GB486884A - Improvements in and relating to the production of spiral filaments - Google Patents
Improvements in and relating to the production of spiral filamentsInfo
- Publication number
- GB486884A GB486884A GB3411736A GB3411736A GB486884A GB 486884 A GB486884 A GB 486884A GB 3411736 A GB3411736 A GB 3411736A GB 3411736 A GB3411736 A GB 3411736A GB 486884 A GB486884 A GB 486884A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coil
- mandrels
- seconds
- mandrel
- heated
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
In the manufacture of coiled-coil filaments for electric incandescent lamps, thermionic valves and the like, the primary coil is first wound upon a mandrel, and coil and mandrel are together wound closely upon a secondary mandrel, after which both mandrels are removed and the secondary coil is stretched between suitable clamps to separate its convolutions whilst it is heated to a temperature of 900 to 2200 DEG C. before being mounted in a lamp or the like. The primary coil may be heated to a temperature below 900 DEG C., for example, for 10 seconds in a reducing atmosphere at 850 DEG C. or for 30 seconds in air at 650 DEG C., before winding it into a secondary coil. The secondary coil may be similarly heated before the final heating, e.g. before the mandrels are removed. The final heating is carried out in an atmosphere of a reducing-gas such as a hydrogen-helium or hydrogen-nitrogen mixture, the duration of the heating being 30 seconds at a temperature of 1000 DEG C. or 5 seconds at 2000 DEG C. Mandrels of steel, molybdenum, brass, &c. may be used, both mandrels being removed in known manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3411736A GB486884A (en) | 1936-12-11 | 1936-12-11 | Improvements in and relating to the production of spiral filaments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3411736A GB486884A (en) | 1936-12-11 | 1936-12-11 | Improvements in and relating to the production of spiral filaments |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB486884A true GB486884A (en) | 1938-06-13 |
Family
ID=10361577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3411736A Expired GB486884A (en) | 1936-12-11 | 1936-12-11 | Improvements in and relating to the production of spiral filaments |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB486884A (en) |
-
1936
- 1936-12-11 GB GB3411736A patent/GB486884A/en not_active Expired
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