US2410061A - Method of sealing lead-in conductors - Google Patents

Method of sealing lead-in conductors Download PDF

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Publication number
US2410061A
US2410061A US444664A US44466442A US2410061A US 2410061 A US2410061 A US 2410061A US 444664 A US444664 A US 444664A US 44466442 A US44466442 A US 44466442A US 2410061 A US2410061 A US 2410061A
Authority
US
United States
Prior art keywords
bead
glass
conductor
lead
conductors
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
US444664A
Other languages
English (en)
Inventor
Lynn C Goodale
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.)
STC PLC
Federal Telephone and Radio Corp
Original Assignee
Standard Telephone and Cables PLC
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
Priority to BE472151D priority Critical patent/BE472151A/xx
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to US444664A priority patent/US2410061A/en
Application granted granted Critical
Publication of US2410061A publication Critical patent/US2410061A/en
Priority to FR938803D priority patent/FR938803A/fr
Priority to CH264117D priority patent/CH264117A/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
    • H01J9/32—Sealing leading-in conductors

Definitions

  • This invention relates to metal-to-glass seals and more particularly to seals for vacuum tube lead-in conductors.
  • the glass seal to the lead-in conductor externally of the tube should be of such a form that the glass has a reentrant cusp portion or invert at the point of sealing to theconductor. This has generally been accomplished by forming a glass head on the conductor with the invert formation and then sealing the glass flare to this beading without destroying the condition at the conductor.
  • This invert is not deirable with copper conductors, but has been found desirable for common types of lead-in conductors such as tungsten.
  • a lead-in conductor is provided with a glass bead which need not be especially formed with a reentrant part or invert. is then sealed to this bead.
  • This sealing is accomplished by arranging the conductor within a tubular extension on the flare arrangement so that the bead is supported at a point below the upper end of this extension.
  • the glass is then heated to soften it and as it droops inwardly due to the softening first contacts and seals to the bead about the wire and then further falls inwardly to complete a seal to the part of the bead adjacent the wire and will inherently have the desired invert.
  • FIG. 1 illustrates a tube base plate or flare
  • Fig. 2 a beaded conductor
  • Fig. 1 a tube base or lead-in flare arrangement H1, provided with tubular extending portions II and I2, all substantially identical in form.
  • the shape of these extensions may be more readily seen by reference to Fig. 3.
  • Extensions II are generally used for lead-in seals, while extension I2 may be used for the connection of an exhaust tube for exhausting the completed vacuum tube.
  • the lead-in conductor for example of tungsten, is shown at l3, Fig. 2, and is provided with a The tube base or flare glass bead it formed with an enlarged portion 15 at one end thereof.
  • the glass bead 14- may be formed by arranging a small tube on the lead and melting it to seal thereto and then winding on the tubular bead another glass portion, which is then shaped by a graphite paddle or other means to produce the enlarged portion l5.
  • Lead-in conductor I3 is then arranged. to extend through the extension ll so that the portion l5 of bead i4 is positioned slightly below the upper end l6 of flare H.
  • the work may be supported in a jig for this purpose and it should be understood that all of the lead-in conductors may be simultaneously supported in a similar position with relation to all of the tubular extensions II of the flare.
  • the completed seal thus has an invert H at the place where it contacts to lead-in conductor l3.
  • the glass doe not seal the conductor at this point, the glass seal with the conductor being solely formed by the bead.
  • the invention is particularly useful for all types of lead-in conductors for vacuum tubes, although itis clear that the principles of my invention apply anywhere where rods of the type described are to be sealed to glass, and the form of reentrant or invert seal is desired. It should be distinctly understood that the features of my invention apply to any system wherein a rod is to be sealed through a glass. Furthermore, while its tubular extensions i l are shown to be slightly frusto-conical in form and this shape is generally desirable, the principles of my invention apply as well if the tube is made perfectly straight sided.
  • tubular extension is frusto-conical in form narrowing toward its free end, and said enlarged end of the bead is substantially the diameter of the smaller opening of said frusto-conical exten- S1011.
  • the method of sealing a lead-in conductor through a glass wall comprising positioning a rod having a glass bead sealed around it intermediate its ends, along the axis of an open tube formed in said glass wall of frustoeconical shape narrowing toward its free end, said bead having a cylindrical end portion smaller in diameter than the free end of said frusto-conical tube but large enough to be fused to the tube when the latter is heated, supporting said rod in a position such that said end portion is below the free end of said frusto-conical tube, heating said tube at the upper end thereof until the softened glass drops inwardly first sealing to the outer edges of said glass bead, and then to the upper portion of said contact with said rod.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Joining Of Glass To Other Materials (AREA)
US444664A 1942-05-27 1942-05-27 Method of sealing lead-in conductors Expired - Lifetime US2410061A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE472151D BE472151A (enrdf_load_stackoverflow) 1942-05-27
US444664A US2410061A (en) 1942-05-27 1942-05-27 Method of sealing lead-in conductors
FR938803D FR938803A (fr) 1942-05-27 1946-11-21 Perfectionnements aux scellements métal-verre
CH264117D CH264117A (fr) 1942-05-27 1947-05-20 Procédé de scellement métal-verre.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US444664A US2410061A (en) 1942-05-27 1942-05-27 Method of sealing lead-in conductors

Publications (1)

Publication Number Publication Date
US2410061A true US2410061A (en) 1946-10-29

Family

ID=23765842

Family Applications (1)

Application Number Title Priority Date Filing Date
US444664A Expired - Lifetime US2410061A (en) 1942-05-27 1942-05-27 Method of sealing lead-in conductors

Country Status (4)

Country Link
US (1) US2410061A (enrdf_load_stackoverflow)
BE (1) BE472151A (enrdf_load_stackoverflow)
CH (1) CH264117A (enrdf_load_stackoverflow)
FR (1) FR938803A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
FR938803A (fr) 1948-10-26
CH264117A (fr) 1949-09-30
BE472151A (enrdf_load_stackoverflow)

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