US2082687A - Lighting unit - Google Patents

Description

June 1, 1937. A. F. H. DAVIS 2,082,687

LIGHTING UNIT Filed Dec. 10, 1936 3 Sheets-Sheet l INVENTOR.

k 145mm fin-Tween bQ-w/ 0 W5 ATTORNEY.

June 1, 1937. I DAVIS 2,082,687

LIGHTING UNIT Filed Dec. 10, 1936 3 SheetsSheet 2 F'IG.3

- INVENTOR. 145N639 fisfirwaoa flax 2y Dav/5 BY JQLW Q, W

ATTORNEY.

June 1, 1937. A. F. H. DAVIS LIGHTING UNIT Filed Dec. 10, 1936 3 Sheets-Sheet 3 F'lG.4

. INVENTOR. lam-e flszrwoaa /7'ENRY fin v/s Ul/WZ 2m Patented June 1, 1937' puns!) STATES PATENT OFFICE LIGHTING UNIT Application December 10, 1936, Serial No. 115.116

6 (Claims.

My invention has for its principal objectto provide a, lighting unit which will spray the light rays, emitted by a source of light such as an electric bulb, over a fan-shaped area on -a desk or table with a high degree of emciency.

A further object is to provide a construction which will shield the light source entirely from the eye of a person seated at a desk or table, while at the same time, redirecting the light rays over the said fan-shaped area in a highly efflcient manner.

A further object is to provide one or more supplemental and redirecting reflectors where a greater degree of intensity is desired.

My means of accomplishing the foregoing ob- J'ects may be more fully comprehended by have ing reference to the accompanying drawings, which are hereunto annexed and are a part of this specification in which:

20, Fig. l is a side view of my invention applied to a portable or table lamp, portions of the structure being shown in section;

Fig. 2 is a fragmentary detail view showing the manner of supporting an auxiliary reflector;

25 Fig. 3 is a view similar to Fig. 1 showing different forms of supplemental reflectors.

Fig. 4 is a, top plan view of Fig. 1 showing diagrammatically the contour of the light raysas they strike the top of a desk.

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

For the purpose of illustration, I have shown my invention in connection with a portable or table lamp, but this is solely to shows. concrete 3 embodiment of my invention, for I do not wish to be understood as limiting myself in any particular to the specific structures shown and described, for many changes may be made in the application and use of my invention regardless of 40 the manner in which the light source is supported.

As shown in the drawings, a light source I is mounted in a socket 2 carried by a tube 3 through which the electric conductors (not shown) may I .1 be carried to the socket in the usual manner. The socket is enclosed in a cylindrical casing or pedestal 4 which is mounted upon a base 5 in the interior of which is a metal weight 6 which operates to maintain the lamp in proper 50 position. The weight is held in place by means of a nut I mounted upon the lower end. of the tube 3.

The casing l is flared outwardly adjacent the skirt of the lamp I as at 8. Inside of the flared 55 portion 8 of the casing 4, I may provide a supplemental reflector. 9 which receives the light rays from the source and directs them upwardly so that they-will impinge upon a reflecting surface of a concave reflector member ID, of larger diameter than the reflector 9, the center of the 5 concave member l0 being eccentric to the-center of the light source. The reflector I0 is carried by a reflector tube II which extends around its exterior as clearly seen in Fig. 1,

its lower end being secured in position to lo the casing 4. This supplemental reflector 9 is held in place by means of a stud 12 mounted in the end l3 of the reflector tube II, a nut l4 serving to hold the supplemental reflector 9 firmly in position. 15

As clearly shown in the drawings, reflector i0 is a surface of revolution generated about its axis, said axis being parallel to the axis of the smaller reflector and falling outside said reflector. It is obvious however that the surface of the reflector may be somewhat modified to give it a more ornamental appearance without departing; from the spirit of the invention.

Ventilating openings l5 and it are provided in the casing 4, as shown, they are two in number though it should be perfectly obvious that any number requisite to provide perfect ventilation may be employed. A similar vent I1 is formed adjacent the lower end of the reflector tube II.

It will be apparent from the foregoing description that the direct rays emitted upwardly from the source will strike the concave reflecting surface of the member In whence they will be reflected, and redirected as clearly indicated by Y the arrows shown in the drawings. The other rays emitted by the source will impinge upon the supplemental reflector 9 from which they will be reflected onto the reflecting surface of the concave reflector member ID where they will be re-reflected and redirected as indicated by the arrows.

The result of this construction is that the light rays as clearly shown by the arrows in Fig. 4, are spread out upon the desk or table 29 over a fan-shaped area in the front of the lamp and by making. the reflecting surface of the concave reflector l0 and of the supplemental reflector 9 of the most efficient quality, a very high degree of efficiency is attained and a very satisfactory illumination of the fan-shaped area in front of the lamp follows.

