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Publication numberUS3480816 A
Publication typeGrant
Publication dateNov 25, 1969
Filing dateApr 25, 1967
Priority dateApr 25, 1967
Publication numberUS 3480816 A, US 3480816A, US-A-3480816, US3480816 A, US3480816A
InventorsFallon Bernard R
Original AssigneeWestinghouse Electric Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Quartz lamp base and socket
US 3480816 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

NOV. 25, 1969 B, R, FALLON QUARTZ LAMP BASE AND SOCKET Filed April 25, 1967 mami INVENTOR Bernard R. Folon WITNESSES M JW ATTORN EY United States Patent O 3,480,816 QUARTZ LAMP BASE AND SOCKET Bernard R. Fallon, Clark, NJ., assignor to Westinghouse Electric Corporation, Pittsburgh, Pa., a corporation of Pennsylvania Filed Apr. 25, 1967, Ser. No. 633,531 Int. Cl. H013 /48, 5/50 U.S. Cl. 313-51 3 Claims ABSTRACT OF THE DISCLOSURE A novel lamp base and socket is particularly adaptable to projection lamps because accurate orientation of the lamp filament is effected. A large, positive area for electrical contact is provided by flat recessed base conductors. Socket spring conductors effect electrical contact and also act in conjunction with recessed base surfaces to retain the base in position.

Background of the invention This invention relates to an electric lamp base and socket combination particularly adaptable to projection lamps.

The projection lamp art exacts critical demands for orientation of the lamp filament to insure proper focusing and display. The lamp base and socket combinations presently used for such lamps include simple threaded base and socket assemblies which present serious orientation problems. Also used are assemblies utilizing pin type contact elements which are clumsy to insert and are easily bent and damaged when used with these relatively small lamps. These lamps have a relatively high power input and means for providing sufficient electrical contact area from the base to the socket conductors is very important. The bases presently used also restrict natural ventilation of the press portion of the lamp envelope, which can result in overheating and shortened operational lifetime of the lamp.

Summary It is an object of this invention to provide a novel lamp base and socket which in combination positively orient the lamp filament of a projection lamp and retain the lamp in a fixed predetermined position.

It is another object to provide such a lamp base and socket with flat conductive contact members for ease of lamp mounting and which contacts provide a larger and more positive area of contact.

It is still another object to provide a simplified base and socket design thereby simplifying the lamp manufacturing process by minimizing tolerance problems yet retaining positive filament orientation.

It is a further object to provide a lamp base and socket allowing natural ventilation of the press area of the lamp.

These objects and other that will become apparent as the description proceeds are accomplished by providing a novel base and socket. The base is an insulating hightemperature-stable member provided with a centrally disposed slot in which the press portion of the lamp is affixed. Electrically conductive base elements that are connected to the lamp lead wires are disposed as exterior recessed surfaces. The socket is an insulating high-temperature-stable member substantially conforming in shape and diversion to the base to accept the base. Also, electrically conductive socket spring contact means are provided to contact the flat recessed base contacts and thereby mechanically retain the base in a stable, predetermined, oriented position.

Brief description of the drawings For a better understanding of the invention and its capabilities, reference is made to the following drawings, wherein:

icel

FIGURE 1 is an elevation in cross-section of the base and a fragmentary portion of the lamp;

FIG. 2 is an elevation in cross-section of the socket; and

FIG. 3 is a plan View of the socket before the socket contact members have been affixed.

Description of the preferred embodiments With specific reference to the drawings the lamp 10 comprises a sealed vitreous light-transmitting envelope 12 having a flattened press portion 14. An incandescible filament 16 is provided within the envelope 12 and is supported in a predetermined oriented position with respect to the press 14 by support means 17 which here consists of the internal conductors but can be an independent support means within the lamp. The envelope 12 encloses a predetermined pressure of preselected fill gas, such as argon and a predetermined amount of additive material such as iodine. Lead-in conductors 18 are sealed through the press and electrically connect to the lamp filament 16.

The lamp base 20 comprises an electrically insulating high-temperature-stable member 22 having a generally rectangular cross-section. The insulating member 22 is provided with a deep, centrally disposed slot 24 having opposite elongated sides generally paralleling opposite external sides of the insulating member 22.. The slot 24 is so disposed as to open into at least one predetermined surface 26 which faces the lamp filament 1-6. This insulating member 22 is formed of a thermosetting resin such as phenolic epoxy, or is formed of ceramic or similar insulating material. The lamp press portion 14 is positioned within the slot 24 with the flattened sides of the press 14 generally paralleling the elongated sides of the centrally disposed slot 24. A high-temperature-stable electrically insulating cement 28 substantially fills the portion of the centrally disposed slot 24 which is not occupied by the press 14 and the cement 28 afixes the press 14 to the insulating member 22. This cement 2S is a high temperature resistant material, for example a material with a sodium silico fluoride setting agent and Zircon filler, or other ceramic type cements as are known in the art. Two of the opposite exterior surfaces 30 of the insulating member 22 which generally parallel the elongated sides of the slot 24 are provided with a recessed surface portion 32 contiguous to the predetermined surface 26 which faces the lamp filament 16. The recessed surface portion 32 generally parallels the elongated sides of the centrally disposed slot 24. The recessed surface portions 32 extends away from the insulating member surface that faces the filament and may terminate at a ledge 33 provided between the recessed surface portion 32 and the exterior surface 30 of the insulating member 22. This ledge 33 acts in conjunction with the socket spring contact means 54 after insertion to mechanically retain the base 20 in the predetermined position.

