US1809661A - Electric lamp - Google Patents

Electric lamp Download PDF

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Publication number
US1809661A
US1809661A US341004A US34100429A US1809661A US 1809661 A US1809661 A US 1809661A US 341004 A US341004 A US 341004A US 34100429 A US34100429 A US 34100429A US 1809661 A US1809661 A US 1809661A
Authority
US
United States
Prior art keywords
lamp
deposit
tungsten
filament
bulb
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
US341004A
Other languages
English (en)
Inventor
Daniel K Wright
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
Priority to NL50283D priority Critical patent/NL50283B/xx
Priority to NL28546D priority patent/NL28546C/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US341004A priority patent/US1809661A/en
Priority to GB20547/29A priority patent/GB337782A/en
Priority to FR702878D priority patent/FR702878A/fr
Application granted granted Critical
Publication of US1809661A publication Critical patent/US1809661A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

  • My invention relates to electric lamps and similar electrical devices which comprise electric energy translation elements such as filaments and electrodes which are enclosed in a hermetically sealed glass or other transparent bulb or container.
  • My invention consists of means for removing deposits which are formed on the inner surface of the bulb or other transparent container during the operation of the-device.
  • My invention finds particular application to electric incandescent lamps in which a filament is heated to incandescence although it is obvious that it is also applicable to certain types of arc lamps-and to other electrical devices comprising elements which are heated to high temperatures and for this reason give rise to vapors which are condensed on the inner surface of the transparent container.
  • a quantity of loose granular material is included in the bulb or other container, and this material is of such a nature that it will not injuriously affect the filament or electrodes which, in
  • The, object of my invention is to provide means that if any of such materials become deposited, for instance, on the filament of an incandescent lamp which is ordinarily of refractory metal such as tungsten, they will fuse and are also vaporized to a certain extent causing short circuiting, arcing and corrosion of the filament.
  • a heavy metal, such astungsten as the scouring act-ion is more effective and rapid.
  • the high melting point is, also highly desirable, not. only because there will'be no melting of material which has lodged on the filament, but because a preliminary firing of the material may be made at temperatures comparable with the highest reached in the lamp and moisture may be thus efi'ectively removed.
  • Fig. 1 is an elevation of an electric incandescent lamp comprising my invention
  • Fig. 2 is an elevation of the said lamp inanother position and is partly in vertical section.
  • the electric incandescent lamp shown in Fig. 1 is of a well-known type used for projection purposes and is of the general type disclosed in Halvorson Patent No. 1,591,911. It comprises a coiled tungsten filament 10 supported upon leads, the portions 11 of which are usually of tungsten. As shown in Fig. 2, in this type of lamp, which is of high wattage and which contains a mixture of argon and nitrogen as a gas-filling, the leads at their seal portions are of tungsten and are separately sealed in the glass tubular extensions 12 of a stem having a flange 13 which is sealed to the bulb 14.
  • the base 15 comprises pins 16 which receive and are united to the outer ends of the leads. asbestos 17 is usually packed around the leads in the tubular extensions '12.
  • An exhaust Material such as tube 18 is sealed to the stem so that one end thereof opens into the interior of the bulb when thestem is sealed thereto.
  • the other end of the said exhaust tube remains open until after the tungsten powder is inserted and the lamp has been exhausted and filled with the nitrogen and argon gas after which it is sealed off at 19.
  • the tungsten powder is indicated at 20. It is inserted before the exhaust by simply pouring the powder in through the open exhaust tube and a funnel may be conveniently used for this purpose. I have found that to get the best results, the tungsten powder should be coarser than 200 mesh. WVhen the lamp is in the upright position, as shown in Fig. 2, the tungsten powder will collect at the bottom in the annular space 21 between the stem and the bulb neck.
  • the inner bulb surface will become coated with a dark deposit which will gradually obscure the light and if not removed will ultimately render the lamp practically useless.
  • the rate of this deposit accelerates on account of the fact that as it forms the temperature which the lamp reaches increases on account of absorption. This may ultimately cause the glass to de-vitrify.
  • the deposit on the inner surface of the bulb may be removed from time to time simply by turning the lamp to the position shown in Fig. 1 thus causing the tungsten powder to collect at the middle portion thereof, as shown in the drawings, and then rotating the lamp to cause the tungsten powder to scrape the deposit.
  • the tungsten is a very heavy metal and as the bulb is turned, the pressure on the deposit is considerable.
  • the deposit appears to be less firmly attached to the bulb surface than in vacuum lamps.
  • an electric lamp or similar device comprising a translation element which is heated to high temperature during operation and which is enclosed in a hermetically sealed transparent container, a deposit removing means consisting'of loose granules of a highly refractory material of substantially the same composition as, the said translation element.
  • a hermetica ly seal I 2 In an electric lamp or similar device comprising an energy translation element composed substantiall of tuxprgsten and entransparent container, a deposit removingmeans consisting .of loose granules of a highly refractory material comprising tungsten.
  • a deposit removing means consisting of loose granules of a highly refractory material of substantially the same composition as the said filament.
  • a deposit removing means consisting of loose granules of tungsten.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US341004A 1929-02-18 1929-02-18 Electric lamp Expired - Lifetime US1809661A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL50283D NL50283B (de) 1929-02-18
NL28546D NL28546C (de) 1929-02-18
US341004A US1809661A (en) 1929-02-18 1929-02-18 Electric lamp
GB20547/29A GB337782A (en) 1929-02-18 1929-07-04 Improvements in and relating to electric lamps and the like
FR702878D FR702878A (fr) 1929-02-18 1930-02-14 Perfectionnements aux lampes électriques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US341004A US1809661A (en) 1929-02-18 1929-02-18 Electric lamp

Publications (1)

Publication Number Publication Date
US1809661A true US1809661A (en) 1931-06-09

Family

ID=23335861

Family Applications (1)

Application Number Title Priority Date Filing Date
US341004A Expired - Lifetime US1809661A (en) 1929-02-18 1929-02-18 Electric lamp

Country Status (4)

Country Link
US (1) US1809661A (de)
FR (1) FR702878A (de)
GB (1) GB337782A (de)
NL (2) NL28546C (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060017367A1 (en) * 2003-02-20 2006-01-26 Ip2H Ag Light source

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060017367A1 (en) * 2003-02-20 2006-01-26 Ip2H Ag Light source

Also Published As

Publication number Publication date
NL50283B (de)
FR702878A (fr) 1931-04-18
NL28546C (de)
GB337782A (en) 1930-11-04

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