GB1374418A – Fire detection systems and apparatus
– Google Patents
GB1374418A – Fire detection systems and apparatus
– Google Patents
Fire detection systems and apparatus
Info
Publication number
GB1374418A
GB1374418A
GB5492970A
GB5492970A
GB1374418A
GB 1374418 A
GB1374418 A
GB 1374418A
GB 5492970 A
GB5492970 A
GB 5492970A
GB 5492970 A
GB5492970 A
GB 5492970A
GB 1374418 A
GB1374418 A
GB 1374418A
Authority
GB
United Kingdom
Prior art keywords
detectors
signal
output
alarm
response
Prior art date
1971-11-12
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
GB5492970A
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.)
EMI Ltd
Original Assignee
EMI 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.)
1971-11-12
Filing date
1971-11-12
Publication date
1974-11-20
1971-11-12
Application filed by EMI Ltd
filed
Critical
EMI Ltd
1971-11-12
Priority to GB5492970A
priority
Critical
patent/GB1374418A/en
1974-11-20
Publication of GB1374418A
publication
Critical
patent/GB1374418A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
G08B29/16—Security signalling or alarm systems, e.g. redundant systems
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
Abstract
1374418 Fire alarms EMI Ltd 12 Nov 1971 [19 Nov 1970] 54929/70 Heading G4N [Also in Division A5] A fire detection system comprises at least three fire detectors for producing output signals in response to phenomena occurring in the case of fire and means for producing an alarm signal in response to an output signal from a first of said detectors and in response to a combined output from two others of said detectors. The detectors are mounted in a head 3 on a telescopic mast 2 supported by a portable control unit 1. The first detector 11 is responsive to a temperature rise above 90‹ C. whilst the other two detectors 9, 10 are respectively responsive to smoke and to temperature above 58‹ C. The detectors 9 … 11 and associated transistors 12 … 14 are mounted in the head 3 and connected by a convoluted cable 24 to the control unit 1. In the event of an output from detectors 9 or 10 alone, a signal of + 9À6 V is fed to transistor 31, the output of which is then sufficient to operate a threshold circuit B which turns on a 1Hz multivibrator 35 so as to provide intermittent operation of a relay 37 and audible alarm 38. Relay 37 provides flashing of lamps 4a, 4b and 5a, 5b mounted on the head 3. A combined response from detectors 9, 10, or a response from the high temperature detector 11 results in a signal of + 13À2V being fed to transistor 31 which signal also operates threshold unit C which overrides the output from the multivibrator 39 and gives continuous operation of the alarm 38 and lamps 4a … 5b. Fire extinguishing.-A signal on line 43 opens a valve 7 which releases BCF extinguishant from a container 6. A switch 44 is also opened so as to allow operation of a 10 kHz unijunction transistor oscillator 45 to feed signals along line 32 to a remote alarm. Fault detection.-A line-terminating transistor 26 is included in the head 3 which normally maintains + 6V at the base of transistor 31. In the event of this voltage becoming reduced, a threshold unit D is operated which turns on a multivibrator 41, giving intermittent operation of an alarm 42 and continuous operation of a lamp 4c. Undesired release of extinguishant will open switch 44, operate a lamp 4d and an audible alarm.
GB5492970A
1971-11-12
1971-11-12
Fire detection systems and apparatus
Expired
GB1374418A
(en)
Priority Applications (1)
Application Number
Priority Date
Filing Date
Title
GB5492970A
GB1374418A
(en)
1971-11-12
1971-11-12
Fire detection systems and apparatus
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
GB5492970A
GB1374418A
(en)
1971-11-12
1971-11-12
Fire detection systems and apparatus
Publications (1)
Publication Number
Publication Date
GB1374418A
true
GB1374418A
(en)
1974-11-20
Family
ID=10472493
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB5492970A
Expired
GB1374418A
(en)
1971-11-12
1971-11-12
Fire detection systems and apparatus
Country Status (1)
Country
Link
GB
(1)
GB1374418A
(en)
Cited By (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2142757A
(en)
*
1983-05-21
1985-01-23
Graviner Ltd
Improvements in and relating to fire and explosion detection and suppression
GB2205493A
(en)
*
1987-06-05
1988-12-14
John Gavin Beaumont
Portable fire extinguisher
GB2252191A
(en)
*
1991-01-18
1992-07-29
Hochiki Co
Combined method of determining fires
1971
1971-11-12
GB
GB5492970A
patent/GB1374418A/en
not_active
Expired
Cited By (6)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2142757A
(en)
*
1983-05-21
1985-01-23
Graviner Ltd
Improvements in and relating to fire and explosion detection and suppression
GB2205493A
(en)
*
1987-06-05
1988-12-14
John Gavin Beaumont
Portable fire extinguisher
GB2205493B
(en)
*
1987-06-05
1990-12-12
John Gavin Beaumont
Improvements in or relating to safety apparatus
GB2252191A
(en)
*
1991-01-18
1992-07-29
Hochiki Co
Combined method of determining fires
AU650938B2
(en)
*
1991-01-18
1994-07-07
Hochiki Kabushiki Kaisha
Combined method of determining fires
GB2252191B
(en)
*
1991-01-18
1994-10-12
Hochiki Co
Method of determining fires
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Legal Events
Date
Code
Title
Description
1975-04-03
PS
Patent sealed
1977-11-16
435
Patent endorsed ‘licences of right’ on the date specified (sect. 35/1949)
1982-06-16
PCNP
Patent ceased through non-payment of renewal fee
