US2522062A - Vacuum tube seal - Google Patents

Vacuum tube seal Download PDF

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Publication number
US2522062A
US2522062A US683084A US68308446A US2522062A US 2522062 A US2522062 A US 2522062A US 683084 A US683084 A US 683084A US 68308446 A US68308446 A US 68308446A US 2522062 A US2522062 A US 2522062A
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US
United States
Prior art keywords
metal
tube
opening
fusible
vessel
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
US683084A
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English (en)
Inventor
Roovers Wilhelmus Antonius
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.)
Hartford National Bank and Trust Co
Original Assignee
Hartford National Bank and Trust 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 Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
Application granted granted Critical
Publication of US2522062A publication Critical patent/US2522062A/en
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
    • 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

Definitions

  • the invention relates to a method of exhaustins and sealing a vessel whose wall consists, at least partly,.of metal, for example, an electric discharge tube with a metal base.
  • the invention relates furthermore to vessels manufactured in accordance with this method.
  • the tube is exhausted through an opening in the metal portion, whereupon a metal obturating member, for example a plate are conical stopper, is introduced in the vacuum conduit into the opening in which it is hermetically fixed.
  • a metal obturating member for example a plate are conical stopper
  • This airtight fixation is obtained, for example, by heating some solder present on the obturating member or around the opening or at both points by means of an electric current and by thus meltin: it.
  • This method has the drawback that it requires a separate obturating member which has to be introduced into the vacuum conduit anew for every tube, the whole operation becoming thus rather complicated.
  • exhaustion takes place through an opening which is provided in the metal portion and whose wall consists of a fusible obturatingsubstance, for example tin-solder, which, subsequent to the exhaustion, is caused to melt and thus stops the said opening.
  • the obturating substance is melted by an electric current which is set up in a circuit which is closed-by pressing a movable metal body which is present in the vacuum conduit and which is connected to one of the terminals of a source of voltage, against a wall portion located in the neighbourhood of the exhaustion opening or against the fusible obturating substance itself.
  • the finding lug or exhaust tube may be provided at its end remote from the tube with a conical depression extending towards the tube,
  • the exhaustion opening is provided in this case in the vertex of this cone and this vertex itself can be easily filled-up with the obturating substance.
  • Fig. 1 shows in vertical section a metal tube, a metal finding lug associated with the tube, and apparatus for exhausting and sealing the tube;
  • Fig. 2 shows an enlarged vertical section of a conical space is produced, which is filled-up with a quantity 3 of obturating material, as is clearly shown in enlarged section in Fig. 2.
  • the obturating material may be for example tinsolder.
  • Into the material 3 there is drilled a small opening 2 through which the interior of the tube 9 part of which is formed by the finding lug, can be exhausted by means of exhaustion chamber 6. Subsequent to the exhaustion of the tube 9, the
  • portion 5 of a body 4 present in the vacuum conduit which portion consists, for example, of tungsten, is pressed against the bottom of the finding lug I, owing to which a circuit is closed whose terminals are connected to the finding lug I or the metal tube and to the body 1 respectively.
  • the resiliently mounted body 4 is raised by means of a core and magnet coil 8.
  • This source of current may be formed, for example, by a condenser charged to a high voltage. It is also possible to utilize another source of alternating or directcurrent voltage.
  • the heating current is supplied by means of lead-in wires at It and I l to fuse the solder 3. The solder is heated to such an extent that it melts, the
  • FIG. 2 shows the metal finding lug of the tube in enlarged cross section.
  • Numeral I again denotes the metal wall of the finding lug and the opening I, in the obturating material 3, is clearly shown.
  • a method of exhausting and sealing a vessel having a metal wall portion with an exhaust port therein comprising the steps of completely obstructing said port by fusing with the walls thereof a fusible metal, forming an exhaust opening communicating with said port in said fusible metal, exhausting said vessel through said opening, bringing into contact with said portion of said exhausted vessel at said opening a metal member, connecting a source of voltage to said member and to said portion and passing an electrical heating current through said portion to heat said fusible substance to the melting point thereof, closing said exhaust opening with the melted fusible substance, and cooling said melted fusible substance to its solid state to seal said exhausted vessel.
  • a method 01' exhausting and sealing a vessel having a metal wall portion with an exhaust port therein, and an electrically conducting fusible substance in and partially obstructing said port and having a lower melting point than the surrounding metal wall portion, comprising the steps of exhausting said vessel through the partially obstructed port, bringing into contact with said fusible substance an electric contact member, and passing an electric current through said contact member, said fusible substance, and aid metal wall portion, to heat said fusible substance to the melting point thereof, closing said partially obstructed port with the so melted fusible substance, and thereafter cooling said substance to its solid state to seal said exhausted vessel.
  • a method of exhausting and sealing a vessel having a metal wall portion with an exhaust port therein, and an electrically conducting fusible metal in and partially obstructing said port and having a lower melting point than the surrounding metal wall portion comprising the steps of exhausting said vessel through the partially obstructed port, bringing into contact with said fusible metal an electric contact member, and passing an electric current through said contact member, said fusible metal, and said metal wall portion, to heat said fusible metal to the melting point thereof, closing said partially obstructed port with the so melted fusible metal and thereafter cooling said metal to its solid state to seal said exhausted vessel.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Tubes (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Fuses (AREA)
US683084A 1943-08-18 1946-07-12 Vacuum tube seal Expired - Lifetime US2522062A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL243218X 1943-08-18

