GB1049340A - Improved apparatus for heat detection - Google Patents

Improved apparatus for heat detection

Info

Publication number
GB1049340A
GB1049340A GB48648/64A GB4864864A GB1049340A GB 1049340 A GB1049340 A GB 1049340A GB 48648/64 A GB48648/64 A GB 48648/64A GB 4864864 A GB4864864 A GB 4864864A GB 1049340 A GB1049340 A GB 1049340A
Authority
GB
United Kingdom
Prior art keywords
alarm
circuit
scr
extension
bell
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
GB48648/64A
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.)
Individual
Original Assignee
Individual
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 US239440A priority Critical patent/US3177479A/en
Application filed by Individual filed Critical Individual
Priority to GB48648/64A priority patent/GB1049340A/en
Publication of GB1049340A publication Critical patent/GB1049340A/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
    • 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
    • G08B29/12—Checking intermittently signalling or alarm systems
    • G08B29/14—Checking intermittently signalling or alarm systems checking the detection circuits
    • G08B29/145—Checking intermittently signalling or alarm systems checking the detection circuits of fire detection circuits
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • 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

1,049,340. Temperature alarm systems. J. E. LINDBERG. Nov. 30, 1964, No. 48648/64. Heading G4N. [Also in Division G1] In a temperature alarm system comprising an elongated sensing element, e.g. of the type described in Specification 961,143, the element A, Fig. 4, is provided with an extension D, Fig. 3 (not shown), connected to a test circuit. The critical temperature of the extension D may be lower than that of the main element A. Alarm circuit.-Upon the sensing element A attaining its critical temperature, switch B closes, lighting lamps C and applying a firing pulse to SCR 60 which conducts to ring bell 64. If the audible alarm is cancelled by actuating switch 83, SCR 60 is cut off, and on reclosing switch 83 the bias on the SCR 60 is insufficient for it to restrike so that the bell circuit is not re-made although lamps 70 remain lit due to the persistence of the alarm condition. Other alarm circuits with their own visual alarms may be coupled to the SCR 60 so that the bell s unds whenever any sensing element attains its critical temperature. In a modification, Fig. 5 (not shown), the transformer 74 is omitted, the SCR 60 being triggered by the potential developed across a resistor in series with the lamp circuit. Test circuit.-In its simplest form, Fig. 3 (not shown), the circuit is tested by heating the extension D by means of a manually operated heater circuit until the alarm operates.
GB48648/64A 1962-11-23 1964-11-30 Improved apparatus for heat detection Expired GB1049340A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US239440A US3177479A (en) 1962-11-23 1962-11-23 Heat detection apparatus
GB48648/64A GB1049340A (en) 1964-11-30 1964-11-30 Improved apparatus for heat detection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB48648/64A GB1049340A (en) 1964-11-30 1964-11-30 Improved apparatus for heat detection

Publications (1)

Publication Number Publication Date
GB1049340A true GB1049340A (en) 1966-11-23

Family

ID=10449396

Family Applications (1)

Application Number Title Priority Date Filing Date
GB48648/64A Expired GB1049340A (en) 1962-11-23 1964-11-30 Improved apparatus for heat detection

Country Status (1)

Country Link
GB (1) GB1049340A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2176600A (en) * 1985-06-21 1986-12-31 Francis Edward Mckenna Fire hazard detection system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2176600A (en) * 1985-06-21 1986-12-31 Francis Edward Mckenna Fire hazard detection system

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