US952995A - Electric lamp. - Google Patents

Description

H. vN. POTTER.

ELECTRIC LAMP.

APPLICATION FILED AUG. 3, 1903.

952,995, Patented Mar. 22, 1910.

WITNESSES: INVENTOR \flIAAj/M Pm 69843444, M

UNITED sTArrEs PATENT OFFICE.

HENRY NOEL POTTER, OF NEW ROCHELLE, NEW YORK, ASSIGNOR, BY MESNE AS- SIGNMENTS, T0 NERN ST LAMP COMPAN PORATION OF PENNSYLVANIA.

Y, 01' PITTSBURG, PENNSYLVANIA, A COR- ELEGTBIG LAMP.

Specification of Letters Patent.

Patented Mar. 22, 1910.

To all whom 'it may concern:

Be it known that I, HENRY Noni. Pom, a citizen of the United States, and a resident of New Rochelle, in the count of 'Westchester and State of New Yor have invented a new and useful Im roveme'nt in Electric Lamps, of which the fbllowing is a specification.

My invention relates to electric lamps and it has for its object to provide a device of this character with means whereby a maximum percentage of the light produced by the light emittin member or members may be utllized-efi'ectively and the desired illumination may be distributed efficiently over a large and well defined area. In order to effect these results, I have devised the means shown in the accompanying drawing, in which the single figure is a view, partially in elevation and partially in section, of a lamp in which the light emitting member or members are conductors of electricity only when heated to a comparatively high temperature. For convenience of description such light emitting members will be hereinafter designated as glowers.

While I illustrate and describe a lamp in which li ht emitting bodies of a specific type are emp oyed, my invention has or may have a more general application and I therefore desire it to be understood that I employ the-term glowers in a eneric sense as designating any body of sohd, liquid or gaseous material which produces light by incandescence.

As shown in the drawing, the 1am 1 comprises a housing 2 for certain of t e 0 erating parts of the lamp mechanism Fnot shown) and one or more glowers 3 supported by a suitable holder or frame 4, a l as is usual in the art. In lieu of the usual glass globe within which the glowers are supported, I provide a lobe 5 having a bottom aperture, in whic is located a reflector 6. This reflector, as shown, is made double though it might, if of proper form, he made as a single, integral structure. The upper or inner portion 7 is parabolic in form and is provided with a central opening in which is located a small glass lobe .or cup 8 havin a projecting rim 9, WhlCh rests upon the e ge of the reflector surrounding the opening and thus supports the globe in positlon.

The parabolic reflector 7 is so formed and disposed that the axis of the generating parabola is located below and at a suitable angle to the horizontal in order to insure the desired distribution of the light. The bottom edge of the reflector 7 is provided with a plurality of lugs 10 which rest upon the edge of the globe 5 adjacent to the openin therein and thus serve to sup ort the re ector. An desired number of t ese lugs may be emp oyed, but three will generally be suflicient. The inner portion 11 of the reflector is provided with an annular series of tongues or prongs 12 which are bent downward and exert a slight spring action against the sides of the small globe 8, sufficient to hold it firmly in position but not suflicient to break the globe when it is subjected to the expansive action of the heat from the glowers. The lower edge 13 of the reflector 11 projects outward and upward beneath the edge 14 of the globe 5 and is fastened to the lugs 10 b means of screws 15, the reflector, as a who e, being thus securely fastened to the edge of the globe 5 and within the opening therein.

It will be seen from the structure and arrangement shown and described that a portion of the light emitted by the glowers will bereflected, by the parabolic reflector 7, outwardly and in an approximately horizontal direction and that another portion of the li ht will pass through the globe 8 and be di used thereby and considerable portions of it will be reflected downwardly and outwardly by the portion 11 of the reflector, substantially the entire amount of light being, therefore, projected and distributed with a proximate uniformity over a large area and little, if an of the light being unproductive of usefu illumination.

The specific devices employed in practicing my invention are obviously subject to variation from what is shown and I therefore desire itto be understood that the invention is to be limited only as limitations mziy be imposed by the prior art.

claim as my invention: 1. In an electric lamp, a reflector located below the plane of the glower or glowers and provided with an opening directly beneath the same and with tongues or prongs around said opening, a on or globe having a projecting rim and hel in .said opening by said rim and said' tongues or prongs,'and means for supporting sa1d reflector.

2. In an electric lam a globe having a bottom opening and a ouble reflector having peripheral projections between which is clamped the edge of the globe which bounds said opening.

3. In an electric lamp, a parabolic reflector located below the glower or glowers and provided with an opening directly beneath the same, a 'light-diflusing cup or globe having a projecting rim for supportmg it in said opening, and means for supporting said reflector.

4. In an electric lamp, a bottom aperture, a double re ector having a central opening and located in said aperture and clamped to the surrounding edge lobe having a r of the globe and a small light-difiusing globe supported in the central opening in the reflector. I

5. In an electric lamp, a globe having a bottom aperture, a reflector having top and bot-tom reflecting surfaces and a central opening and removably located in, said aperture and a small, light-diffusing globe re-' movably supported in the central opening in said reflector.

In testimony whereof, I have hereunto subscribed my name this 15th day of July, 1903'.

HENRY NOEL POTTER.

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