GB470902A - Improvements in or relating to thermally operated fire-alarm apparatus - Google Patents

Improvements in or relating to thermally operated fire-alarm apparatus

Info

Publication number
GB470902A
GB470902A GB2445/37A GB244537A GB470902A GB 470902 A GB470902 A GB 470902A GB 2445/37 A GB2445/37 A GB 2445/37A GB 244537 A GB244537 A GB 244537A GB 470902 A GB470902 A GB 470902A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
gas
tube
filled
reached
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
GB2445/37A
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.)
Compagnie des Telephones Thomson Houston
Original Assignee
Compagnie des Telephones Thomson Houston
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 Compagnie des Telephones Thomson Houston filed Critical Compagnie des Telephones Thomson Houston
Publication of GB470902A publication Critical patent/GB470902A/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
    • G08B17/04—Hydraulic or pneumatic actuation of the alarm, e.g. by change of fluid pressure

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • General Physics & Mathematics (AREA)
  • Fire-Detection Mechanisms (AREA)

Abstract

470,902. Thermal switches. COMPAGNIE DES TELEPHONES THOMSONHOUSTON. Jan. 27, 1937, No. 2445. Convention date, Feb. 29, 1936. [Class 38 (v)] In a fire-alarm apparatus having an air or gas filled exploring tube 12 leading to a chamber 15 that is separated from a chamber 2 by a diaphragm 4 with a small orifice 5, a sudden rise in temperature causing movement of the diaphragm and opening of a circuit at a screw contact 6, provision is also made for the circuit to be opened when a maximum temperature is reached ' even though the rise has been slow. This is effected by a series of gas-filled chambers 13, 14 arranged at points along the tube 12 but prevented from communicating therewith by a fusible barrier which breaks down when the maximum temperature is reached and allows a sudden rush of gas to enter the tube 12 and operate the diaphragm 4. The barrier which is installed at 20 may comprise, Fig. 4, a dished member 26 having holes 28 and embedded in a lead ring 27, the interior of the dished member being filled with a fusible alloy 29. The chambers 13, 14 are adapted to be mounted on brackets which hold them well away from the wall.
GB2445/37A 1936-02-29 1937-01-27 Improvements in or relating to thermally operated fire-alarm apparatus Expired GB470902A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR470902X 1936-02-29

Publications (1)

Publication Number Publication Date
GB470902A true GB470902A (en) 1937-08-24

Family

ID=8902557

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2445/37A Expired GB470902A (en) 1936-02-29 1937-01-27 Improvements in or relating to thermally operated fire-alarm apparatus

Country Status (1)

Country Link
GB (1) GB470902A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2427088A (en) * 1943-02-03 1947-09-09 Electro Protective Corp Thermal fire protective system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2427088A (en) * 1943-02-03 1947-09-09 Electro Protective Corp Thermal fire protective system

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