US2145157A - Incandescent electric lamp - Google Patents

Incandescent electric lamp Download PDF

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Publication number
US2145157A
US2145157A US214824A US21482438A US2145157A US 2145157 A US2145157 A US 2145157A US 214824 A US214824 A US 214824A US 21482438 A US21482438 A US 21482438A US 2145157 A US2145157 A US 2145157A
Authority
US
United States
Prior art keywords
envelope
filament
lamp
leading
wires
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
US214824A
Other languages
English (en)
Inventor
William T Cowhig
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
Application granted granted Critical
Publication of US2145157A publication Critical patent/US2145157A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01KELECTRIC INCANDESCENT LAMPS
    • H01K3/00Apparatus or processes adapted to the manufacture, installing, removal, or maintenance of incandescent lamps or parts thereof

Definitions

  • the present invention relates to incandescent electric lamps and more particularly to such 'lamps in which a relatively short coiled filament of a refractory metal such as tungsten is mounted within and sealed into an envelope consisting of a tube of quartz or other like strong, heat resisting transparent or translucent vitreous material so as to lie axially within the tube.
  • a relatively short coiled filament of a refractory metal such as tungsten
  • One object of my invention is to provide a method of mounting the filament of an electric incandescent lamp so that it may be easily drawn taut without weakening the lamp envelope.
  • the sealing of the leading-in wiresinto the drawn-down ends or neck portions of the tubular envelope is eflected at points somewhat spaced from the body of the envelope, and after the envelope has been sealedoil the portion of one or both of the drawn-down ends of the envelope, adjacent the body thereof,
  • a typical double-ended lamp comprising a filament I mounted within a small tubular envelope 2 preferably of quartz or other high heat-resistant glass.
  • the filament I is disposed substantially axially of the tubular envelope 2 which is of relatively small internal diameter.
  • Opposite ends of the filament are connected to current supply or leading-in wires sealed into reduced end or neck portions 2' of the lamp envelope 2, each of said wires comprising a length of molybdenum wire 3 secured to the filament l, a strip of molybdenum foil attached to the wire 3, and a section of molybdenum strip 5 secured to the foil 4.
  • the filament assembly is sealed into the quartz or glass envelope 2 in the usual way, using the above-described molybdenum strip seal.
  • the seals are at a relatively short distance, such as 1 or 2 mm.', from the body of the lamp envelope 2. According to my invention, however, the seal is made at a considerably greater distance from 10 the body of the lamp envelope, preferably at a distance of about to 1 cm. therefrom, as shown in the drawing.
  • the lamp envelope is then exhausted through the exhaust tube Ii after which the filament is then burned or flash aged in the .customary manner until recrystallization processes, etc., are complete.
  • the envelope neck portion A immediately adjacent the body of the envelope 2 is then softened and the filament I drawn taut by a pulling-out or stretching operation.
  • One or both of the envelope neck portions A between the body of the envelope and the current supply wire seal may be softened to permit this drawing-out Q or stretching of the filament.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Resistance Heating (AREA)
  • Threshing Machine Elements (AREA)
US214824A 1937-07-13 1938-06-20 Incandescent electric lamp Expired - Lifetime US2145157A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB19403/37A GB498827A (en) 1937-07-13 1937-07-13 Improvements relating to electric incandescent lamps

Publications (1)

Publication Number Publication Date
US2145157A true US2145157A (en) 1939-01-24

Family

ID=10128767

Family Applications (1)

Application Number Title Priority Date Filing Date
US214824A Expired - Lifetime US2145157A (en) 1937-07-13 1938-06-20 Incandescent electric lamp

Country Status (4)

Country Link
US (1) US2145157A (fr)
BE (1) BE429127A (fr)
DE (1) DE681139C (fr)
GB (1) GB498827A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3408719A (en) * 1965-11-08 1968-11-05 Gen Electric Method of assembling lamp filament and support structure
US3685880A (en) * 1970-07-06 1972-08-22 Gen Electric Manufacture of lamps of the compact arc discharge type
US3900237A (en) * 1973-08-09 1975-08-19 Gte Sylvania Inc Method of making arch shaped arc tube

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3408719A (en) * 1965-11-08 1968-11-05 Gen Electric Method of assembling lamp filament and support structure
US3685880A (en) * 1970-07-06 1972-08-22 Gen Electric Manufacture of lamps of the compact arc discharge type
US3900237A (en) * 1973-08-09 1975-08-19 Gte Sylvania Inc Method of making arch shaped arc tube

Also Published As

Publication number Publication date
GB498827A (en) 1939-01-13
BE429127A (fr)
DE681139C (de) 1939-09-15

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