US1654150A - Illuminating appliance - Google Patents

Description

Dec. 27, 1927 W0 W0 THOMPSON ILLUMINA'IING APPLIANCE Filed July 16 urn/f ATTORNEY Patented Dec. 27, 1927.

uurrso STATES PATENTOFFICE.

"llflILlItlllltD 'W. THOMPSON, OF DORCHEETER, MAHSAHHUSETTS, .ASSIGIllOR, BY MESNE lltlZ'lfiTGFNIITENTQ, TO HOLOPHAJEJ'E C01VIIl?.lltNY, Illlltl, OF NEW YQRK, N. Y., A. GORPORA- fllllfllll ()1? NEW YORK.

ILLl'Ill/IIINATING APPLIANCE.

Application filed July 16, 1923. Serial No. 651,838.

The object of my invention is the con struction of an illuminating applial'lce prelcrably tor use in the sick room of a hospi tal. The fixture is constructed to give a well-distributed, cheerful light of normal intensity, and also has a second source oiillumination of low intensity to be used when the normal light is not desired. The unit has a low surface brilliancy and is free from 1.0 shadows and distortions when either the nornull or low intensity lamps are burning.

Figure 1 is a vertical cross section otan illuminating appliance embodying the liealures Of my invention.

Figure 2 is a cross-sectional View oi the preferred :lt'orm ol the socket cover employed in the device.

lln the :liiguro, 1 is the ampliancc, in. which 5.2 i the canopy, preferably smooth and tree from wiwolutions. 3:3 is a pipe or stem and l: is a holder l" .d directly into the stem and adapted to support a glass enclosure 5,

which. enclosure is oil? dill'using glass and preferably completely encloses the source of illumination 6. This light source comprises a pipe or stem 7 which is threaded at its upper end to the upper plpe 3 by means of a coupling 8 and the lower end of stem 1' is also threaded to a smooth :[laring socket on cover 9 containing receptacles for three lamps. The socket cover 9 is provided with a bottom plate lelcontaininga large central aperture 115 and smaller apertures 16.

t locltel; corer ll is also provided with two soclret supporting brackets 18 which. are in tea-rel. with bottom plate 14;. The upstand inf; walls of brackets TF are drilled and tapped to receive screws 1?) which act to secure the bottom plate to the socket cover.

tllcrews 17 are enu loyed to secure socket ill to the bottom plate 14; through holes 17. A

central lamp 10 of usual voltage, say of 75 watts, is fitted into the central receptacle l1 and two small lan'lps 12 of extremely low candle power, for instance of 4 candle power are fitted into candelabra receptacles 13, for purposes hereinafter described.

Attention is called to the position of the large lamp, which is so placed that the surlace brightness oi? the enclosing globe substantially even, when the large lamp 1s illuminated, while the position of the two auxiliary lamps combined with their low intrinsic brilliancy will render the surface l ll of the globe dimly but evenly lit when the large lamp is not in use and the small lamps are turned on.

The appliance is particularly adapted for the wards or corridors of hospitals because the central lamp will give ample illumination for all general purposes, while at night where general illumination is not required the small candle power lamps will indicate the position of the light sources and furnish a guide to the attendants 01 the position of the objects around the room. At the same time the patients will be in con'lparative darkness and undisturbed by the artificial light when the small candle power lamps are burning, as the low brilliantly evenly spread over the sin-face of the globe can be practically ignored.

7 :5 designed hitherto to serre in this dual capacity have sometimes been provided with a lamp which contains two filaments, but the life ol? the smaller, more delicate filament n-oportiomrtely shortened because of its being subjectto extreme heat while the larger lamp is burning. In cases where resistance is employed to effect a dimming of the lamp other drawbacks are encounterod.

The appliance shown in the drawing is the result of considerable study to meet the particular requirements. This fixture has a smooth flaring canopy, globe holder and stem all designed to minimize the collection of dust and to facilitate cleaning. The bot tom plate on the socket cover renders it dustproo'l as well. The socket holder is designed to support the sockets and lamp in the correct position to obtain the desired results in distrllnltion and intensity. The low inten' sity lamps are located in the socket holder which. is constructeiil to eliminate shadows or distortion from the globe when the normal or low intensity lights are illuminated. Although the secondary sources are in the position shown the various light rays appear to come from a single source inside the globe.

It will be noted that the diffusing globe extends above and below the lamp, that it is of the shape to direct lightboth upwardly and downwardly so as to illuminate the entire room, and that no shadows will be produced on the ceiling.

I claim:

1. A lighting fixture comprising a canopy,

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with a smooth extension stem the globe and fitted with a smooth socket cover constructed to contain a plurality of receptacles and adapted to contain lamps of various sizes to secure even illumination of different degrees and substantially even sur face brightness when the diil'oreut lamps are illuminated, the dill'using globe extending above and below the lamps so as to direct light upwardly and downwardly.

Signed at Boston, in the county ol? Suffolk and State of lllassachusctts, this 13th day of July, 1923.

\VILLARD \V. THOMPSON.

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