GB642521A - Improvements in and relating to coiled filaments for electric lamps and discharge devices and methods of making the same - Google Patents
Improvements in and relating to coiled filaments for electric lamps and discharge devices and methods of making the sameInfo
- Publication number
- GB642521A GB642521A GB21166/44A GB2116644A GB642521A GB 642521 A GB642521 A GB 642521A GB 21166/44 A GB21166/44 A GB 21166/44A GB 2116644 A GB2116644 A GB 2116644A GB 642521 A GB642521 A GB 642521A
- Authority
- GB
- United Kingdom
- Prior art keywords
- convolutions
- coil
- main coil
- wire
- same
- 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
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/04—Electrodes; Screens; Shields
- H01J61/06—Main electrodes
- H01J61/067—Main electrodes for low-pressure discharge lamps
- H01J61/0672—Main electrodes for low-pressure discharge lamps characterised by the construction of the electrode
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Discharge Lamp (AREA)
- Resistance Heating (AREA)
- Wire Processing (AREA)
Abstract
642,521. Electric incandescent lamp filaments. BRITISH THOMSON-HOUSTON CO., Ltd. Oct. 30, 1944, No. 21166. Convention date, Oct. 30, 1943. [Class 39(ii)] [Also in Group XL(a)] A coiled filament for an electric lamp comprises a main coil of thick wire and a second coil of finer wire, connected in shunt with the main coil and having convolutions. of a diameter which is essentially the same as that of the convolutions of the main coil, positioned substantially coaxially with the convolutions of the main coil so as to cross them and intervene between them. The filament is made by winding- on a mandrel M, Fig. 2, a wire 11 of elastic material to form the main coil, winding under tension a finer wire 13 (Fig. 7, not shown) to form the second coil having convolutions which cross at 15 the convolutions of the main coil and which contact the mandrel between the said convolutions, heat-treating the wires, cutting the assembly to the individual filament lengths, and chemically disintegrating the mandrel. Two finer wires can be wound side by side over and between the coils of the main wire. One or more additional windings may be wound over the main coil and the second coil. The two coils can be wound in opposite helical senses with the same or different pitches or in the same helical sense with different pitches.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US642521XA | 1943-10-30 | 1943-10-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB642521A true GB642521A (en) | 1950-09-06 |
Family
ID=22054621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB21166/44A Expired GB642521A (en) | 1943-10-30 | 1944-10-30 | Improvements in and relating to coiled filaments for electric lamps and discharge devices and methods of making the same |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2371205A (en) |
| FR (1) | FR938083A (en) |
| GB (1) | GB642521A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1231809B (en) * | 1962-02-13 | 1967-01-05 | Patra Patent Treuhand | Spiral electrode for low-pressure discharge lamps |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2479192A (en) * | 1946-06-28 | 1949-08-16 | Gen Electric | Cathode |
| US2479193A (en) * | 1946-07-08 | 1949-08-16 | Gen Electric | Articulated cathode |
| BE488975A (en) * | 1948-05-14 | |||
| US2723926A (en) * | 1952-10-30 | 1955-11-15 | Westinghouse Electric Corp | Method of winding a tungsten coil on an iron mandrel |
| US2966726A (en) * | 1955-09-06 | 1961-01-03 | Radiation Inc | Stylus assembly method |
| US3210589A (en) * | 1960-04-28 | 1965-10-05 | Westinghouse Electric Corp | Electric incandescent lamp having filament of partially recrystallized fibrous structure |
| 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 |
| 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 |
-
0
- US US2371205D patent/US2371205A/en not_active Expired - Lifetime
-
1944
- 1944-10-30 GB GB21166/44A patent/GB642521A/en not_active Expired
-
1946
- 1946-12-31 FR FR938083D patent/FR938083A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1231809B (en) * | 1962-02-13 | 1967-01-05 | Patra Patent Treuhand | Spiral electrode for low-pressure discharge lamps |
Also Published As
| Publication number | Publication date |
|---|---|
| US2371205A (en) | 1945-03-13 |
| FR938083A (en) | 1948-09-03 |
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