US3816087A - Method of interconnecting glass parts by passing through electric current - Google Patents

Method of interconnecting glass parts by passing through electric current Download PDF

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Publication number
US3816087A
US3816087A US00188614A US18861471A US3816087A US 3816087 A US3816087 A US 3816087A US 00188614 A US00188614 A US 00188614A US 18861471 A US18861471 A US 18861471A US 3816087 A US3816087 A US 3816087A
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US
United States
Prior art keywords
edges
glass
electric current
passing
glass parts
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
US00188614A
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English (en)
Inventor
Duuren K Van
A Verhoeven
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.)
US Philips Corp
Original Assignee
US Philips Corp
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 NL6902027A priority Critical patent/NL6902027A/xx
Priority to DE19702004338 priority patent/DE2004338C3/de
Priority to GB5513/70A priority patent/GB1241525A/en
Priority to FR7004258A priority patent/FR2030382B1/fr
Application filed by US Philips Corp filed Critical US Philips Corp
Priority to US00188614A priority patent/US3816087A/en
Application granted granted Critical
Publication of US3816087A publication Critical patent/US3816087A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/20—Uniting glass pieces by fusing without substantial reshaping
    • C03B23/207—Uniting glass rods, glass tubes, or hollow glassware
    • C03B23/217—Uniting glass rods, glass tubes, or hollow glassware for the production of cathode ray tubes or similarly shaped tubes
    • 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
    • H01J5/20—Seals between parts of vessels
    • H01J5/22—Vacuum-tight joints between parts of vessel
    • H01J5/24—Vacuum-tight joints between parts of vessel between insulating parts of vessel
    • 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
    • H01J2893/0037—Solid sealing members other than lamp bases
    • H01J2893/0038—Direct connection between two insulating elements, in particular via glass material
    • H01J2893/0039—Glass-to-glass connection, e.g. by soldering

Definitions

  • the invention relates to a method of interconnecting glass parts by fusing their edges together, in which the joined, preheated edges are heated and caused to fuse together by the passage of electric current with the aid of current supply points arranged along the outer circumference.
  • British Pat. specification No. 985,422 proposes to surround the gas flame conveying the electric current by flow of nonionized gas, for example, cold air, However, this method is complicated.
  • FIG. 1 is a schematic cross sectional view and H6.
  • 2 is a schematic longitudinal sectional view of an assembly for interconnecting glass parts of the bulb of an electron tube.
  • reference numeral 1 designates the glass cone of an electron tube, to which a flat glass window 2 has to be sealed.
  • the cone 1 is clamped in a holder and the glass plate 2 in a holder 111, which holders can be caused to rotate.
  • a rare gas in this case argon is supplied to the copper tubes 5 by means of the hoses 6 of insulating material, while an alternating voltage is applied to the tubes 5 by means of the conductors 9.
  • the tubes 5 are adjusted previously by means of the clamping connection 8 so that their mouthpieces are at a distance of about 0.5 to 2 cm from the glass edges of the bulb parts 1 and 2 to be sealed.
  • the argon stream is sufficiently conductive in the cold state for conveying the electric current to the pre-heated glass edges.
  • the argon gas is rapidly heated so that an arc 12 is struck as in the case of the current supply via a gas flame in the known methods.
  • the bulb 1 has a wall thickness of 2 mm
  • the window 2 has a thickness of 4 mm.
  • the alternating voltage is initially about 7,000 V.cm with an arc length of about 0.5 cm on either side of the window 2 and after heating of the argon stream and the glass it drops to about 1,500 V. These values correspond approximately with those involved in the use of a gas flame for current supply.
  • the argon stream has in this case a sectional area of 1 mm, whilst about 2 litres of argon are consumed per minute at each supply point.
  • the current strength through the arcsand the glass edges is initially 8 Amp. but it is afterwards raised to about 14 Amp. at which the glass becomes thin liquid.
  • the electric current as well as the supply of argon are interrupted in order to avoid that a cold stream of argon strikes the hot weld, after which the weld is after-heated in a conventional manner by means of the burners 3 and 4 and is subsequently cooled slowly.
  • the holder 11, in which the window plate 2 is held, for example, by subatmospheric pressure, can be moved up and down in a conventional manner so that during the preheating process the glass edges of the parts 1 and 2 can be held at a given distance from each other and heating of the outer and inner sides is more uniform. For sealing the edges together, they are simply brought into contact with each other.
  • the invention is suitable both for sealing together thick glass wall parts, for example, the window and the cone of television display tubes and for interconnecting thin-walled parts, for example, the neck and the cone of such a display tube.
  • the length of the arc and the current strength are, of course, adapted to the thickness of the glass as well as the diameter and the rate of flow of the argon if necessary.
  • argon is found to provide the best results.
  • three or more supply points may be used in a conventional manner, in which case threeor multi-phase alternating current is used. If desired, the glass parts may be sealed together whilst they are standing still with respect to the current supply points,
  • the ignition voltage and the arc voltage may be reduced by producing an auxiliary discharge in the gas supply duct or closely in front of the gas outlet aperture so that the gas stream is pre-ionized.
  • A- method of interconnecting glass parts by sealing their edges to each other comprising the steps of:

