US2199985A

US2199985A - Desk lamp

Info

Publication number: US2199985A
Application number: US197649A
Authority: US
Inventors: Craib Fred
Original assignee: Individual
Current assignee: Individual
Priority date: 1938-03-23
Filing date: 1938-03-23
Publication date: 1940-05-07
Anticipated expiration: 1957-05-07

Description

DESK LAMP Filed March 23, 1938 2 Sheets-Sheet 1 Ebl. H

I N V EN TOR. FRED GXQA A RNEYS.

May 7, 1940. cRAlB 2,199,985

DESK LAMP Filed March 23, 1938 2 Sheets-Sheet 2 INVENTOR. FRED CEA /5 BY WNW WATTORNEYS.

Patented May 7,

QDEs'K LAMP 3 Claims.

inventionrefers to reading lamps and more particularly'to a reading lamp having a circular reflector with auxiliary means for producing an asymmetrical'light pattern therefrom.

Symmetrical reading lamps having a central upright lamp support and a circular reflector mounted thereon are often used for'desks' and the like and the lamp is usually positioned on one side of'the' desk. Much of the light emitted by the lamp is, therefore, not utilized, being dispersed over the edge of the desk. 1

The main object of my invention is to provide a reading lamp having a conical reflector mounted on a central support wherein an asymmetrical light pattern is obtained, whereby the light may be projected across the desk and whereby a greater portion of the light emitted by the lamp is utilized.

Other objects of my invention will be apparent or will be specifically pointed out in the description forming a. part of this specification, but I do not limit myself to the embodiment of the invention herein described, as various forms may be adopted within the scope of the claims.

Other broad objects of my invention may be more fully understood by direct reference to the drawings, wherein:

Figure 1 is a longitudinal sectional view, having portions thereof in elevation, of a reading lamp embodying my invention.

Figure 2 is a partial sectional view, partly in elevation and partly in section, of another modification of my invention.

Figure 3 is a perspective view looking down on the top of the lamp shown in Figure 2 with the reflector removed.

Referring directly to the drawings:

In Figure 1 a lamp base I is provided in the usual manner with a base collar 2 and a central standard 3, held together as is customary in the art by a central hollow rod 4 fastened to the base I by nut 5. The upper end of rod 4 is provided with an upper nut 5, supporting a. lamp sleeve I and a lamp socket 8 inside sleeve I. The customary incandescent lamp 9 is positioned in socket 8.

Clamped between sleeve 1 and central standard 3 is a bracket III extending laterally and upwardly to avoid the lamp. The bracket I carries an arm II, removably ailixed thereto and locked by means of a thumb screw I2 and maintained from turning by bracket pin I2. The arm II is bent toward the axis of the lamp and terminates in a screw I4, positioned in line with the axis of central standard 3.

'rectly.

g 1 Fred Craib, Martine z,0alif.

- Application March 23, 1938, Serial No. 197,649 (Cl. 240- 81) The screw I4 has placed thereover a main reflector I 5, which is roughly conical and has a circular rim, thus making the entire reflector I concentric with central standard 3 and base I.

I The reflector I5 is held by a nut I 6.

I prefer to drop rim I l of main reflector I5 below the open end I9 of sleeve I, in order that the user of the desk may not see the lamp di- Considering the structure so far described, the lamp in use would have a symmetrical light pattern and, if the lamp were to be used on the edge of a desk, for example, a portion of the light away from the user of the desk would be wasted. In order to prevent such waste of light, I provide, immediately around lamp 9, an auxiliary reflector placed to one side of the lamp and directing light to the opposite side of reflector I5, the axis of the auxiliary reflector and of the light beam projected thereby being substantially parallel to the slope of the main reflector. Thus the maximum of light may be directed toward the person using the desk and across the desk surace.

In the modification shown in Figure 2, I utilize two lamps. Here the central rod 4 is extended upwardly along the axis of the central column 3 and terminates in a screw I4, and reflector I5 is mounted directly on this screw. No lamp bracket I0 is needed, but in this case two arms 2| are provided extending from central rod 4 and supporting auxiliary reflectors 22. In this case the angle of the auxiliary reflector is made the same as when a single reflector is utilized. Sleeves I are placed on an angle and mounted on a sleeve tube 24, forming a continuation of the central standard 3.

As is customary in the art, a hickey 26 is positioned at this point, in order to allow distribution oflamp wires 25. In like manner the base of central rod 4 is provided with a basal hickey 21, and the lamp wires run through the central rod 4, to emerge through basal hickey 21, pass to switch 28, and thence to lamp cord 29.

The lamps are easily replaced: In the case of the modification in Figure 1, thumb screw lock I2 is removed, thus allowing removal of the arm I I. Lamp bulb 9 may then be removed or replaced and the arm ll be replaced in proper position.

In the modification shown in Fig 2 and 3, removal or replacement of bulbs 9 is easily acli hed by making the arms 2i of resilient material. Reflectors 22 may, therefore, be

terminating in an open sleeve, a lamp socket in' said open sleeve, a lamp in said socket, a reflector support extending upwardly from said upright below said lamp socket and including a detachable section extending upwardly around said lamp to terminate above said lamp in line with the axis of said upright, a substantially conical main reflector centrally mounted on the terminus of the detachable section of said reflector support and extending downwardly around said lamp with the rim of said reflector being below the level of the open end of said sleeve, and an auxiliary reflector on said detachable section of said reflector support and positioned around said lamp adjacent-thereto and reflecting light from said lamp to one side of said main reflector.

2. A reading lamp or the like comprising a base, an upright extending from said base and terminating in an open sleeve, a lamp'socket in said open sleeve, a lamp in said socket, a reflector support extending upwardly from said upright below said lamp socket and including a section detachably secured thereto by a thumbscrew and extending upwardly around saidlamp to terminate above said lamp in line with the axis of said upright, a substantially conical main reflector centrally mounted on the terminus of. the detachable section of said reflector support and extending downwardly around said lamp with the rim of said reflector being below the level of the. open' end of said sleeve, and an auxiliary reflector attached tov said detachable section of said reflector support at a point intermediate the ends thereof and partially surrounding said lamp and with the axis of said auxiliary reflector substane tially parallel with the slope of the main reflector. 3. Apparatus as recited in claim 1 wherein the detachable section of the reflector support carrying the auxiliary and main reflectors is se: cured to the remainder of the support by a thumbscrew to facilitate lamp replacement, and is rigidly retained against turning by a pin secured to one of the portions of the reflector supportand engaging the other portion.

FRED CRAIB.