US2945978A - Tubular incandescent lamp device - Google Patents

Tubular incandescent lamp device Download PDF

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Publication number
US2945978A
US2945978A US800424A US80042459A US2945978A US 2945978 A US2945978 A US 2945978A US 800424 A US800424 A US 800424A US 80042459 A US80042459 A US 80042459A US 2945978 A US2945978 A US 2945978A
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US
United States
Prior art keywords
filament
envelope
lamp
lamp device
discs
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
US800424A
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English (en)
Inventor
William F Hodge
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 US800424A priority Critical patent/US2945978A/en
Priority to DEG29012A priority patent/DE1117745B/de
Priority to FR821359A priority patent/FR77363E/fr
Application granted granted Critical
Publication of US2945978A publication Critical patent/US2945978A/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
    • H01K1/18—Mountings or supports for the incandescent body
    • H01K1/24—Mounts for lamps with connections at opposite ends, e.g. for tubular lamp

Definitions

  • Myinvention relates. generally to electric incandescent lamp devices, andmore particularly to elongated 1ncandescent lampshaving a helically coiled filament extendingaxially of an enclosing] sealed tubular envelope and secured: at'its ends to.terminal membersat the respective ends of .the envelope.
  • Such lamps have been provided with means for sup: porting the. coiled tungsten wire filament in spaced relation from the walls of the envelope, in the form of a plurality of transverse support members spaced along the length of the filament and fixedly secured thereto and peripherally engageable with the inner wall of the envelope.
  • the support members may, for example, take the form of wire spirals or, preferably, sheet metal wafers or discs concentrically aflixed to the filament and having a diameter slightly smaller than the internal diameter of the envelope.
  • lamps are intended primarily for operationin a horizontal position. Although it is feasible to operate lamps of relatively short length in a vertical posit on, lamps of longer length cannot be operated 1n a vertical position for very long because of filament distortion.
  • the Weight of the filament causes the turns in the upper part thereof to be stretched at the operating temperature of about 2400 K. or higher, resulting in buckling of the lower part of the filament.
  • the hot filament touches the envelope wall and causes cracking and then failure of the lamp due to air leakage.
  • quartz heat lamps of this type having a length of about 10 inches this takes a relatively long time, and lamp life may be about two or three thousand hours; however, this is considerably below the normal design life of about 5000 hours or more for such lamps. In lamps of about 25 inch length, however, the life may be reduced to as little as 100 to 200 hours.
  • the prior art transverse support members are retained and, after assembly of the filament and its supports Within the vitreous envelope, the envelope walls are locally heated at points adjacent to at least some of the support members to produce small indentations forming inwardly projecting shoulders which are adapted to be located under and engaged by peripheral portions of the said support members when the lamp is disposed vertically, whereby to prevent the supports from sliding downward when the filament is heated, and thus keeping the filament in place.
  • Fig. 1 is..a vertical elevation, partly insection, of a lamp. comprisingrnylinvention; and.
  • Fig. 2 isa fragmentaryperspective view of a portion of the filament and an associated support member.
  • the lamp comprises an elongated tubular envelope 1, preferably of quartz of small diameter, for example inch, and containing an atmosphere of inert gas, preferably argon, at a pressure preferably somewhatunder atmospheric at room tempera: ture, say about550 mm. of mercury.
  • a helically coiled tungsten wire filament 2- extends axially of the envelope 1 and-is secured at'its ends to terminal members preferably consisting of molybdenum wire Shaving extremely thin (.0005 to .0010 inch) intermediate foliatedor ribbon portions. 4 sealed incompressed pinch sealportions 5 at the respective ends of the envelope. The filament under slight tension by virtue of having been stretched slightly during the sealing of-the lead wires- 3 into the pinch or press portions 5.
  • a plurality of transverse support members 6, preferably in the form of wafers or discs of tantalum sheet metal located at spaced intervals of about one inch and having a diameter slightly lessthan the interior diameter of the envelope 1.
  • the discs 6 are preferably of the type disclosed and claimed in the aforesaid Fridrich Patent 2,8-13,9 93 and are securedly fixedto the filament, preferably by the method and apparatus disclosed and claimed in Patent 2,813,327, Fridrich.
  • Each of the discs 6 is disposed transversely between two successive turns of the filament coil 2 and is pierced interiorly of the coil to form a central aperture with a short collar portion comprising tabs or tongues 7 curled about the adjacent turn of the filament coil to securely lock the disc to the filament.
  • the disc is provided with a radial slit 8 which is flared at 9 to facilitate insertion of the filament wire into the slit prior to formation of the tabs 7.
  • the filament 2 is subject to stretching and distortion when the lamp is operated in a vertical position.
  • this is prevented by the provision of means to support the filament at intervals along its length so that it cannot stretch sufliciently to buckle.
  • This is accomplished by the provision of inwardly projecting shoulders 10 located under some of the disc supports 6 and serving to keep the discs from sliding downward, thereby keeping the filament in place.
  • sufiicient support is aiforded by providing the shoulders 10 under every fifth disc 6 when said discs are spaced one inch apart.
  • the spacing of the shoulders 10 may be varied for filament coils having different values of weight per unit of length.
  • the shoulders 10 are formed, after assembly of the lamp has been completed, by heating the quartz envelope 1 next to the disc supports 10 with a fine oxyhydrogen torch flame indicated at 11 whereby, under the subatmospheric pressure in the envelope, the wall thereof is drawn in to produce a small indentation forming a shoulder '10.
  • Two such indentations at diametrically opposed points adjacent each disc 6 have been found to be effective, although a greater number may of course be employed when desired.
  • the shoulders may be provided at both sides of the discs, as indicated by the shoulders 10' in Fig. 1, whereby to support the discs when the lamp is operated with either end uppermost.
  • the said indentations do not in any way interfere with the threading of the filament 2 and its attached supports 6 and leads 3 into the envelope 1 before the seals 5 are formed.
  • An incandescent electric lamp device comprising a sealed elongated tubular. envelope of vitreous material, current supply terminals sealed in the respective ends of said envelope, a helically coiled wire filament extending longitudinally within said envelope and electrically connected at its ends to said terminals, means supporting said filament in spaced relation from the walls of said envelope comprising a plurality of transverse support members spaced along the length of said filament and fixedly secured thereto and peripherally engageable with the inner wall of said envelope, said envelope having indentations in portions of its walls contiguous to at least one side of at least some of said support members, said indentations forming inwardly projecting shoulders adapted to be located under and engaged by peripheral portions of said support members when the lamp device is vertically disposed whereby to support the coiled filament against sagging longitudinally during operation at incandescence.
  • An incandescent electric lamp device comprising a sealed elongated tubular envelope of vitreous material and adapted to be vertically disposed in normal use, current supply terminals sealed in the respective ends of said envelope, 9. helically coiled wire filament extending long itudinally within said envelope and electrically connected at its ends to said terminals, means supporting said filament in spaced relation from the walls of said envelope comprising a plurality of transverse support members spaced along the length of said filament and fixedly secured thereto and peripherally engageable with the inner wall of said envelope, said envelope having indentations in portions of its walls contiguous to and under at least some of said support members, said indentations forming inwardly projecting shoulders engaged by peripheral portions of said support members to support the coiled filament against sagging longitudinally downward during operation at incandescence.
  • An incandescent electric lamp device comprising a sealed elongated tubular envelope of vitreous material, current supply terminals sealed in the respective ends of said envelope, a helically coiled Wire filament extending longitudinally within said envelope and electrically connected at its ends to said terminals, means supporting said filament in spaced relation from the walls of said envelope comprising a plurality of transverse discs spaced along the length of said filament and fixedly secured thereto concentrically of the filament and peripherally engageable withthe inner wall of said envelope, said envelope having indentations in portions of its walls contiguous to at least one side of at least some of said discs, said indentations forming inwardly projecting shoulders adapted to be located under and engaged by peripheral portions of said discs when the lanip device is verti-' cally disposed whereby to support the coiled filament against sagging longitudinally during operation at incandescence.

