US2427711A - Electric lamp and seal therefor - Google Patents

Electric lamp and seal therefor Download PDF

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Publication number
US2427711A
US2427711A US578306A US57830645A US2427711A US 2427711 A US2427711 A US 2427711A US 578306 A US578306 A US 578306A US 57830645 A US57830645 A US 57830645A US 2427711 A US2427711 A US 2427711A
Authority
US
United States
Prior art keywords
cap
seal
tube
flare
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
US578306A
Other languages
English (en)
Inventor
Paul O Cartun
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 US578306A priority Critical patent/US2427711A/en
Priority to FR54445D priority patent/FR54445E/fr
Priority to US693356A priority patent/US2522990A/en
Application granted granted Critical
Publication of US2427711A publication Critical patent/US2427711A/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
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/32—Seals for leading-in conductors
    • H01J5/44—Annular seals disposed between the ends of the vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/40—Closing vessels
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/38—Seals for leading-in conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0033—Vacuum connection techniques applicable to discharge tubes and lamps
    • H01J2893/0034—Lamp bases
    • H01J2893/0036—Lamp bases having wires, ribbons or tubes placed between two vessel walls and being perpendicular to at least one of said walls

Definitions

  • This invention relates to electrical devices, including incandescent lamps and various kinds of electric discharge devices.
  • An object of the invention is to improve and simplify such devices and their manufacture, including their bases or contact terminals and their exhaust connections and seals.
  • the invention is especially adaptable and advantageous for rather small lamps and devices, and particularly lamps useful for decorative purposes, such as Christmas tree lighting strings and the like, as well as lamps for automobile dome or dash lighting. Lamps of this character are exemplified in U. S. Patents Nos. 2,191,346 to Geiger, 2,221,868 to Geiger and Davidson, and 2,240,331 to Geiger and Ayres, and I have hereinafter explained my invention as applied to such lamps.
  • Various features and advantages of theinventlon will become apparent from the description of a species and form of embodiment, and from the drawings.
  • Fig. 1 shows a vertical axial section through an electric lamp conveniently embodying the invention
  • Figs. 2 and 3 are fragmentary axial sectional views illustrating stages in its fabrication
  • Fig. 4 is a similar view illustrating a variant construction.
  • Fig. 1 The invention is illustrated in Fig. 1 as embodied in a vitreous envelope I provided with contact terminals at different portions thereof: viz. the rather oval glass envelope I shown has at opposite ends reduced portions or necks 2, 2 which are closed by attached tubular sheet metal caps 3, 4 whose main portions (as shown on a larger scale in Figs. 2 and 3) may taper somewhat to facilitate forming them by die-stamping.
  • the tubular caps 3, 4 have external rims or flanges 5, 5 against which the bulb ends 2, 2 abut endwise and are sealed by fusion of the glass.
  • these rims 5, 5 have marginal lips '6, 6 which surround and protect the joints, and may even adhere to the fused seals.
  • the electric translation means of this particular device consists of an incandescent filament of fine tungsten wire 1 extending more or less axially through the envelope I, and preferably coiled in a fine helix.
  • This filament I may be connected between the contact terminal caps 3, 4 by means of lead-wires 8, 9 clamped tight on the filament ends.
  • the upper lead 8 is welded directly to the inner surface of the rim or flange 5 of its cap 3 at I0, while the lower lead 5 extends out through the fused end of the neck 2 which seals to the cap 4 and is electrically connected to the latter out- 2 side the seal, as by spot welding the lead to the lip 6 at II.
  • the envelope I may be exhausted through an exhaust tube I3 extending outthrough the open end of the cap 4, as shown in Fig. 3, after which the tube may be sealed oil. as shown at I4 in Fig. 1, substantially or approximately at the open end of the cap.
  • the ends of the caps 3, 4 may serve as contact terminals for connecting the device in circuit, as shown for instance in Patent No. 2,240,- 331 cited above, the originally open end of the cap 4 must, of course, be kept free of adherent glass which might prevent it from actually engaging the corresponding circuit contact.
  • the exhaust tube I3 is small enough to extend through the open lower cap end I2 with some clearance around it, but is enlarged or flared at its upper end I5 to a size which overlaps the corner or shoulder I6 where the flange 5 joins the tubular portion of the cap. If the flare I5 is simply fused to the corner I6 at the junction of the flange 5 with the cap 4 by heating the parts, the resulting seal covers only a narrow zone at the corner I6. What is more important, cracks tend, to develop in the seal where the side of the flare diverges from the inner surface of the cap at an angle about corresponding to the acute angle marked A in Fig. 2.
  • the flare can be brought inside the tubular main portion of the cap 4, with the effect of extending its peripheral seal over a wider zone I! of the internal cap surface extending below the corner I8, as shown in Fig. '3.
  • the fused seal portion of the flare at I! is in longitudinal contact with the inner surface of the cap over a distance substantially greater than the thickness-of the tube I3. This results in a larger angle B between the inner cap surface and the outer surface of the flare I5 remote from the corner I6, an angle B, greater than acute, which is at least a right angle, or preferably an obtuse angle.
  • the sealing of the tube l3 and its flare 15 to the cap 4 may most conveniently be done before sealing the cap 4 to the bulb neck 2.
  • the latter may be sealed off at l4, Fig. 1, by heat from any suitable source applied to the tube I3 below the cap 4, or to the lower portion of the cap, or both.
  • the cap 4 should be of metal that wets and seals well to the vitreous material of the bulb ends 2, 2, such as the chrome iron known commercially as Allegany 55 for a bulb l of ordinary lead or lime glass.
  • the leadwire 9 extends out through the seal of the corresponding bulb neck 2 above the uninterrupted edge of the flange lip 6, and is then bent down to its weld H to the flange.
  • Fig. 4 illustrates a variation in which the flange lip 6 is interrupted by a notch l8 about as deep as the lip, thus allowing thewire 8 to extend through the neck seal right at or very close to the upper face of the flange 5, and to be then bent aside to the weld II.
  • 'An electric lamp comprising a vitreous bulb with opposite necks, tubular metal caps having external flanges to which the bulb necks are sealed, at least one of said caps having an opening in its end, a current lead electrically connected to the other of said caps, and a current lead extending through the seal of the bulb neck to said open-ended cap and electrically connected to the latter outside the seal, with an electric fllarnent in said bulb connected between said current leads, and a vitreous flared tube having its flare peripherally sealed to the interior of the open-ended cap and itself sealed of! substantially at the open end of this cap.
  • vitreous bulb having a neck, of an externally flanged metal cap having its flange sealed to the bulb neck, and a vitreous flared tube having its flare peripherally sealed by fusion to the interior of said cap at and adjacent its Junction with said flange, and at the side of the flare remote from said junction diverging from the inner surface of the cap at an obtuse angle.
  • the combination with an externally flanged metal can of a vitreous flared tube having its flare peripherally sealed by fusion to the corner of said flange and to an adjacent zone of the interior of the cap, and at the side of the flare remote from said corner diverging from the inner surface of the cap at an angle greater than an acute angle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US578306A 1945-02-16 1945-02-16 Electric lamp and seal therefor Expired - Lifetime US2427711A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US578306A US2427711A (en) 1945-02-16 1945-02-16 Electric lamp and seal therefor
FR54445D FR54445E (fr) 1945-02-16 1946-02-14 Perfectionnements à la fabrication des lampes électriques
US693356A US2522990A (en) 1945-02-16 1946-08-27 Method of making glass-to-metal seals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US578306A US2427711A (en) 1945-02-16 1945-02-16 Electric lamp and seal therefor

