GB1006929A - Improvements relating to glass-to-metal seals - Google Patents
Improvements relating to glass-to-metal sealsInfo
- Publication number
- GB1006929A GB1006929A GB456061A GB456061A GB1006929A GB 1006929 A GB1006929 A GB 1006929A GB 456061 A GB456061 A GB 456061A GB 456061 A GB456061 A GB 456061A GB 1006929 A GB1006929 A GB 1006929A
- Authority
- GB
- United Kingdom
- Prior art keywords
- glass
- seal
- members
- inner member
- outer member
- 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
- H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
- H01J5/32—Seals for leading-in conductors
- H01J5/40—End-disc seals, e.g. flat header
- H01J5/42—End-disc seals, e.g. flat header using intermediate part
-
- 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
- H01J2893/0034—Lamp bases
Landscapes
- Joining Of Glass To Other Materials (AREA)
Abstract
<PICT:1006929/C1/1> <PICT:1006929/C1/2> A "glass to metal" seal includes a massive (defined) inner member, e.g. rod or tube and a massive outer member encircling the inner member and possessing a higher coefficient of expansion than that of the glass forming the hermetic seal between the two members and located substantially wholly within the axial length of the outer member, wherein the electrical creep path between the two members is increased by extending the glass forming the seal to cover an outwardly flared internal surface of the outer member. In Fig. 2 the outer annular member 2 is sealed from the coaxial inner member 1 by means of glass 3 having an extended coating 4 over the inner surface of member 2. It is stated that by this means tenstile stress in regions 4 and 5 is mainly avoided. Where the glass seal is exposed to sub-atmospheric pressure it is preferable to shape the side of the seal having no adjoining extension with an annular concavity 7, which may be formed by a removable graphite mould 8. Fig. 3 shows an outer annular member shaped with tapered inner surfaces 9, 10. The sealing glass has extended portion 4 which is maintained in compression by shoulders 11. The radial thickness of the outer member and in some cases the inner member is greater in the seal area. The metal members may be of mild steel and the glass, the composition disclosed in Specification 582,353. At the seal area the inner member may be made of the alloy described in Specification 642,668 with coefficient of expansion matching the glass seal and the outer member of low carbon steel. The metal members may be enamelled before sealing and the seal, (for concavities up to 30 degrees from the flat) may be made using flat faced graphite moulds.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB456061A GB1006929A (en) | 1961-02-07 | 1961-02-07 | Improvements relating to glass-to-metal seals |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB456061A GB1006929A (en) | 1961-02-07 | 1961-02-07 | Improvements relating to glass-to-metal seals |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1006929A true GB1006929A (en) | 1965-10-06 |
Family
ID=9779457
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB456061A Expired GB1006929A (en) | 1961-02-07 | 1961-02-07 | Improvements relating to glass-to-metal seals |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1006929A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4029897A (en) * | 1975-08-07 | 1977-06-14 | Quality Hermetics Limited | Glass seal |
US4065636A (en) * | 1974-03-25 | 1977-12-27 | Corning Glass Works | Hermetic enclosure for electronic component |
FR2491218A1 (en) * | 1980-09-30 | 1982-04-02 | Bicron Corp | SCINTILLATION DETECTOR MOUNTED IN A HERMETIC HOUSING |
GB2124822A (en) * | 1982-07-21 | 1984-02-22 | Heimann Gmbh | Gas discharge lamp |
US4461925A (en) * | 1981-08-31 | 1984-07-24 | Emerson Electric Co. | Hermetic refrigeration terminal |
US4507522A (en) * | 1981-07-16 | 1985-03-26 | Kyle James C | Terminal assembly |
FR2646278A1 (en) * | 1989-04-20 | 1990-10-26 | Electrovac | PRESS GLASS PASSAGE |
-
1961
- 1961-02-07 GB GB456061A patent/GB1006929A/en not_active Expired
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4065636A (en) * | 1974-03-25 | 1977-12-27 | Corning Glass Works | Hermetic enclosure for electronic component |
US4029897A (en) * | 1975-08-07 | 1977-06-14 | Quality Hermetics Limited | Glass seal |
FR2491218A1 (en) * | 1980-09-30 | 1982-04-02 | Bicron Corp | SCINTILLATION DETECTOR MOUNTED IN A HERMETIC HOUSING |
US4507522A (en) * | 1981-07-16 | 1985-03-26 | Kyle James C | Terminal assembly |
US4461925A (en) * | 1981-08-31 | 1984-07-24 | Emerson Electric Co. | Hermetic refrigeration terminal |
GB2124822A (en) * | 1982-07-21 | 1984-02-22 | Heimann Gmbh | Gas discharge lamp |
FR2646278A1 (en) * | 1989-04-20 | 1990-10-26 | Electrovac | PRESS GLASS PASSAGE |
GB2232541A (en) * | 1989-04-20 | 1990-12-12 | Electrovac | Pressurized-glass bushing |
GB2232541B (en) * | 1989-04-20 | 1993-09-15 | Electrovac | Pressurized-glass bushing |
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