US2173566A

US2173566A - Lighting fixture

Info

Publication number: US2173566A
Application number: US94493A
Authority: US
Inventors: Dirk G Saaf
Original assignee: GOODRICH ELECTRIC Co
Current assignee: GOODRICH ELECTRIC Co
Priority date: 1936-08-06
Filing date: 1936-08-06
Publication date: 1939-09-19
Anticipated expiration: 1956-09-19

Description

Sept. 19, 1939". D. G. sAAF '1 XXXXXXXXXXXXX RE Patented Sept. 19, 1939 PATENT OFFICE LIGHTING FIXTURE Dirk G. Saaf, Chicago,

Electric of Illinois Application August 6,

Claims.

The invention relates generally to av lighting fixture and more particularly to a fixture of the reflector type especially adapted for use with bowl silvered lamps.

It is a general object of the invention to perfect a new and improved lighting fixture having a reector which produces a high intensity of well diffused illumination, utilizes the full erliciency of a bowl silvered lamp, and is readily manufactured and installed.

Another object is to provide a lighting fixture for use with bowl silvered lamps having a reiiector shaped to produce a high degree of useful downward illumination and to deect a portion of the light upwardly to increase the upward illumination.

Other objects and advantages will become apparent from'the following detailed description taken in connection with the accompanying drawing, in which:

Fig. l is a diametrical sectional view of a X- ture embodying the features of the invention.

Fig. 2 is a diametrical view of a modified form of the fixture shown in Fig. l.

While the invention is susceptible of various modifications and alternativeconstructions, it is herer shown and will'hereinafter be described as embodied in `apreferred form and one modication, but it is not intended that the invention 30 is to be limited thereby to the specific constructions disclosed, but it is intended to cover all modifications and alternative constructions falling within the spirit and scope of the invention as dened by the appended claims.

In the drawing, 5 designates a socket which preferably is of the vertically adjustable type, and 6 designates a lamp commonly known as a bowl silvered lamp. Such a lamp has on its lower or globe end a semi-spherical reflecting means 40 which reiiects the light rays upwardly and prevents direct downward illumination. The refiecting means is formed by the application of suitable matter such as mercury or silver in the globe as a coating, or even by embedding the 45 same in the glass of the globe. Surrounding the socket E is a generally conical supporting hood'l terminating in a threaded lower end 8. Supported from the hood 'I is a reflector generally designated S. Both the hood and the reflector 50 are coated with fused white porcelain enamel.

The reflector is shaped to produce a high intensity of well diffused, downward illumination, and to that end comprises an annular top portion ID which extends upwardly and inwardly from 55 its outer to its inner periphery and is slightly Ill., assignor to Goodrich Company, Chicago, Ill., a corporation 1936,' semi No. 94,493 (o1. 24o-103) An annular inner skirt portion I 2 extends sharply inwardly and downwardly from the inner periphery of the top portion I0 to complete the reflector. This inner skirt portion is disposed to direct the light rays outwardly against the top and outer skirt portions to equalize the intensity of the light striki g those portions of the re- 1,5

flector. In the form of the invention shown in Fig. 1, 'the inner skirt portion I2 is formed as an integral part of the top portion I0 and curves sharply inwardly and downwardly to provide on its inner side a concave reflecting surface of a much smaller radius of curvature than either the top portion I 0 or vthe outer skirt portion II. The curvature preferably isvsuch that a majority of the light rays striking-the skirt portion I2 are 2 5 reected against the top portion I0 vfrom whence they are again reflected against the outer skirt portion II so as to be well diifused before being directed downwardly.

In order that a portion of the illumination may be directed upwardly, the inner skirt portion I2 is formed with an aperture I3 large enough to permit the projection therethrough of a portion of the lamp 6 proper, and the reflector is spaced from the hood 1. Herein the reflector carries a conical collar I 4 having an upper threaded portion I5 adapted to be screwed into the threaded portion 8 of the hood 1. The collar I4 is secured to the reflector proper in spaced relation thereto by a plurality of legs I6 making a perforate mem-- ber thereof. With this construction, light rays from the upper part of the lamp projecting through the aperture I3 in the inner fiange I2 may pass through the space between the reector and the collar I4 to illuminate the ceiling of the room in which the fixture is mounted. Such upward illumination is increased by the shape of the inner skirt portion I2, the outer surface of which serves to reiiect the light rays. The amount of upward illumination may be varied by adjusting the socket 5 so that a greater or lesser portion of the lamp 6 projects through the aperture in the reector, as shown in dotted outline in Fig. 1.

The vertically adjustable socket 5 serves the 55 additional purpose of properly positioning lamps of different size to utilize the full efficiency thereof. The threaded connection between the reflector and the hood 1 initially facilitates installation and wiring and subsequently facilitates removal for cleaning and servicing.

In the modified form shown in Fig. 2, the inner skirt portion l2 is formed of a' separate inverted conical member secured to the top portion Iii by screws I1, while a collar I4 having a threaded upper end portion l5 threaded portion 8 of the hood 'i is formed as an integral part of the reflector. In this form of the invention, the collar 1 4 is an limperforate member preventing any upward illumination.

I claim as my invention:

l. A lighting xture comprising a lamp socket, a supporting hood surrounding said socket having a threaded lower end, and a reflector adapted to be secured to said hood to be supported thereby comprising a collar having a threaded upper end portion for engagement 'with the threaded portion of said hood, and annular top portion extending upwardly and inwardly from its outer to its inner periphery and slightly curved to form a concave reflecting surface on the inner side thereof, an annular depending outer skirt portion extending downwardly and outwardly from its inner to its outer periphery and also slightly curved to form a second concave reflecting surface, an annular inner skirt portion extending sharply inwardly and downwardly from the inner periphery of the top portion to provide inner and outer reflecting surfaces and having a central aperture permitting insertion therethrough of a portion of a lamp to be supported in said lamp socket, and a plurality of legs securing said collar to the reflector proper in spaced relationship to permit upward illumination by the fixture.

2. In a lighting fixture a reflector having an inner annular skirtportion provided with inner and outer reflecting surfaces and having a central aperture, said portion extending inwardly and downwardly vto surround in spaced relation the portion of a lamp projecting through the central aperture in said annular skirt portion, and

for engagement with the Y,

perforate supporting means secured at the top of said reflector to permit upward illumination thereby.

3. In a lighting fixture, a reflector comprising an annular top portion extending inwardly and upwardly from its outer to its inner periphery and curved slightly to form a concave reflecting surface on its inner side, a depending annular outer skirt portion extending downwardly and outwardly from its inner to its outer periphery to form a second concave continuous reflecting surface on its inner side, and an inner annular skirt portion curving continuously and sharply inwardly and downwardly from the inner periphery of said top portion to form a third continuous reflecting surface, the radius of curvature of which vis substantially less than that of the outer surfaces, being operable to reflect outwardly to the other concave reflecting surfaces, said inner skirt portion having a central aperture for the protection therethrough of a portion of a lamp.

4. In a lighting fixture, a reflector comprising an annular top portion extending inwardly and upwardly from its outer to its inner periphery and curved slightly to form a concave reflecting surface on its inner side, a depending annular outer skirt portion extending downwardly and outwardly from its inner to its outer periphery and also being slightly curved to form a second concave reflecting surface on its inner side, and an inverted conical member forming an annular inner skirt portion extending inwardly and downwardly from the inner periphery of said top portion and facing so as to reflect light to the other concave reflecting surfaces.

5. In combination with a lamp and socket therefor, a reflector supported in spaced relation to the lamp comprising an annular skirt portion of sheet-like structure surrounding the lamp having exposed reflecting surfaces on both sides thereof and curved to present both reflecting surfaces to the lamp for reflecting illumination from one portion of said lamp outwardly in one direction and from another portion of said lamp outwardly in a second direction.

DIRK G. SAAF.