Publications (1)

Publication Number Publication Date
US2427711A true US2427711A (en) 1947-09-23

Family

ID=24312300

Family Applications (1)

Application Number Title Priority Date Filing Date
US578306A Expired - Lifetime US2427711A (en) 1945-02-16 1945-02-16 Electric lamp and seal therefor

Country Status (2)

Country Link
US (1) US2427711A (fr)
FR (1) FR54445E (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4488082A (en) * 1983-01-21 1984-12-11 Invocas, Inc. Bi-fitted incandescent electric light bulbs with internal electrically parallel conductors

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US258965A (en) * 1882-06-06 Bdwaed weston
US1125694A (en) * 1909-04-10 1915-01-19 Westinghouse Lamp Co Incandescent lamp.
US1125744A (en) * 1909-05-19 1915-01-19 Westinghouse Lamp Co Incandescent lamp.
GB225038A (en) * 1923-11-02 1924-11-27 Edwin Rudolph Grote Improvements in incandescent electric lamps
US2191346A (en) * 1937-04-30 1940-02-20 Gen Electric Electric lamp or similar device and method of manufacture
US2217398A (en) * 1936-08-17 1940-10-08 Lorenz C Ag Electric discharge tube
US2229962A (en) * 1940-06-08 1941-01-28 Gen Electric Lamp base and socket

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US258965A (en) * 1882-06-06 Bdwaed weston
US1125694A (en) * 1909-04-10 1915-01-19 Westinghouse Lamp Co Incandescent lamp.
US1125744A (en) * 1909-05-19 1915-01-19 Westinghouse Lamp Co Incandescent lamp.
GB225038A (en) * 1923-11-02 1924-11-27 Edwin Rudolph Grote Improvements in incandescent electric lamps
US2217398A (en) * 1936-08-17 1940-10-08 Lorenz C Ag Electric discharge tube
US2191346A (en) * 1937-04-30 1940-02-20 Gen Electric Electric lamp or similar device and method of manufacture
US2229962A (en) * 1940-06-08 1941-01-28 Gen Electric Lamp base and socket

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4488082A (en) * 1983-01-21 1984-12-11 Invocas, Inc. Bi-fitted incandescent electric light bulbs with internal electrically parallel conductors

Also Published As

Publication number Publication date
FR54445E (fr) 1950-05-02

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