US1765957A - Photographer's twin-arc lamp - Google Patents

Description

June 24, T930. wEsTPHALN 1,765,957

PHOTOGRAPHERS TWIN ARC LAMP Filed Novf, 1928 2 Sheets-Sheet l figg? June 24, 1930. L, WESTPHALEN ,765,957

PHOTOGRAPHERS TWIN ARC LAMP Filed Nov. 30, 1928 2 Sheets-Sheet 2 Ihre for y @ZM Patented kJune 24, 1930 UNITED STATES PATENT OFFICE i LEONARD WESTPHALEN, OF CHICAGO, ILLINOIS PHOTOGRAPHERS TWIN -ARC LAMP vy Application filed November 30, 1928. Serial No. 322,788.

` pactly into'the casingwhen the lamp is not V1n use; and'aims to provide simple and easily released connections whereby certain ofthe vwings interlock when in use, so that the wings will form a rigid four-winged p 2o reflector ldisposed in effective position with respect to the sourceof light.

' Furthermore, my invention aims to pro- Avide a lamp with two cooperating reflectors, one of which is readily foldable, and aims to provide simple means for holding the other reflectorin fixed disposition.

In still another aspect, my invention aims to provide simple means for controlling the clutches'in a twin-carbon arc lamp through aV slidable control rod, and for insulating boththe control rod and the rod-retracting yspring from the Vcasing of the lamp. Still further and also moredetailed objectswill 'appear from the following specification kand ffromthe accompanyingdrawings,

vinvvhich. s

Fig. 1 :is a front elevationof a twin-'carbon arc lamp embodying :my invention, with the reflector wings openedfout and interlocked .40 as they appear when the lamp is inuse.

v F1g '271s va horizontal section, taken along the line2-2 of Fig. 1. v f Fig. is a front4 elevation, drawn on a smallerscale than Fig. 1 and showing the i 'reflectorwings in their folded positions.

Y '.Fig. '4 is a fragmentary horizontal section taken along the line of Fig. 3, but drawn ona larger scale.Y c n' Figi `5 is a front elevation, drawn on the same scaleas Fig. 1,:showing one pair of reflector wings extended while the other is folded ready to be swung into the casing7 a portion of one Wing of the latter pair being broken away.

Fig. 6 is a perspective view Vshowing the 55 Aend portions of two adjacent reflector wings which are arranged for'releasably interlocking with each other.

Fig. 7 is an enlarged and fragmentary section transverse of the casing, showing an 6o alternative arrangement of the carbon-feeding mechanism.

In the illustratedembodiment, the rectangular box-like casing of my lamp is a forwardly -open casing having sides 1, a`

-top 2 and a bottom 3 extending forwardly from the back t ofthe casing, this casing being supported from its sides by a swiveling stirrup 5 mounted onl theriser 6 ofV a stand. Extending across the casing parallel to its back is an insulating plate 7 which Vsupports the usual resistance coils 8 in the 4space behind it, this space being ventilated by apertures 9 in the casing. Fastened to the vertical insulating plate 7 are two for- 75 wardly extending brackets 10, each of which carries a clamp 11 for supporting one of the lower (and normally stationary) carbons 12;

Vwhile a horizontal insulating plate 13 rests A on the bottom 3 of the casing and extends 80 below the carbon clamps 11 and the carbons 12 to prevent these carbons from being slid down against the bottom of the casing.

Each of the upper carbons 14 extends slidably through a vertical sleeve 15 depending 35 from a horizontal bar 16 which is supportedy from the vertical insulating plate 7 by two brackets 18. The bar also carries two riser stems'19, each of which hasa stop ring 2O fastened to it at some distance above the bar L16. e, i

For starting the arcs, I provide a. control rod 21 extending slidably through the bottom insulating vplate 18 and the bar 16, a rocker bar. 22 pivoted at its middle to the upper end of the rod `21 and a-link 23 de,- pending fromeach end Vofthe rocker bar. Each linkv 23 extends downwardly through the inner yend portion of a clutch bar 24 .meer ne 1 such length that itpyyi11-n9rma11y-raisephe rod 21 to a position in which each clutchl bar 24 tilts upward toward the rod f 21, thereby causing each up r carbon to be lifted by the grip of, the c ch Ybar through which it extends.

