US2400946A - Lead-in seal structure - Google Patents

Lead-in seal structure Download PDF

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Publication number
US2400946A
US2400946A US528659A US52865944A US2400946A US 2400946 A US2400946 A US 2400946A US 528659 A US528659 A US 528659A US 52865944 A US52865944 A US 52865944A US 2400946 A US2400946 A US 2400946A
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United States
Prior art keywords
strips
rod
core
lead
jacket
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
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US528659A
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English (en)
Inventor
Evan H Nelson
Whittemore Jack
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
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General Electric Co
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Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
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Publication of US2400946A publication Critical patent/US2400946A/en
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Classifications

    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/10—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation

Definitions

  • Patented May 28, 1946 LEAD-IN SEAL STRUCTURE Evan H. Nelson, Harrow Weald, and Jack Whittemore, Wembley, England, assignors to General Electric Company, a corporation of New York Application March 30, 1944, Serial No. 528,659 In Great Britain November 18, 1942 2 Claims.
  • This invention relates to methods of sealing electric conductors through vitreous (especially quartz) walls of the type wherein the conductor, where it makes molecular contact with the vitreous material, consists of a plurality of thin strips lying between a vitreous core (often hollow) and a vitreous jacket collapsed onto the strips and the core.
  • Seals of this kind are usually made separately from the envelopes of which they eventually form part, and after manufacture are sealed into apertures in those envelopes. If, as is usual, the conductor is designed to carr twenty or more amperes, the seal is necessarily bulky and the aperture in the envelope into which it is sealed may have to be undesirably wide.
  • the necessary width of the aperture can be decreased'by joining the strips where they emerge from the inner end of the seal to a solid rod which, though its diameter is less than that of the core, may have a cross section Whose area is as great as the sum of the areas of the cross sections of the strips, and by continuing the said Jacket as a narrow tube surrounding the rod.
  • the aperture need then be only as wide as the narrower tube. But then it is not immediately obvious how to make a junction between the strips and the rod that is satisfactory both electrically and mechanically.
  • Fig. 1 is an elevation of a rod-like member forming part of a lead-in conductor
  • Fig. 2 is a plan view of another portion of the conductor
  • Fig. 3 is an elevation, in section, of a completed seal structure.
  • the said conductor in a method of sealing an electric conductor through a vitreouswall, of the type specified, preferably comprises the following parts, originally separate: (1) A rod reduced at one end to a pin of smaller diameter so that a shoulder is formed between the rod and the pin; (2) a cross piece having a plurality 11 (e. g. 4) of arms and a hole at its center through which the said pin i adapted to protrude; (3) a plurality n of strips each adapted to be welded to one of the said arms; and the said parts are assembled by welding the .said strips each to a said arm and uniting the cross piece to the rod by the use of the said pin as a rivet.
  • the riveting may be performed either before or after the welding.
  • the tungsten rod I is '70 mm. long and 4 mm.
  • the pin 2 at one end is 1.5 mm. long and 1 mm. in diameter.
  • the cross piece 3 is of molybdenum sheet' 0.1 mm. thick, and has the form of a square with 10 mm. sides, with arm pieces 4, each 9 mm. long and 10 mm. wide, prolonging its sides. A hole 5 just over 1 mm. in diameter pierces the center of the square.
  • the molybdenum strips 6 are each mm. long, 9 mm. wide and 0.05 mm. thick.
  • tags -'l are welded to the strips to serve as external leads, but these are not characteristic of the invention.
  • the pin 2 is pushed through the hole 5 so that the cross piece 3 rests on the shoulder between the pin 2 and the rod I.
  • the upper part Of the rod and the pin are heated in a flame and, when the pin is at a full red heat, it is hammered down so that it acts as a rivet uniting the cross piece to the rod.
  • the film of oxide resulting from this operation is removed by etching; the four strips 6 previously cleaned by etching are then welded to the four arms 4, as indicated in Figure 2; the strips overlap the arms over a length of some 3 mm. and the Welding is effected over substantially the whole area over which the strips and the arms contact.
  • the arms 4 with the strips 6 attached to them are now bent upwards from the plane of Figure 2 so that they lie roughly in the line of the rod.
  • the hollow quartz core 8 closed at its inner end, is now placed between the strips and rests on the cross piece.
  • the core is 18 mm. in external diameter and has walls 4 mm. thick.
  • the assembly of conductor and core is then placed within a quartz tubular Jacket with walls some 2 mm. thick, having a wider upper part 9, some 19 mm.
  • the lower end It is closed in order that the jacket may be evacuated during collapse in the usual manner.
  • the jacket is now heated so that it collapses onto the core 8 over substantially all its-length and onto the rod over the upper portion thereof.
  • the seal cools there is molecular contact between the jacket, the core, and the strips, but the quartz shrinks away from the thicker cross piece 3 and rod I.
  • the lower closed end 01' the jacket is now cut away; an electrode is attached to the free end or the rod; and the narrow part of the jacket is sealed into an aperture in an envelope, as indicated roughly at l2.
  • a seal structure of the class described comprising a vitreous core, a lead-in conductor comprising a plurality of spaced thin strips of metal extending along said core and terminating in a cross piece portion over one end of said core, a rod-like metal member in alignment with said core and having one end united to said cross piece portion of the conductor, and a vitreous Jacket surrounding said core and rod-like memleer, said strips being fused between the adiacent portions oi said core and Jacket.

Landscapes

  • Joining Of Glass To Other Materials (AREA)
  • Oxygen, Ozone, And Oxides In General (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US528659A 1942-11-18 1944-03-30 Lead-in seal structure Expired - Lifetime US2400946A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB16342/42A GB579236A (en) 1942-11-18 1942-11-18 Improvements in methods of sealing electric conductors through vitreous walls

Publications (1)

Publication Number Publication Date
US2400946A true US2400946A (en) 1946-05-28

Family

ID=10075553

Family Applications (1)

Application Number Title Priority Date Filing Date
US528659A Expired - Lifetime US2400946A (en) 1942-11-18 1944-03-30 Lead-in seal structure

Country Status (5)

Country Link
US (1) US2400946A (ru)
BE (1) BE463295A (ru)
FR (1) FR920660A (ru)
GB (1) GB579236A (ru)
NL (1) NL67973C (ru)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2632033A (en) * 1949-07-19 1953-03-17 Krefft Hermann Eduard Seal for electrical discharge devices

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2707472A (en) * 1949-02-12 1955-05-03 American Mach & Foundry Tobacco product and method of forming
US5584122A (en) * 1994-04-01 1996-12-17 Yazaki Corporation Waterproof connection method for covered wire with resin encapsulation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2632033A (en) * 1949-07-19 1953-03-17 Krefft Hermann Eduard Seal for electrical discharge devices

Also Published As

Publication number Publication date
BE463295A (ru)
GB579236A (en) 1946-07-29
NL67973C (ru)
FR920660A (fr) 1947-04-15

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