US1146935A - Lighting-fixture. - Google Patents

Description

E. F. GUTH. LIGHTING FIXTURE. APPLICATION FILED NOV-. 14. 1914.

Patented 20, 1915.

WI TJVE SSE S one.

EDWIN F. GUTH, OF ST. LOUIS, MISSOURI.

LIGHTING-FIXTURE.

Specification of Letters Patent.

Patented July 20, 191 5.

Application filed November 14, 1914. Serial N 0. 872,060.

'souri, have invented a certain new and useful Llghting-Flxture, of which the follow-.

ing is such a full, clear, and exact description as will enable any one skilled in the art to which it appertains to make and use the same, reference be1ng had to the accompanylng drawlngs, forming part of this specification.

My invention relates to light controlling device or fixture designed to operate on a principle similar to that of the fixture described in my United States Patent No.

I 1,076,418, its object being to approximate the lighting effects of what is known as indirect lighting and also to utilize the light produced by the lamp more eliiciently than is possible in an indirect lighting system, while,- at the same time, eliminating direct rays of light from the working plane or space where light is desired.

()ne object of the invention is to provide a device for the general purpose described which shall be very simple in construction and low in cost.

. Another object is to provide means where by the heat produced by the lamp may be sufiiciently dissipated and the temperature within the fixture kept within proper limits, means for dissipating heat being particularly necessary in connection with electric lights operating in nitrogen, argon, or' other ases.

A still further object is to so arrange the ventilating means as to avoid accumulation of dust within the fixture.

In the accompanying drawings, which illustrate one embodiment of my invention, Figure 1 is a side view, partly in section and partly in elevation, and Fig. 2 is a bottom plan view.

1 designates a translucent glass bowl surrou ding a source of light 2 and provided with an integral top 3. An opening. 4 in this top is of sufficient size to permit the insertion of the light source 2 and is closed after the insertion of the light by means of a suitable cover plate or member 5 which may also serve as a support for the bowl and for the light source. The top 3 is i so constructed as to aiiord a good refleeting surface for the light passing upward from the source, this reflecting surface being preferablyv flat. I prefer to so construct this top of glass or other suitable material that although the greater part of the light will be reflected downwardly thereby, a small portion of it may pass through the top and toward the upper part of the room to be lighted. To secure the last named result, the top may be constructed of what is known as opal glass. i

The upper portion'of the bowl'is preferably flared as shown and spaced ventilating openlngs 6 are made in this flared portion and a ventilating opening 7 is provided in the lower portion of the bowl. With this arrangement of openings, the heat of the lamp causes circulation of air through the fixture and the position of the openings 6 is such that dust or other foreign material cannot fall into them.

It will be noted that with the construction described, practically all the rays of light passing upwardly from the source will be directed downwardly and distributed and that the light passing downwardly will be diffusedby the translucent bowl with the result that the entire working plane beneath the fixture will be evenly lighted with a soft pleasing light, and, further, that practically all of the light will be directed toward this working plane and thus most eflicient use made of the light produced. The small amount of light passing through the upper portion of the bowl in the preferred formv of construction is suflicient to prevent formation of shadows on the ceiling of the room.

Since it is possible to make the bowl and upper reflecting surface of glass in one piece, the cost of construction is relatively Having fully described my invention, what I claim as new and desire to secure by Letters-Patent of the United States is:

1. A light controlling device comprising a translucent glass bowl having an integral' bowl being provided withspacedopenings near its top and 'an opening inthe bottom.

,10j portion of said. bowl being flared and pro- 4. A lighting fixture comprising a light "difl'using'bowl havingan integral glass top provided with acentral opening the upper vided with spaced entilating openingsin said upper portion, a sourceof light within the bowl, meansyfor supporting the bowl from the top,fisaid means also forming a support-for the light and a: cover for" the opening the top ofthe bowl.

5.. A light controlling device comprising a translucent glass bowl having an integral opal glass top provided. witha substantially copies ot'this patent' inafjr-be obtainedfor fiat reflecting surface and having a central opening for the insertion of 'a source of light, bowl supporting means attached to said top, the upper portion of the bowl being flared andprovided with spaced ventilating openings ,in said flared portion and .anopening in the bottom.

6 A light-controlling device comprising a translucent, bowl having a top provided with a reflecting surface, the upper part of the bowl being flared and provided with entilating openings in the flared portion.

- Intestiinony whereof, I have hereunto set my hand and affixed my seal in the presence of the ,two subscribing witnesses.

EDlVIN F. GUTH. [1,. s.]

Wptnesses W. A. ALExANoEk,

G. M. SHORE.

five centseac by addressing the Commissioner of intents, Washington). 0.

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