GB521917A - Improvements in and relating to vitreous stems for electric lamps or discharge devices - Google Patents

Improvements in and relating to vitreous stems for electric lamps or discharge devices

Info

Publication number
GB521917A
GB521917A GB34596/38A GB3459638A GB521917A GB 521917 A GB521917 A GB 521917A GB 34596/38 A GB34596/38 A GB 34596/38A GB 3459638 A GB3459638 A GB 3459638A GB 521917 A GB521917 A GB 521917A
Authority
GB
United Kingdom
Prior art keywords
tube
stem
wires
exhaust tube
leading
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
GB34596/38A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co Ltd
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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB521917A publication Critical patent/GB521917A/en
Expired legal-status Critical Current

Links

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
    • H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
    • H01J9/32—Sealing leading-in conductors
    • H01J9/323—Sealing leading-in conductors into a discharge lamp or a gas-filled discharge device

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

521,917. Sealing leading-in wires. BRITISH THOMSON-HOUSTON CO., Ltd. Nov. 28, 1938, No. 34596. Convention date, Nov. 27, 1937. [Class 36] A short stem for an electric lamp or discharge device is formed by arranging a flared stem tube 10, leading-in wires 18 and exhaust tube 13 as shown in Fig. 1 and then heating the upper end of the stem tube to cause it to flow freely downward and form a solid mass of glass enclosing portions of the leading-in wires and closing the top of the exhaust tube, as shown in Fig. 2. Compressed air or gas is then admitted to the exhaust tube to blow an axial aperture 23, Fig; 4, through the mass of glass at its upper end. Air is also preferably blown into the space between the exhaust tube and the stem tube to round the joint therebetween. The thin glass coatings 31, Fig. 4, adhering to the leading-in wires are preferably removed to provide clean parts of the wires to which the filament may be attached. The skirt 12 of the stem tube may be attached to the main portion of the envelope of the lamp of discharge device by the method described in Specification 521,918, [Group XL]. In forming the stem the stem tube 10 is supported by a body 11 capable of rotation about a vertical axis and carrying a tube 17 which surrounds the exhaust tube, the tube 17 carrying a threaded ring 20 which supports the leading-in wires. Air for blowing out end of the exhaust tube is supplied through a nozzle 14 which also supplies air to the space'.between the stem tube and exhaust tube through holes 24 and the space between the exhaust tube and its surrounding tube 17,
GB34596/38A 1937-11-27 1938-11-28 Improvements in and relating to vitreous stems for electric lamps or discharge devices Expired GB521917A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US176909A US2128173A (en) 1937-11-27 1937-11-27 Method of making stems for sealed electrical devices

Publications (1)

Publication Number Publication Date
GB521917A true GB521917A (en) 1940-06-04

Family

ID=22646394

Family Applications (1)

Application Number Title Priority Date Filing Date
GB34596/38A Expired GB521917A (en) 1937-11-27 1938-11-28 Improvements in and relating to vitreous stems for electric lamps or discharge devices

Country Status (2)

Country Link
US (1) US2128173A (en)
GB (1) GB521917A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2438562A (en) * 1942-03-13 1948-03-30 Gen Electric Seal for electric discharge devices and method of manufacture
US2434478A (en) * 1943-12-22 1948-01-13 Westinghouse Electric Corp Incandescent electric lamp and method
US3529335A (en) * 1966-05-06 1970-09-22 Pinlites Inc Method of making a light bulb with a plurality of independently connected filaments for indicating graphic symbols
FR2616962B1 (en) * 1987-06-17 1990-04-27 Dumas Pierre FLUORESCENT BULB WITH EDISON TUBULAR FOOT

Also Published As

Publication number Publication date
US2128173A (en) 1938-08-23

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