US3270237A - Electric lamp with single ended pinch seal - Google Patents

Electric lamp with single ended pinch seal Download PDF

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Publication number
US3270237A
US3270237A US290755A US29075563A US3270237A US 3270237 A US3270237 A US 3270237A US 290755 A US290755 A US 290755A US 29075563 A US29075563 A US 29075563A US 3270237 A US3270237 A US 3270237A
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US
United States
Prior art keywords
pinch seal
envelope
seal
lamp
passage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US290755A
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English (en)
Inventor
George K Danko
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Priority to US290755A priority Critical patent/US3270237A/en
Priority to NL6407007A priority patent/NL6407007A/xx
Priority to ES301399A priority patent/ES301399A1/es
Priority to DEG40940A priority patent/DE1279180B/de
Priority to SE7849/64A priority patent/SE311042B/xx
Application granted granted Critical
Publication of US3270237A publication Critical patent/US3270237A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K3/00—Apparatus or processes adapted to the manufacture, installing, removal, or maintenance of incandescent lamps or parts thereof
    • H01K3/22—Exhausting, degassing, filling, or cleaning vessels
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/38—Seals for leading-in conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K3/00—Apparatus or processes adapted to the manufacture, installing, removal, or maintenance of incandescent lamps or parts thereof

Definitions

  • This invention relates generally to electric lamp structures and methods of manufacture, and more particularly to lamps embodying a single ended pinch seal construction wherein an end of the lamp envelope is closed by a compressed pinch seal through which extend the lead-in conductors.
  • FIG. 1 is an elevation of a lamp tion
  • FIGS. 2 to 9 illustrate various steps in the assembly of the lamp.
  • the lamp illustrated herein is of the high intensity compact iodine-cycle type comprising a tubular bulb or envelope 1 containing a longitudinally extending filament 2 of coiled tungsten wire, here shown as a coiled coil, and a gas filling including a small quantity of iodine vapor and an inert gas such as nitrogen, argon, krypton or xenon or mixtures thereof at a pressure of preferably at least several hundred millimeters of mercury, and even substantially exceeding atmospheric.
  • a gas filling including a small quantity of iodine vapor and an inert gas such as nitrogen, argon, krypton or xenon or mixtures thereof at a pressure of preferably at least several hundred millimeters of mercury, and even substantially exceeding atmospheric.
  • the iodine serves as a regenerative getter to maintain the walls of the bulb 1 free from deposits of tungsten vaporized from the filament.
  • the bulb 1 is made of glass having a relatively high softening point, such as one of the well known so-called hard glasses like borosilicate or aluminosilicate glasses, or quartz glass.
  • the filament 2 is of any desired capacity sufficient to maintain the required bulb wall temperature, for example about 150 watts or more for operation from conventional power supp-1y sources of about 110 or 220 volt-s.
  • the filament 2 is supported by long and short inner lead wires 3 and 4 respectively, which may be of tungsten wire and which extend into and are heremetically sealed in a compressed pinch seal portion 5 at the end of the hard glass bulb 1.
  • the inner lead Wires 3 and 4 are connected to respective outer lead Wires 6 and 7 which have their upper ends embedded in the pinch seal 5 and which may be sufliciently rigid to support the lamp.
  • the filament 3 may be additionally supported by a tungsten support wire 8 (see FIG. 7) having one end embedded in the upper end of an exhaust tube 9 and its other end formed into a loop encircling the filament 2 at a point intermediate its ends.
  • the composite lead wires 3, 6 and 4, 7 may be made of a single continuous length of wire such as tungsten, as here illustrated the outer leads 6 and 7 are composed of heavier embodying the invenwires of different composition such .as a nickel-iron alloy known as 52 Alloy (52% nickel and the remainder substantially iron) or piano wire, for example.
  • the glass exhaust tube 9 extends through the interior of the pinch seal 5 forming a passage or cavity 10 therethrough and in communication with the interior of the bulb 1 during manufacture of the lamp.
  • the passage 10' is sealed off by heating and collapsing and sealing the walls of said passage at a localized area 11 in the pinch seal 5 remote from the outer end of said pinch seal and closely contiguous to the interior of the bulb 1.
  • the upper end of the exhaust tube 9 is preferably heated and upset to form a button 12, and one end of a straight length of the support wire 8 is inserted into the softened button 12.