W'hen the tips of the carbone have been v consumed suciently to rupture the arc (or ,at least to lengthen either one of the arcs unduly), the user pulls the control rod 21 iewrbagiinstthe u1 f h 1 h c y oosemng' e grip o eac c utc baron the carbon- 14 which extends through that bar. Each upper carbon then slides down by gravity against the tip Aof .the lower carbon, after which the downward pull on they handle 26 offthe control rod is released, Y

thereby permitti this rid and provi e new acings' :between each :verti-v cally'alined pasrii.'ofcarbons-` Therbottom' of thecasing has a perorationconsiderably 'larger than the diameter ofthe rod 21, 'so that# the letter is out of contact with `the casing and hence does not electrically conneet-the casing with theupper carbons.

i'To project the light of the vtwo arcs effecthe spring both Y V`t1vely, I employ two reflectingmeans, one of which is'a stationary reiiector 27 iormeda proximately. as a portion of an upright tube having its axs considerably forward'of both n rcs. `This curved reector 27 vmay =be a simple curved metal sheet, fof' ed vso that when its .back len ng insulating gages the vertice plate, the side edges ofthe snap c respectively behindthe hinging portions of g the sidevwings 28 and29 ofthe wider mountedfolding refctorand these-side edges of 1 the rellector press laterally against` the inner 50 vfaces-of the side walls 1 of thecasing,

Each of the four wings thefoldinl'pnd e a forwardly ,ila-ring' l'silectorl is shaped fruetrum oiga ltri le, andftle 'twoleide punge 28 and@ aref 'Kattleir shorter Well Qdges dlrect `to` the casing, respec- --edges ofthe two side walls Lgt Eacjleipfv hlcompanion w`V e me o adiacenteed Y one e wing tofold against L weiche .of the fwinks hermana pressure of the spring 25,`

utch bars again, so as to namely at right angles to the 5011519811109 gi arranged ,se that it.

interlockllgrprovisions are arranged so that 'c vthe folded wings can be swung into the front of the casing (as shown in Flgs. 3 and 4) so as to rgqxnpact:theJnmp for shipping or storage." Y

Asaeimplq-arrangement for the releasable interlocking of one end of each side wing Vwith aniend of one oi the companion (upper 30 or lower) wings, I desirably provide ial vformations onl on the free ends o one interhin palr of reector wings, while leaving. t efree cndfsof the othi two interhin wings voi o any specia ormatonsns lus, the'v side (which is hinged vto the right hand-side wallof the casing as A l ,is -perfecu Y, flat A viewed in the dra except for the hin ed whic oonnects itto-'th'e simi arly; at' n On the other hand, the ,left-.hand side 28 is provided at its lower end with 'fin ers p extending at right anglesto'the face of*` y t wing and consecutively 'osetmfmm ,each other so thatthe endet 'the lower wing` 31 can slip and d ge tween them-rnamely, Mtwo router fi rs' d inner 33. arranged ngers also prolect from the free end ofthe upper wing 301m the saine general direction, 4 r:face ,of the wing and forwardly Wheuthereector is v assembled. With the wing 30,-sligl1tlyehorter than the `SideWilgZ to .which itis hin tbefinger prtloon .of thse will sothat thsenterhiuge@ Cee-he feldd and swlgintojthe`-cas1ug ssshown in Fig, Y 4,w1th we other perlof nter 1 wings end of' another" th b f "bt'vin'ftbnsfb weitermachen we es thena spun .re-

:il: nl `the Y I i ugnqdisnfew w bottom wingalwl n ,and alriuliex'- i trol mechanism permits a convenient shortening of the arcs after their tips are somewhat worn, without requiring any touching of the hot carbons or of metal parts con'- nected to the circuit. Consequently, my invention in its various aspects provides a n relatively inexpensive, cheaply shipped and highly effective lamp which can readily be used even by amateurs.

I-Iowever, I do not wish to be limited to the use of my twin-arc control mechanism, in combination with the novel reflector arrangement here disclosed, nor to the use of a particular form of central reflector in combination with my foldable reflector, nor to the use ofmy foldable reflector in connection with two arcs. Neither do I wish to be limited to the details of the construction and arrangement here disclosed, as changes may obviously be vmade without departing either from the spirit of my invention or from the appended claims.

I .claim as .my invention: v l. In alamp, forwardly open casing having upright sides ;A two pairs of reflector wings,each pair comprising a side wing and a transverse winghinged at one end cfa side wing, the hinges of the two wings in the two pairs being respectively at the upper end of one side wing and at the lower end of the other side wing, means associated with the free endof each side wing for releasably latching the same to the free end of one 'of the transverse wings; two hinges respectively connecting each side wing with the mouth end of one of the upright sides of the casing, the said hinges projecting laterally inward of the said sides, an auxiliary reflector bowed about a vertical axis and havingV its side edges respectively engaging the said casing sidesv behind the two hinges, and means within the casing engaging the back of the'auxiliaryreflector to press the said 'edges ofthe auxiliary reflector against the feo y hinges. f

2. In a lamp, a forwardl open casing; and a `foldable forwardly aring reflector comprising four wings, .namely two side wings.respectivelyfconnected by hinges at their inner ends to the casing, a top wing hinged at one end to the upper end of one side wing, and a bottom wing hinged at one end yto the lower-end of the second side wing; the free end of each side wing being f Y. releasably interlocked lwith the free end of thel wing which is hinged to the otherl side wing; the hinging of the side wings to the casing being effected by hinges disposed so that when the top and bottom wings have been swung respectively flatwise against the side wings to which they are hinged, the resulting pairs of folded wings can be swunginto the casing with one pair thereof in front of the other pair.

3. In a lamp, a forwardly open casing; and a foldable forwardly flaring reflector comprising two pairs of interhinged wings, namely two side wings respectively connected by hinges at their inner ends to the casing, a top wing hinged at one edge to the upper end of one side wing, and a bottom wing hinged at one edge to the loweivend of the second side wing; the top wing and the bottom wing each having at the edge opposite the hinging edge a flange extending at an angle to the main lportion of that wing and disposed for engaging the outer face of the side wing opposite to that to which the said top or bottom wing is hinged, and also having adjacent to its outward edge a finger engaging the inner face of the side wing engaged by the flange on the same top or bottom wing to'clamp a portion of the last named wing against the said flange.

4. In a lamp, a forwardl open casing; and a foldable forwardly aring reflector comprising two pairs of interhinged wings, namely two side wings respectively connected by hinges at their inner ends to the casing, a top wing hinged at one edge to the upper end of one side wing, and a bottom wing hinged at one edge to the lower end of the second side wing; the top Wing and the bottom wing each having at the edge opposite the hinging edge a row of flanges euxtending in the same direction at an angle to the main portion of that wing, the flanges in each row being in staggered planes spaced approximately by the thickness of one of the side wings, so that a portion of the side wing adjacent to these flanges may be inserted between the flanges of that row when the reflector is unfolded.

5. In a lamp, a forwardly open casing; and a foldable forwardly flaring reflector comprising four wings, namely two side wings respectively connected by hinges at their inner ends to the casing, a top wing hinged at one end to the upper end of one side wing, and a bottom wing hinged at one end to the lower end of the second side wing; the freeend of each side wing being releasably interlocked with the free end of the wing which is hinged to the other side wing; and an auxiliary reflector disposed within the casing and retained in the casing by the said hinges.

6. In a lamp, .a forwardly open casing; and a foldable forwardly flaring reflector comprising four wings, namely two side wings respectively connected by hinges at '5i- "menen their inner ends to the casing, a top wing hinged at one end to the upper end of one side wing, and a bottom wing hingedV at one end to the lower end of the seeond side wing; the free end of'each side wing being 'releasably interlocked with the free end of the wing which Y1s hinged to the other .side wing; and an auxilia reflector mounted within the casing and xEirxned' substantially as a part of an u right tube, the spread of the.l auxiliary re eetor being eater than the width of the wings of the a oresaid Haring reector to permit'the Haring reflector to be swung into `the mouth of the reiector `after the said top and` bottom wings have respectively been swung against the said side wl use Signed fatl Chicago, Illinois, November 26th 192s'. 20 g LEONARD WESTPHALEN.

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