d of the leads preferably" are fine tubes, and the ends of the concentrated semi-circular filaments e, f are placed therein, as shown in Fig. Q. The ends of the filaments are secured to the tubes by pressing the upper portion of each tube together. Each semi-circular filament e, f is of the same voltage so that the current traverses each independently and lights it up. The effect of the light however, is an uninterrupted circle and gives the impres sion of a glowing ball. It is evident that in small lamps, such as are used in automobiles and for battery purposes, no special sup ports or anchors are required because such short concentrated filaments are self porting.

with supports supe a u w The lamp of standard voltage illustrated 1n Figs. 3 and 4 comprises a vacuum chamber a of any suitable form, but generally the globular shape shown is preferred. The

leads 0 03 their continuations 0 d may be tubes or Wires, the latter then forming a small tube at the top. In order to bring the relatively long concentrated filament for a standard amp into a rather small space, same is of particular construction. Such filament requires the usual anchors and supports.

Centrally from the flat portion 6 of the stem 6 a wire or support 9 rises upwardly and carries a glass support it. The larger portion of this support consists. of a glass ring into which the anchor supports 2', j are fused. These supports carry anchors is, Z which rise to a considerable height and therefore are provided with the supports z, j. The glass ring further carries four wire anchors m, 12,-0, p. The incandescing body consists of two independent concentrated metallic filaments r, s. The ends of the filaments reach into the continuations 0 d of the leads and are secured therein by clamping them. In order to further reduce the space occupied by the two filaments the same are-bent up and down, as shown in Fig. 3. For the purpose of supporting the single sections of the filament the anchors herein described are provided, the higher anchors supporting the high bends of the, filament sections and the lower and shorter anchors the lower bends thereof. In order to allow of the expansion of the filament sections the higher supports form relatively large rings 70 Z while the top ends of the shorter anchors simply form hooks. For additional security of the lamp the glass ring of the support It may be provided with two small are of usual construction and wires t, u which are tied to the leads as shown in Fig. 3.

It is evident that in the large standard voltage lamps each half of the filament also is of the same voltage as the" other so that each semi-circular bent as described, becomes independently incandescent and one emits the same amount of light as the other. Each filament usually is made of 120 volts and according to the described arrangement each filament forms an entirely independent illuminant. The light effect of such a large lamp-of standard voltage of course is more pronounced relative to its appearance as a glowing ball than a small automobile lamp also for the, reason that each filament is bent up and down, as shown in Fig. 3. No empty space is left be tween the leads and the light emitting body is closed in itself the same as herein described with reference to the small low voltage lamps for automobile and battery purposes.

I claim as my invention:

A metallic filament lamp comprising a globe with an inner stem and two leads having their ends opposite each other, rod with top rim fused to the stem, rality of alternately long and short filament concentrated filament,

supports in said rim, and two semi-circularly arranged concentrated tungsten filaments alternately bent down and up to connect with the short and long supports and retaining the outlines of a circle.

Signed at New York, N. Y.', this 13th day of March, 1915.

HERMAN J. J AEGER.

Witnesses:

IDA E. ROLAND, ELEANORE HoFrMA'NN.

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