GB481964A - Filaments for electric incandescent lamps and method of manufacturing the same - Google Patents
Filaments for electric incandescent lamps and method of manufacturing the sameInfo
- Publication number
- GB481964A GB481964A GB2266536A GB2266536A GB481964A GB 481964 A GB481964 A GB 481964A GB 2266536 A GB2266536 A GB 2266536A GB 2266536 A GB2266536 A GB 2266536A GB 481964 A GB481964 A GB 481964A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filament
- heating
- treatment
- less
- temperature
- 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
- H01K—ELECTRIC INCANDESCENT LAMPS
- H01K3/00—Apparatus or processes adapted to the manufacture, installing, removal, or maintenance of incandescent lamps or parts thereof
- H01K3/02—Manufacture of incandescent bodies
Abstract
In the manufacture of coiled filaments, suitable for use in electric incandescent lamps, from drawn tungsten wire inclined to the formation of long crystals, the coiled filament material is subjected for a period of not more than half a second to heat-treatment at a temperature which is below the melting point of tungsten but not less than 2800 DEG C. The filament before this treatment may be subjected on a mandrel to a heat-treatment at a temperature below the recrystallization temperature, but not less than 1000 DEG C., e.g. about 1100 DEG C. or with or without a preliminary heating to 600-900 DEG C. When the double heating is used, the second heating is carried out after the removal of the material from the mandrel. The short heating at high temperature is effected by passing through the material a sudden surge of current either by supplying the current through a transformer of poor regulation, or by discharging a condenser through the filament, either directly or through a series inductance. The filament has a sag, in use, of less than 5 per cent, and the wire has a fine-grained structure with a most probable crystal size of from one to ten thousandths of a millimetre. Specification 234,489*, [Class 39 (ii)], is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2266536A GB481964A (en) | 1936-08-17 | 1936-08-17 | Filaments for electric incandescent lamps and method of manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2266536A GB481964A (en) | 1936-08-17 | 1936-08-17 | Filaments for electric incandescent lamps and method of manufacturing the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB481964A true GB481964A (en) | 1938-03-17 |
Family
ID=10183108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2266536A Expired GB481964A (en) | 1936-08-17 | 1936-08-17 | Filaments for electric incandescent lamps and method of manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB481964A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4012659A (en) * | 1975-12-31 | 1977-03-15 | Gte Sylvania Incorporated | Method of flashing tungsten filament |
| US4020383A (en) * | 1975-12-31 | 1977-04-26 | Gte Sylvania Incorporated | Method of pulsing incandescent lamp filaments |
| EP0849770A2 (en) * | 1996-12-20 | 1998-06-24 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Manufacturing procedure of helicoidally wound coiled filaments and coiled filaments manufactured using said procedure |
-
1936
- 1936-08-17 GB GB2266536A patent/GB481964A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4012659A (en) * | 1975-12-31 | 1977-03-15 | Gte Sylvania Incorporated | Method of flashing tungsten filament |
| US4020383A (en) * | 1975-12-31 | 1977-04-26 | Gte Sylvania Incorporated | Method of pulsing incandescent lamp filaments |
| EP0849770A2 (en) * | 1996-12-20 | 1998-06-24 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Manufacturing procedure of helicoidally wound coiled filaments and coiled filaments manufactured using said procedure |
| EP0849770A3 (en) * | 1996-12-20 | 1999-06-09 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Manufacturing procedure of helicoidally wound coiled filaments and coiled filaments manufactured using said procedure |
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