US3376460A - Conical shaped filament support - Google Patents

Conical shaped filament support Download PDF

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Publication number
US3376460A
US3376460A US488319A US48831965A US3376460A US 3376460 A US3376460 A US 3376460A US 488319 A US488319 A US 488319A US 48831965 A US48831965 A US 48831965A US 3376460 A US3376460 A US 3376460A
Authority
US
United States
Prior art keywords
filament
insert
coil
envelope
lamp
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
US488319A
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English (en)
Inventor
Keith O Jameson
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.)
GTE Sylvania Inc
Original Assignee
Sylvania Electric Products Inc
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 Sylvania Electric Products Inc filed Critical Sylvania Electric Products Inc
Priority to US488319A priority Critical patent/US3376460A/en
Priority to GB39147/66A priority patent/GB1114337A/en
Priority to DE19661539556 priority patent/DE1539556A1/de
Application granted granted Critical
Publication of US3376460A publication Critical patent/US3376460A/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
    • H01K1/00—Details
    • H01K1/02—Incandescent bodies
    • H01K1/16—Electric connection thereto
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/18—Mountings or supports for the incandescent body
    • H01K1/24—Mounts for lamps with connections at opposite ends, e.g. for tubular lamp

Definitions

  • This invention relates generally to incandescent lamps and more particularly to lamp filaments for use in tubular incandescent lamps.
  • Tubular lamps having high luminous efiiciency and long life such as iodine-quartz lamps, have found many practical applications throughout the lighting industry. These lamps exhibit their long life and high luminous efiiciency because of a regenerative-getter action occurring within the envelope during operation, in which tungsten iodide is produced fill gas combines chemically with particles of tungsten evaporating from the incandescent filament. Subsequent thermal decomposition of the tungsten iodide returns the tungsten particles to the filament to start the cycle anew.
  • circular spacers generally prepared of tungsten, have sometimes been positioned about the tungsten filament every one or two inches along its length, to prevent sagging when the filament is heated within the tubular glass envelope. In some instances where, for example, the filament is short or a special wire is used, such spacers have been eliminated.
  • a common construction for the tungsten filaments used in these lamps is a coil with unitary relatively straight legs at each end of the coiled body.
  • the filament was made from a continuous length of tungsten wire which was formed on a skip-space coiling machine where a starting straight leg of wire was first secured to a rotating head. Thereafter, the head was rotated about when iodine contained within 21 States Patent it is quite ima mandrel to form a coil. After a desired length was attained, the rotation of the head was stopped but the wire continued to advance axially to form a straight leg portion used for support and electrical connection of the coil. The wire was programmed to repeat the process thereby forming continuous coils joined by straight leg portions.
  • a continuous length of skip-space coiled wire was then taken up on a reel for further processing.
  • the coiling was then manually cut at the center of the straight portion into the individual filaments, since this type of skip-space coiling was not amenable to machine cutting.
  • the legs of the filament were straightened as much as possible and then sintered.
  • the mandrel was then removed by a conventional acid treatment.
  • the filament worked upon is quite breakable because of the crystal structure of drawn and sintered tungsten wire.
  • Normally drawn tungsten wire contains long strand-like fibers, but after annealing relatively small crystals are formed which are easily broken upon bending.
  • heating within precise limits is vital since the tensile strength of the stabilized or recrystallized wire is materially reduced.
  • a pair of inserts made from suitable refractory metal Wire, such as molybdenum or tungsten are formed in the shape of a tapered cone with a leg extending rearwardly therefrom.
  • the outside diameter of the cone at its widest point is substantially equal to the inside diameter of the coil.
  • the tapered or cone-shaped portion of the insert insures easy insertion at any angle. This is especially helpful when a coil is out, a burr or enlarged edge is frequently left. Therefore, entrance of the insert is restricted by this protrusion.
  • a feature of my invention is to form cone-shaped inserts of refractory metal wire to support straight legless coils.
  • legless coiled filament- 16 spaced from the wall envelope by circular spacers 20.
  • This particular type of filament is formed continuously on a mandrel of about 43 mils. having 110-120 turns per inch and in lengths of hundreds of meters. None of the conventional straight leg portions are formed.
  • the coil When manufactured, the coil is heat treated at 1200- 1700 C. and cut into suitable lengths. The cut coil is is then sintered and the mandrel removed after which the coil is inserted on a suitable rod for stabilization. The stabilized coil is completed and ready for insertion and scaling in a glass envelope.
  • the inserts 18 are formed of suitable refractory metal wire on a conical shaped mandrel.
  • the taper formed angle 26 that establishes the cone angle diminishes from the diameter of the mandrel which is about 43 mils, to a tightly wound coil end representing almost a point.
  • the wire is formed on the mandrel until at least two loops of the coil are Wound to an outside diameter of 43 mils which corresponds to the inside diameter of the finished coil 16. Also it is Wound to the same number of turns per inch.
  • the cone-shaped insert is then terminated in a rearwardly extending straight leg portion 28.
  • the corresponding mating diameters of at least two turns of the coiled insert and the inside diameter of the coil both have the same number of turns per inch. They provide a thread and screw arrangement whereby the coiled insert 18 can be screwed into the legless coil 16 providing the coil with support legs that can be electrically connected to the foil sections 22.
  • the tapered shape of the insert insures easy insertion at any starting angle, and as mentioned above when burrs are present on the ends of the coil, the insert can bypass this obstruction.
  • the tapered inserts not only provide easy assembly but since they are not stabilized they are still flexible enough to withstand internal strains.
  • An insert of the above-description is disposed in each end of the finished coil and with the above-described arrangement the coiled insert not only supports the filament but provides a positive electrical connection from a power source to the filament 16.
  • An electric incandescent lamp comprising: a tubular lamp envelope, having press seals disposed at each end thereof; a substantially coaxially disposed refractory wire filament having coiled end sections disposed in said envelope; an unstabilized conical shaped coiled conductive insert disposed in either end of said filament, said conical inserts being the sole means to convey current to said filament, each of said: inserts, being wound substantially to the same number of turns per inch as said end section of said filament, and having a leg extending rearwardly therefrom, whereby said conical shaped insert can be threaded into said coiled end portions of said filament thereby mechanically coupling said insert and said filament in positive electrical engagement, said leg being sealed in said press seal of said lamp envelope, and means to conduct current to each of said legs through said press seal.
  • An electric incandescent lamp comprising; a tubular lamp envelope, having press seals disposed at each end thereof; a substantially coaxially disposed refractory wire filament having coiled end sections disposed in said envelope; an unstabilized conical shaped coiled conductive insert having an outside diameter substantially the same as the inside diameter of said coiled end sections of said filament, said conical inserts being the sole means to convey current to said filament, and each of said inserts being wound substantially to the same number of turns per inch as the end sections of said filament and each having a leg extending rearwardly therefrom, whereby said conical shaped conductive insert is threaded into said coiled end portions of said filament thereby mechanically coupling and supporting said filament in positive electrical engagement, said leg extending rear of said insert is sealed into said envelope, and means to conduct current to each of said legs through said press seal.
  • An electric incandescent lamp comprising: a tubular lamp envelope, having press seals disposed at each end thereof, a substantially coaxially disposed refractory wire filament having coiled sections disposed in said envelope; an unstabilized conical shaped coiled conductive insert, the diameter of the cone progressing from a point to a diameter equal to the inside diameter of said filament, said conical inserts being the sole means to convey current to said filament, and Wound to the same number of turns per inch as said filament and thereafter terminating in a straight leg that extends rearwardly therefrom; whereby said conical shapedconductive insert is threaded into said coiled end portions of said filament thereby mechanically coupling and supporting said filament in positive electrical engagement, said leg being sealed through said press seals into said lamp envelope, and means to conduct current to each of said legs through said press seal.
  • An electric incandescent lamp comprising:
  • tubular lamp envelope having press seals disposed at each end thereof;
  • each of said inserts having a leg extending rearwardly therefrom and sealed in said press seal of said lamp envelope, and means to conduct current to each of said legs through said press seal.