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  • Resistance Heating (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US800424A 1959-03-19 1959-03-19 Tubular incandescent lamp device Expired - Lifetime US2945978A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US800424A US2945978A (en) 1959-03-19 1959-03-19 Tubular incandescent lamp device
DEG29012A DE1117745B (de) 1959-03-19 1960-02-12 Rohrfoermige elektrische Gluehlampe
FR821359A FR77363E (fr) 1959-03-19 1960-03-15 Lampe électrique et appareils analogues

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US800424A US2945978A (en) 1959-03-19 1959-03-19 Tubular incandescent lamp device

Publications (1)

Publication Number Publication Date
US2945978A true US2945978A (en) 1960-07-19

Family

ID=25178349

Family Applications (1)

Application Number Title Priority Date Filing Date
US800424A Expired - Lifetime US2945978A (en) 1959-03-19 1959-03-19 Tubular incandescent lamp device

Country Status (3)

Country Link
US (1) US2945978A (fr)
DE (1) DE1117745B (fr)
FR (1) FR77363E (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3039015A (en) * 1958-09-04 1962-06-12 Gen Electric Co Ltd Devices for producing light or infra-red radiation
US3173051A (en) * 1962-04-19 1965-03-09 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Lamp filament support
US3629642A (en) * 1970-01-29 1971-12-21 Wagner Electric Corp Insulated filament supports
US4839559A (en) * 1988-02-22 1989-06-13 General Electric Company Radiant energy incandescent lamp
US20170181560A1 (en) * 2015-12-25 2017-06-29 Zhibin Zhou Assembled christmas tree

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1267765B (de) * 1962-12-07 1968-05-09 Hans Fritz Verschluss eines Infrarotstrahlers

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US821470A (en) * 1903-12-19 1906-05-22 Gen Electric Electric lamp.
US1306912A (en) * 1919-06-17 Electric lamp
US1963008A (en) * 1934-04-10 1934-06-12 Raytheon Production Corp Radio tube construction
US2219111A (en) * 1937-11-19 1940-10-22 Emi Ltd Cathode ray tube
US2813993A (en) * 1954-09-17 1957-11-19 Gen Electric Electric lamp or similar device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1306912A (en) * 1919-06-17 Electric lamp
US821470A (en) * 1903-12-19 1906-05-22 Gen Electric Electric lamp.
US1963008A (en) * 1934-04-10 1934-06-12 Raytheon Production Corp Radio tube construction
US2219111A (en) * 1937-11-19 1940-10-22 Emi Ltd Cathode ray tube
US2813993A (en) * 1954-09-17 1957-11-19 Gen Electric Electric lamp or similar device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3039015A (en) * 1958-09-04 1962-06-12 Gen Electric Co Ltd Devices for producing light or infra-red radiation
US3173051A (en) * 1962-04-19 1965-03-09 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Lamp filament support
US3629642A (en) * 1970-01-29 1971-12-21 Wagner Electric Corp Insulated filament supports
US4839559A (en) * 1988-02-22 1989-06-13 General Electric Company Radiant energy incandescent lamp
US20170181560A1 (en) * 2015-12-25 2017-06-29 Zhibin Zhou Assembled christmas tree

Also Published As

Publication number Publication date
DE1117745B (de) 1961-11-23
FR77363E (fr) 1962-02-23

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