GB253350A - Improvements in automatic telephone systems - Google Patents
Improvements in automatic telephone systemsInfo
- Publication number
- GB253350A GB253350A GB1420925A GB1420925A GB253350A GB 253350 A GB253350 A GB 253350A GB 1420925 A GB1420925 A GB 1420925A GB 1420925 A GB1420925 A GB 1420925A GB 253350 A GB253350 A GB 253350A
- Authority
- GB
- United Kingdom
- Prior art keywords
- interrupters
- groups
- motors
- different
- driven
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
253,350. Standard Telephones & Cables, Ltd., (formerly Western Electric Co., Ltd.). and Nash, G. H. May 29, 1925. Automatic exchange systems.-Instead of driving all the interrupters in an office by a single motor, separate small induction or synchronous motors 15, 16 are provided for small groups of interrupters and are driven by single or polyphase currents of one or more frequencies supplied by a motor generator set 1, 3, the speed of which is kept constant by a governor and current for which is derived for example from the exchange battery. This allows groups of interrupters to be driven only when necessary. In cases where it is necessary for different groups to run at different speeds the motors may all be of one type while the generator supplies different frequencies from slip rings 11, 13, or a single frequency may be supplied, the motors of the different groups being differently wound.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE333678D BE333678A (en) | 1925-05-29 | ||
| GB1420925A GB253350A (en) | 1925-05-29 | 1925-05-29 | Improvements in automatic telephone systems |
| FR618081D FR618081A (en) | 1925-05-29 | 1926-06-24 | Improvements to automatic telephone systems |
| CH122198D CH122198A (en) | 1925-05-29 | 1926-09-02 | Drive device for interrupter units of telephone systems. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1420925A GB253350A (en) | 1925-05-29 | 1925-05-29 | Improvements in automatic telephone systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB253350A true GB253350A (en) | 1926-06-17 |
Family
ID=10037021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1420925A Expired GB253350A (en) | 1925-05-29 | 1925-05-29 | Improvements in automatic telephone systems |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE333678A (en) |
| CH (1) | CH122198A (en) |
| FR (1) | FR618081A (en) |
| GB (1) | GB253350A (en) |
-
0
- BE BE333678D patent/BE333678A/xx unknown
-
1925
- 1925-05-29 GB GB1420925A patent/GB253350A/en not_active Expired
-
1926
- 1926-06-24 FR FR618081D patent/FR618081A/en not_active Expired
- 1926-09-02 CH CH122198D patent/CH122198A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CH122198A (en) | 1927-10-01 |
| BE333678A (en) | |
| FR618081A (en) | 1927-03-02 |
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