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Joining Of Glass To Other Materials (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
US00188614A 1969-02-08 1971-10-12 Method of interconnecting glass parts by passing through electric current Expired - Lifetime US3816087A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL6902027A NL6902027A (en:Method) 1969-02-08 1969-02-08
DE19702004338 DE2004338C3 (de) 1969-02-08 1970-01-30 Verfahren zum Verbinden von Glasteilen durch Durchführung eines elektrischen Stromes
GB5513/70A GB1241525A (en) 1969-02-08 1970-02-05 Methods of sealing glass parts
FR7004258A FR2030382B1 (en:Method) 1969-02-08 1970-02-06
US00188614A US3816087A (en) 1969-02-08 1971-10-12 Method of interconnecting glass parts by passing through electric current

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NL6902027A NL6902027A (en:Method) 1969-02-08 1969-02-08
US832570A 1970-02-03 1970-02-03
US00188614A US3816087A (en) 1969-02-08 1971-10-12 Method of interconnecting glass parts by passing through electric current

Publications (1)

Publication Number Publication Date
US3816087A true US3816087A (en) 1974-06-11

Family

ID=27351485

Family Applications (1)

Application Number Title Priority Date Filing Date
US00188614A Expired - Lifetime US3816087A (en) 1969-02-08 1971-10-12 Method of interconnecting glass parts by passing through electric current

Country Status (4)

Country Link
US (1) US3816087A (en:Method)
FR (1) FR2030382B1 (en:Method)
GB (1) GB1241525A (en:Method)
NL (1) NL6902027A (en:Method)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4118618A (en) * 1976-04-14 1978-10-03 Les Cables De Lyon Device for welding optical fibres end to end
US4691090A (en) * 1980-06-27 1987-09-01 Npk Za Kontrolno Zavarachni Raboti Method and device for plasma cutting of non-metallic materials
US5322542A (en) * 1991-11-22 1994-06-21 Toyo Glass Company Limited Method of and apparatus for chamfering edge of glass vessel
CN110254839A (zh) * 2019-06-05 2019-09-20 杭州电子科技大学 一种试剂管自动旋转热封装置及其热封方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2306054A (en) * 1938-02-19 1942-12-22 Corning Glass Works Glass heating and working
US2858411A (en) * 1955-10-11 1958-10-28 Union Carbide Corp Arc torch and process

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2306054A (en) * 1938-02-19 1942-12-22 Corning Glass Works Glass heating and working
US2858411A (en) * 1955-10-11 1958-10-28 Union Carbide Corp Arc torch and process

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4118618A (en) * 1976-04-14 1978-10-03 Les Cables De Lyon Device for welding optical fibres end to end
US4691090A (en) * 1980-06-27 1987-09-01 Npk Za Kontrolno Zavarachni Raboti Method and device for plasma cutting of non-metallic materials
US5322542A (en) * 1991-11-22 1994-06-21 Toyo Glass Company Limited Method of and apparatus for chamfering edge of glass vessel
CN110254839A (zh) * 2019-06-05 2019-09-20 杭州电子科技大学 一种试剂管自动旋转热封装置及其热封方法
CN110254839B (zh) * 2019-06-05 2021-04-20 杭州电子科技大学 一种试剂管自动旋转热封装置及其热封方法

Also Published As

Publication number Publication date
DE2004338A1 (de) 1970-09-03
GB1241525A (en) 1971-08-04
FR2030382B1 (en:Method) 1974-03-15
DE2004338B2 (de) 1976-04-22
FR2030382A1 (en:Method) 1970-11-13
NL6902027A (en:Method) 1970-08-11

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