GB1183229A – Improvements in or relating to Control Circuits for Alarm Devices
– Google Patents
GB1183229A – Improvements in or relating to Control Circuits for Alarm Devices
– Google Patents
Improvements in or relating to Control Circuits for Alarm Devices
Info
Publication number
GB1183229A
GB1183229A
GB50418/67A
GB5041867A
GB1183229A
GB 1183229 A
GB1183229 A
GB 1183229A
GB 50418/67 A
GB50418/67 A
GB 50418/67A
GB 5041867 A
GB5041867 A
GB 5041867A
GB 1183229 A
GB1183229 A
GB 1183229A
Authority
GB
United Kingdom
Prior art keywords
relay
capacitor
lamp
supply
failure
Prior art date
1966-11-07
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
GB50418/67A
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.)
Pyrotector Inc
Original Assignee
Pyrotector Inc
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.)
1966-11-07
Filing date
1967-11-06
Publication date
1970-03-04
1967-11-06
Application filed by Pyrotector Inc
filed
Critical
Pyrotector Inc
1970-03-04
Publication of GB1183229A
publication
Critical
patent/GB1183229A/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
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
G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke
G—PHYSICS
G01—MEASURING; TESTING
G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
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
1,183,229. Fire alarms; lamp failure alarms. PYROTECTOR Inc. 6 Nov., 1967 [7 Nov., 1966], No. 50418/67. Headings G4F and G4N. In an alarm system, a relay R1 is normally energized by half cycles of an A.C. supply, a capacitor F1 supplying current during the missing half cycles; means are provided responsive to failure of a component in the system to inhibit the current from the capacitor F1 so that the relay emits an audible signal. As shown in Fig. 3, relay R1 is normally energized by A.C. supply E, half-wave rectified at D2, the current during the missing half cycles being supplied by capacitor F1. Light from a lamp 14 in a labyrinth (Fig. 1, not shown) is reflected by smoke on to a CdS cell C1, reducing its resistance and allowing a neon tube B1 to strike, illuminating a photo-resistive cell C2 which connects an opposing rectifier D1 to the relay R1; capacitor F1 by-passes the non-rectified full-wave current across the relay R1 so that it becomes de-energized, initiating an alarm A. Supply voltage compensation.-The standing voltage across the photo-resistive cell C1. is is stabilized by neon tubes B2, B3. Neon tubes B4, B5 are connected to the lower end of the neon tube B1 so as to compensate for the change insensitivity of the circuit due to variation in brightness of the main lamp 14 in the event of supply voltage fluctuation. Lamp failure alarm.-Failure of the main lamp 14 results in photo-resistive cell C3 becoming high resistance so that capacitor F1 becomes ineffective, hence relay R1 will chatter due to the unsmoothed half-wave rectified supply.
GB50418/67A
1966-11-07
1967-11-06
Improvements in or relating to Control Circuits for Alarm Devices
Expired
GB1183229A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US59261766A
1966-11-07
1966-11-07
Publications (1)
Publication Number
Publication Date
GB1183229A
true
GB1183229A
(en)
1970-03-04
Family
ID=24371402
Family Applications (2)
Application Number
Title
Priority Date
Filing Date
GB47341/69A
Expired
GB1183230A
(en)
1966-11-07
1967-11-06
Improvements in or relating to Control Circuits for Alarm Devices
GB50418/67A
Expired
GB1183229A
(en)
1966-11-07
1967-11-06
Improvements in or relating to Control Circuits for Alarm Devices
Family Applications Before (1)
Application Number
Title
Priority Date
Filing Date
GB47341/69A
Expired
GB1183230A
(en)
1966-11-07
1967-11-06
Improvements in or relating to Control Circuits for Alarm Devices
Country Status (3)
Country
Link
US
(1)
US3461443A
(en)
DE
(1)
DE1566721B1
(en)
GB
(2)
GB1183230A
(en)
Families Citing this family (10)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3879718A
(en)
*
1970-09-16
1975-04-22
Gordon A Roberts
Smoke detection unit with dual purpose alarm circuit
US3678499A
(en)
*
1970-10-27
1972-07-18
Gen Electric
Electronic digital clock power failure indicator
US3688297A
(en)
*
1970-10-27
1972-08-29
Gen Motors Corp
Lights out detector for providing a continuous indication of the failure of lamps which are illuminated intermittently or have intermittent failures
US3731105A
(en)
*
1972-05-19
1973-05-01
Litton Business Systems Inc
Arc suppressor for dielectric apparatus
US3846772A
(en)
*
1972-08-11
1974-11-05
Chubb Fire Security Ltd
Fire detector responsive to amplitude modulation of a pulsed em beam
AU497359B2
(en)
*
1974-11-27
1978-12-07
Pyrotector, Incorporated
Photoelectric smoke detector
FR2389949B1
(en)
*
1977-05-04
1981-06-12
Klaxon Sa
DE3016530A1
(en)
*
1980-04-29
1981-11-05
Hekatron GmbH, 7811 Sulzburg
LIGHT-OPTICAL DETECTION DEVICE FOR A FLOATING PARTICLE CONCENTRATION
JPS626181A
(en)
*
1985-07-02
1987-01-13
Mitsubishi Electric Corp
Abnormality detection device for gas insulating apparatus
US5349162A
(en)
*
1993-04-05
1994-09-20
Whirlpool Corporation
Fault detection method and apparatus for a domestic appliance
1966
1966-11-07
US
US592617A
patent/US3461443A/en
not_active
Expired – Lifetime
1967
1967-11-06
GB
GB47341/69A
patent/GB1183230A/en
not_active
Expired
1967-11-06
GB
GB50418/67A
patent/GB1183229A/en
not_active
Expired
1967-11-07
DE
DE19671566721
patent/DE1566721B1/en
active
Pending
Also Published As
Publication number
Publication date
GB1183230A
(en)
1970-03-04
US3461443A
(en)
1969-08-12
DE1566721B1
(en)
1970-12-10
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Legal Events
Date
Code
Title
Description
1970-07-15
PS
Patent sealed [section 19, patents act 1949]
1976-06-03
PLNP
Patent lapsed through nonpayment of renewal fees
