US2261187A

US2261187A - Fluorescent lighting fixture

Info

Publication number: US2261187A
Application number: US343799A
Authority: US
Inventors: Kenneth R Scribner
Original assignee: Hygrade Sylvania Corp
Current assignee: Hygrade Sylvania Corp
Priority date: 1940-07-03
Filing date: 1940-07-03
Publication date: 1941-11-04
Anticipated expiration: 1958-11-04

Description

Nov. 4, 1941. k sc N I '2,261,187

FLUORESCENT LIGHTING FIXTURE Filed July 5, 1940 2 Sheets-Sheet 1 KENNETH Scar/m)? INVENTOR;

Nov. 4, 1941; K. R. SCRIIBNVER ,1

I FLUORESCENT LIGHTING FIXTURE Filed July 3, 1940 2 Shets-Sheet 2 INVENTOR,

Patented Nov. 4, 1941 FLUORESCENT LIGHTING FIXTURE Kenneth R. Scribner, Beverly, Mass, assignor to Hygrade Sylvania Corporation, Salem, Mass., a corporation of Massachusetts Application July 3, 1940, Serial No. 343,799

This invention relates to electric gaseous discharge lamps and in particular to apparatus and fixtures for operating such lamps.

Since discharge lamps require certain auxiliary equipment for their proper operation, provision must be made for a'suitable housing therefor.

Accordingly, an object of this invention is to provide a fixture which will adequately provide for all auxiliary equipment.

Another object is to provide a fixture in which all auxiliary equipment is mounted in or on the housing thus-leaving the reflecting surface free and clearof any equipment that would tend to mar the reflecting surface.

A further object is to obtain a fixture which will embody the above features and at the same time provide a maximum of light efficiency.

Further objects and features of this invention will be apparent from the specifications below, taken in conjunction with the accompanying drawings in which:

Figure 1 is a top view of Figure 2 is a side elevational view of the'complete fixture.

Figure 3 is an' end view of 'the complete fixture.

Figure 4 is a side perspective view of the complete fixture.

Figure 5 is a detail of the stiffening strap.

Figure 6 is a perspective view partly in section of the reflecting section of the fixture.

Figure 7, is aside elevational view in section showing the method in which the housing and reflecting sections are joined.

Figure 8 is a detail of the hanging strap.

Figure 9 is a bottom view of the housing section howing the lamp sockets, switch sockets, knock-outs, and hanging straps.

Figure 10 is a schematic wiring diagram of the auxiliary equipment located in the housing.

The fixture unit is composed of two separate sections, one being the reflecting surface, I and the other being the housing 2 containing the auxiliary equipment.

'If the sockets 3, 4, 5 and 6 for the lamps l and .8 were attached to the reflecting surface section I of the fixture, the hard, glossy, enamel, reflecting finish would be susceptible to chipping and scarring when the sockets were being ln-' ment. Slots [2 of a size and shape to permit the the complete fixture.

or screws through the reflecting surface.

4 Claims. (01. 240-78) made in the reflector before the enamel or other reflecting surface is applied thereon. Thus the possibility of scarring or chipping the surface due to the installation of lamp sockets is eliminated. v

A similar situation presents itself with respect to the switches l3 which form a part of the starting apparatus. Since a starting switch must be used in conjunction with each lamp, provision must be made for them as well as for the lamp sockets. This is done by providing slots. I5 of a size and shape .to allow the insertion therethrough of the switches into the socket ll and I8, attached to the housing between the lamp sockets. These slots for the switches are located at, a point between the slots for the lamp sockets at each end and ar also inserted before the enamel or other reflecting surface is applied.

Keeping in mind at all times the desirability of maintaining the reflecting surface free from screws, nuts, bolts and the like that might tend to scar or chip it, this invention embodies a means of securely fastening the housing section to the reflecting section without the use of nuts, bolts The top of the reflector section of the fixture has a V shaped portion l9 running longitudinally down the middle thereof. Two metal

stiffening straps

20 and 2| of a material similar to that from which the fixture itself'is formed, are welded, one at each end, over the recess formed by the V shaped channel. The channel forms a recess for the heads of the bolts 22 and 23 which are locked to these straps. These bolts are long enough to extend up through the housing section and firmly lock it to the reflecting'section.

The

hangisg straps

24 and 25 are inserted in the housing section through the slots 28, 29 and insertion therethrough' of the lamp sockets are 5 30 and 3| in such a manner that holes in these straps will coincide with the holes 26 and 21 in .the housing. It is through these holes that 'the bolts 22 and 23 fastened to the

stiffening straps

20 and 2| pass when the reflecting and housing sections are joined together. By thus helping in distributing the weight of the reflector sectionfpulling on the housing section these straps perform a two-fold function for'their

ears

32, 33, 34 and 35 provide a means by which the fixture as a whole may be suspended when in use.

The housing section is of a length slightly greater than the length of the lamps. The lamp sockets 3, 4, 5 and 6 are mounted opposite each other at both ends of the housing by means of screws of the like. Switch sockets I1 and I8 are similarly fixed at each end between the two lamp sockets. Thus, when the two sections are joined together, the lamp sockets slide through the slots provided therefor in the reflecting surface and the switch sockets are positioned so that they may receive the switches through the slots provided therefor between the slots for the lamp sockets.

The wiring connections from these lamps and switch sockets run towards the center 36 of the housing section which is recessed sufliciently to carry the ballast auxiliary or similar equipment, and still allow for a flush mounting of the housing section on the reflecting section. Knock-

outs

31, 38, 39 and 40 are provided at various points in the housing for line connection purposes.

The V shaped section l9 which runs longitudinally down the middle of the reflector serves other purposes besides providing channel for the heads of the bolts which look the reflector and housing sections. It acts as a stiffening unit thus strengthening the whole reflector. Since the reflector and the V shaped section are parabolic in section with the lamps as focal points, the lamps fill the reflector with light leaving no dark spots in the reflector.

Another feature of the fixture in my invention is that, by reason of its assembly, the reflector section may readily be taken down and cleaned without the necessity of severing any wiring connections or taking apart any of the auxiliary equipment. All that is necessary is to remove the lamps from their sockets and remove the nuts which are screwed onto the bolts joining the reflector to the housing.

Thus in the fixture in my invention, there are but two separate sections which go to make up the entire fixture and these are joined in a manner which obviates any possibility of scarring or chipping the reflecting surface and eliminates the necessity of screws, nuts, bolts or the like appearing on the reflecting surface.

In Figure 10, a schematic wiring diagram, the lamps 7 and 8 are connected in parallel to the lead-in wires 4| and 42 of the line. The electrode 43 of the lamp 1 is connected to the lead-in 4| of the line through the inductance 44 and the condenser 45. The electrode 46 of the lamp 8 is connected to the lead-in 4| of the line through the inductance 41. The electrode 43 of the lamp 1 is connected to the electrode 48 of the same lamp through a switch circuit consisting of an inductance 49, a condenser 50, a resistance 5| and a bimetallic strip 52. lamp 8 is connected to the electrode 53 of the same lamps through a switch circuit consisting of a condenser 54, a resistance 55, and a bime- The electrode 46 of the v tallic strip 56. Both of these switch circuits are normally open. The electrodes 48 of lamp 1 and 53 of lamp 8 are connected with the lead-in 42 of the line. This circuit is designed to reduce stroboscopic effect in the same manner as described in the United States Patent No. 2,195,114 issued March 26, 1940.

What I claim is:

1. An electric lighting fixture for two elongated tubular lamps, said fixture comprising: electrical control apparatus for said lamps, a housing unit for said apparatus, two lamp sockets extending out of each end of said housing, a strap for hanging said fixture attached to said housing with the ears of said strap projecting up through said housing, a concave reflector having a parabolic lateral cross-section with a V-shaped center portion, said reflector having slots therein, through which said lamp sockets project, a strap across said V-shaped center portion, and a bolt through said latter strap and through the strap for hanging said fixture.

2. An electric lighting fixture for two elongated tubular lamps, said fixture comprising: electrical control apparatus for said lamps, a housing unit for said apparatus, two lamp sockets extending out of each end of said housing, a strap for hanging said fixture attached to said housing with the ears of said strap projecting up through said housing, a concave reflector having a parabolic lateral cross-section with a V-shaped center portion, said reflector having slots therein, through which said lamp sockets project, a strap across said V-shaped center portion and means to join said housing unit and reflector through said strap for hanging said fixture and said strap across the V-shaped center portion.

3. The combination of claim 2 in which said lamp sockets project through said reflector to hold the lamps at the foci of the parabolas which form the parabolic lateral cross-section of said reflector with the V-shaped center portion between the lamps.

4. An electric lighting fixture for elongated tubular lamps, said fixture comprising: electrical control apparatus for said lamps, a housing unit for said apparatus, a concave reflector having a parabolic cross-section with a V-shaped center portion, two lamp sockets extending outward from each end of said reflector; a strap across said V-shaped center portion, and a bolt through said latter strap to hold said reflector to said housing.

KENNETH R. SCRIBNER.