US1663657A - Lighting fixture - Google Patents

Description

March 27, 1928..

E. E. GUTH LIGHTING FIXTURE Filed Feb. 17. 1926 2 Sheets-Sheet 1 MlgfRNEOR BY Am -V ATTORNEY March 27, .1928. 1,663,657

E. F. GUTH LIGHTING FIXTURE Filed Feb. 17. 1926 2 Shets-Shet 2 INVENTOR Patented Mar. 27 1928' p DWIN. F. IGUTH, E s'it] L0UIS,1MISSQURI.

I men-rifle FIXTURE.

Application filed" February 17,1926. Serial No. 88,758

Myinvention-relates to that class oflight- I l0 bowl and thus interferingwith the passage- Ofihelumins emitted by the lamp, and-in this mannerlowering the efficiency of the unit;

My invention has for its furtherobject t'o providesuch' a mounting forth'ecanopy reflectoi that the. relationship to the lamp may be adjusted vertically, and'to so' construct the canopy, that it Yca-n'be "used to direct. the light rays to eitheror. both .ceiling andv work ing plane.

My inventionhas for its further object to so'shape thecontour OfftllG globe, as to produce lowest. brightness in the lower portion which is most visible and closest to thefilament at theside which permits the greatest volume oflight to pass through it at this pointforthe reason that there is less-opaque material around the filament at this point I and that the light rays strike: this surface in a direct direction.

A further object is' to position the lamp filament high so as; to produce the low brightness at the source, very wide light distribution curve, and the combination will function in efiiciency practically the same as the regular enclosing globes in overall-output or efiiciency, and will produce a much wider light curve, by photometer test, than diffusing globes alone, which controls the light rays with less on the ceiling and correspondingly greater portion on a' plane slightly below the horizontal, and lower brightness at the source than most of the enclosing globes of the same dimensions.

This constructiongives my unit this added advantage, as shown by the photometric chart of the light curve of very low intensity directly above the fixture and gradually increasing in intensity to a position about degrees below the horizontal and maintaining a. substantially uniform intensity beneath that point.

My means for accomplishing the foregoing objects may be more readily understood by reference to the accompanying drawings in which i i broken-awayto showthe interior}; I

Fig. 2' is an enlarged detail view showing the adjustment means provided whereby the reflector canopy may be ve'rtically adjusted; Fig-g3 is a side elevation, a portionrbeing broken away, showing a modified form of refleetor'canopy;

r Fig: 1 is a view ontheline-33 in Fig. I

3 in the direction indicatedby the arrows. Similar reference numerals referto'simi lar parts throughout the entire description. 'As shown in the drawings,' the' light or lamp bulbis mounted in the conventional Fig. 1-is a side elevation,-aportion being socket Q which is preferably the standard porcelain keyless type. It is mountedin a standard fitter 3 being secured} therein by means of a nipple carried'by an eye 4 by which the unit maybe suspended by means of a chain 5 (only aportion of; onev linl'c thereof beingsh'ow n The periphery 6 of the fitt'er 3 is provided withjthe usual thumb 'screwsll', the inner ends 'ofwhich engage the lip 8'' formed on" the neclt'12 of'the globe ST The configuration of-this globe9, as will be obvious to per-sons skills-din theart, is such that it will produce lowest brightness in the lower ;p orti'on which is most visible and closest to the filament at th'e side which permits-the greatest volume of light to pass through it at this point-for thev reason that there is less opaqueimaterial: around the filament at thispoint and't'ha't the light rays strike this surfacein a direct-direction, and will redirect many: ofrthe light rays to the under surface of" thereflector canop This canopy reflector lO'is'constructe-d' with a downwardly" and: inwardly: tapering por tion 11, which is fitted to, and coincides with, the exterior surface of the neck 12 of the globe 9. Both the upper and lower surfaces of the reflector canopy 10 are finished so that they'will function in the best possible manner as'a reflector. The canopy reflector 10 is preferably stampedfrom sheet metal, and three fingers 13, 14 and 15 are formed,

extending inwardly from the opening in the clearly shown in Figs/1 and 3. The openings 16 or 17 in the fingers will permit the screws 7 to pass through, his shownin the drawings, the screws extend through the openings 16, wit-h the result that a large number of the direct rays of light emitted by the lamp 1, will impinge upon the upper surface of the reflector canopy 10, whence they will be redirected or reflected to the ceiling, and in this way it will be satisfactorily illuminated. The remaining light rays will strike the globe, some of them will pass through and others will be redirected to the lower surface of the reflector canopy, whence they will be reflected tothe working plane.

It will be apparent from the foregoing description that the position of the reflector canopy may be varied vertically, as

shown in the dotted lines, to meet the desired conditions, since this adjustment will vary the amount of the reflecting surfaces exposed to the lightrays, and if the condition is such as to render it desirable, they may be entirely excluded from the upper 7 surfaces and all of the light rays directed the specific construction shown in the draw-' ings, but I desire it to be understood that I reserve the privilege of utilizing all the mechanical changes to which the invention is susceptible, my invention not being limited except as I have defined and limited it in the hereinafter contained claims.

Having thus described my invention what I claim is new and desire to secure by Letters Patent of the United States is:

1. The combination in a lighting fixture of a fitter, a globe having a convex lower and a concave upper portion terminating in a neck, a lamp bulb in said globe, a socket mounted in said fitter, a reflector canopy mounted in juxtaposition to the neck of said globe, and means to adjust said reflector canopy vertically.

2. The combination in a lighting fixture of a fitter, a globe having a neck which flares downwardly and outwardly and joins a convex portion, whereby low intensity is produced on the lower convex portion and low absorption in the neck portion, a lamp bulb in said globe, a socket mounted in said fitter, a reflector canopy mounted in juxtaposition to the neck of said globe, and means 7 to adjust said reflector canopy vertically.

3. The combination in a lighting fixture of a fitter, a globe having an upwardly extending neck, a lamp bulb in said globe, a socket mounted in said fitter, a reflector canopy formed with a downwardly and inwardly extending portion which is fitted to and coincides with the outer surface of said neck, and means to adjust said reflector canopy vertically.

4. The combination in a lighting fixture of a fitter, a globe having an upwardly extending neck, a lamp bulb in said globe, a socket mounted in said fitter, a reflector canopy formed with a downwardly and inwardly extending portion which is fitted to, and coincides with the outer surface of said neck, and means to adjust said reflector canopy vertically, said means being formed integral with said canopy.

I 5. The combination in a lighting fixture of a fitter, a globe having an upwardly extending neck, a lamp bulb in said globe, a socket mounted in said fitter, a reflector canopy mounted in juxtaposition to the neck of said globe, and means to adjust said reflector canopy vertically, said means comprising a plurality of fingers secured to said canopy and means to ad ustably secure said fingers to said fitter.

EDWIN F. GUTH.

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