GB632279A - Improvements in fire alarm apparatus - Google Patents

Improvements in fire alarm apparatus

Info

Publication number
GB632279A
GB632279A GB31185/47A GB3118547A GB632279A GB 632279 A GB632279 A GB 632279A GB 31185/47 A GB31185/47 A GB 31185/47A GB 3118547 A GB3118547 A GB 3118547A GB 632279 A GB632279 A GB 632279A
Authority
GB
United Kingdom
Prior art keywords
relay
resistance
coil
series
temperature
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
GB31185/47A
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.)
P E C O ELECTRICAL CONTRACTORS
Original Assignee
P E C O ELECTRICAL CONTRACTORS
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
Priority to BE488984D priority Critical patent/BE488984A/xx
Application filed by P E C O ELECTRICAL CONTRACTORS filed Critical P E C O ELECTRICAL CONTRACTORS
Priority to GB31185/47A priority patent/GB632279A/en
Priority to US60790A priority patent/US2587762A/en
Publication of GB632279A publication Critical patent/GB632279A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/06—Electric actuation of the alarm, e.g. using a thermally-operated switch

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Emergency Alarm Devices (AREA)
  • Fire Alarms (AREA)
  • Fire-Detection Mechanisms (AREA)

Abstract

632,279. Fire alarms. P.E.C.O. (ELECTRICAL CONTRACTORS), Ltd., and REECE, M. P. Nov. 25, 1947, No. 31185. [Class 47 (i)] [Also in Group XXXVIII] A fire alarm operated by the temperature of the surrounding air comprises a detector 1 consisting of a loosely-wound resistance-coil a and a closely-wound and insulated resistance coil d arranged in parallel with one another and each in series with a coil e or f of a relay 51 controlling a movable contact 11 which cooperates with fixed contacts g, h to operate a lamp 61 and, through a relay 12, a bell 81. A number of detectors 1 may be arranged with their coils a, d separately in series. The coils e, f of the relay 51 are balanced by a potentiometer R<SP>1</SP>, but are unbalanced, upon a rapid rise in temperature, by changes in the resistances a, d, and, upon a slow rise in temperature, by a resistance b in series with the resistance a and normally short-circuited by a wire c connected by an easily fusible alloy 6. The system is automatically re-set due to a resistance R2 arranged across the coil f being thrown into circuit by a contact 14 closed by the relay 12. For testing the system, a two-way switch 23 may be provided which normally completes the circuit between the resistance R<SP>2</SP> and the point 24, but when switched over, puts the potentiometer R<SP>1</SP> in shunt with the coil e to upset the balance. A fault is indicated by a lamp 18 and, through a relay 19, a buzzer 21, controlled by a switch 17, closed by a relay 15 when the current therethrough falls below a predetermined value.
GB31185/47A 1947-11-25 1947-11-25 Improvements in fire alarm apparatus Expired GB632279A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE488984D BE488984A (en) 1947-11-25
GB31185/47A GB632279A (en) 1947-11-25 1947-11-25 Improvements in fire alarm apparatus
US60790A US2587762A (en) 1947-11-25 1948-11-18 Fire alarm apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB31185/47A GB632279A (en) 1947-11-25 1947-11-25 Improvements in fire alarm apparatus

Publications (1)

Publication Number Publication Date
GB632279A true GB632279A (en) 1949-11-18

Family

ID=10319272

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31185/47A Expired GB632279A (en) 1947-11-25 1947-11-25 Improvements in fire alarm apparatus

Country Status (3)

Country Link
US (1) US2587762A (en)
BE (1) BE488984A (en)
GB (1) GB632279A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2667630A (en) * 1950-12-22 1954-01-26 Jorgensen Asger Lars Automatic fire alarm system

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2759174A (en) * 1952-08-26 1956-08-14 American District Telegraph Co Fire detector
US2827624A (en) * 1955-10-27 1958-03-18 Specialties Dev Corp Electrical network for detecting heat due to various causes
US3798971A (en) * 1971-11-01 1974-03-26 Lowrance Electronics Mfg Temperature differential sensor for gliders
US4521120A (en) * 1983-09-15 1985-06-04 The United States Of America As Represented By The Secretary Of Agriculture Forest fire rate of spread with timers method

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US419710A (en) * 1890-01-21 Electric protective system
US245272A (en) * 1881-08-09 beight
US2000074A (en) * 1928-03-08 1935-05-07 Kidde & Co Walter Supervised electric system
US2003358A (en) * 1929-11-21 1935-06-04 Kidde & Co Walter System for indicating the presence and location of fire
US1954832A (en) * 1930-02-11 1934-04-17 Vega Manuf Automatic starter
US2003443A (en) * 1931-06-09 1935-06-04 American Telephone & Telegraph Contactor indicator
US2236891A (en) * 1937-07-17 1941-04-01 Gamewell Co Fire alarm system
US2219262A (en) * 1937-07-21 1940-10-22 Western Union Telegraph Co System for detecting and locating defects in cable sheaths
US2302593A (en) * 1940-02-09 1942-11-17 Brown Instr Co Control apparatus
US2448575A (en) * 1942-06-18 1948-09-07 Brown Instr Co Electrical instrument follow-up system
US2412471A (en) * 1943-07-02 1946-12-10 Honeywell Regulator Co Air-speed responsive device
US2398892A (en) * 1943-07-08 1946-04-23 Edison Inc Thomas A Resistor bulb

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2667630A (en) * 1950-12-22 1954-01-26 Jorgensen Asger Lars Automatic fire alarm system

Also Published As

Publication number Publication date
BE488984A (en)
US2587762A (en) 1952-03-04

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