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Publication numberUS2245782 A
Publication typeGrant
Publication dateJun 17, 1941
Filing dateDec 8, 1936
Priority dateDec 8, 1936
Publication numberUS 2245782 A, US 2245782A, US-A-2245782, US2245782 A, US2245782A
InventorsHolloway Gilbert C
Original AssigneeWestinghouse Electric & Mfg Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Metallic bulb lamp
US 2245782 A
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Description  (OCR text may contain errors)

June '17, 1941. G, OLL AY 2,245,782

' METALLIC BULB LAMP Filed Dec. 8, 1936 2 Sheets-Sheet 1 INVENTOR 6. c. #0110/1 4).

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ATTO R N EY June 17, 1941. c OW 2,245,782

METALLI C BULB LAMP Filed Dec. 8, 1936 2 Sheets-Sheet 2 ATTORNEY Patented June 17, 1941 METALLIC BULB LAMP Gilbert 0. Holloway, Bloomfield, N. J., assignor to Westinghouse Electric & Manufacturing Company, East Pittsburgh, Pa., a corporation of Pennsylvania Application December 8, 1936, Serial No. 114,746

16 Claims.

This invention relates to incandescent electric lamps and more particularly to such in which each has a glass window or lens in a metal body that may be in the form of a parabolic reflector.

In constructing lamps for projection purposes, such as automobile headlight lamps, it is extremely desirable that the filament be of the concentrated variety and so positioned that when the lamp is mounted, the filament will be centered or disposed at the focus of the associated reflector. In most lamps, for such a purpose, the filament is disposed in a predetermined relation with respect to the lamp base, so that when the base is normally disposed with respect to a reflector or the like, the filament will be in proper position.

In accordance with my invention I propose to construct a lamp, adapted for projection purposes such as for automobile headlights, in which the filament is positioned during the course of manufacture at the focus of the reflector, the reflector itself being incorporated as a part of the bulb.

It will therefore be seen that it is one of the objects of my invention to produce an incandescent electric lamp having a bulb formed of a metallic reflector portion and a transparent window portion sealed thereto, with a concentrated filament centered with respect to said reflector portion and sealed in said bulb.

Another object of my invention is the provision of an incandescent electric lamp suitable for projection purposes and consisting, in the main, of metal parts which may be assembled by highspeed welding.

A further object of my invention is the provision of an incandescent electric lamp comprising a mount including a concentrated filament, flanges adapted to be welded to a lamp bulb, and an exhaust tube portion which may be closed by welding.

A still further object of my invention is the manufacture of a high eiflciency lamp for projection purposes, including a reflector which is sealed in the bulb so that it cannot become tarnished or dirty, and a concentrated filament centered with respect to said reflector during the course of manufacture.

Other objects and advantages of the invention, relating to the particular arrangement and construction of the various parts, will become apparent as the description proceeds.

Referring to the drawings illustrating my invention, the scope whereof is defined by the appended claims:

Fig. 1 is an axial sectional view of one form of lamp embodying my invention.

Fig. 2 is a fragmentary view of the lamp on the line 11-11 of Fig. 1, looking in the direction of the arrows.

Fig. 3 is a view corresponding to Fig. 1, but showing the parts of the lamp separated from one another, with portions in elevation.

Fig. 4 is an elevational-view illustrating another embodiment of my invention.

Fig.5 is a view corresponding to Fig. 1, but showing a modification.

Fig. 6 is a bottom plan view of the embodiment of Fig. 5.

Fig. 7 is an elevational view, partly an axial section, of a flashlight incorporating a lamp in accordance with Figs, 5 and 6.

Fig. 8 is an axial sectional view of a further embodiment of my invention, portions being shown in elevation.

