US 1844639 A
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Fb- 9, 1932. K. RjcRUMPToN 1,844,639
CEILVING D'IFFUSING LIGHTING FIXTURE Filed Oct. 8,. 1930 INVENToR."
A TTORNEY Patented Feb. 9, 1932 f` 1- uurrlzn STATES PATENT oFFIcE i KENNETH R. oRUnIIToN,` `E PITTSBURGH, PENNSYLVANIA, AssIeNoR-To` EAUEMANN- f DEPARTMENT sToREs, INC., or PITTSBURGH,rENNsYLvANIA, A CORPORATION or NEW YORK CEILING `nIrEusINa LIGHTING FIXTURE Application filed october s, 193e.` serial No. lianes?.`
This invention refers to improvements in means for illumination, particularly of the interior of buildings such as stores, of the kind generally known as a ceiling diffuser.
Y The object in view is to interpose between a source of light, as a single lamp, or a cluster thereof, of a li ht diffusing bowl or lens, mounted below tie light source within a surrounding-framing or easing, and adapted for vertical adjustment, with relation to the general level of the ceiling.
. The light diffusing bowl, which is of glass or other suitable transparent or translucent material, may be of any suitable design either circular, rectangular, or hexagonal in plan, and with any suitable covering bottom adapted for ornamental embodiment or incorporation with the ceiling, either clear, frosted or otherwise treated for transmis* sion of light rays constructed and adapted to operate in the manner more fully hereinafter described. i
In the drawings illustrating one preferred embodiment of the invention:
Fig. 1 is a vertical sectional view through the construction showing the mounting of the diii'user;
Fig. 2 is an enlarged sectional detail view illustrating the adjustable mounting of the limiting rim for the upper edge of the bowl;
Fig. 3 is a detail view of the same construction on the line III III of Fig.` 2;
Fig. 4 is a cross section on the line IV--IV ol' Fig. 3, looking upwardly. i
In the drawings, 2 is a sheet metal coping or casing extending upwardly above and around the main cavity 3, within which are mounted the lamps providing the desired source off' light. Casing 2 as shown is iitted within the beams 4 of the ceiling construction extending thereabove in truncated cone or other desired form and terminating in an upper coping 5, providing a support for the central suspension rod 6. The latter, as shown, extends upwardly through a central hole in the lower transverse wall of the bowl A, and is connected at its upper end by its threaded terminal 7 within `a. supporting nut 8, at the lower end of a cluster socle mounting 9 for lamps B. Y
` Socket mounting 9 depends from al iXture 10 supported from the top of copmghfas shown. l
The bowl A as shown isfof a depth as to its e.
surrounding wall a sufficiently long to allow for a4 considerable range of vertical adjustinent, by means of the supporting rod 6," and the limiting stops or `flanges `1 1, mounted within: la surrounding cavity at variable distances above the lowerpla-ne of the ceiling.
For providing such limitation at varying eoV heights, either with the bowl lowered mate` rially below the ceiling suriace, or raised upwardly Asubstantially `flush therewith, as in Fig. 2, for direct downward `transmission oi light rays, the inwardly extending flanges 11 are adjustably mounted within and against the inner casing 1Q, which forms an extension of theflower wall of the main casing 2.
For such purpose flange 11 is bent inwardly I" at right angles to a verticalextension 13 of the flange having an elongated slot 14, for
adjustment with relation to a securing screw 15.` 1 l The. lat-ter, as shown, extends through a washer 16 so that, the bowl having been'removed, the several screws holding the correspending limiting devices may be` slightly loosened so as to adjustthem vertically to a the bottom, the flanges 11 will be lowered accordingly `so that when the bowl A is replaced and `supported by the central rod i6, it will be locatedi'n suchrelation, as inFig. 1.
` On the other hand, with the flanges ele-V vated, the bowl `maybe secured `upwardly with its bottom surface substantially `level with the `ceiling surface, `as inFig. 2, or at any intermediate position. i
The vertical `sliding member 13 of each flange. 11 isguided between. oppositeinwardly bent lips-171 whichiembracefthe opposite p to maintain it in proper operative position.
The finishing plates 13 are preferably extended downwardly and laterally with an ornamental border or flange 18 surrounding the dome opening and assisting in the ornamental effect.
The diameter of the bowl A is somewhat less than the receiving surrounding space for its insertion, leaving a continuous intervening surrounding space 19, for air circulation either inwardly or outwardly, and tending to prevent accumulation of dust or other foreign matter, while also facilitating a rapid application or removal of the fixture.
In addition to the advantages noted, the bowl itself may be readily removed for cleaning or renewal, and the entire construction is comparatively simple, easy of installation and highly efficient in carrying out its intended purposes.
What I claim is:
Y 1. In a lighting fixture, the combination with a ceiling construction having an inwardly extending frame surrounding a cavity provided with an upwardly extending interior casing secured tothe frame and having a source of light mounted therein, of a lower light diffusing bowl extending upwardly into the cavity, means for securing it in position, and means movably mounted on the frame within and below the casing having an arresting abutment limiting upward adjustment of the bowl.
2. In a lighting fixture, the combination with a ceiling construction having an inwardly extending frame surrounding a cavity provided with an upwardly extending interior casing secured to the frame and having a source of light mounted therein, of a lower translucent light diffusing bowl eX- tending upwardly into the cavity, means movably mounted on the frame within and below the casing having` an arresting abutment limiting the vertical location yof the bowl, and means supporting the bowl at the center.
3. In combination with the inner wall of a lamp cavity extending upwardlybeyond a ceiling surface, a bowl limiting bracket having a vertically slotted screw opening and an upper inwardly extending terminal bowlengaging flange, a securing screw extending through the slot into the cavity wall, and a translucent light diffusing bowl having a surrounding wall extending upwardly into the vcavity and engaging said flange.
4. In combination with the inner wall of a lamp cavity extending upwardly beyond a cavity walls, and a translucent light diffusing bowl having a surrounding wall extending upwardly into the cavity and engaging said flange.
In testimony whereof I hereunto affix my signature.
KENNETH R. CRUMPTON.