US1340443A - Lighting-fixture - Google Patents

Description

H. E. GLEASON.

LIGHTINGFIXTURE.

APPLICATION FILED AUGJZ, 1919.

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LIGHTING FIXTURE.

APPLICATION FlLED AUG.I2, 19x9.

1,340,443. Patented y 18,1920.

2 SHEETS- SHEET 2.

Henna n. GLEASON, or SEATTLE, WASHINGTON.

LIGHTING-FIXTURE.

Speeificationof Letters Patent.

Patented May 18, 1920.

Application filed. August 12, 1919. Serial No. 317,095.

To all whom it may concern:

i and useful Improvementin Lighting-Fix- I tures, of which the following is a specification.

My invention relates to that class of units which are termed semi-indirect units, by reason of the fact that a diffusing shield is placed around the electric bulb, thus per mitting the use of the modern high intensity electric light bulbs known as nitrogen or type C light. It is recognized in the art that the intense brilliancy of the filament of the lights when in use is such that they are very deleterious to the eyesight and numerous lighting units have been devised.

to avoid this result. Most of these are constructed with an upper reflector and a bowl suspended below, but the eficiency of these units is always considerably less in use than when new, owing to the coating of dust, which covers the reflecting surfaces and decreases their efliciency materially.

- Attempts have been made to remedy this objection by constructing an entirely inclosed unit. This, however, is not satisfactory because of the fact that the heat given ofl by the lamp, if not permitted to escape, acts very injuriously upon the filament, thus materially shortening the life of the lamp; especially is this true if the best type of reflector, 2'. 0., catoptric, is employed.

My invention has for its object to provide a constructionin which I can employ a reflector'of such shape as to illuminate a useful area and located with relation to the lamp so as to overcome the loss of illumination in foot distance and at the same time redirecting a great majority of the lumens into the useful area, and to completely inclose the lamp and reflector'in a bowl or globe of high diffusing quality, which is so shaped as to avoid all upward shadows, thus securing increased efficiency, and to also provide ventilating passages of such ample area as to enable the user to obtain the full use of the normal life of the lamp.

The principal feature of my invention is to provide a lighting unit for high powered lamps which will concentrate the light-rays in a reflector so that the light thrown there from will be multiplied in projecting Strength,'and to surround, and completely inclose, such reflector with a bowl of high diffusion quality, the bowl projecting beyond the outer periphery of the reflector so as to permit the passage of some reflected light rays upwardly, to softly illuminate the ceiling and eliminate shadows.

I desire to direct particular attention to the shape of the reflector I employ which is preferably concaved between its inner and outer peripheries so as to receive and concentrate thelight rays in a circle, above the lamp and which will project them downwardly therefrom through the diffusion bowl.

My means of accomplishing the foregoing objects may be more readily understood by having reference to the accompanying drawing, which is hereunto annexed and made a part of this specification, in which:

Figure 1 is a side elevation partly in section of my improved lighting unit.

Fig. 2 is a plan view of the same.

Figs. 3 and 4. are modified forms of the same. I

Similar reference numerals refer to similar parts throughout the entire specification.

As shown in the drawing, the unit is provided with a holder 10, in which is mounted a socket 11, which carries the lamp 12. This holder is provided with an eye 13 at its upper end to which may be secured the chain or any other convenient suspension means. A plurality of screws 14 are mounted in the holder adjacent its lowerv end; their inner ends are screwed into openings formed in the top 15 of a canopy 16. Tubular members 17 are provided intermediate the inner wall of the holder and the outer wall of the top 15 of the canopy, holding the two in spaced relation. The canopy flares outwardly and is provided with a downwardly extending peripheral flange 17 in which is mounted a plurality of bolts 18, which are adapted to engage the lip 19 of a diffusing bowl20, which is preferably formed of glass of a high diffusing quality and so shaped as to avoid the throwing of shadows upwardly. An opening 21 is provided in the bottom of the bowl at the center. An annular reflector 22 encircles the skirt of the lamp 12, this reflector being preferably made of a heavy brass spinning and so shaped as to provide a correct curve for distributing the light to the useful plane. It is heavily silver plated and is similar to the type of reflectors employed in high grade automo bile head lights. The reflector is supported from the canopy by means of screws 23 which are provided with nuts 24, the screws 23 being surrounded by sleeves 26, which serve to support the reflector in spaced relation to the canopy 16.

The reflector is so mounted as to provide an annular space 25,. intermediate its inner edge and the skirt of the lamp, and also to provide an annular space 26 intermediate its periphery and the inner wall of the lip 19 of the bowl or globe 20.

It will be apparent from the foregoing description that the annular space 25 provides for the immediate escape of the heated airupwardly, where it passes through the annular space 27, intermediate the holder 10, and the top 15 of the canopy 16. The cool air entering through the hole 21 will also circulate through the globe, become heated and pass through the passage 26,

whence it will pass upwardly and out.

through the passage 27 thus keeping the unit cool so that when it is desired to use it adjacent the ceiling, as in Fig. 2. it will meet the requirements of the underwriters.

When constructed as shown in Fig. 3 additional ventilating holes 28, may be formed in the holder 29, which is constructed so as to secure it to the standard outlet or junction box. y

In Fig. 4. the holder is omitted and the canopy itself is secured to a standard 2g" holder 30, which is carried by the socket 31 in the usual manner. It will be apparent to persons skilled inthe art that a unit constructed in this manner accomplishes the objects hereinbefore set forth, and that the accumulation of dust, dirt, etc., upon the reflecting surface of the unit is effectuallyprevented, while the use of the silverplated reflector increases the efiiciency of the unit materially. v

Having described my invention what I regard as new and desire to secure by Letters Patent of the United States is:

1. The'combination in a lighting fixture of a flared canopy, means to support said canopy, an electric lamp socket in spaced. relation to said canopy, an electric lamp mounted in said socket, abowl having a complete diffusion surface of high efliciency supported by said canopy and inclosing said lamp, an annular reflector carried by said canopy, there being an annular passage intermediate the skirt of the lamp and the reand outer peripheries, said peripheries being on substantially the same plane inclosed in a difi'usionbowl of greater diameterthan the reflector, to permit the passage of some its light rays upwardly, said reflector being adapted to redirect the rays of light impinging thereon downwardly through the diffusion bowln In testimony whereof I have signed the

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