'Referring to the drawings in detail, like parts being designated by like reference characters, and first considering the embodiment of my invention illustrated in Figs. 1, 2, and 3, there is shown a lamp in comprising a bulb ll formed generally of two parts; that is, a cup-shaped reflector portion l2, desirably composed of metal, and a relatively flat transparent window or lens portion l3 desirably formed of glass. The edge of the lens or window portion I3 is shown secured, as by fusion, to a rim portion I4, formed of Kovar," for example, or other metal having a coeflicient of expansion corresponding with that of the glass used, and therefore sealable thereto. The rim portion I4 is, in turn, secured to the outer peripheral portion of the reflector portion 12 in any desired manner, for example, by welding, as indicated at l5.

The bulb II has sealed thereinto a concentrated filament I6 desirably forming part of a mount H, the body portion of which may be a metal disc ill with its outer peripheral portion flanged as indicated at l9, and telescoped with respect to corresponding flange portion 20 of the reflector I2, which defines a central filamentreceiving opening 2|.

' The filament may be supported from the metal disc l8 by leads 22 and 23, the lead 22 being desirably welded to the disc [8, and thereby electrically connected thereto, and the lead 23 desirably passing through a glass bead or other insulating portion 24 closing an aperture 25 in said disc I8. The disc [8 desirably carries an exhaust tube 26 which may be formed of metal as part of said disc, or of glass or other suitable material, as desired.

A base 21, which may be of generally usual construction and comprisea metal shell 28 and an insulating portion 29 of glass or the like carrying a central conductive contact 30, may be employed. The metal shell 28 desirably carries one or more lamp securing lugs 3| of usual form and telescopes with respect to the flange 20 of the reflector I 2.

In assembling the parts of the lamp I0, the lens I3 is sealed with respect to the reflector I 2, the mount ll positioned as shown in Fig. 1, and welded or otherwise sealed to the flange 20 of the reflector l2, as indicated at 32, in such position that the center of the filament corresponds with the focal point of the preferably parabolic reflector [2.

On account of this method of manufacture it will be clear that the filament is readily positioned in the proper location as the lamp is being manufactured, so that there is no possibility that it will be be misplaced with respect to the reflector during the life of the lamp. This is a distinctive feature of the present lamp in that there is no essential predetermined relation between the base and the filament, but rather between the reflector and the filament, which is the ultimate objective of precision basing.

After sealing the amount with respect to the reflector portion of the bulb ll, exhausting by means of the tube 26, and tipping-01f as indicated at 33, the lead 23 is drawn through the tubular contact member 30, and the base 21 applied, as indicated in Fig. 1, and welded or otherwise secured to the reflector portion I2 of the bulb, as indicated at 34.

In view of the foregoing description, it will be seen that I have devised a highly efficient lamp for projection purposes, including a reflector as part of its bulb and with a filament centered with respect to said reflector during the course of manufacture. If desired to employ the lamp with a larger or more extensive reflector, such as designated by reference character 35 in Fig. 4, the same may be secured to the edge portion l4 of the lamp Ill by any suitable securing means, as indicated at 35, without disturbing the lens l3 of said lamp. The supplemental reflector 35 may be employed with an outerlens 31, as illustrated.

Referrin now to the embodiment of my invention illustrated in Fig. 5, there is shown a lamp l comprising a bulb I l consisting of a cupshaped reflector portion I2 desirably formed of metal, and a relatively flat transparent window or lens portion I3 desirably formed of glass. In the present embodiment the reflector portion I2 is formed of Kovar, for example, or other metal having a coeflicient of expansion corresponding with that of the glass used, so that its peripheral edge portion may be directly sealed to said glass as illustrated.

The central portion of the reflector [2 is apertured as indicated at 2| a and secured or sealed thereto, as by means of welding, is an annular or circular plate 38 forming an outstanding peripheral flange, as shown. The plate or flange portion 38 need not be of any special metal, such as Kovar as it is not sealed directly to glass, but rather to a special form of base 39, as illustrated.

The base 39 comprises a preferably circular metal plate 40, with an inwardly or upwardly embossed central portion 4|, fitting the aperture 2! and desirably carrying an exhaust tube 26.

