GB441207A - Improvements in the manufacture of coiled coil filaments for electric incandescent lamps - Google Patents
Improvements in the manufacture of coiled coil filaments for electric incandescent lampsInfo
- Publication number
- GB441207A GB441207A GB21017/34A GB2101734A GB441207A GB 441207 A GB441207 A GB 441207A GB 21017/34 A GB21017/34 A GB 21017/34A GB 2101734 A GB2101734 A GB 2101734A GB 441207 A GB441207 A GB 441207A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oven
- temperature
- duration
- mandrel
- incandescent lamps
- 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)
- Resistance Heating (AREA)
- Wire Processing (AREA)
Abstract
In a method of manufacturing coiled coil filaments for electric incandescent lamps, tungsten wire, first wound on a primary mandrel, is then wound, together with its primary mandrel, on a continuous length of secondary mandrel, after which the secondary mandrel supporting the primary mandrel and the wire is drawn continuously through an oven which is maintained at a temperature so high that, if the wire were maintained at this temperature for one hour, it would re-crystallize completely, the duration of its stay in the oven, however, being so short that re-crystallization is not complete. An oven temperature between 1500 and 1600 DEG C. is generally suitable, and the duration of the heating between 5 and 60 seconds. In an example, the body is drawn through a molybdenum tube containing a hydrogen-nitrogen atmosphere and heated to a temperature of 1550 DEG C. by passing a current through it, the length of the oven and rate of drawing the body therethrough being such that the duration of heating is 12 seconds. The mandrels are then removed by solution in known manner.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB21017/34A GB441207A (en) | 1934-07-18 | 1934-07-18 | Improvements in the manufacture of coiled coil filaments for electric incandescent lamps |
| US29371A US2034540A (en) | 1934-07-18 | 1935-07-01 | Manufacture of coiled coil or double helical filaments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB21017/34A GB441207A (en) | 1934-07-18 | 1934-07-18 | Improvements in the manufacture of coiled coil filaments for electric incandescent lamps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB441207A true GB441207A (en) | 1936-01-15 |
Family
ID=10155779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB21017/34A Expired GB441207A (en) | 1934-07-18 | 1934-07-18 | Improvements in the manufacture of coiled coil filaments for electric incandescent lamps |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2034540A (en) |
| GB (1) | GB441207A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2000199A (en) * | 1977-06-20 | 1979-01-04 | Bulten Kanthal Ab | Annealing ovens |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3752040T2 (en) * | 1986-12-16 | 1997-10-30 | Gte Prod Corp | Compact double filament with use of the slope for bending control |
| DE3752039T2 (en) * | 1986-12-16 | 1997-10-30 | Gte Prod Corp | Compact double filament with holders |
| DE19653572A1 (en) * | 1996-12-20 | 1998-06-25 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Process for the production of helically wound helical bodies and helical bodies which are produced by this method |
-
1934
- 1934-07-18 GB GB21017/34A patent/GB441207A/en not_active Expired
-
1935
- 1935-07-01 US US29371A patent/US2034540A/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2000199A (en) * | 1977-06-20 | 1979-01-04 | Bulten Kanthal Ab | Annealing ovens |
| GB2000199B (en) * | 1977-06-20 | 1982-03-10 | Bulten Kanthal Ab | Improvements in or relating to annealing ovens |
Also Published As
| Publication number | Publication date |
|---|---|
| US2034540A (en) | 1936-03-17 |
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