GB1379535A - Smoke detectors - Google Patents

Smoke detectors

Info

Publication number
GB1379535A
GB1379535A GB3046473A GB3046473A GB1379535A GB 1379535 A GB1379535 A GB 1379535A GB 3046473 A GB3046473 A GB 3046473A GB 3046473 A GB3046473 A GB 3046473A GB 1379535 A GB1379535 A GB 1379535A
Authority
GB
United Kingdom
Prior art keywords
june
plastics material
conductive plastics
smoke
smoke detectors
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
GB3046473A
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.)
Anglo American Corp of South Africa Ltd
Original Assignee
Anglo American Corp of South Africa 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 ZA724440A external-priority patent/ZA724440B/en
Application filed by Anglo American Corp of South Africa Ltd filed Critical Anglo American Corp of South Africa Ltd
Publication of GB1379535A publication Critical patent/GB1379535A/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
    • G08B17/10—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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
    • G01N27/64—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using wave or particle radiation to ionise a gas, e.g. in an ionisation chamber
    • G01N27/66—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using wave or particle radiation to ionise a gas, e.g. in an ionisation chamber and measuring current or voltage

Landscapes

  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Emergency Management (AREA)
  • Toxicology (AREA)
  • Business, Economics & Management (AREA)
  • Electrochemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)

Abstract

1379535 lonization detectors ANGLO AMERICAN CORP OF SOUTH AFRICA Ltd 27 June 1973 [27 June 1972 15 Nov 1972] 30464/73 Heading H1D In a smoke detector of the ionization type comprising a smoke chamber 36 and a reference chamber 18 each containing a grid electrode 38, 32, the sections 20, 22 and the housing 34 are made of conductive plastics material which provides electrostatic shielding yet is resistant to corrosion. Such a material can contain carbon black as metal dopes to give a resistivity of about 10<SP>-4</SP> ohms /cc. The grid electrodes 32, 38 can also be made of conductive plastics material.
GB3046473A 1972-06-27 1973-06-27 Smoke detectors Expired GB1379535A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA724440A ZA724440B (en) 1972-06-27 1972-06-27 Smoke detectors
ZA728084 1972-11-15

Publications (1)

Publication Number Publication Date
GB1379535A true GB1379535A (en) 1975-01-02

Family

ID=27131055

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3046473A Expired GB1379535A (en) 1972-06-27 1973-06-27 Smoke detectors

Country Status (8)

Country Link
US (1) US3824422A (en)
JP (1) JPS4953494A (en)
AU (1) AU475495B2 (en)
CA (1) CA990865A (en)
CH (1) CH566060A5 (en)
DE (1) DE2332424C3 (en)
FR (1) FR2191731A5 (en)
GB (1) GB1379535A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA734995B (en) * 1973-07-23 1974-10-30 Anglo Amer Corp South Africa Improvemente in or relating to fire detectors
JPS5552558Y2 (en) * 1975-02-10 1980-12-05
JPS633253A (en) * 1986-06-24 1988-01-08 Nemoto Tokushu Kagaku Kk Aerosol concentration measuring instrument
JP2536630Y2 (en) * 1989-02-20 1997-05-21 能美防災 株式会社 Photoelectric smoke detector
US6040523A (en) * 1996-12-11 2000-03-21 Raytheon Company Snap-fit design of an airborne missile systems seeker/detector section using engineering plastics
US6057774A (en) * 1999-01-21 2000-05-02 Brk Brands, Inc. Smoke alarm with anti-dust screen
DE102008032145B4 (en) * 2008-07-08 2012-12-06 Techem Energy Services Gmbh Alarm device with a detection chamber open to the environment

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3769917A (en) * 1971-12-20 1973-11-06 Pullman Inc Freight bracing apparatus

Also Published As

Publication number Publication date
AU5736473A (en) 1975-01-09
DE2332424B2 (en) 1977-10-27
DE2332424A1 (en) 1974-01-31
CA990865A (en) 1976-06-08
FR2191731A5 (en) 1974-02-01
CH566060A5 (en) 1975-08-29
JPS4953494A (en) 1974-05-24
AU475495B2 (en) 1976-08-26
US3824422A (en) 1974-07-16
DE2332424C3 (en) 1978-06-22

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19920627