GB745910A - Improvements in or relating to the manufacture of electrical devices having gas-filled sealed envelopes - Google Patents

Improvements in or relating to the manufacture of electrical devices having gas-filled sealed envelopes

Info

Publication number
GB745910A
GB745910A GB2972052A GB2972052A GB745910A GB 745910 A GB745910 A GB 745910A GB 2972052 A GB2972052 A GB 2972052A GB 2972052 A GB2972052 A GB 2972052A GB 745910 A GB745910 A GB 745910A
Authority
GB
United Kingdom
Prior art keywords
gas
filled
glass
devices
metal
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
Application number
GB2972052A
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 PLC
Original Assignee
General Electric Co 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
Application filed by General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB2972052A priority Critical patent/GB745910A/en
Publication of GB745910A publication Critical patent/GB745910A/en
Expired legal-status Critical Current

Links

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
    • H01J5/20—Seals between parts of vessels
    • H01J5/22—Vacuum-tight joints between parts of vessel
    • H01J5/26—Vacuum-tight joints between parts of vessel between insulating and conductive 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
    • H01J2893/0041—Direct connection between insulating and metal elements, in particular via glass material
    • H01J2893/0043—Glass-to-metal or quartz-to-metal, e.g. by soldering

Landscapes

  • Resistance Heating (AREA)

Abstract

745,910. Glass-metal seals; fusibic cut-outs. GENERAL ELECTRIC CO., Ltd., BREADNER, R. L., NEILL, T. R., and SIMMS, C. H. Nov. 17, 1953 [Nov. 24, 1952], No. 29720/52. Classes 36 and 38 (1). [Also in Groups XI and XL (a)] A method of manufacturing electrical devices, such as discharge devices, voltage break-down devices, T-R cells, resistors, incandescent lamps and fuses, having a sealed envelope whose interior is filled with gas to a required pressure, in which the envelope is constructed in the form of a number of alternate glass and metal parts which are loosely assembled within an enclosure with each metal part abutting against each adjacent glass part, the enclosure is gas-filled to a suitable pressure, and each metal part is heated by an eddy current so as to soften each adjacent glass part and seal itself thereto hermetically, the suitable pressure of gas being such that the gas trapped within the envelope by the sealing constitutes a filling at the required pressure when the device has cooled down to room temperature. The method can be applied by the apparatus shown in Fig. 4 comprising two hard glass parts 12 and 13 fitted together in vacuum-tight manner by ground and greased flanges 14 and 15 and containing the loosely-assembled electrical devices 1 supported on a ceramic platform 20 supported by tungsten wires 16, 17. The apparatus has a stem 21 communicating with a vacuum pump or a source of filling gas (argon and nitrogen are referred to) and is surrounded by an eddy current heating coil 22 at the level of the platform 20. The apparatus is exhausted to a pressure of less than 10-<SP>4</SP> mms. of mercury before being filled with the requisite gas, and the coil 22 is then operated. The devices can be degassed before sealing by a baking treatment for the apparatus whilst evacuated. Fig. 3 shows a fuse comprising a glass tube 8 closed at each end by a metal cap 9, 10 and containing a wire filament 11 welded or otherwise attached at each end to one of the end caps, and filled with nitrogen. Specification 715,685, [Group XL (a)], is referred to.
GB2972052A 1952-11-24 1952-11-24 Improvements in or relating to the manufacture of electrical devices having gas-filled sealed envelopes Expired GB745910A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2972052A GB745910A (en) 1952-11-24 1952-11-24 Improvements in or relating to the manufacture of electrical devices having gas-filled sealed envelopes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2972052A GB745910A (en) 1952-11-24 1952-11-24 Improvements in or relating to the manufacture of electrical devices having gas-filled sealed envelopes

Publications (1)

Publication Number Publication Date
GB745910A true GB745910A (en) 1956-03-07

Family

ID=10296049

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2972052A Expired GB745910A (en) 1952-11-24 1952-11-24 Improvements in or relating to the manufacture of electrical devices having gas-filled sealed envelopes

Country Status (1)

Country Link
GB (1) GB745910A (en)

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