  • the exhaust tube 9 may be supported in a support member or spindle 13 as shown somewhat diagrammatically in FIG. 3, the said holder :13 being one of a number of such holders carried at the periphery of the indexing turret of a mount-making machine similar to those well known in the art.
  • the exhaust tube is loaded into an axial passage 14 in the holder 13 with its bottom engaging a shoulder 15, the pas-sage being sealed off by an O-ring seal 16.
  • the support wire 8 is bent to the shape shown in FIG. 5 with a loop in its free end encircling the filament 2 at its midpoint.
  • the glass envelope 1 is dropped over the assembly of filament 2 and lead wires 3, 6 and 4, 7 with its open lower end resting on a shoulder 21 (FIG. 3) on the support member 13.
  • a flow of inert or reducing gas for example nitrogen, is started into the lower end of the exhaust tube 9 by way of a passage .22 (FIG. 3) in the support member 13, in order to protect the filament and other wires inside envelope 1 from oxidation, after which a zone of the envelope 1 adjacent the upper end of the exhaust tube 9 is heated by flames from burners indicated at 23.
  • the burners 23 are actually directed at the envelope 1 in directions at right angles to those shown in FIG.
  • the said zone is heated to its softening point and the walls of the envelope 1 are collapsed and then compressed by a pair of pinch jaws, not shown, to form the seal area 5 (FIGS. 7 and 8) in which are hermetically sealed and embedded portions of the lead wires 3 and 4.
  • the said pinch jaws are relieved or notched at the center in known manner so that the inner walls of envelope 1 in area 5 are fused and hermetically sealed to the outer walls of the exhaust tube 9 without closing the passage through the interior of the exhaust tube.
  • the portions of lead wires 3 and 4 which are embedded in the seal 5 may be precoated or beaded with glass in known manner.
  • the assembly thus formed and shown in FIG. 7, is then removed from the holder 13 (FIG. 3) and transferred to exhaust and gas filling equipment in which it is preferably supported in an inverted position as shown in FIG. 9.
  • the envelope 1 is then exhausted and filled with the desired gas filling, such as argon and a small quantity of iodine.
  • the lower end of the envelope 1 is preferably cooled with liquid nitrogen to condense the iodine vapor and to lower the pressure of the gas filling below atmospheric.
  • the envelope 1 is sealed off as shown at 11 in FIG. 9, preferably by locally heating the walls of the seal area 5 with burners indicated at 24 and either permitting the glass to collapse or compressing with pinch jaws to form the seal 11.
  • exhaust tube 9 extending beyond the pinch seal 5 may then be removed in any convenient manner, for example by simply snapping or cracking it 0E to complete the lamp structure shown in FIG. 1.
  • the lamp may be mounted in a socket by using outer lead wires -6 and 7 of sufficient size to serve as termnial pins or prongs for insertion into the contacts of a socket.
  • the lamp may also be mounted in an outer bulb and base assembly for use in conventional sockets as shown, for example, in application Serial No. 274,461, filed April 22, 19*63'by F. A. Mosby and assigned to the same assignee as the. present invention.
  • An electric lamp comprising a glass envelope containing a light source and having its end closed by a flattened pinch seal, a pair of lead-in conductors extending longitudinally through said seal from said light source, and a residue of glass exhaust tubing sealed in and extending longitudinally through .said pinch seal and defining a passage to the interior of said envelope, the walls of said passage being collapsed and sealed at a localized area remote from the outer end of said pinch seal and closely contiguous to the interior of said envelope.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Resistance Heating (AREA)
  • Glass Compositions (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US290755A 1963-06-26 1963-06-26 Electric lamp with single ended pinch seal Expired - Lifetime US3270237A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US290755A US3270237A (en) 1963-06-26 1963-06-26 Electric lamp with single ended pinch seal
NL6407007A NL6407007A (xx) 1963-06-26 1964-06-19
ES301399A ES301399A1 (es) 1963-06-26 1964-06-25 Mejoras introducidas en la fabricación de lámparas eléctricas
DEG40940A DE1279180B (de) 1963-06-26 1964-06-26 Verfahren zur Herstellung elektrischer Gluehlampen
SE7849/64A SE311042B (xx) 1963-06-26 1964-06-26

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US290755A US3270237A (en) 1963-06-26 1963-06-26 Electric lamp with single ended pinch seal

Publications (1)

Publication Number Publication Date
US3270237A true US3270237A (en) 1966-08-30

Family

ID=23117417

Family Applications (1)

Application Number Title Priority Date Filing Date
US290755A Expired - Lifetime US3270237A (en) 1963-06-26 1963-06-26 Electric lamp with single ended pinch seal

Country Status (5)