The bulb H has sealed thereinto a concentrated filament I6, as in the first embodiment desirably forming part of a mount which is incorporated as a part of the base 39 and includes leads 22 and 23. The lead 22 is desirably welded to the embossed portion 4| of the plate 40, and thereby electrically connected thereto, the lead 23 desirably passing through a glass bead or other insulating portion 24, which may be held in a metal bushing or eyelet 42, if employed, secured to the embossed portion 4t of the plate 40, or held directly in said portion 4 I.

Before finally sealing off the bulb II, the inside of the reflector portion [2 is desirably coated with silver or other metal to form a film or plating providing the desired light reflecting surface, thereby providing an eflicient reflection as part of the bulb. After sealing off the exhaust tube 26 as indicated at 33 the lead 23 may be passed through the metal disc member 43 associated with the cylindrical insulating base element 44 and soldered thereto, as indicated at 45, thereby holding the insulating member 44 in place in the base plate 40, as a housing for the exhaust tube 26 The base plate 40 may, if desired, be provided with the usual form of bayonet slots 46, for holding the completed lamp in place in the usual manner.

The assembly of a lamp, such as shown in Figs. 5 and 6, in a flashlight 41 is illustrated in Fig. '7. The flashlight comprises a casing 48 and a cap 49 threaded to an enlarged portion 50 of said casing, as illustrated and adapted to clamp over the peripheral portion of the lens I? of the lamp l0, after said lamp has been positioned with its slots 46 receiving locking lugs 5| positioned on the end plate portion 52 of the flashlight 41. The lamp Ill is illustrated with its center contact engaging the center contact 53 of the associated dry cell 54, the circuit being completed through the switch 55, when the cell at the other end of the flashlight 41 is grounded to the casing 48 and held therein by the cap 56.

In this embodiment of the invention it will be seen that a flashlight may be produced in which the lens and the reflector are part of the lamp, rather than part of the flashlight casing, as heretofore. In this way duplication of parts is avoided and economy in manufacture obtained.

Referring now to the embodiment of my invention illustrated in Fig. 8, a lamp W is illustrated comprising a bulb ll including a cup-shaped reflector portion l2 sealed to a relatively flat lens portion I3 and provided with an outstanding flange portion 38 all as in accordance with the embodiment of Figs. 5 and 6. However, the exhaust tube 26 is shown coming through the reflector portion of the bulb rather than through the base portion, thereby making it possible to simplify the base portion 39 In the present embodiment, therefore, the base portion consists merely of a circular plate 40 with bayonet slots 46", and a central aperture receiving an insulating member 24, with or without an enclosing metal bushing 42. As in the preceding embodiment a filament I6 of the concentrated variety, is supported by leads 22 and 23 the former being welded to the base plate 40 and the latter insulated therefrom by the means 24 passing through an insulating disc 29 and secured, as by solder 45 to a central contact plate 43 In all forms of my invention the main or primary reflector is permanently sealed from the atmosphere by the lens or glass window l3, and

' means.

thereby protected from dust and oxidation. It will also be noted that a stronger lamp may be provided if the main portion thereof is formed of metal and that such metal parts may be assembled by high speed welding or other desired It will also be understood that the peripheries of the reflector and cover or lens sections are provided with sealing surfaces adapted to abut one another, and that on account of the interfltting relationship shown, comprising an annular ridge or peripheral portion of one and a receiving annular groove or cavity in the other,

means are provided for positioning the said sections in predetermined relationship transversely with respect to one another.

Although preferred embodiments of my invention have been disclosed, it will be understood that modifications may be made within the spirit and scope of the invention as defined by the appended claims.

I claim:

1. An incandescent electric lamp comprising a bulb consisting of a metal reflector portion and a window portion having its edge portion sealed thereto, said reflector portion having a central opening opposite to that covered by the window portion, and a base with associated mount closing said opening and comprising an inner metal plate sealed to said reflector portion, a concentrated filament disposed at the focus of said reflector portion and carried by said plate on a pair of leads, one of said leads being electrically connected to said plate and the other lead passing through and insulated from said plate, and an exhaust tube extending from said plate, an outer casing enclosing said exhaust tube, and a central contact carried by said casing and to which said other lead is connected.

