GB1484965A - Alarm systems - Google Patents

Alarm systems

Info

Publication number
GB1484965A
GB1484965A GB4208275A GB4208275A GB1484965A GB 1484965 A GB1484965 A GB 1484965A GB 4208275 A GB4208275 A GB 4208275A GB 4208275 A GB4208275 A GB 4208275A GB 1484965 A GB1484965 A GB 1484965A
Authority
GB
United Kingdom
Prior art keywords
lines
signals
alarm
gates
enabled
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
Application number
GB4208275A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nohmi Bosai Ltd
Original Assignee
Nohmi Bosai Kogyo Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nohmi Bosai Kogyo Co Ltd filed Critical Nohmi Bosai Kogyo Co Ltd
Publication of GB1484965A publication Critical patent/GB1484965A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire Alarms (AREA)
  • Alarm Systems (AREA)

Abstract

1484965 Alarm systems; selective signalling NOHMI BOSAI KOGYO CO Ltd 14 Oct 1975 [14 Oct 1974] 42082/75 Heading G4H In an alarm system, a plurality of signal lines L1-L4 pass through protected areas A1- A6 each containing an alarm device S, T arranged in response to the initiation D to apply pulsatory signals to the same predetermined number of lines (2 in Fig. 1) in a unique combination, the lines being connected to a central station C including means G1-G24 operative in response to the receipt of signals on any said combination of lines to provide alarm indications N1-N6 denotive of the area or areas in which an alarm has been initiated and not to respond to the receipt of signals on any number of signal lines other than the predetermined number. As described, a fire alarm has manually or automatically operated contacts D connected to a UJT relaxation oscillator S, which pulsewise earths a selected pair of lines L. Gates G1-G6 are enabled by signals on corresponding pairs of lines L, while gates G21-G24 are enabled if there are signals on any three lines; whenever a gate G21-G24 is enabled, the outputs of gates G1-G6 are blocked at gates G11-G16. The outputs of G11-G16 operate self-holding relays N1-N6. Fig. 4 illustrates the case of simultaneous alarms in A1 and A2 which gives rise to a spurious signal on L4, the resulting output from G4 being blocked by the output from G21.
GB4208275A 1974-10-14 1975-10-14 Alarm systems Expired GB1484965A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11792774A JPS5824836B2 (en) 1974-10-14 1974-10-14 Kasainadonotsuhousouchi

Publications (1)

Publication Number Publication Date
GB1484965A true GB1484965A (en) 1977-09-08

Family

ID=14723630

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4208275A Expired GB1484965A (en) 1974-10-14 1975-10-14 Alarm systems

Country Status (3)

Country Link
JP (1) JPS5824836B2 (en)
CH (1) CH598666A5 (en)
GB (1) GB1484965A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0072187A1 (en) * 1981-02-06 1983-02-16 Institute For Industrial Research And Standards Method and apparatus for identifying the location of a change in state of a part of an electrical circuit
FR2577315A1 (en) * 1984-11-16 1986-08-14 Thomson Csf LINEAR PRESSURE SENSOR.

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2759650C3 (en) * 1977-07-19 1981-11-19 Preussag Ag Feuerschutz, 2060 Bad Oldesloe Fire alarm device
DE2732583C3 (en) * 1977-07-19 1981-12-10 Preussag Ag Feuerschutz, 2060 Bad Oldesloe Fire alarm device
DE2828551C2 (en) * 1978-06-29 1984-08-09 Brown, Boveri & Cie Ag, 6800 Mannheim Circuit arrangement for querying contacts combined in a matrix
DE3326526A1 (en) * 1983-07-22 1985-01-31 Siemens AG, 1000 Berlin und 8000 München DANGER REPORTING SYSTEM
EP2543730B1 (en) 2010-03-04 2018-10-31 Chugai Seiyaku Kabushiki Kaisha Antibody constant region variant
MY166429A (en) 2010-11-17 2018-06-26 Chugai Pharmaceutical Co Ltd Multi-specific antigen-binding molecule having alternative function to function of blood coagulation factor viii
MY183415A (en) 2014-12-19 2021-02-18 Chugai Pharmaceutical Co Ltd Anti-c5 antibodies and methods of use

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0072187A1 (en) * 1981-02-06 1983-02-16 Institute For Industrial Research And Standards Method and apparatus for identifying the location of a change in state of a part of an electrical circuit
FR2577315A1 (en) * 1984-11-16 1986-08-14 Thomson Csf LINEAR PRESSURE SENSOR.

Also Published As

Publication number Publication date
JPS5824836B2 (en) 1983-05-24
CH598666A5 (en) 1978-05-12
JPS5144499A (en) 1976-04-16

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee