GB269941A - Improvements in or relating to alarm circuit systems particularly fire alarm signalling systems - Google Patents
Improvements in or relating to alarm circuit systems particularly fire alarm signalling systemsInfo
- Publication number
- GB269941A GB269941A GB11059/27A GB1105927A GB269941A GB 269941 A GB269941 A GB 269941A GB 11059/27 A GB11059/27 A GB 11059/27A GB 1105927 A GB1105927 A GB 1105927A GB 269941 A GB269941 A GB 269941A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- station
- line
- central station
- calling
- 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
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/04—Telephonic communication systems specially adapted for combination with other electrical systems with alarm systems, e.g. fire, police or burglar alarm systems
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Alarm Systems (AREA)
Abstract
269,941. Snyders, G. C., Gordyn, C., Kamp, J. van de, and Maitland, C. E. A. April 26, 1926, [Convention date]. Fire, police, and like alarm systems.-The lines of a group of call stations are led to a distributing station at which they are extended by automatic ' switches, such as line-finders, to trunks leading to a central station, the number of trunks being preferably less than the number of call stations. Selectors at the central station, set by successive sets of impulses, select lamp circuits to indicate the number and location of the calling station. The progress of a call is indicated by additional lamps at the central station, and faults on the a and b lines from the call station to the distributing station are indicated by separate lamps. Connection of calling station AGSt 431 by line-finder AS at distributing station VSt 1 to trunk HBW to central station. Current normally flows through the relays A, Q, B, A being not energized owing to the resistance of Q. The initial operation of the substation calling apparatus closes contact IK, thereby short-circuiting relays B, Q and energizing relay A, which causes a slow-release relay A1 to prepare the circuit of a slow-release relay A2. On the initial opening of the impulse contact 4J, relay A energizes relay A2 which causes magnet D1 to rotate the line-finder until the calling line is reached, when a test circuit is closed over relays P2, P1, Sa, this circuit including a lead of the trunk to the central station. If the trunk is faulty, a fuse in the test circuit blows thus preventing the connection. Control of indicator at central station. Successive sets of impulses, corresponding to the number of the calling line, are repeated by the relay A over the trunks a, b in parallel to the impulse relay J at the central station. A slowrelease relay K1, under control of relay J, causes relays VI, V2, V3 to bring the magnets D3, H, D2 successively und'er the control of relay J. Magnet D3 sets the switch W1 to select the hundreds lamp H4, say, and magnets H, D2 operate a co-ordinate selector W2 to select tens and units lamps Z3, E1, say, and to light a lamp LL 431, say, individual to the calling station. The insertion of the plug AbA to set up telephonic communication with the calling station causes relay L to close the circuits of the selected hundreds, tens, and units lamps. The depression of the release key AT causes relay F to restore the selector W1 and relays VI, V2, V3, and to open the test circuit including relays P2, PI, Sa thereby energizing the release magnet M of the selector W2, and restoring the line-finder. Lamps L1 - - L4 at the central station indicate the progress of the call. Indicating faults on calling line. An earth on the b-line de-energizes relay B, thereby lighting lamp Lr. An earth on the a-line de-energizes relay B to light lamp Lr and also energizes relay A, which causes relay A1 to light lamp Lg. Relay A prevents the energization of relay A2 and therefore the operation of the line-finder. Lamp Lw indicates a call through to the central station.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE269941X | 1926-04-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB269941A true GB269941A (en) | 1928-07-25 |
Family
ID=5998026
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB11059/27A Expired GB269941A (en) | 1926-04-26 | 1927-04-25 | Improvements in or relating to alarm circuit systems particularly fire alarm signalling systems |
Country Status (4)
Country | Link |
---|---|
US (1) | US1740123A (en) |
FR (1) | FR633287A (en) |
GB (1) | GB269941A (en) |
NL (1) | NL24801C (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2820098A (en) * | 1952-03-19 | 1958-01-14 | Skogsberg Erik Lennart | Signaling system |
-
0
- NL NL24801D patent/NL24801C/xx active
-
1927
- 1927-04-25 GB GB11059/27A patent/GB269941A/en not_active Expired
- 1927-04-25 FR FR633287D patent/FR633287A/en not_active Expired
- 1927-10-19 US US227150A patent/US1740123A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
FR633287A (en) | 1928-01-26 |
NL24801C (en) | |
US1740123A (en) | 1929-12-17 |
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