GB1163121A - Improvements in and relating to Fire Alarm Apparatus. - Google Patents
Improvements in and relating to Fire Alarm Apparatus.Info
- Publication number
- GB1163121A GB1163121A GB36662/66A GB3666266A GB1163121A GB 1163121 A GB1163121 A GB 1163121A GB 36662/66 A GB36662/66 A GB 36662/66A GB 3666266 A GB3666266 A GB 3666266A GB 1163121 A GB1163121 A GB 1163121A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrode
- chamber
- smoke
- conduct
- wire mesh
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
- G01T7/12—Provision for actuation of an alarm
- G01T7/125—Alarm- or controlling circuits using ionisation chambers, proportional counters or Geiger-Mueller tubes, also functioning as UV detectors
-
- 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
-
- 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
- G08B17/113—Constructional details
Landscapes
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Emergency Management (AREA)
- Life Sciences & Earth Sciences (AREA)
- High Energy & Nuclear Physics (AREA)
- Molecular Biology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Fire-Detection Mechanisms (AREA)
- Alarm Systems (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
1,163,121. Smoke detectors. NITTAN CO. Ltd. Aug.16, 1966 [March 30, 1966], No.36662/66. Heading G1N. [Also in Division H1] A smoke detector for a fire alarm system comprises a closed ionisation chamber 5, Fig.2, surrounded by a second ionisation chamber 8 open to the atmosphere through a wire mesh 6. A cupshaped electrode 1, forming part of the walls of the inner chamber, is common to both chambers and carries, on both sides, radio-active sources 2, 3, e.g. of radium. The second electrode of the inner chamber is provided by a disc 9 carried on an insulating support 5', e.g. of acrylic resin. Cylindrical members 7 together with the wire mesh 6 form the second electrode of the outer chamber. The common electrode 1 is connected to the gate electrode of an FET, Fig.3, normally arranged to be non-conducting. In the presence of smoke in the open ionisation chamber the voltage between the gate and source electrodes of the FET increases causing it to conduct. This in turn causes Zener diode D to conduct to trigger an SCR thereby producing a signal in receiver R which is used to energize an alarm. Reference has been directed by the Comptroller to Specification 1, 009, 271.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1966028133U JPS446089Y1 (en) | 1966-03-30 | 1966-03-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1163121A true GB1163121A (en) | 1969-09-04 |
Family
ID=12240260
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB36662/66A Expired GB1163121A (en) | 1966-03-30 | 1966-08-16 | Improvements in and relating to Fire Alarm Apparatus. |
Country Status (4)
Country | Link |
---|---|
US (1) | US3500368A (en) |
JP (1) | JPS446089Y1 (en) |
BE (1) | BE686726A (en) |
GB (1) | GB1163121A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2138570A (en) * | 1983-04-19 | 1984-10-24 | Emi Ltd | Smoke detector |
Families Citing this family (33)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1277091A (en) * | 1968-07-11 | 1972-06-07 | Nittan Co Ltd | Ionization type smoke detectors |
USRE30323E (en) * | 1968-09-26 | 1980-07-01 | Hochiki Kabushiki Kaisha | Smoke detector adapted to a smoke sensing apparatus |
GB1280304A (en) * | 1968-09-26 | 1972-07-05 | Hochiki Co | A smoke sensing detector for smoke sensing apparatus |
US3573777A (en) * | 1968-12-09 | 1971-04-06 | Honeywell Inc | Combustion products detector control apparatus |
US3657713A (en) * | 1969-06-02 | 1972-04-18 | Nittan Co Ltd | Device for testing ionization smoke detector |
DE2029485B2 (en) * | 1969-06-21 | 1971-11-25 | Nittan Co. Ltd., Tokio | IONIZATION SMOKE SENSORS |
CH497755A (en) * | 1969-06-24 | 1970-10-15 | Cerberus Ag | Ionization fire alarms |
ZA704724B (en) * | 1969-07-22 | 1971-03-31 | Nittan Co Ltd | Ionization smoke detector |
