US2320829A

US2320829A - Lighting fixture

Info

Publication number: US2320829A
Application number: US389144A
Authority: US
Inventors: Shirley R Naysmith
Original assignee: Miller Co
Current assignee: Miller Co
Priority date: 1941-04-18
Filing date: 1941-04-18
Publication date: 1943-06-01
Anticipated expiration: 1960-06-01

Description

J 1943- s. R. NAYSMITH' 2,320,829

LIGHTING FIXTURE Filed April 18, 1941 I'IIIIIII'II INVENTOR ATTORNEY Patented June 1, 1943 I 2,32asz9 LIGHTING FIXTURE Shirley R. Naysmith, Meriden, Conn, assignor to I Y The Miller Company, Meriden, Cnn., a corporation of Connecticut Application April 18, 1941, Serial No. 389,144

4 Claims. I (.01. 240-78) The present invention relates to lighting fixtures, and is more particularly directed toward direct lighting fixtures adapted to employ fluorescent lamps.

The present invention contemplates a multiple lamp fluorescent lighting fixture wherein the lamps are disposed about a body of semi-cylindrical cross section, and wherein the fixture has end plates which conceal the structural parts of the fixture, these end plates being provided with surfaces adapted to be illuminated by scattered and reflected light directed on to them.

A further object of the'present invention is to provide a multiple lamp fluorescent lighting fixture with an improved form of closure which may be readily made to conform to the shape of end plates carried by the fixture and avoid the use of frames for the closure.

The accompanying drawing shows, for purposes of illustrating the present invention, an embodiment in which the invention may take form, it being understood that the drawing are illustrative of the invention rather than limiting the same.

In the drawing:

Figure 1 is a perspective view of a pendent lighting fixture embodying the present invention;

Figure 2 is a top plan view of the body of the fixture with associated parts;

Figure 3 is an end elevational view with parts in section along the line 3-3 of Figure 2;

Figure 4 is a fragmentary vertical cross se tional View on the line 4-4 of Figure 3;

Figure 5 is a fragmentary cross sectional View on the line 55 of Figure 2;

Figure 6 is a fragmentary view showing a portion of the closure; and

Figure '7 is a diagrammatic view illustrating the placing of the closure in position.

The fixture may have a suitable form of ceiling canopy indicated at II] with pendent tubes II, II. The lower ends of these tubes are threaded as indicated at I2 to receive nuts I3 and I4. The tubes pass through cross straps I5, I5. These cross straps are clamped between the nuts as indicated.

A fixture body I6 of semi-cylindrical contour is flanged inwardly as indicated at I1, I! to stiffen it, and these flanges are secured to the ends of the straps I5 preferably by welding. The ends of the body are also stiffened by cross straps I8, I8 welded in place.

The fixture body I6 supports short plates I9,

and these plates support the fluorescent lamp auxiliaries indicated at 20, 20a. The body I6 also supports fluorescent lamp sockets 2|, these projecting down through holes in the body and being arranged in pairs so as to support fluorescent lamps indicated at 22. The wiring chamber flected downwardly and outwardly.

End plates generally indicated by the reference character 24 are secured to the body by clips and screws indicated at 25 and 26. These end plates have inwardly extending flanges 21 spaced from the lamps, as will be clear from the drawing. The end plates also have inwardly drawn cylindrical elements 28 apertured as indicated at 29. These cylindrical elements are approximately the same radius as the cylindrical body I6. The inner portions of the end plates are flattened as indicated at 3B and inside this flattened area the end plates have outwardly bulging conical portions 3| which may be of rippled contour for ornamental purposes.

Some of the light which is scattered between the flanges 21 and the body I6 will pass out through the windows 29 as indicated at 29 and converge towards the horizontal axis of the fixture. This light falls on portions 3I of the end plates so as to illuminate the same.

Where it is desired to employ the fixture without any diffusing cover about the lamps the parts so far described may be employed, and the lamps would be exposed between the end plates. Where it is desired to enclose the fixture the

flanges

21, 21 are employed to support a closure 32, which may be made of a sheet of plastic diffusing material of proper length to fit between the flanges and of such a width as to extend from the topof the flange at one side to the top of the flange at the other side of the fixture.

The plastic material is provided with stiffening members 33 which may be in the form of channels having inwardly extending flanges 34. These channels are secured to the plastic material by pins 35 extending through slots 36 so that the plastic material may stretch relative to the flanges. The channels 33 may be longer than the closure so as to come opposite the cross straps I8, I8 and the channels and closure may be securely held in place by four spring fingers 31 secured to these cross straps by screws 31a. The springs 31 bear on the flanges 34. Two

longer fingers

38, 38 are carried at the center of the middle cover plate and bear on the top of the channel. The closure may be made of a sheet of plastic diffusing material with the channels secured to it. This material is flexible so that the closure may be passed downwardly from the vertical position indicated in Figure 7 between the

flanges

21, 21 of the end plates and pushed on around into the final position indicated in Figure 3. The pressure of the

springs

31 and 38 will hold the plastic sheet downagainst the

flanges

21, 21 so that the sheet assumes a smooth even contour. The sheet may be readily removed for cleaning, or shifted sidewise to obtain access to a lamp.

It is apparent that, within the scope of the invention, modifications and different arrangements may be made other than is herein dislosed, and the present disclosure is illustrative merely, the invention comprehending all variations thereof.

What is claimed is:

l. A fluorescent lighting fixture comprising a semi-cylindrical body having a reflecting exterior, end plates carried by the body and extending laterally of and below the body, fluorescent lamps supported outside the body, the end plates having inwardly extending semi-cylindrical flanges beyond the lamps for reflecting light generally toward the axis of the body and away from the lamps, inwardly extending semi-cylindrical elements having windows to transmit the reflected light and outwardly inclined surfaces above the said elements to intercept the light transmitted through the windows and be rendered luminous thereby.

2. A lighting fixture such as claimed in claim 1, wherein the flanges and windows of the end plates are concentric with the body and the inclined surface is generally conical.

3. A lighting fixture such as claimed in claim 1, wherein the windows are at substantially the same radius as the body.

4. A fluorescent lighting fixture comprising a semi-cylindrical body having a reflecting exterior, end plates carried by the body and extending laterally of and below the body, fluorescent lamps supported outside the body, the end plates having inwardly extending semi-cylindrical flanges concentric with the body, a diffusing screen comprising a sheet of plastic having stifiening members along its edges, the plastic sheet having a length equal to the spacing of the flanges and a width equal to the arcuate length of the flanges and being sufficiently flexible to permit assembly by passing it downwardly at one side of the fixture between the end plates and inside the flanges until the entering edge comes opposite the other side of the fixture, and springs acting on the stifiening mem-- bars to hold the sheet against the fianges so that it assumes a smooth semi-cylindrical formation.

SHIRLEY R. NAYSMITH.