US1994300A - Illuminating device - Google Patents

Description

. @htenteci Mar. 12, 1935 STATES PATENT QFFICE ILLUMINATING DEVICE Cornelis Bol, Einclboven, Netherlands: assignor to General Electric Company, a corporation of The present New York Application September 8, 1933, Serial No. 688,663

In Germany September 27, 1932 1 Claim.

invention relates to illuminating devices generally and more particularly the invention relates to such devices in which a gaseous electric discharge lamp requiring-a trans- 5 former is the light source. v

The object of the invention is to provide a compact, easily assembledlamp unit comprising.

a gaseous electric discharge lamp device and a transformer for said device and a lamp unit of such construction that the parts thereof are separately and easily removable therefrom. A

further object of the invention is to provide such av lamp unit which is easily incorporated in reflectors n ow used. for incandescent lamps.

Still further objects and advantages attaching --to the'device and to its use and operation will be apparent to followin parti In accordance with these objects the new and novel lamp unit comprises a support forthe gaseous electric discharge lamp device and for the transformer of accommodates I eous atmosphe izable material those skilled in the art from the cular description.

-said lamp. Said support likewise a heat conservator for said lamp sary for some types of discharge particularly those having a gasre comprising a difficulty-vapor:-

, such as sodium. The lamp and the'heat conservator therefor are separately and easily removed from said support. The support and the transformer are enclosed by a housing which is removable from the lampunit without disturbing the lamp'device or the heat. conservator and the lamp device and the heat conservator project from the housing. Said housing is provided with ventilating means andv baflles so that the elements, or parts of the elements, of

the lamp unit enclosed therein do not attain a harmful temperature during the operation of the lamp device.

The invention will be readily understood by an inspection of the drawing accompanying and forming part of this specification and a perusal of the following detailed description thereof.

Fig. 1 of the drawing is a front 'elevational,

partly sectiona unit,

of Fig. 1, and

Fig. 3 a side 1 view of the new and novel lamp the line 2-2 elevational view of the new and novel lamp unit mounted on a support and-in a reflector said reflector being shown in section.

Like numbers denote like partsin all the figures.

Referring to Figs. 1 and 2 the new and novel .consists of heat insulating material, such as lamp unit comprises a transformer 1'1 mounted on two support-strips T2. Said support-strips 2 are attached to the part 1 which is the top of the housing and which has an opening 19 therein to accommodate the current cable 20 which 5 is connected to the transformer 1'7 and to accommodate support means for the lamp unit.

A plate 3 of insulation material,-such as hardrubber' or asbestos; provided with plug-contacts 4, is attached to said support strips 2. Said 10 plug-contacts 4 areelectrically connected to the transformer 1'7 by suitable current leads. The contacts 4 accommodate the prongs of the base 8 of the gaseous electric discharge lamp device 9. Said lamp 9 comprises a cathode which is electron emitting when heated and two anodes (not shown for purposes of simplicity) and has a gaseous atmosphere therein'comprising a rare gas and a metal vapor, such as neon and sodium vapor, and is similar in structure to the lamp device disclosed in my German Application Number 34, 20, filed in Germany September 26, 1932 which corresponds to my United States Patent Number 1,951,124, March 13,1934. It is desirable in this type of lamp device that the radiation of heat from the container of said lamp device be reduced to a minimum to maintain an effective vapor pressure therein during the operation thereof and a heat conservator is provided for this purpose. The heat conservatorillustrated in the drawing is a double-walled jacket 6 and the space between the walls of said jacket is evacuated, whendesired, but it will be understood of course, that I contemplate the use of other types of heat conservators in the lamp'unit. Said jacket '6 is y provided with a bayonet base 21 which slips over and is supported by-the plate 5.- Said plate 5 hard-rubber or asbestos, and is supported by rods 7 attached to said supports 2. The heat insulating plate 5 reduces the transfer of heat from the lamp 9 to the transformer 1'7 to a minimum and the plate '3 serves as a battle for this purpose. The base 8 passes through and extends beyond the plate 5 and the space between said lamp .9 and the conservator 6 is closed by a r n 10 comprising a circular, coiled metal spring embedded in heat insulation material, such as asbestos. Said ring 10 also serves to protect the 50 transformer 17 from the heat of said lamp 9. The stembf the container of the lamp 9 is located in the elongated base 8 and out of the space enclosed by said ring 10 and said jacket 6 so that said stem part is cooler than the other 55 parts of the container, of the lamp 9 which avoids cracking at said stem part. When desired the base 8 is provided with ventilating means, such as openings 20, for this purpose all as disclosed in my patent referred to heretofore.

The housing 11 for-said transformer 17 is attached to said cover 1 by means of screws 12 and is easily removable therefrom. An annular slot is present between the overlapping parts of said housing 11 and said cover 1 for ventilating the interior of said housing 11'. The lower end of said housing 11 is skirted and is partly closed by a cap 13. triangular rods 14 inserted in a clamp comprising the part 16 and the set screw 15 as shown in Fig. 2 of the drawing. Said cap 13 is separated from the outer wall of the jacket 6 to avoid the direct transference of heat from said jacket. 6 to said cap 13 and to provide ventilation for the parts enclosed in said housing 11. When the cap 13 is made of heat insulating material, such as hard rubber, this separation may be present, or not, as desired.

The above described lamp unit is compact, easily assembled and the 'parts'thereof, such as the jacket 6, the lamp 9, the cap 13 and the housing 11 are separately and easily inserted into and. removed from said lamp unit which is of great advantage in inspecting, cleaning or repairing the transformer 1'7, the lamp 9 and the jacket 6, particularly where the lamp unit is located in difficulty accessible places, such as high poles. The housing 11 is removable from the lamp unit without removing the lamp'9 or Said cap 13 is supported by the jacket 6. The transformer 17, which furnishes the heating currentfor the thermionic cathode of said lamp 9,01 the operating current for said lamp 9 or both, as desired, is protected from the weather and dirt by said housing 11. The lamp unit is easily mounted on a support rod 25 and in a parabolic reflector 18 (Fig. 3) which is advantageous in street lighting, beacon work or the like. The lamp unit is mounted on support 25 by inserting holding means in the opening 19.

What I claim as new and desire to secure by Letters Patent of the United States is:-

A lamp unit comprising in combination, a gaseous electric discharge lamp device having a stem located in a perforated base, a heat conservator therefor, a resilient ring of heat insulinsulating ring, the housing part of said housingsupport', said lamp and-said heat conservator being separately removable from. said lamp unit, said base being located in said ventilated housing-support and said ring being adjacent the joint between said base and said device.

Q CORNELIS BOL.

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