GB607843A - Improvements in the manufacture of vitreous stems for tubular electric lamps - Google Patents
Improvements in the manufacture of vitreous stems for tubular electric lampsInfo
- Publication number
- GB607843A GB607843A GB443346A GB443346A GB607843A GB 607843 A GB607843 A GB 607843A GB 443346 A GB443346 A GB 443346A GB 443346 A GB443346 A GB 443346A GB 607843 A GB607843 A GB 607843A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tube
- glass
- exhausting
- stem
- wires
- 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
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)
- Glass Compositions (AREA)
Abstract
607,843. Metal-to-glass seals. COLE, Ltd., E. K., and HAEGELE, F. G. A. Feb. 13, 1946, No. 4433. [Class 36] In making short vitreous stems of the squat frustro-conical type for use in tubular electric lamps, the formation of the stem and sealing of the leading-in wires between the stem tube and exhausting tube is effected by the application of a mould about the softened neck of the stem tube and the application of a gas under pressure to the inside of the exhausting tube and/or between the tubes to form a seal of the shape of the mould. The exhausting tube, and the space between that tube and the stem tube, are preferably subjected to slight suction immediately before the admission of the pressure gas. A stem tube 1 with an integral flare 3 is placed on a support 2 shaped to the flare, and a glass exhausting-tube 6, which may be closed at its upper end, is placed within a central support provided with an axial passage 9 and a lateral tube 8, the former being in communication with the interior of the tube 6 while the latter communicates with the inside of the tube 1 via the space 12 between the tube 6 and the inside wall of the support therefor. A pair of lead-in wires 4 is located between the stem tube 1 and the support for the exhausting-tube. The tube 1 is heated by flames directed thereon and softens and collapses on to the lead-in wires and exhausting- tube, whereupon a slight suction is applied to the tubes 8, 9, the suction at 8 being greater than that at 9 so that the glass is drawn downwardly towards the flare 3 and covers and seals the wires without distorting the glass below the seal. A two-part mould 13, Fig. 2, is next brought to enclose the still plastic glass, and air or gas under pressure is blown through the tubes 8, 9, thereby opening the upper end of the exhaust tube and blowing the glass evenly to the shape of the mould. The mould may be provided with recesses 14 disposed adjacent to the wires so that supporting beads or nodules of glass are formed at the upper junctions between the wire and glass. The operations may be performed automatically in a turret machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB443346A GB607843A (en) | 1946-02-13 | 1946-02-13 | Improvements in the manufacture of vitreous stems for tubular electric lamps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB443346A GB607843A (en) | 1946-02-13 | 1946-02-13 | Improvements in the manufacture of vitreous stems for tubular electric lamps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB607843A true GB607843A (en) | 1948-09-06 |
Family
ID=9777082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB443346A Expired GB607843A (en) | 1946-02-13 | 1946-02-13 | Improvements in the manufacture of vitreous stems for tubular electric lamps |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB607843A (en) |
-
1946
- 1946-02-13 GB GB443346A patent/GB607843A/en not_active Expired
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