US3685881A - Methods of making incandescent lamps - Google Patents

Methods of making incandescent lamps Download PDF

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Publication number
US3685881A
US3685881A US52923A US3685881DA US3685881A US 3685881 A US3685881 A US 3685881A US 52923 A US52923 A US 52923A US 3685881D A US3685881D A US 3685881DA US 3685881 A US3685881 A US 3685881A
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US
United States
Prior art keywords
bulb
exhaust tube
filament
conductors
opening
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
US52923A
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English (en)
Inventor
Jean Rochet
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.)
Individual
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Individual
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Filing date
Publication date
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Application granted granted Critical
Publication of US3685881A publication Critical patent/US3685881A/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
    • 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
    • H01K3/20—Sealing-in wires directly into the envelope

Definitions

  • An exhaust tube is then placed partially inside the bulb through the opening with the conductors passing between the tube and the edge of the wall of the bulb surrounding the opening.
  • the exhaust tube is then sealed to the bulb and the interior of the bulb subjected to a vacuum.
  • the exhaust tube is then sealed and a cap is threaded over the exhaust tube on to the sealed joint between the exhaust tube and the bulb.
  • the cap has two contact members for electrical connection to the conductors.
  • An object of the present invention is to provide a method which substantially minimises the above mentioned disadvantages.
  • a method of manufacturing an incandescent lamp including a bulb, a filament positioned within the bulb, and a cap positioned over at least a portion of the bulb and having two electrical contacts, comprises the steps of passing the filament and a filament support into the bulb through an opening in the bulb, electrical conductors from the filament emerging from the opening in the bulb, placing an exhaust tube partially inside the bulb through the opening, the conductors passing between the exhaust tube and the bulb, heat sealing the exhaust tube to the bulb, subjecting the interior of the bulb to a vacuum, hermetically sealing the exhaust tube and threading the cap over the exhaust tube for connection to the sealed joint between the exhaust tube and the bulb, the cap having two electrical contacts for electrical connection to the conductors.
  • FIG. 1 is a cross-section of a bulb, and of an exhaust tube ready to be placed in the bulb;
  • FIG. 2 is a cross-section of the bulb and of the exhaust tube, the latter having been placed in the upper part of the bulb;
  • FIG. 3 is an elevation of the bulb and the exhaust tube after heat sealing
  • FIG. 4 is a top plan view of the exhaust tube after heat sealing
  • FIG. 5 is an elevation of the bulb and the exhaust tube after the exhaust tube has been heated then drawn out for heat sealing the tube;
  • FIG. 6 is an elevation of the bulb after sealing and separation of the exhaust tube.
  • FIG. 7 is an elevation of a lamp.
  • a glass bulb has a drawn neck 2 at an open end.
  • the first operation of the method according to the invention consists of inserting an electrical unit comprising a filament 3, its support 4, made, for example, of glass and two conductors 5 and 6 for the current to the filament, through the neck 2. The ends of these conductors emerge from the bulb and are bent outwards at the level of the neck.
  • the bulb 1 is placed head downwards so that, during the first operation, the electrical unit enters the bulb 1 under gravity.
  • one end of an exhaust tube 7, i.e. a glass tube intended to form the vacuum is inserted through the neck 2 to a length equal to the length of the neck 2.
  • the external diameter of the exhaust tube 7 is slightly smaller than the interior diameter of the neck so that sufficient clearance exists for the exhaust tube 7 to be inserted despite the presence of the conductors 5 and 6 which are situated between the exhaust tube 7 and the neck 2.
  • a third operation the group of parts composed of the neck 2, the end of the exhaust tube 7 and the parts of the conductors 5 and 6 outside the bulb 1 are gripped by a device (not shown) which both heats the glass of the neck 2 and exerts a closing pressure.
  • a needle of tungsten, a metal with a very high fusion point is fed through the exhaust tube 7, to prevent the inner surface of the exhaust tube being deformed under the effect of the heat.
  • the neck 2 and the end of the exhaust tube 7 are thus heat sealed and the mark left by the closing pressure device can be, for example, of a square shape (FIG. 4).
  • the tungsten needles is withdrawn and a vacuum is produced inside the bulb, through exhaust tube 7.
  • the exhaust tube 7 is hermetically cut and sealed by heat as indicated by arrows A.
  • the exhaust tube 7 is drawn out, for example, by the weight of the bulb 1 and its contents.
  • the lamp is in the shape of a drop glass 8 (as seen in FIG. 6) from which the conductors 5 and 6 emerge.
  • a metal cap 9 is threaded over the end of the bulb 2 and two electrical contacts in the form of studs 10 and 11 for electrical connection are made thereon.
  • the cap 9 has, at its rear end, a drilled insulating ring 12 through which the conductor 6 is brought out, enabling contact 1 l to be soldered.
  • this can be made, for example, by leading conductor 5 out between the cap and the wall of the bulb, or by leading this conductor through a hole made in the front part of the cap.
  • the cap itself can be attached to the rear part of the bulb by cold or hot gluemg.
  • two contact studs can be placed, for example, at the rear part of the cap; pins can also be introduced.
  • a method of manufacturing an incandescent lamp including a bulb, a filament positioned within the bulb and a cap positioned over at least a portion of the bulb and having two electrical contacts, the method comprising the steps of passing the filament and a filament support into the bulb through an opening in the bulb electrical conductors from the filament emerge from hermetically sealing the exhaust tube and threading the cap over the exhaust tube for connection to the sealed joint between the exhaust tube and the bulb, the cap having two electrical contacts for electrical connection to the conductors.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Electric Stoves And Ranges (AREA)
US52923A 1969-08-06 1970-07-07 Methods of making incandescent lamps Expired - Lifetime US3685881A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6927006A FR2055909A5 (enrdf_load_stackoverflow) 1969-08-06 1969-08-06