2. A prefocussed incandescent electric lamp comprising a bulb consisting of a reflector portion and a window portion sealed thereto, said reflector portion having a central opening opposite to that covered by the window portion and defined by a generally cylindrical flange, and a base with associated mount closing said opening and comprising an inner metal plate sealed to said reflector portion and having a generally cylindrical flange telescoping with said reflector portion flange, a filament carried by said plate on a pair of leads one of said leads being electrically connected to said plate and the other lead passing through and insulated from said plate, an outer casing for said base having a generally cylindrical flange telescoping over said reflector portion flange, and a central contact carried by said casing and to which said other lead is connected.

3. An incandescent electric lamp comprising a bulb formed of a window portion and a reflector portion, said reflector portion having a central opening opposite to that covered by said window portion, and a flat annular plate directly secured to the edge defining said central opening so that it outstands from said reflector portion as an external flange for supporting the filament mount.

4. An incandescent electric lamp comprising a bulb formed of a window portion and a reflector portion, said reflector portion having a central opening opposite to that covered by said window portion, and a metal mount and base secured to said annular portion and comprising leads carrying a concentrated filament disposed at the focus of said reflector, one of said leads being electrically connected to said base and the other insulated therefrom and passing therethrough, an

exhaust tube portion extending through said base portion, and an insulating cylindrical portion telescoping in said base portion and covering said exhaust tube, said insulated filament lead extending through said cylindrical portion and forming a central contact for said lamp.

5. A flashlight comprising a casing, one end portion of which is enlarged forming a socket for a lamp, an incandescent electric lamp secured in said socket portion and comprising a bulb formed of a cup shaped reflector portion and a relatively flat window portion, and an annular clamp threaded to the socket end of said casing and having an outer rim formed with an inwardly projecting annular flange overlying and directly engaging the edge of said window portion for holding the lamp in place in said socket.

6. A flashlight comprising a generally cylindrical casing, one end portion of which is enlarged forming a socket, a lamp disposed in said socket portion and comprising a bulb formed of a lens and a reflector portion, and a filament centered with respect to said reflector portion and sealed in said bulb, and means for mounting said filament, a portion of which mounting means is formed as a base secured in said socket, and a clamp threaded to the enlarged portion of said casing and provided with a rim overlying the 4 edge portion of said lens for holding the lamp in place in said socket.

7. A prefocussed incandescent electric lamp comprising a bulb formed of a metallic reflector portion and a window portion sealed thereto, said reflector portion having a central opening opposite to that covered by the window portion, and a metal mount carrying leads supporting a concentrated filament, said mount having a peripheral flange telescoped with respect to the central opening of, and directly secured to, said reflector portion.

8. A prefocussed electric lamp comprising a bulb formed of a metallic reflector portion hav ing a central opening for receiving a filament mount and an outer rim, a window portion sealed to said outer rim, a filament mount closing said central opening and so positioned that the filament is central with respect to said reflector portion, and a base telescoping with respect to said reflector and directly secured to said reflector portion, covering said mount, and comprising an outer shell connected to one side of said filament, and a central insulated contact connected to the other side.

9. An incandescent electric lamp comprising a bulb, consisting of a lens, a rim of metal having an appropriate coeflicent of expansion and formed with a cylindrical flange embedded in the inner surface portion of said lens within but near to the edge portion thereof and an outstanding annular flange underlying and extending beyond said edge portion, and a reflector portion welded to said annular flange, and a concentrated filament centered with respect to said reflector portion.

10. An incandescent electric lamp comprising a bulb formed of a metallic reflector portion and a window portion sealed thereto, said reflector portion having a central opening opposite to that coveredby said window portion, and a metal mount carrying leads supporting a concentrated filament, said mount having a peripheral flange telescoped with respect to the central opening of said reflector and secured in such position that the center of the filament corresponds with the focus of the reflector, and a base telescoping with respect to said reflector, covering said mount, and comprising an outer 'shell connected to one side of said filament and a central insulated contact connected to the other side.