The base 20 is provided with two flattened U-shaped electrically conductive base contact members 34. One leg 36 of the base contact 34 projects away from the lamp filament 16 and is fitted into the recessed surface portion 32. The other leg 38 of the base Contact 34 projects away from the lamp filament 16 and is affixed between the press 14 'and the sides of said slot 24 and is retained in position by the cement 28. The base contacts 34 are electrically connected to the lamp lead-in conductors 18. The base contacts are made of a material such as brass.

At least one of the electrical connections between the base contacts 34 and the lamp lead-ins 18 may include a fuse 19 which may be fuse-wire disposed within the slot and retained in position by the cement 28.

The improved socket 40 comprises an electrically insulating high-temperature-stable socket member 42 which is provided with a generally rectangular centrally disposed cavity 44. The cavity 44 opens into one predetermined socket surface 46 and substantially conforms in shape and dimensions to the base member 22 allowing insertion of the base into the socket cavity 44. The insulating socket member 42 is made of a thermosetting resin such as phenolic epoxy, or is formed of ceramic or similar material.

The socket 40 has two electrically conductive socket contact members 48 which are mechanically attached to and extend through the elongated opposite sides of said socket member 50-52. A portion of each of the socket contacts 48 extends a predetermined distance into the cavity 44 as an inwardly disposed spring contact means 54. The spring contact 54 is compressed outwardly by the base member 22 upon initial insertion of the base member 22 into the socket cavity 44. The spring contacts 54 electrically contact the base contacts 34 upon further insertion of the base 20 into the socket cavity 44. The spring action of the spring contact means 54 exerts a positive holding action against the base contacts 34 both to insure electrical contact and to mechanically retain the base 20, when the recessed surface portion 32 of the exterior surface of the base member 22 is encountered upon further insertion of the base member 22 into the cavity 44. The socket contact members 48 are adapted to be connected to a source of electrical energy for powering the lamp 10. The socket member 42 is adapted to be mechanically mounted in a predetermined position.

The socket has Ventilating slots 56 provided in opposite sides of the socket member 42 and opening into the centrally disposed cavity 44. The Ventilating slots 56 allow for natural ventilation of the press portion 14 of the lamp 10.

It will be recognized that a novel lamp base and socket combination has been provided that positively orients the lamp lament. The base has flat recessed electrical contact members to provide a large positive area of electrical contact in conjunction with socket spring contacts. The spring contacts act to mechanically retain the base securely in position, and the recessed contact position insures retention of the base in position.

It is to be understood that while a specific detailed description of the invention has been given, the invention is not to be limited thereto or thereby.

I claim as my invention:

1. In combination with an incandescent lamp comprising a sealed vitreous light-transmitting envelope having a attened press portion, an incandescible lament within said envelope, said filament supported in a predetermined oriented position with respect to said press, said envelope enclosing a predetermined pressure of preselected ll gas, and lead-in conductors sealed through said press and electrically connected to the said lamp filament, the improved lamp base comprising:

(a) an electrically insulating high-temperature-stable member having a generally rectangular cross-section and provided with a deep centrally disposed slot having opposite elongated sides generally paralleling opposite sides of said insulating member, said slot opening into at least one predetermined surface of said insulating member, and one of said predetermined surfaces of said insulating member facing said lamp filament, said envelope press portion positioned within said slot with the attened sides of said press portion generally paralleling said elongated sides of said centrally disposed slot;

(b) a high-temperature-stable electrically insulating cement substantially lling the portion of said centrally disposed slot which is not occupied by said press portion and afiixing said press portion to said insulating members;

(c) the two opposite exterior surfaces of said insulating member which generally parallel said elongated sides of said slot each being provided with a recessed surface portion contiguous to and extending away from said predetermined surface which faces said filament, and each said recessed surface portion generally paralleling said elongated sides of said centrally disposed slot, said recessed surface portion terminates at a ledge provided between said opposite exterior surfaces and said recessed surface portion; and

(d) two flattening U-shaped electrically conductive base contact members each having one leg thereof projecting away from said filament and tted into said recessed surface portion and said ledge, the other leg of said base contact members projecting away from said filament and affixed between said press and the sides of said slot and retained in position by said cement, and said base contacts being electrically connected to each of said lamp lead-ins.

2. The base as specified in claim 1, wherein at least one of the electrical connections between said base contacts and said lamp lead-ins includes a fuse.

3. ln combination with an incandescent lamp comprising a sealed vitreous light-transmitting envelope having a flattened press portion, an incandescible filament within said envelope, said filament supported in a predetermined orientated position with respect to said press, said envelope enclosing a predetermined pressure of preselected ll gas, and lead-in conductors sealed through said press and electrically connected to the said lamp lament, the improved lamp base and socket combination which comprises:

(a) said improved base comprising:

(1) an electrically insulating high-temperaturestable member having a generally rectangular cross-section and provided with a deep centrally disposed slot having opposite elongated sides generally paralleling opposite sides of said insulating member, said slot opening into at least one predetermined surface of said insulating member, and one of said predetermined surfaces of said insulating member facing said lamp filament, said envelope press portion positioned within Said slot with the flattened sides of said press portion generally paralleling said elongated sides of said centrally disposed slot,

(2) a high-temperature-stable electrically insulating cement substantially filling the portion of said centrally disposed slot which is not occupied by said press portion and afxing said press portion to said insulating member,

(3) the two opposite exterior surfaces of said insulating member which generally parallel said elongated sides of said slot each being provided with a recessed surface portion contiguous to and extending away from said predetermined surface which faces said filament, and each said recessed surface portion generally paralleling said elongated sides of said centrally disposed slot, said recessed surface portion terminates at a ledge provided between said opposite exterior Surfaces and said recessed surface portion; and

(4) two flattened U-shaped electrically conductive base contact members each having one leg thereof projecting away from said filament and tted into said recessed surface portion and said ledge, the other leg of said base contact members projecting away from said filament and affixed between said press and the sides of said slot and retained in position by said cement, and said =base contacts being electrically connected to each of said lamp lead-ins;

(b) said improved socket comprising:

(l) an electrically insulating high-temperaturestable socket member provided with a generally rectangular centrally disposed cavity opening into one predetermined surface thereof and substantially conforming in shape and dimension to said base to allow insertion of said base into said cavity,

(2) two electrically conductive socket contract members mechanically attached to and extending through the elongated opposite sides of said socket member, a portion of each said contact extending a predetermined distance into said cavity as an inwardly disposed spring contact tain said base in predetermined position, and said socket contact members adapted to be connected to a source of electrical energy for powering the lamp; and

(3) said socket member adapted to be mechanically mounted in a predetermined position.

means, said spring contact means being compressed outwardly by said base upon initial insertion of said base into said socket cavity, upon further insertion of said base into said socket 10 References Cited UNITED STATES PATENTS cavity, said spring contact means electrically Sroveniller contacting said base contacts, and the spring 3274426 9/1966 soelscd 13T' 8 action of said spring contact means as well as co e ge 3 51 X the contact of said spring Contact means with the portion of said base contact member which JAMES W' LAWRENCE Pnmary Examiner its said ledge portion of said base member E. R. LAROCHE, Assistant Examiner exerting a positive holding action against said base contacts both to insure a broad surface U-S- Cl- X-R area of electrical Contact and to mechanically re- 339-145, 25 6

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2892992 *Feb 4, 1957Jun 30, 1959Gen ElectricPrinted circuit lamp base
US3017599 *Jan 5, 1960Jan 16, 1962Gen Motors CorpLamp socket
US3274426 *May 7, 1962Sep 20, 1966Sylvania Electric ProdElectric lamp with fuse
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3892463 *Sep 13, 1971Jul 1, 1975Horan John JSnap-latching, snap-lighting electric lamps and methods for making same
US4837479 *Feb 16, 1984Jun 6, 1989GTE Products CompanyElectric lamp with insulating base
US5261837 *Oct 23, 1991Nov 16, 1993Mcdonnell Douglas CorporationHigh density bi-pin receptacle
US6075318 *Mar 10, 1998Jun 13, 2000Patent-Treuhand-Gesellschaft Fuer Elektrische Gluelampen MbhHalogen incandescent lamp having a socket
DE19709928A1 *Mar 11, 1997Sep 17, 1998Patra Patent TreuhandHalogenglühlampe und Fassung
Classifications
U.S. Classification313/51, 439/834, 439/619, 439/676
International ClassificationH01R33/09, H01K1/42, H01K1/46, H01R33/05
Cooperative ClassificationH01R33/09, H01K1/46
European ClassificationH01K1/46, H01R33/09
Legal Events
DateCodeEventDescription
Mar 30, 1983ASAssignment
Owner name: NORTH AMERICAN PHILIPS ELECTRIC CORP.
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WESTINGHOUSE ELECTRIC CORPORATION;REEL/FRAME:004113/0393
Effective date: 19830316