GB403508A - Improvements in or relating to telephone systems - Google Patents
Improvements in or relating to telephone systemsInfo
- Publication number
- GB403508A GB403508A GB2983632A GB2983632A GB403508A GB 403508 A GB403508 A GB 403508A GB 2983632 A GB2983632 A GB 2983632A GB 2983632 A GB2983632 A GB 2983632A GB 403508 A GB403508 A GB 403508A
- Authority
- GB
- United Kingdom
- Prior art keywords
- current
- motor
- exchange
- junction
- relay
- 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
- H04M19/06—Current supply arrangements for telephone systems in which current supply sources at subordinate switching centres are charged from the main exchange
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Control Of Eletrric Generators (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Control Of Charge By Means Of Generators (AREA)
Abstract
403,508. Automatic exchange systems. GENERAL ELECTRIC CO., Ltd., Magnet House, Kingsway, London, and PUCKETTE, C. C., c/o General Electric Co., Stoke, Coventry. Oct. 25, 1932, No. 29836. [Class 40 (iv).] In an arrangement in which current is supplied to a sub-exchange over a junction from the main exchange either normally or in exceptional circumstances, the comparatively heavy current necessary for driving switches is obtained by the use of a motor connected to the junction and provided with a flywheel or other energy-storing device so as to act for short periods as a generator. The motor is preferably of a high-speed permanent-magnet type having a low resistance armature. In Fig. 1, current is received over the junction 4, 5 or over a single wire with an earth return. The switches are connected to leads 2, while the various relays are connected to leads 3. As long as the sub-exchange is in use, relay X is operative and connects current to the motor M, which by virtue of the stored energy in its flywheel acts as a generator when the switches draw current from leads 2 and maintains the voltage for a sufficient time for their operation. Alternatively, the motor M may be started only when impulsing is about to take place. In Fig. 2, the current is normally obtained from the local A.C. supply 12, relay Y being operated thereby. Upon failure of the supply however, relay Y falls back and current is received over the last-choice junction 6, 7, which is marked busy at both ends, and lamp AL is lighted at the main exchange. The motor M is started, and acts as a generator when comparatively heavy current is required as in Fig. 1. If desired, the current from the main exchange may be received over several junctions in parallel. The arrangement may be employed to supplement a local battery in the event of failure of the charging plant or excessive discharge of the battery. Specification 388,935 is referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2983632A GB403508A (en) | 1932-10-25 | 1932-10-25 | Improvements in or relating to telephone systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2983632A GB403508A (en) | 1932-10-25 | 1932-10-25 | Improvements in or relating to telephone systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB403508A true GB403508A (en) | 1933-12-28 |
Family
ID=10297972
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2983632A Expired GB403508A (en) | 1932-10-25 | 1932-10-25 | Improvements in or relating to telephone systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB403508A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3048660A (en) * | 1958-07-31 | 1962-08-07 | Bell Telephone Labor Inc | Telephone pay station system |
US3097266A (en) * | 1958-05-23 | 1963-07-09 | Sodeco Compteurs De Geneve | Telephone fee counter |
US4931367A (en) * | 1988-10-28 | 1990-06-05 | C & D Charter Power Systems, Inc. | Low float technology battery |
-
1932
- 1932-10-25 GB GB2983632A patent/GB403508A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3097266A (en) * | 1958-05-23 | 1963-07-09 | Sodeco Compteurs De Geneve | Telephone fee counter |
US3048660A (en) * | 1958-07-31 | 1962-08-07 | Bell Telephone Labor Inc | Telephone pay station system |
US4931367A (en) * | 1988-10-28 | 1990-06-05 | C & D Charter Power Systems, Inc. | Low float technology battery |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB403508A (en) | Improvements in or relating to telephone systems | |
US1882473A (en) | Emergency lighting system | |
US1704996A (en) | Automatic generating plant | |
GB603129A (en) | Improvements in and relating to electromagnets | |
US1707296A (en) | Multiple-unit generator system | |
GB494064A (en) | Electric generating plant | |
US1422027A (en) | Automatic electric generating unit | |
GB542011A (en) | Improvements in or relating to telephone systems | |
GB371538A (en) | Improvements relating to electric current generating systems | |
US2930900A (en) | Engine starting circuit | |
GB113479A (en) | Automatic Control of Electric Generating Sets for Emergency or Stand-by Purposes for Ships, Public Buildings and for other purposes. | |
US1332707A (en) | William w | |
US1142791A (en) | Electrical equipment for internal-combustion engines. | |
GB179601A (en) | Improvements in or relating to switching arrangements for secondary battery systems | |
GB399888A (en) | Improvements in and relating to direct current generators | |
GB494653A (en) | Improvements in and relating to power systems for self-propelled vehicles | |
GB719008A (en) | Improvements in engine driven generating plants | |
GB435181A (en) | Improvements in or relating to protective arrangements for electric power plant | |
US871826A (en) | Electric train-lighting system. | |
GB463740A (en) | Improvements relating to apparatus for charging electric storage batteries | |
DE640242C (en) | Circuit arrangement for supplying electrical systems by means of motor generators, in particular for telephone systems | |
GB555523A (en) | Bridge-stabilised oscillators for voice frequency circuits | |
CN109347381A (en) | A kind of multimode failure reset processing unit for aviation low pressure dc generator controller | |
GB541826A (en) | Improvements in the control of electric motors | |
GB474653A (en) | Improvements in or relating to telephone systems |