11. An incandescent electric lamp comprising a bulb formed of a window and a reflector portion, said reflector portion consisting of metal having a coefiicient of expansion corresponding with that of the window and having an outer edge, said window receiving said edge of the reflector portion embedded in its inner surface adjacent its periphery, and a filament centered with respect to said reflector portion and sealed in said bulb.

12. An incandescent electric lamp comprising a bulb formed of a window portion and a reflector portion, said reflector portion being formed of metal having a coefficient of expansion corresponding with that of the window portion, said window portion having its edge portion secured to said reflector portion, said reflector portion having a central opening opposite to that covered by said window portion, and an annular plate secured to the edge defining said central opening,

so that it outstands from said reflector portion as a flange.

13. An incandescent electric lamp comprising a bulb formed of a window portion and a reflector portion, said reflector portion being formed of metal having a coefficient of expansion corresponding with that of the window portion, said window portion having its edge portion secured to said reflector portion, said-reflector portion having a central opening opposite to that covered by said window portion, an annular plate secured to the edge defining said central opening, so that it outstands from said reflector portion as a flange, and a metal mount and base secured to said annular portion and comprising leads carrying a concentrated filament disposed at the focus of said reflector, one of said leads being electrically connected to said base and the other insulated therefrom and passing therethrough, an exhaust tube portion extending through said base portion, and an insulating cylindrical portion telescoping in said base portion and covering said exhaust tube, said insulated filament lead extending through said cylindrical portion and forming a central contact for said lamp.

14. A flashlight comprising a casing one end portion of which is enlarged forming a socket for a lamp, an incandescent electric lamp secured in said socket portion and comprising a bulb formed of a cup shaped reflector portion and a relatively flat Window portion, said reflector portion having a metal light-reflecting surface and sealed to said window portion, and an annular clamp threaded to the socket end ofsaid casing and having an outer rim formed. with an inwardly projecting annular flange overlying and directly engaging the edge of said window portion for holding the lamp in place in said socket.

15. A flashlight comprising a generally cylindrical casing one end portion which is enlarged forming a socket, a lamp disposed in said socket portion and comprising a bulb formed of a lens and a reflector portion, said reflector portion being of metal having a coeflicient of expansion corresponding with that of the lens, said lens having its edge portion fused to said reflector portion, and a filament centered with respect to said reflector portion and sealed in said bulb, a mount for said filament, a portion of which is formed as a base secured in said socket, and a clamp threaded to the enlarged portion of said casing and provided with a rim overlying the edge portion of said lens for holding the lamp in place in said socket.

16. An incandescent electric lamp comprising a bulb formed of a metallic reflector portion and a window portion sealed thereto, said reflector portion having an inner metallic surface and a central opening opposite to that covered by said window portion, and a metal mount carrying leads supporting a concentrated filament, said mount having a flange portion telescoping in said central opening and directly secured to the reflector in such position that the center of the filament corresponds with the focus of said reflector, and a base portion secured to said reflector, closing said opening, covering the outer portion of said mount, and comprising a shell formed with a central insulated contact connected to one side of said filament and with its edge portion secured to the peripheral edge defining said opening.

GILBERT C. HOLLOWAY.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2508063 *Dec 28, 1949May 16, 1950Gross Henry RFarm light
US2917869 *Apr 29, 1957Dec 22, 1959Gen ElectricElectric lamp making apparatus
US3917939 *Jul 5, 1973Nov 4, 1975Bosch Gmbh RobertSealed-beam headlight employing a halogen lamp
DE1589365B *Feb 27, 1967Nov 11, 1971Tokyo Shibaura Electric CoGluehlampe
Classifications
U.S. Classification362/202, 313/318.11, 313/315, 313/111, 174/50.56, D26/49, 174/50.53, 174/17.8, 313/318.3, 174/50.6, 313/269
International ClassificationH01K1/32, H01K1/28
Cooperative ClassificationH01K1/325
European ClassificationH01K1/32B