Publications (1)

Publication Number Publication Date
US3685881A true US3685881A (en) 1972-08-22

Family

ID=9038704

Family Applications (1)

Application Number Title Priority Date Filing Date
US52923A Expired - Lifetime US3685881A (en) 1969-08-06 1970-07-07 Methods of making incandescent lamps

Country Status (7)

Country Link
US (1) US3685881A (enrdf_load_stackoverflow)
BE (1) BE753587A (enrdf_load_stackoverflow)
DE (1) DE2035556A1 (enrdf_load_stackoverflow)
FR (1) FR2055909A5 (enrdf_load_stackoverflow)
GB (1) GB1263846A (enrdf_load_stackoverflow)
LU (1) LU61461A1 (enrdf_load_stackoverflow)
NL (1) NL7005242A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5378183A (en) * 1993-04-12 1995-01-03 Preston; Daniel Method of manufacturing electrodes

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2122117A (en) * 1937-05-07 1938-06-28 Electronics Supply Corp Reconditioning electronic unit
US2359483A (en) * 1942-10-17 1944-10-03 Gen Electric Vitreous electrical device and its fabrication
US2914371A (en) * 1955-06-16 1959-11-24 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Method of making miniature lamps
US2946641A (en) * 1957-08-28 1960-07-26 Corning Glass Works Lamp manufacture

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2122117A (en) * 1937-05-07 1938-06-28 Electronics Supply Corp Reconditioning electronic unit
US2359483A (en) * 1942-10-17 1944-10-03 Gen Electric Vitreous electrical device and its fabrication
US2914371A (en) * 1955-06-16 1959-11-24 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Method of making miniature lamps
US2946641A (en) * 1957-08-28 1960-07-26 Corning Glass Works Lamp manufacture

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5378183A (en) * 1993-04-12 1995-01-03 Preston; Daniel Method of manufacturing electrodes
USRE36055E (en) * 1993-04-12 1999-01-19 Preston; Daniel Method of manufacturing electrodes

Also Published As

Publication number Publication date
DE2035556A1 (de) 1971-02-25
NL7005242A (enrdf_load_stackoverflow) 1971-02-09
LU61461A1 (enrdf_load_stackoverflow) 1971-06-14
FR2055909A5 (enrdf_load_stackoverflow) 1971-05-14
BE753587A (fr) 1970-12-31
GB1263846A (en) 1972-02-16

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