It may, in some cases, be found desirable to furnish a redirecting reflector iii. In the drawings I have shown such a reflector i8 secured to two arms 19 and 20 of a U-shaped member,

the connecting portion 2| of which is attached to the casing 4 by means of rivets 22, or in any be found desirable.

' by a coil spring 24 which is coiled around the skirt of the lamp or the reflecting surface may be on the lamp bulb itself or the reflector- 23' may be entirely omitted and the inner surface 25 of the flared portion 8 may be provided with a coating of suitable reflecting material.

It may, in some instances, be found desirable to provide a separate reflector 26 mounted inside of the concave member Hi. When this is done, obviously the concave member ID will not have its inner surface coated with reflecting material. This construction has the added feature, of providing for a space intermediate the concave member l0 and the reflector 26 which can be utilized for ventilating purposes which will aid in keeping the concave member I ll cool.

It will be apparent from the foregoing description, that owingto the fact that the perimeter 21 of the concave reflecting member I0 extends below the upper edge 28 of the flared portion 8 of the casing 4 that it is impossible for any direct rays of light to strike the eye of the observer or of a person seated at the desk, while by mounting the concave reflector eccentric to the center of the light source, as clearly seen in the drawings, I am able to provide for the 11- lumination of a fan-shaped area directly in front of the lamp. In this manner, I obtain a high degree of eye comfort without a corresponding loss in lumens due to absorption in shields commonly employed for this purpose.

Having described my invention, what I regard as new and desire to secure by Letters Patent is:

1. A stand lamp comprising a pedestal, a light source at the top thereof, a'reflector surrounding said light source to direct the lightrays upwardly, an upper concave reflector separate from and of larger diameter than the first said reflector supported above the light source and smaller reflector so as to receive the upwardly directed light rays and project them fan-shaped at one side of the pedestal, said'upper reflector being constructed substantially as a surface of revolution generated about its axis with said axis positioned substantially parallel to the axis ofthe smaller reflector and to one side thereof.

2. A stand lamp comprising a pedestal, a light source at the top thereof, a reflector surrounding said light source to direct the light rays upwardly, an upper concave reflector of larger diameter than the first said reflector supported above the light source and smaller reflector so as to receive the upwardly directed light rays and project them fan-shaped at one side of. the pedestal, said upper reflector being constructed substantially as a surface of revolution generated about its axis with said axis positioned substantially parallel to the axis of the smaller reflector and to one side thereof, said upper reflector having a'lower edge extending below the upper edge of the smaller reflector.

3. A stand lamp comprising a pedestal, a light source at the top thereof, a reflector surrounding said light source to direct the light rays upwardly, an upper concave reflector of larger diameter than the first said reflector supported above the light source and smaller reflector so as .to receive the upwardly directed light rays and project them fan shaped at one side of the pedestal, said upper reflector being constructed substantially as a surface of revolution generated about its axis with said axis positioned substantially parallel to the axis of the smaller reflector and to one side thereof and a tube secured to the pedestal adjacent the smaller reflector to support the larger reflector, there being ventilating apertures in said pedestal and tube to cool said reflectors.

4. A stand lamp comprising a pedestal, a light source at the top thereof, a reflector surrounding said light source to direct the light rays upwardly, an upper concave reflector separate from and of larger diameter than the first said reflector supported above the light source and smaller reflector so as to receive the upwardly directed light rays and project them fan-shaped at one side of the pedestal, said upper reflector being constructed substantially as a surface of revolution generated about its axis with said axis positioned substantially parallel to the axis of the smaller reflector and to one side thereof, the

eccentrically mounted peripheries of the two reflectors being substantially aligned at one point. 5. A stand lamp comprising a pedestal, a light source at the top thereof, a reflector surrounding said light source to direct the light rays upward- 1y. an upper concave reflector of larger diameter than the first said reflector supported above the light source and smaller reflector so as to receive the upwardly directed light rays and project them fan-shaped at one side of the pedestal, said upper reflector being constructed substantially as a surface of revolution generated about its axis with said axis positioned substantially parallel to the axis of the smaller reflector and to one side thereof, and a redirecting reflector secured to the pedestal below the smaller reflector to redirect reflected rays on to the illuminated area atone side of the pedestal.

6. A stand lamp comprising a pedestal casing, a socket mounted in said casing, a source of light in said socket, said casing having an upwardly and outwardly flaring reflector which surrounds said light source, a weighted base for said casing, a concave reflector mounted above said light source, the perimeter of which extends below the upper edge of the flaring reflector, the axis of said concave reflector being parallel to the axis of the flaring reflector and substantially outside thereof, a tube for supporting said'concave reflector and secured to said casing, there being ventilating apertures in said tube and casing, and a redirecting reflector secured to the outside of said casing below the flaring reflector.

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