Publications (1)

Publication Number Publication Date
US2522062A true US2522062A (en) 1950-09-12

Family

ID=19780705

Family Applications (1)

Application Number Title Priority Date Filing Date
US683084A Expired - Lifetime US2522062A (en) 1943-08-18 1946-07-12 Vacuum tube seal

Country Status (7)

Country Link
US (1) US2522062A (en))
BE (1) BE457265A (en))
CH (1) CH243218A (en))
DE (1) DE839980C (en))
FR (1) FR906787A (en))
GB (1) GB634173A (en))
NL (1) NL59324C (en))

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2841690A (en) * 1954-12-28 1958-07-01 Gen Electric Contact pin and method for fluorescent lamps
US3123957A (en) * 1960-03-22 1964-03-10 Apparatus for processing a plurality of articles or materials
US3135889A (en) * 1962-05-22 1964-06-02 Jack A Soules Protected window x-ray tube
US3603661A (en) * 1965-01-21 1971-09-07 Gen Electric Vacuum seal
US4675987A (en) * 1983-03-12 1987-06-30 International Standard Electric Corporation Method of sealing a relay

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1820553A (en) * 1927-09-16 1931-08-25 Siemens Ag Device for cutting off vacuum vessels from the exhaust tubes of vacuum pumps
US2124428A (en) * 1934-09-13 1938-07-19 Gen Electric Metal vacuum tube
US2125316A (en) * 1936-02-04 1938-08-02 Bell Telephone Labor Inc Method of forming glass to metal seals
US2174682A (en) * 1937-10-30 1939-10-03 Gen Electric Tube base and socket
US2221868A (en) * 1938-09-23 1940-11-19 Gen Electric Glass-to-metal seal
US2269840A (en) * 1940-03-01 1942-01-13 Westinghouse Electric & Mfg Co Tipless exhaust

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1820553A (en) * 1927-09-16 1931-08-25 Siemens Ag Device for cutting off vacuum vessels from the exhaust tubes of vacuum pumps
US2124428A (en) * 1934-09-13 1938-07-19 Gen Electric Metal vacuum tube
US2125316A (en) * 1936-02-04 1938-08-02 Bell Telephone Labor Inc Method of forming glass to metal seals
US2174682A (en) * 1937-10-30 1939-10-03 Gen Electric Tube base and socket
US2221868A (en) * 1938-09-23 1940-11-19 Gen Electric Glass-to-metal seal
US2269840A (en) * 1940-03-01 1942-01-13 Westinghouse Electric & Mfg Co Tipless exhaust

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2841690A (en) * 1954-12-28 1958-07-01 Gen Electric Contact pin and method for fluorescent lamps
US3123957A (en) * 1960-03-22 1964-03-10 Apparatus for processing a plurality of articles or materials
US3135889A (en) * 1962-05-22 1964-06-02 Jack A Soules Protected window x-ray tube
US3603661A (en) * 1965-01-21 1971-09-07 Gen Electric Vacuum seal
US4675987A (en) * 1983-03-12 1987-06-30 International Standard Electric Corporation Method of sealing a relay

Also Published As

Publication number Publication date
CH243218A (de) 1946-06-30
NL59324C (en))
DE839980C (de) 1952-05-26
BE457265A (en))
FR906787A (fr) 1946-01-18
GB634173A (en) 1950-03-15

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