Country Link
US (1) US3270237A (xx)
DE (1) DE1279180B (xx)
ES (1) ES301399A1 (xx)
NL (1) NL6407007A (xx)
SE (1) SE311042B (xx)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3395007A (en) * 1965-08-02 1968-07-30 Signalite Inc Method for forming electric lamps and similar devices
US3817591A (en) * 1968-04-11 1974-06-18 Lampes Elect Fab Reunies Method of manufacturing a lamp
US3891885A (en) * 1973-02-07 1975-06-24 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Halogen incandescent lamp
US4065694A (en) * 1975-02-25 1977-12-27 Westinghouse Electric Corporation Regenerative-cycle incandescent lamp containing SnI4 additive
US4139794A (en) * 1976-11-26 1979-02-13 General Electric Company Wedge-pin glass halogen lamp with transverse reference feature
US4163171A (en) * 1976-11-02 1979-07-31 Patent-Treuhand Gesellschaft fur Electrische Glumlampen mbH Halogen cycle incandescent lamp
US4178050A (en) * 1976-01-16 1979-12-11 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh Manufacture of halogen cycle incandescent lamps
EP0019850A1 (en) * 1979-05-24 1980-12-10 Kabushiki Kaisha Toshiba Halogen incandescent lamp
US5174802A (en) * 1991-09-16 1992-12-29 Hsu Ming Hsun Process for manufacturing various series of plug-in light bulbs

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3798491A (en) * 1972-12-18 1974-03-19 Gen Electric Rounded end halogen lamp with spiral exhaust tube and method of manufacutre

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2159794A (en) * 1937-04-29 1939-05-23 Gen Electric Electric lamp and similar devices
US2664517A (en) * 1952-02-27 1953-12-29 Westinghouse Electric Corp Tipless quartz lamp
US2749203A (en) * 1951-06-30 1956-06-05 Gen Electric Manufacture of decorative lamps
US2883571A (en) * 1958-03-03 1959-04-21 Gen Electric Electric incandescent lamp
US2914371A (en) * 1955-06-16 1959-11-24 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Method of making miniature lamps
US2999180A (en) * 1955-09-07 1961-09-05 British Thomson Houston Co Ltd Electric lamps
US3091718A (en) * 1960-07-08 1963-05-28 Duro Test Corp Constant lumen maintenance lamp

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1028230B (de) * 1955-11-28 1958-04-17 Gen Electric Verfahren zur Herstellung von Gluehlampen und aehnlichen Glasgefaessen

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2159794A (en) * 1937-04-29 1939-05-23 Gen Electric Electric lamp and similar devices
US2749203A (en) * 1951-06-30 1956-06-05 Gen Electric Manufacture of decorative lamps
US2664517A (en) * 1952-02-27 1953-12-29 Westinghouse Electric Corp Tipless quartz lamp
US2914371A (en) * 1955-06-16 1959-11-24 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Method of making miniature lamps
US2999180A (en) * 1955-09-07 1961-09-05 British Thomson Houston Co Ltd Electric lamps
US2883571A (en) * 1958-03-03 1959-04-21 Gen Electric Electric incandescent lamp
US3091718A (en) * 1960-07-08 1963-05-28 Duro Test Corp Constant lumen maintenance lamp

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3395007A (en) * 1965-08-02 1968-07-30 Signalite Inc Method for forming electric lamps and similar devices
US3817591A (en) * 1968-04-11 1974-06-18 Lampes Elect Fab Reunies Method of manufacturing a lamp
US3891885A (en) * 1973-02-07 1975-06-24 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Halogen incandescent lamp
US4065694A (en) * 1975-02-25 1977-12-27 Westinghouse Electric Corporation Regenerative-cycle incandescent lamp containing SnI4 additive
US4178050A (en) * 1976-01-16 1979-12-11 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh Manufacture of halogen cycle incandescent lamps
US4163171A (en) * 1976-11-02 1979-07-31 Patent-Treuhand Gesellschaft fur Electrische Glumlampen mbH Halogen cycle incandescent lamp
US4139794A (en) * 1976-11-26 1979-02-13 General Electric Company Wedge-pin glass halogen lamp with transverse reference feature
EP0019850A1 (en) * 1979-05-24 1980-12-10 Kabushiki Kaisha Toshiba Halogen incandescent lamp
US5174802A (en) * 1991-09-16 1992-12-29 Hsu Ming Hsun Process for manufacturing various series of plug-in light bulbs

Also Published As

Publication number Publication date
ES301399A1 (es) 1964-11-16
SE311042B (xx) 1969-05-27
NL6407007A (xx) 1964-12-28
DE1279180B (de) 1968-10-03

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