US2232499A - Lighting fixture - Google Patents

Description

Feb. 18, 1941. q J. H, 'wA'rERBuRY LIGHTING FIXTURE 2 Sheets-Sheet 1 Filed Nov. 12, 1933 U WNHlixlHi:

, 1941- J. H. WATERBURY 2,232,499 I LIGHTING, FIXTURE Filed Nov. 12, 1938 2 Sheets-Sheet 2 rosettes. 18, 1941 h g I 2,232,499.

. John Waterbury; Chicago, 111., assigninto Benjamin Electric Mfg. Company, Des Plaines, Ill.,a corporation oi Illinois a Application No ember 12, 1938, Serial. 239,93

team, M

Thisinvention relatesto a. lighting fixture and oi barium or uranium.. Also within the housing has for an object the provision of a fighting fl'xmay be positioned suitable transformers which ture that is particularly adapted ior close iny be n ry for the successful op i of spection work such asis encountered in the texe m ury vapor lamps. The tubular light 8 tile and printing industries. g y

Various type of electric llghtgourcgs. and res the trough-shaped reflectors which extend lonflectors have;-been proposed, in the past. Re- E ln ly 01' the cently, however, tmercury arc vapor tube lamps v l y mounted edge to edge and the outside have come into extensive for. 1 mm; e edges 01' each oi the outside reflectors are pivotally v um-rap STATE-sf PATENT cents in poses. ;These tubes and certain incandescent mounted on the housing so that. when a center 10 light. A

lamps generally take magnum, of elongated reflectords raiseliJor lowered within the housing, cy]1nder5, and it, consequently has become necesthe outside reflectors are tilted to 8. predetersary .to develop lighting fixtures cont inin mined extent whereby the light from thereflectors which will accommodate these sources 01' e s may be directed i v r dir c i n 7 s The trough-like reflectors may have-any suit- 15 .11; 1 ,"th' f furth object, f this invenable cross section which will give the desired light tion. toiprovide a. lighting flxturet hi h may distribution. In accordance with one preferred used in conjunction-with anelongated tubular emmdiment, h apex of h trough 1 source. shaped 'reflector is formed so that the light It isa further object of: this invention to proemitted fmm the tubular light swme'wm not be 20 Vlde-a. lightingflxture having a plurality of rereflected. back into'the tubeflectors whjqh may be focusgd within a For a more complete understanding of this in- ;-m1 vention, particular reference will nowbe-made j A t ni g t object of this invention is to to the drawings. A. housing It) may be provided prov! Qan a m 'n fi tur which is which contains a plurality of reflectors H, I2, 95 particularlyadaptable for illumlnating'unifcr l and I3. The reflectors have tubular light sources a predetermined with an mt n 11 ht l4, l5, and l6,'secured therein and extending in hlstili further object or this invention isto a a el a lonjheretohe i t so rces c d a, e t which is particularly useful and It may be mounted at either end by a plurality 0 {of don t incandescent lamps or mercury of suitable separate sockets ll, l8, and I9. Within are tu es having an inside coatingot fl or s nt the housing and above the reflectors, suitable re.- t r uh as e t salts of barium or actant switches 20, 2|, and- 22 may be mounted uranium f V which are employed in conjunction with the merobjects will appear from the following (Fury m u ar light Sources an as description, the attached drawings, and the ap- I The housing II is p o ded wi h false ends 23 pe e 1 g and 24 which may comprise a metal-sheet 2;,3 ri'm to the drawings. wherein a which may be faced with a sheet of polished alu- Fig. 1, 'is a partial longitudinal .s ti nal view minum metal 24.. The false ends 23 ,and 24 may or aflx ure constructed in accordance with one be-secured to the ends of the housing In by any 40 embodiment otthis invention; i suitable means such as spot welding or the like. 6 5 Fig. 2 is a transverse sectional view of the flx- The trough-like reflectors ll,- l-2, and I3 extend ture shOwninFigJI; and 4 4 i Fig. 3 is adiagrammatic sketch indicating the in side-by-side relationship. They extend within fmannerin .which light may be focused from the 'thehousing between the false ends 24 and are fixture as well as the-manner. in which the light vertically movable therebetweent The reflectors g5 is reflected from the reflectorso as to not be re- 'may be surfaced with polished aluminum or other flected back to the source '01 light. I I suitable reflecting material. All of the trough- In accordance with one embodiment oi'this inshaped reflectorsmay be open at their ends so vention, the "fixture may comprise a housing that the end plate 24 provides the reflective surwithin which maybe mounted a plurality oi" face ior the ends of the-reflectors. The outside to I troughped reflectors and tubular sources of reflectors H and i3 are pivotally mounted at light. The tubular light sources may comprise their outside edges on rods 25 and 26. These rodsv mercury vapor tubes which have been coated on extend the entire length 01' the reflector and the inside with a fluorescent material. such as project through holes-provided in the falseend 1 any one or, combination of the fluorescent salts plates arena 24 at either end of the housing In.

longitudinally oi the housing It and are mounted inside edges or .the outside reflectors H and I3.

These rods extend the length of the reflector up to the end plate 24, but do not extend therethrough. The rods 21 and 28 are secured adjacent rods 29' and 30, positioned on the edges of the reflector l2, by means of suitable straps 3| and 32. The straps 3| and 32 are firmly engaged with the reflector |2 by means of suitable rivets 33 and 34. The straps extend around'the rods 21 and 28, respectively, through holes punched in reflectors H and I3 so that the edges of the reflectors II and I2 and reflectors l2 and I3 are pivotally mounted with respect to each other. The straps engage the rods 21 and 28 only loosely so that there is a lost motion in the pivotal relationship between the edges of the reflectors. The rods 29 and 39 at the edges of the reflector |2 extend the length of the reflector and also pass through the end plates 23 and 24 in suitable slots 35 and 38.

Thus, when the center reflector ismoved vertically within the housing, it follows the path predetermined by the slots 35 and 38 which guide the rods 29 and 38. It will be observed that, when the center reflector I2 is moved vertically,

the outside reflectors II and I3 will be tilted in the manner shown by the dotted lines in Fig. 2. In this manner the direction of the light from the various reflectors may be focused in accordance with the diagrammatic representation shown in Fig. 3.

In order that the center reflector may be conveniently raised and lowered in the manner previously indicated, it is secured at either end at the apex to a bracket 31 by means of suitable screws 38a. The bracket extends from the upper surface of the reflector |2 to the housing |I beyond the false end plates 23 and 24. The

bracket 31 is threadably engaged with a thumb screw 38' which extends through a slot 33 provided in the housing Ill. The bracket 31 may thus be moved along the inside surface of the housing H1 in accordance with the direction of the -slot 39 and may be secured tightly in any desired position by tightening the thumb screw 38 down onto the outside ofthe housing Hi.

.It will be observed, therefore, that the center reflector l2 may thus be readily moved in a vertical direction by raising andlowering the thumb screw attached to the bracket 31. The reflector may also be secured in any desired position by merely tightening the thumb screws 38. A slot- 40 may be' provided in the end plates 23 and 24 in order to provide a clearance for the strap 31 when the latter is lowered into the position indicated by the dotted lines in Fig. 2.

The sockets l1, l8, and I9 are secured in fixed relationship to the reflectors and, consequently, the light sources l4, l5, and I3 and the sockets l1, l8, .and 19 also move with the reflectors I2, and I3.

, In order to provide a flrm support for the reflectors and the adjusting means, a pair of -U- shaped -channel bars 4| and 42 are provided which extend the length of the housing In near the inside upper surface thereof. The ends of the channel bars 4| and 42 extend downwardly between the end walls of the housing l0 and the false ends 23 and 24.. The" channel barsmay- A second pair of channel bars 43 and another a not shown may be provided which extend transversely and directly underneath the channel bars 4| and 42. These channel bars extending crosswise of the fixture may have suitable plates 44 extending between them, onto which may be positioned the reactant switches 20, 2|, The channel bar 43 may be secured to the channel bars 41 and 42 by spot welding if desired. Theentire channel bar assembly may be suspended from the housing by means of suitable bolts 45, which may be threadably engaged with the channel bar 43 and nuts ando washers 45a positionedoutside of the housing A -suitable means is provided for attaching the housing ID to any desired electrical outlet,

and 22.

which may comprise a flange 46 attached to the.

source. A reflector having this property may be obtained by forming the apex of the reflector -in such a manner that all of the light given all thetubular light source will be reflected away from the source of light. It will be recognized that the only light reflected back into the light source from the reflector comes from a region of the reflector-positioned back of the source of light. The curvature of this surface, in accord- .ance with one embodiment of this invention,

may be designed to direct the light from the tubular light source away from that source. A

desirable cross sectional shape of the trough reflector is shown in the figures and more particularly in Fig. 3. The apex of the reflective surface-of the reflector is formed to produce a curvature such that the light emitted from any portion of the surface of the light source willbe reflected away from the light source. Thus,

a beam of light striking the reflector |2 at A and being emitted from the outside edge of the light source along its tangential line to A will be-reflected along the line A-.-B. Consequently, any light emitted at any point from the light source, such as from the point C, will be reflected from A along the line A-D which does not strike the light source. Similarly, none of the light originating in the light source reflected from E passes through the light source. This type of reflector has been found to be particularly useful with fluorescent tube lamps, since no substantial portion of the light emitted therefrom is reflected back into and absorbed by the light source itself.

It will be observed that a lighting fixture has been provided which is capable of projecting a uniform amount of light over an extensive area. The light emitted from the fixture may be focused to smaller or larger areas by a simple adjusting While a. particular embodiment of this inven-l tion is shown above, it will be 2. A lighting fixture comprising aninverted trough-like reflector means, sockets within said trough-like tending longitudinally trough-like cover above said reflector means and cooperating with said eflector means to house sides 01' said cover member, the intermediate reflector member being movable up and down and connected with the swinging edges of said pivoted reflector members.

3. A. lighting fixture comprising an inverted the swinging edges of said pivoted reflector members.

4. A lighting fixture comprising an inverted trough-like reflector means, lamp sockets mounted bers; the two outside reflector members being connected with the swinging edges reflector members.

JOHN H. WATERBURYJ trough-like reflector mem

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