EP0122433A1 - Système d'alarme de feu pour appartements - Google Patents

Système d'alarme de feu pour appartements Download PDF

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Publication number
EP0122433A1
EP0122433A1 EP84102466A EP84102466A EP0122433A1 EP 0122433 A1 EP0122433 A1 EP 0122433A1 EP 84102466 A EP84102466 A EP 84102466A EP 84102466 A EP84102466 A EP 84102466A EP 0122433 A1 EP0122433 A1 EP 0122433A1
Authority
EP
European Patent Office
Prior art keywords
detector
fire
sensitivity
alarm system
fire alarm
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.)
Withdrawn
Application number
EP84102466A
Other languages
German (de)
English (en)
Inventor
Shoichi C/O Nohmi Bosai Kogyo Co. Ltd. Kimura
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 EP0122433A1 publication Critical patent/EP0122433A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas

Definitions

  • This invention relates to a fire alarm system for residential use.
  • sensitivities of fire detectors have been set to comparatively low levels to avoid that they will produce false alarms with cigarette smoke or heat from heating appliances and to permit their wide application.
  • the fire detectors With low sensitivities it is possible to build a reliable fire alarm system which does not produce an alarm with such a rise in ambient temperature as caused by room heating or with cigarette smoke.
  • an alarm is given only at an advanced stage of the fire. Therefore, for protection of general houses built with wood, it is preferable that the fire detectors have the highest possible sensitivity setting.
  • this invention is to offer a fire alarm system having a high sensitivity but less possibility of producing a false alarm, which is achieved by adjusting the sensitivities of the fire detectors to the ambient condition each time a fire is handled in lieu of the conventional thought of permanently fixing the sensitivities of the fire detectors.
  • the ionization type smoke detector 1 consists of outer ionization chamber 3; inner ionization chamber 4; FET 5 with its gate connected to the junction of the ionization chambers 3, 4, and its source equipped with bleeder resistors 6, 7 to determine a point at which the FET 5 becomes conductive, in other words the sensitivity of the detector; and a switching circuit 12 comprising resistors 8, 9, capacitor 10 and transistor 11.
  • the control panel 2 consists of power supply 13 for the detector 1 and control panel 2; push button switch 14 which is pressed when adjusting the sensitivity; timer 15 which is connected in series with the push button switch 14 and is capable of adjusting the set time; alarm relay 16 actuated as the switching circuit of the detector 1 switches on; self-holding contact 16-1 of the relay 16 connected in series with break contact 15 - 1 of the timer 15; alarm bell 17 connected in series with make contact 16 - 2 of the relay 16; and variable resistor 18 for sensitivity adjustment connected in series with make contact 15 - 2 of the timer 15 as sensitivity setting circuit, and between the source of the field effect transistor 5 of the detector 1 and plus terminal of the power supply 13.
  • the FET 5 becomes non-conductive, thus the sensitivity of the detector 1 is set to a highest possible level at which the detector 1 can remain unoperated under the condition that the range is being used.
  • the FET 5 immediately becomes conductive, causing the realy 16 to operate through the switching circuit 12 and the bell 17 to sound for alarm.
  • the make contact 15 - 2 opens due to action of the timer 15, and the sensitivity of the detector 1 returns to the fixed value determined by resistors 6, 7.
  • the detector is now set to a low sensitivity and continue surveillance of comparatively safe kitchen where no fire is being used after kitchen work.
  • the detector In the case of the fire alarm system installed in a living room, surveillance is normally made by the detector with low sensitivity which is determined by resistors 6, 7 and at which the detector is not actuated by cigarette smoke or heat from the heating appliance.
  • the detector When a housewife goes to kitchen, leaving her baby alone in the living room without putting off the heating appliance, the detector should be set to a high sensitivity under the condition that the heating appliance is in use as described for the case that the range is used in the kitchen.
  • the detector 1 even if the heating appliance is accidentally thrown down by baby and a fire occurs, the detector 1 immediately operates in the incipient stage of the fire and notifies her mother in the next room of the danger.
  • this invention offers a fire alarm system which does not produce an alarm even if soiling of the detector has changed the sensitivity because the sensitivity adjustment is made each time fire is used, and which is) capable of giving an alarm in the incipient stage of fire.
  • the drawing is a circuit diagram of an embodiment of the fire alarm system according to this invention.

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fire Alarms (AREA)
  • Fire-Detection Mechanisms (AREA)
EP84102466A 1983-03-23 1984-03-08 Système d'alarme de feu pour appartements Withdrawn EP0122433A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP4711983A JPS59173898A (ja) 1983-03-23 1983-03-23 家庭用などの火災報知機
JP47119/83 1983-03-23

Publications (1)

Publication Number Publication Date
EP0122433A1 true EP0122433A1 (fr) 1984-10-24

Family

ID=12766269

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84102466A Withdrawn EP0122433A1 (fr) 1983-03-23 1984-03-08 Système d'alarme de feu pour appartements

Country Status (2)

Country Link
EP (1) EP0122433A1 (fr)
JP (1) JPS59173898A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0345798A1 (fr) * 1988-06-10 1989-12-13 Cerberus Ag Système d'avertissement d'incendie
FR2640384A1 (fr) * 1988-12-13 1990-06-15 Morrison Co Ets Detecteur de gaz de combustion par ionisation
FR2689280A1 (fr) * 1992-03-30 1993-10-01 Pittway Corp Circuit de mise en silence d'alarme pour détecteur photoélectrique de fumée.
AU652097B2 (en) * 1992-05-25 1994-08-11 Nohmi Bosai Ltd Ionization type smoke detector
AU654438B2 (en) * 1992-05-25 1994-11-03 Nohmi Bosai Ltd Fire detector
WO2007009153A1 (fr) * 2005-07-18 2007-01-25 Gilbert Alain Garrick Procede permettant de faciliter l'acces a un operateur a des fonctions de dispositifs d'alarme utilises pour signaler un danger
WO2023192498A1 (fr) * 2022-03-30 2023-10-05 Johnson Controls Tyco IP Holdings LLP Commande dynamique de la sensibilité d'un détecteur dans des systèmes de commande d'alarme incendie

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6356797A (ja) * 1986-08-27 1988-03-11 株式会社竹中工務店 火災センサの感度設定方式
JP2583529Y2 (ja) * 1991-03-05 1998-10-22 ニッタン株式会社 火災感知器
JP4549494B2 (ja) * 2000-06-14 2010-09-22 ホーチキ株式会社 炎検出装置およびその検知感度設定方法
JP5164282B2 (ja) * 2010-04-28 2013-03-21 ホーチキ株式会社 炎検出装置およびその検知感度設定方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2530848A1 (de) * 1974-07-20 1976-02-05 Nohmi Bosai Kogyo Co Ltd Brandmelder
DE2454196B2 (de) * 1974-06-14 1980-02-21 Cerberus Ag, Maennedorf, Zuerich (Schweiz) Brandmelder
US4313110A (en) * 1980-02-19 1982-01-26 Thomas Subulak Smoke alarm having temporary disabling features

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50123299A (fr) * 1974-03-15 1975-09-27
US3952145A (en) * 1974-11-12 1976-04-20 Rca Corporation Pickup arm cartridge apparatus
JPS56132690A (en) * 1980-03-19 1981-10-17 Hochiki Co Fire detector
JPS5737272U (fr) * 1980-08-11 1982-02-27
JPS57141791A (en) * 1981-02-27 1982-09-02 Mitsubishi Electric Corp Malfunctioning preventor for fire sensor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2454196B2 (de) * 1974-06-14 1980-02-21 Cerberus Ag, Maennedorf, Zuerich (Schweiz) Brandmelder
DE2530848A1 (de) * 1974-07-20 1976-02-05 Nohmi Bosai Kogyo Co Ltd Brandmelder
US4313110A (en) * 1980-02-19 1982-01-26 Thomas Subulak Smoke alarm having temporary disabling features

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0345798A1 (fr) * 1988-06-10 1989-12-13 Cerberus Ag Système d'avertissement d'incendie
US4975684A (en) * 1988-06-10 1990-12-04 Cerberus Ag Fire detecting system
FR2640384A1 (fr) * 1988-12-13 1990-06-15 Morrison Co Ets Detecteur de gaz de combustion par ionisation
WO1990007169A1 (fr) * 1988-12-13 1990-06-28 Etablissements Morrison & Co Detecteur de gaz de combustion par ionisation
FR2689280A1 (fr) * 1992-03-30 1993-10-01 Pittway Corp Circuit de mise en silence d'alarme pour détecteur photoélectrique de fumée.
AU652097B2 (en) * 1992-05-25 1994-08-11 Nohmi Bosai Ltd Ionization type smoke detector
AU654438B2 (en) * 1992-05-25 1994-11-03 Nohmi Bosai Ltd Fire detector
WO2007009153A1 (fr) * 2005-07-18 2007-01-25 Gilbert Alain Garrick Procede permettant de faciliter l'acces a un operateur a des fonctions de dispositifs d'alarme utilises pour signaler un danger
WO2023192498A1 (fr) * 2022-03-30 2023-10-05 Johnson Controls Tyco IP Holdings LLP Commande dynamique de la sensibilité d'un détecteur dans des systèmes de commande d'alarme incendie

Also Published As

Publication number Publication date
JPS59173898A (ja) 1984-10-02

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19840308

AK Designated contracting states

Designated state(s): BE CH DE FR GB IT LI

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19850725

RIN1 Information on inventor provided before grant (corrected)

Inventor name: KIMURA, SHOICHIC/O NOHMI BOSAI KOGYO CO., LTD.