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  • Resistance Heating (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US488319A 1965-09-20 1965-09-20 Conical shaped filament support Expired - Lifetime US3376460A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US488319A US3376460A (en) 1965-09-20 1965-09-20 Conical shaped filament support
GB39147/66A GB1114337A (en) 1965-09-20 1966-09-01 Incandescent lamps
DE19661539556 DE1539556A1 (de) 1965-09-20 1966-09-06 Quarz-Gluehlampe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US488319A US3376460A (en) 1965-09-20 1965-09-20 Conical shaped filament support

Publications (1)

Publication Number Publication Date
US3376460A true US3376460A (en) 1968-04-02

Family

ID=23939256

Family Applications (1)

Application Number Title Priority Date Filing Date
US488319A Expired - Lifetime US3376460A (en) 1965-09-20 1965-09-20 Conical shaped filament support

Country Status (3)

Country Link
US (1) US3376460A (de)
DE (1) DE1539556A1 (de)
GB (1) GB1114337A (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3431448A (en) * 1967-01-16 1969-03-04 Gen Electric Bromine regenerative cycle incandescent lamps
US3579021A (en) * 1969-04-30 1971-05-18 Sylvania Electric Prod Incandescent lamp having linear output
US3943395A (en) * 1974-12-06 1976-03-09 Gte Sylvania Incorporated Tubular incandescent lamp having spaced segments
DE2821317A1 (de) * 1977-05-24 1978-12-07 Philips Nv Elektrische halogengluehlampe
FR2427684A1 (fr) * 1978-06-01 1979-12-28 Philips Nv Lampe electrique a incandescence
US4959585A (en) * 1988-09-06 1990-09-25 General Electric Company Electric incandescent lamp and method of manufacture therefor
EP0438254A2 (de) * 1990-01-16 1991-07-24 Ge Lighting Limited Kreisförmige Heizungslampe
EP0475508A2 (de) * 1990-09-07 1992-03-18 Koninklijke Philips Electronics N.V. Elektrische Glühlampe
US5821678A (en) * 1995-09-04 1998-10-13 U. S. Philips Corporation Electric incandescent lamp having an improved filament support

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2305585B (en) * 1995-03-09 1999-02-10 Ge Lighting Ltd Heat source

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2007923A (en) * 1931-12-04 1935-07-09 Sirian Lamp Co Electric discharge lamp
US2342044A (en) * 1942-07-24 1944-02-15 Gen Electric Electric radiant energy device
US2449679A (en) * 1944-11-30 1948-09-21 Gen Electric Lamp filament support and connection

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2007923A (en) * 1931-12-04 1935-07-09 Sirian Lamp Co Electric discharge lamp
US2342044A (en) * 1942-07-24 1944-02-15 Gen Electric Electric radiant energy device
US2449679A (en) * 1944-11-30 1948-09-21 Gen Electric Lamp filament support and connection

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3431448A (en) * 1967-01-16 1969-03-04 Gen Electric Bromine regenerative cycle incandescent lamps
US3579021A (en) * 1969-04-30 1971-05-18 Sylvania Electric Prod Incandescent lamp having linear output
US3943395A (en) * 1974-12-06 1976-03-09 Gte Sylvania Incorporated Tubular incandescent lamp having spaced segments
DE2821317A1 (de) * 1977-05-24 1978-12-07 Philips Nv Elektrische halogengluehlampe
FR2427684A1 (fr) * 1978-06-01 1979-12-28 Philips Nv Lampe electrique a incandescence
US4959585A (en) * 1988-09-06 1990-09-25 General Electric Company Electric incandescent lamp and method of manufacture therefor
EP0438254A2 (de) * 1990-01-16 1991-07-24 Ge Lighting Limited Kreisförmige Heizungslampe
EP0438254A3 (en) * 1990-01-16 1991-11-13 Ge-Thorn Lamps Limited Circular heater lamp
EP0475508A2 (de) * 1990-09-07 1992-03-18 Koninklijke Philips Electronics N.V. Elektrische Glühlampe
US5140217A (en) * 1990-09-07 1992-08-18 North American Philips Corporation Electric lamp having a push-in filament insert for filament mounting
EP0475508A3 (en) * 1990-09-07 1992-09-23 N.V. Philips' Gloeilampenfabrieken Electric incandescent lamp
US5821678A (en) * 1995-09-04 1998-10-13 U. S. Philips Corporation Electric incandescent lamp having an improved filament support

Also Published As

Publication number Publication date
GB1114337A (en) 1968-05-22
DE1539556A1 (de) 1969-12-04

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