NL7010779A (en) * | 1969-07-24 | 1971-01-26 | ||
US3717862A (en) * | 1969-10-16 | 1973-02-20 | Nittan Co Ltd | Fire detecting system and testing means therefor |
US3657737A (en) * | 1969-12-29 | 1972-04-18 | Jeffrey E Hamm | Method of and device for smoke detection and circuits therefor |
US3736445A (en) * | 1970-01-12 | 1973-05-29 | Medar Inc | Proximity detector |
US3775616A (en) * | 1970-06-08 | 1973-11-27 | Nittan Co Ltd | Ionization smoke detector |
CH508251A (en) * | 1970-07-23 | 1971-05-31 | Cerberus Ag | Ionization fire alarms |
US3792254A (en) * | 1971-07-15 | 1974-02-12 | Vigifeu | Ionization chamber in particular for a fire detection device |
BE790355A (en) * | 1971-10-20 | 1973-02-15 | Bevaknings A B Securitas | SMOKE DETECTOR |
JPS5551239B2 (en) * | 1971-12-29 | 1980-12-23 | ||
US3866195A (en) * | 1973-05-07 | 1975-02-11 | Fire Alert Company | Combustion product detector and method of calibrating |
US3909815A (en) * | 1973-06-01 | 1975-09-30 | Gamma Electronic | Detector for fumes and combustion gases |
US4091364A (en) * | 1974-09-09 | 1978-05-23 | Unitec, Inc. | Combustion detection device |
BE831296A (en) * | 1975-07-11 | 1975-11-03 | ION DETECTOR | |
JPS52111590U (en) * | 1976-02-20 | 1977-08-24 | ||
US4097850A (en) * | 1976-11-01 | 1978-06-27 | Pittway Corporation | Means for adjusting and for testing a detecting device |
US4138664A (en) * | 1976-12-14 | 1979-02-06 | Pittway Corporation | Warning device |
US4148023A (en) * | 1977-05-02 | 1979-04-03 | E.D.I. Safety Devices, Inc. | Emergency exit indicator |
JPS583195Y2 (en) * | 1977-10-20 | 1983-01-20 | ツエルベルス・アクチェン・ゲゼルシャフト | Ionic fire detector |
US4187432A (en) * | 1978-03-16 | 1980-02-05 | NRD, Division of Mark IV Industries, Inc. | Source holder for mounting radioactive foil and holder-foil assembly |
CA1148279A (en) * | 1979-12-14 | 1983-06-14 | Andreas Scheidweiler | Ionization smoke detector with increased operational reliability |
US4396840A (en) * | 1980-10-01 | 1983-08-02 | Matsushita Electric Works, Ltd. | Ionization type smoke sensing device |
US4471346A (en) * | 1981-06-02 | 1984-09-11 | Eberhard Faber, Inc. | Smoke detector |
JP2006011540A (en) * | 2004-06-22 | 2006-01-12 | Nittan Co Ltd | Ionization type smoke sensor |
CN106324092A (en) * | 2016-08-08 | 2017-01-11 | 清华大学 | Device for on-line monitoring of the defects of fan's main shaft using electromagnetic ultrasonic guided-wave and the operation method thereof |
KR102458479B1 (en) * | 2017-09-28 | 2022-10-25 | 삼성전자 주식회사 | Electronic device and method for controlling using the electronic device |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2646556A (en) * | 1950-06-17 | 1953-07-21 | C O Two Fire Equipment Co | Supervised alarm system |
US2702898A (en) * | 1953-10-06 | 1955-02-22 | Electro Watt Electrical And In | Gas-responsive control apparatus |
US3271756A (en) * | 1960-03-22 | 1966-09-06 | Harold J Burke | Method and apparatus for detecting a hazardous condition |
US3078450A (en) * | 1961-08-03 | 1963-02-19 | Martin J Mcginn | Pressure compensated ionization chamber fire detector system |
US3301307A (en) * | 1963-11-12 | 1967-01-31 | Ngk Insulators Ltd | Device for detecting the configuration of a burning flame |
US3310724A (en) * | 1964-04-27 | 1967-03-21 | Gen Electric | Battery charging regulators |
-
1966
- 1966-03-30 JP JP1966028133U patent/JPS446089Y1/ja not_active Expired
- 1966-08-16 GB GB36662/66A patent/GB1163121A/en not_active Expired
- 1966-08-18 US US573284A patent/US3500368A/en not_active Expired - Lifetime
- 1966-09-12 BE BE686726D patent/BE686726A/xx unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2138570A (en) * | 1983-04-19 | 1984-10-24 | Emi Ltd | Smoke detector |
Also Published As
Publication number | Publication date |
---|---|
JPS446089Y1 (en) | 1969-03-05 |
DE1516529B1 (en) | 1970-06-25 |
BE686726A (en) | 1967-02-15 |
US3500368A (en) | 1970-03-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |