US988824A - Reflector. - Google Patents

Description

L.V A. SAGBNDORP'H.

RBFLEOTOB.

APPLIGATIoN Hmm D110. a1, 1910.

` .Patented 11pmI 1911.

UNITED 'STATES PATENT oEEioE.

` LLOYD 4 A. SAGENDORPH, OF PHILADELPHIA, PENNSYLVANIA.

REFLECTOR.

shall be mechanically strong and substan tial, as well as convenient and relativelyv inexpensive to manufacture. y

Another object of the invention is to provide a ventilated reflector for incandescent lamps which shall be of such construction that its Ventilating openings shall be shield f ed to prevent passage through them of direct l rays of light emitted from said lamp.4

I further desire to provide a reflector with iin roved means whereby it may be *adjust-v ab y connected to an incandescent lam-p socket to render possiblea variation of its position relatively to the lamp andthus to vary the area over which the rays of light from the lamp' may be distributed.

These objects and other advantageous ends I secure as hereinafter set forth, reference being had to the'accompanying drawings, in whichp,

' 4-igure 1, is a vertical section of one form of my invention, and lamp in such positions that the rays of li ht are concentrated over a minimum area; Fig. 2, is a section similar to Fig. 1 in which the relation -of the reflector to the lamp has been altered so that the rays of lightwill be distributed over a greater area than with the arrangement shown in Fig. 1; Fig. 3, is a f fragmentary vertical section showing a modified form of my reflector and its co-acting socket-supporting member, and Fig. 4, is afragmentary' side elevation of a simple form of my invention.

In the above dra-Win s, 1 represents a shell preferably made of spun sheet metal such as steel or brass, havingin t-lie main the form. of a parabolic reflector. The uppercr small diameter portion 2 of this shell, however," 's slightly bulged from the arabolic form, and terminates in a threaA ed portion 3 ofgenerally cylindrical form. Mounted Within this shell is a sec# ond shell 4 forming the reflector proper and 9, and I vsocket lable material having one end flanged .suitably formed this clam illustrating the reflectornated. In any case,

Specification of Letters Patent. Patented Apr, 4, 1911 Application tiled December 31,-1910. Serial No; 690,234.

made preferably of thin sheet aluminum,

likewise s un into the Vform desired and closely fitting within the shell 1, to which it is inseparably held by having its outer edge, with that of said shell, turned outwardly over a suitable wire to form a lip o1' bead 5.

`It is noted that the reflecting shell lies practically in contact with the inner surface `of the main portion of the shell 1 and extends inwardly toward what would constitute the apex of the paraboloid figure 'whose shape it has, into the bul ed-portion 2 of the shell so as to complete y shield a series of openings 6 in said bulged portion from the direct rays of the incandescent lamp 7 with which the device is designed to be used. This lamp inthe present instance is shown as mounted in a lamp socket 8 whose base portion is provided with a shouldered bead in order to attach the reflector to this I provide a threaded shell 10"of suit- 1nwardly so as to be capable of fittin over orsnapping onto the bead or shou der 9,

to which it may be held by a suitable forin of clamp 11, although if said flanged end be may be omitted. The threads of the c lin rical shell-,1 0 are designed to co'actwit the threaded; f rtion 3 of the reflector, which maythe'i'e dre be screwed thereon so as to be supported in any desired relation to the lamp 7. If,y as shown in Fig. 1, the part 3 of t e reflector is engaged with the lower part of the threaded shell 10, then the rays of light from the lamp are reflected `inlsubstantially arallel lines and the area over which the ight is distributed is relatively limited. If, on the other hand, the reflector is adjusted so that its threaded portion 3 engages the upper part of the threaded. shell 10 asin Fi 2,

then while as before it sends out 'rays o the 'lamp in parallel lines, the direct rays of light from said lamp are distributed over a considerabl Wider angle than before, so that a consi erably reater area is i1lumiowever, the openings 6 provide for the escape of the air heated bythe lain thus preventing any undue heatin of t e reflector or of any material near" e same. At the same time, by reason `of the upwardly projecting end of the res ell of the reflectonthese fleeting or inner openings are completely shielded so that no direct rays of light can .esca e from them. The combination is thusren ered available for use in factories or shops where it 1s nece1 essarythat the light from the lamp be directed over a definite area without any prtion of it being permitted to reach the eyes ofv an operator above the lamp or reflector;

l/Vhile in that form of my invention shown in Figs. land 2 the reliector may beadjusted by insensible degrees from either of its .extreme positions tothe other, I may if I desire, make the various parts as shown in' Fig. 3 so that the reflector may be held in one of several definite positions. In' this case the shell attached tothe lamp socket 8 is constructed as indicated at 10a with'a relatively few annular shoulders or vbeads 12, while the upper end 3 of the reflector is provided with a number of vertically extendingy slits'and has an internally extending bead 13. With this arrangement said reflector may be moved up' or down on the shell 10a' so that its bead 13 may rest upon and cause it/to be supported by any one 'of the annular beadsY 12, in any of' several adjusted ositions 'relatively to the lamp 7.

If desire ,the upper end of the reflector" may be made as shown at 3a in Fig. 4, e. of a plain cylindricalform designed to be clamped or otherwise attached to' the lamp socket. In any case, however, I provide the thin and relatively delicate ofsheetl` l metal 4 mounted within and protected by the shell 1, so that said inner shell may be rela tively light and inexpensive since it is not Y exposed to injury.

1. The combination of two bodies of sheet metal in the form of a concave reflector mounted one withinthe other in closel prox# imity; the outer body of metal having ventilating openings and the inner body being extended to shield said openings from the light ofvv a lamp-within the reflector.

2. The combination' witha lamp'of a re- Hector mounted thereon and consisting of a supporting portion surrounding the vlamp and provided with Ventilating means; with a liningfor said supporting portion consisting of thin sheet material extending between the lamp and the Ventilating openings A'so as to shield the latter.

^ 3. As anew article of manufacture a reflector formed 'of two bodiesl of different sheet metals having'substantially the form of a paraboloid; said bodies beingstructurally independent of each other but in lclose proximity and `having their' outer edges turned over so as -to hold them together; the inner of said bodies of metal,

being of a reflecting material and being eXq I tendedv vtoward the. apex of the reflector to shield the Ventilating openingsin the outer body.

name to this specification, in the presence of two subscribin witnesses.

. .LL YD SAGENDORPH.

WILLIAM E. BRADLEY, `VVIrLA. BARR.

Intestimny whereof, have signedmy

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