US2773976A - Lighting fixture - Google Patents

Description

Dec. 11, 1956 e. E. GLATTHAR ETAL 2,773,976

LIGHTING FIXTURE Filed March 16, 19543 l/V MEN 7' OR George E G/ofibar Arf/n/r W Mafie'son United States Patent lice LIGHTING FIXTURE George E. GlatthanUniversity Heights, and Arthur W.

"Matteson, Lakewood, Ohio, assignors to The Art Metal Company, Cleveland, Ohio, a corporation of Ohio This invention relates to improvements in lighting fixtures.

One of the objects of the present invention is to provide a lighting fixture having a high light output efliciency and providing as much light as possible with little brightness and glare.

A further object of the present invention is to provide a lighting fixture having structural simplicity, being economical to manufacture, designed for easy assembly and being of strong and sturdy construction.

Other features of this invention reside in the arrangement and design of the parts for carrying out their appropriate functions.

Other objects and advantages of this invention will be apparent from the accompanying drawing and description and the essential features will be set forth in the appended claim.

The drawing shows a side elevational view of the lighting fixture partially in section.

Before the form of lighting fixture here illustrated is specifically described, it is to be understood that the invention here involved is not limited to the structural details or arrangement of parts here shown since structures embodying the present invention may take various forms. It also is to be understood that the phraseology or terminology herein employed is for purposes of description and not limitation since the scope of the present invention is denoted by the appended claim.

Those familiar with this art will recognize that the present invention may be applied in many ways, but it has been chosen to illustrate the same as a ceiling lighting fixture with one of the conventional type electric bulbs.

The lighting fixture as shown comprises a support having a ceiling canopy 11 adapted to be secured to a room ceiling in the conventional manner with a downwardly directed socket husk 12 secured thereto. A reflector flood type or processed lamp bulb 13 is provided with a base adapted to be detachably mounted in said socket husk 12, with said base being of the conventional screw type or any other desired structure. An annular bulb portion 13b projects downwardly from the base and is generally made of glass or any other equivalent or satisfactory material with this bulb portion 13b having an annular outer surface increasing in lateral dimensions to a maximum diameter as it extends downwardly away from the base and having a convex light transmitting surface, such as clear or translucent glass, shown at 13c bridging across this maximum dimension. The reflector flood type or processed lamp bulb 13 has an inner reflecting face 13d formed on the inner wall of the annular surface of bulb portion 13b with this reflecting face being or" highly polished metallic coated material,

or any other equivalent reflecting surface.

A light reflector means is provided in the present disclosure for directing the light from said bulb 13. This reflector means includes a light multiplier reflector 15 Secured to the support 10, associated with, and projecting 2,773,976 I Patented Dec. 11,-

downwardly from the bulb 13. This reflector 15 has an outwardly and upwardly extending light fixture bowl 16, annular in form, secured by its lower edge to the light exit lower end of the reflector by welding or any other equivalent connection. The bowl 16 is secured to the support 10 by a plurality ofspaced rods 17 with each rod having-hooks at opposite ends-detachably secured in a hole 12a in the bottom of the socket husk 12 and in a hole 18a in a bracket 18 riveted or otherwise secured to the inner and upper face of the bowl 16.

This reflector 15 has a specular, highly polished inner reflecting surface. This reflector 15 can be made of aluminum and be given a highly polished surface to achieve this result so that there is less light absorption and increased lighting efliciency. This reflector 15 is annular in form and coaxial with the longitudinal axis of bulb 13 with a light entrance upper end adjacent to and generally surrounding and equally spaced from the maximum dimension of bulb portion 13b. Its light exit lower end is formed by making the annular reflector surface therebetween gradually increase in lateral dimension along a curve constructed to serve as an extension of the bulb portion reflecting inner face 13d to form therewith a generally continuous curve, as clearly shown in Fig. l. The light entrance upper end of reflector 15 extends upwardly above the lower edge of bulb reflecting face 13d. Therefore, the reflector flood type or processed lamp bulb 13 with its reflector inner face 13d combines with reflector 15 to form a large light reflector means for controlling the downward light distribution. This reflector 15 acts as a light directing shield so that substantially all the light outwardly directed from the exit end is confined within a downwardly directed cone coaxial with the reflector and bulb longitudinal axes and having approximately a 45 apex angle between the surface of the cone and the axis thereof, as shown in Fig. 1. Therefore, the light multiplier specular reflector 15 and bulb reflector inner face 13d intercepts the lamp light above 45 and redirects it into the useful light zone below 45. As much light as possible is directed down into the useful light zone at a distance therefrom. The curved shape of the reflector is a combination of an ellipse and a parabola combined for best light distribution with minimum brightness.

It should now be apparent that the present lighting fixture has a high lighting efliciency and directs the downwardly directed light within a narrow working zone to provide as much light as possible with little brightness at a distance.

Various changes in deta-ils and arrangement of parts can be made by one skilled in the art without departing from the spirit of this invention or the scope of the appended claim.

What we claim is:

A lighting fixture, comprising a support, a reflector type processed bulb having a base detachably mounted in said support and a portion projecting from said base, said bulb portion having a surface with an inner reflecting face increasing in lateral dimensions to a maximum as it extends away from said base and having a convex light transmitting surface bridging across said maximum dimension, and a light directing specular reflector secured to said support and associated with said bulb, said reflector having an annular inner reflecting specular surface coaxial with the longitudinal bulb axis, said reflector having a light entrance end adjacent to and generally surrounding and equally spaced from said maximum dimension and having a light exit and remote therefrom with the annular surface therebetween gradually increasing in lateral dimension along a curve constructed so that the reflector inner reflecting specular surface is an extension of said bulb portion reflecting inner face to fdrmtherewitha generam 'continuous reflecting curve surface, said reflector acting-as alight directing shield so that substantially all the light outwardly directed from said exit end is eonfined withina cone coaxial with the lfiethrf ldngitndinai' axis I 7 References Cited in the file' cf'this patent STATES 811,621 Boas et a1. t Apr. 10, 1906 1,137,954 Cravath May 4, 1915 1,390,070 Villaret V- 1 Sept.- 6, 1921 Sheafler Oct. 12, 1926 Zimmerman June 28,1927 Ames .Nov. 20, 1928 Rambusch Nov. 7, 1939 Stair et a1. Nov. 5, 1940 Lanquist Sept. 11, 1951 Runge et a1. Oct. 6, 1953 FOREIGN PATENTS Great Britain A. D 1906 France A. D

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