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GB1197108A - Heat Actuated Contact Unit for Electrical Fire Alarm Systems - Google Patents

Heat Actuated Contact Unit for Electrical Fire Alarm Systems

Info

Publication number
GB1197108A
GB1197108A GB33911/68A GB3391168A GB1197108A GB 1197108 A GB1197108 A GB 1197108A GB 33911/68 A GB33911/68 A GB 33911/68A GB 3391168 A GB3391168 A GB 3391168A GB 1197108 A GB1197108 A GB 1197108A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
contact
chambers
fire alarm
spring
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
GB33911/68A
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.)
Fire Fighting Equipment Pty Ltd
Original Assignee
Fire Fighting Equipment Pty Ltd
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 claimed from AU29962/67A external-priority patent/AU405535B2/en
Application filed by Fire Fighting Equipment Pty Ltd filed Critical Fire Fighting Equipment Pty Ltd
Publication of GB1197108A publication Critical patent/GB1197108A/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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
    • H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
    • H01H37/767—Normally open

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Fire-Detection Mechanisms (AREA)

Abstract

1,197,108. Thermal switches. FIRE FIGHTING EQUIPMENT PTY. Ltd. 16 July, 1968 [16 Nov., 1967], No. 33911/68. Heading H1N. A heat-actuated contact unit for a fire alarm system comprises a diaphragm 15, Fig. 2, between two air tight chambers A, B and arranged to close an electrical circuit between contacts 11, 12 under a pressure differential between the chambers A, B due to a fast rise of ambient temperature but which is also operable by a spring 20 released by low melting point solder 24 on a heat transfer cap 18 forming the chamber B. The diaphragm 15 is soldered on a metal sleeve insert 13 which is secured by adhesive together with the cap 18 in a recess of the base 1. In the example one terminal contact 11 engages the sleeve 13 which a second terminal contact 12 is engaged by the diaphragm 15 to close the circuit. The diaphragm 15 may have a plug of low melting point solder for venting between the chambers A and B at higher temperatures when the diaphragm is actuated by the spring 20. In a modification the diaphragm moves a spring arm contact into engagement with a fixed contact.
GB33911/68A 1967-11-16 1968-07-16 Heat Actuated Contact Unit for Electrical Fire Alarm Systems Expired GB1197108A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU29962/67A AU405535B2 (en) 1967-11-16 Heat actuated contact unit fcr electrical fire alarm systems

Publications (1)

Publication Number Publication Date
GB1197108A true GB1197108A (en) 1970-07-01

Family

ID=3717912

Family Applications (1)

Application Number Title Priority Date Filing Date
GB33911/68A Expired GB1197108A (en) 1967-11-16 1968-07-16 Heat Actuated Contact Unit for Electrical Fire Alarm Systems

Country Status (2)

Country Link
US (1) US3569892A (en)
GB (1) GB1197108A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5612662A (en) * 1995-02-07 1997-03-18 Siemens Aktiengesellschaft Thermal fuse and method for its activation
DE102006041123B4 (en) * 2006-09-01 2009-03-12 Beru Ag Electrical circuit with a thermal-mechanical fuse

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1284950A (en) * 1915-03-13 1918-11-12 S M Loomis Automatic electric fire-alarm.
US2413140A (en) * 1941-12-12 1946-12-24 Fire Devices Inc Thermostat
US2318480A (en) * 1942-06-30 1943-05-04 William B Griffith Thermostat
US2428838A (en) * 1943-09-30 1947-10-14 John H Derby Thermostatic fire detector
US2389429A (en) * 1944-11-17 1945-11-20 William B Griffith Thermostat

Also Published As

Publication number Publication date
US3569892A (en) 1971-03-09

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees