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GB750843A - Improvements in heat sensitive electrical devices - Google Patents

Improvements in heat sensitive electrical devices

Info

Publication number
GB750843A
GB750843A GB563454A GB563454A GB750843A GB 750843 A GB750843 A GB 750843A GB 563454 A GB563454 A GB 563454A GB 563454 A GB563454 A GB 563454A GB 750843 A GB750843 A GB 750843A
Authority
GB
United Kingdom
Prior art keywords
bank
devices
switch
feb
conductors
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
GB563454A
Inventor
Edward Henry Reynolds
Wilfred Arthur Walker
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.)
Balfour Beatty PLC
Original Assignee
BICC PLC
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 BICC PLC filed Critical BICC PLC
Priority to GB563454A priority Critical patent/GB750843A/en
Priority to US487607A priority patent/US2842648A/en
Priority to FR1123668D priority patent/FR1123668A/en
Priority to BE535973D priority patent/BE535973A/xx
Publication of GB750843A publication Critical patent/GB750843A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/04—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having negative temperature coefficient
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/32—Insulated conductors or cables characterised by their form with arrangements for indicating defects, e.g. breaks or leaks

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fire-Detection Mechanisms (AREA)

Abstract

750,843. Fire alarm systems. BRITISH INSULATED CALLENDER'S CABLES, Ltd. Feb. 25, 1955 [Feb. 25, 1954; May 14, 1954; May 14, 1954; May 14, 1954], Nos. 5634/54, 14263/54, 14264/54 and 14265/54. Class 118(1) [Also in Group XXXVI] A fire alarm system comprises one or more temperature-sensitive devices (see Group XXXVI), two conductors of which are connected to an electric supply by a circuit which includes a device responsive to a fall of resistance between the conductors. In one arrangement, four devices 53-56 are connected to terminals of one bank 57 of a two-bank uni-selector switch. The corresponding terminals of the other bank 58 are connected to lamps 59-62. As the switch rotates the devices 53-56 are successively connected with a D.C. supply 63 through a relay coil 64. When one of the devices 53-56 becomes conductive the relay 64 breaks the power supply to the switch so that it stops in the position in which the moving arm of bank 57 makes contact with the terminal connected to the device in question. The corresponding lamp remains alight until the switch is restarted or until the conductivity of the device in question falls.
GB563454A 1954-02-25 1954-02-25 Improvements in heat sensitive electrical devices Expired GB750843A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB563454A GB750843A (en) 1954-02-25 1954-02-25 Improvements in heat sensitive electrical devices
US487607A US2842648A (en) 1954-02-25 1955-02-11 Heat sensitive electric cables
FR1123668D FR1123668A (en) 1954-02-25 1955-02-23 Improvements to heat sensitive electric cables
BE535973D BE535973A (en) 1954-02-25 1955-02-24

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB563454A GB750843A (en) 1954-02-25 1954-02-25 Improvements in heat sensitive electrical devices
GB1426354 1954-05-14
GB1426454 1954-05-14
GB1426554 1954-05-14

Publications (1)

Publication Number Publication Date
GB750843A true GB750843A (en) 1956-06-20

Family

ID=32329934

Family Applications (1)

Application Number Title Priority Date Filing Date
GB563454A Expired GB750843A (en) 1954-02-25 1954-02-25 Improvements in heat sensitive electrical devices

Country Status (3)

Country Link
BE (1) BE535973A (en)
FR (1) FR1123668A (en)
GB (1) GB750843A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1122739B (en) * 1958-11-04 1962-01-25 Albiswerk A G Grid-like radiation detector working according to the bolometer principle
US5281488A (en) * 1992-09-15 1994-01-25 Poulsen Peder Ulrik Foil strip conductor

Also Published As

Publication number Publication date
BE535973A (en) 1958-12-19
FR1123668A (en) 1956-09-25

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