[go: up one dir, main page]

GB1434808A - Optical smoke detectors - Google Patents

Optical smoke detectors

Info

Publication number
GB1434808A
GB1434808A GB5268473A GB5268473A GB1434808A GB 1434808 A GB1434808 A GB 1434808A GB 5268473 A GB5268473 A GB 5268473A GB 5268473 A GB5268473 A GB 5268473A GB 1434808 A GB1434808 A GB 1434808A
Authority
GB
United Kingdom
Prior art keywords
cover
circuit board
side wall
passage
wall
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
GB5268473A
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.)
ELECTRO SINGAL LAB Inc
Original Assignee
ELECTRO SINGAL LAB Inc
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 ELECTRO SINGAL LAB Inc filed Critical ELECTRO SINGAL LAB Inc
Publication of GB1434808A publication Critical patent/GB1434808A/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
    • G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
    • G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

1434808 Optical smoke detector ELECTRO SIGNAL LAB Inc 13 Nov 1973 [24 July 1973] 52684/73 Heading G1A An optical smoke detector comprises a base 1 with bottom wall and side wall 3, an optical block assembly 4, supporting lamp 13 and photo-cell 14 with a passage 27, and a passage formed from half passages 29 and (32), Fig. 6 (not shown), along axes A 1 and A 2 to openings in inner side wall 24 and a circuit board 7 slidingly received by guides 48 thus positioning wall 24 opposite wall 3, having ports 44, 46 to define dark chamber 5 whose enclosure is completed by two part cover 8, 9, having an entrance for smoke through opening 64 fitting over block 4 and side wall 3. A single screw through boss 61 secures block assembly 4 and the cover 8, 9 to the base, positioning being determined by depending lips 57. Light pipe 78 extends through holes to the surface of cover 8, 9 to show if the lamp is working. The block assembly 4 has two symmetrical portions, components being held in opposed recesses when the portions are mated by two registering pins and holes. Photocell 16 has at least one diffuser disc 37 and pin hole apertured disc 38 in passage 34. Inner cover 8 with an opening 64, which can be used to introduce a known intensity of light into dark chamber 5, mates with outer cover 9 having curved vanes 68. Circuit board 7 having components of an alarm circuit is secured by inner cover 8. Opposed grooves above and below inner side 24 of the block carry a flexible strip of blackened paper which may be slid over the openings of passages 27, 29 and 32. The decorative housing is formed by an enclosing ring 11 and face plate 12, which has snap fitting spring detents 71, engaging the cover through keyholes (73 in outer cover 9), and 74 engaging terminals 45 mechanically and electrically to supply A.C. to the alarm circuit. Heated resistors 52 cause thermal convection. Circuit board end 49 and baffle 51 form a funnel converging towards zone Z. The main parts are made of moulded plastic.
GB5268473A 1973-07-24 1973-11-13 Optical smoke detectors Expired GB1434808A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US382058A US3863076A (en) 1973-07-24 1973-07-24 Optical smoke detector

Publications (1)

Publication Number Publication Date
GB1434808A true GB1434808A (en) 1976-05-05

Family

ID=23507370

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5268473A Expired GB1434808A (en) 1973-07-24 1973-11-13 Optical smoke detectors

Country Status (7)

Country Link
US (1) US3863076A (en)
JP (1) JPS5034872A (en)
CA (1) CA1022644A (en)
DE (1) DE2358706A1 (en)
FR (1) FR2239169A5 (en)
GB (1) GB1434808A (en)
IT (1) IT1000987B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2000282A (en) * 1977-06-27 1979-01-04 Nittan Co Ltd Light scattering smoke detector
GB2137338A (en) * 1983-03-31 1984-10-03 Hochiki Co Scattered light type smoke detector

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3985453A (en) * 1974-07-19 1976-10-12 Matsushita Electric Works, Ltd. Light scattering type smoke detector
JPS5229274A (en) * 1975-08-29 1977-03-04 Matsushita Electric Works Ltd Light scattering type smoke detector
US4053785A (en) * 1976-01-07 1977-10-11 General Signal Corporation Optical smoke detector with smoke effect simulating means
US4124298A (en) * 1977-03-14 1978-11-07 Electro Signal Lab, Inc. Optical smoke detector inlet screen
US4249082A (en) * 1977-09-20 1981-02-03 Cybernet Electronics Corporation Photoelectric smoke sensor box
JPS59182337A (en) * 1983-03-31 1984-10-17 Matsushita Electric Works Ltd Smoke detector
USD283407S (en) 1984-03-09 1986-04-15 Pittway Corporation Smoke detector
USD284272S (en) 1984-08-09 1986-06-17 Laurence Chen Ionization chamber for a smoke detector
JPS63163698A (en) * 1986-12-26 1988-07-07 ホーチキ株式会社 Scattered light type smoke sensor
US4904988A (en) * 1989-03-06 1990-02-27 Nesbit Charles E Toy with a smoke detector
NO312911B1 (en) 1994-12-22 2002-07-15 Budenheim Rud A Oetker Chemie Anti-corrosion pigment and its use
JP2010271894A (en) * 2009-05-21 2010-12-02 Panasonic Electric Works Co Ltd Smoke detecting alarm
JP2013506922A (en) * 2009-10-05 2013-02-28 カビウス エーピーエス Fire alarm
EP2752828A4 (en) * 2011-08-29 2015-06-03 Fenwal Controls Japan Ltd PHOTOELECTRIC SMOKE DETECTOR
USD770929S1 (en) * 2014-06-26 2016-11-08 Life Safety Distribution Ag Optical block
DE102014019172B4 (en) 2014-12-17 2023-12-07 Elmos Semiconductor Se Device and method for distinguishing between solid objects, cooking fumes and smoke using a compensating optical measuring system
DE102014019773B4 (en) 2014-12-17 2023-12-07 Elmos Semiconductor Se Device and method for distinguishing between solid objects, cooking fumes and smoke using the display of a mobile telephone

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2537028A (en) * 1945-10-02 1951-01-09 C O Two Fire Equipment Co Smoke detector and signal
US2604597A (en) * 1949-02-03 1952-07-22 C O Two Fire Equipment Co Smoke detector
US3409885A (en) * 1964-03-26 1968-11-05 Guardian Industries Smoke detection apparatus
US3555532A (en) * 1968-10-29 1971-01-12 Graham Stuart Corp Vapor or particle detection device
DE2047997B2 (en) * 1970-09-30 1976-10-07 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt ELECTRONIC SINGLE ENTER KEY
US3723747A (en) * 1971-06-03 1973-03-27 Electro Signal Lab Photoelectric detector with compensating photocell

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2000282A (en) * 1977-06-27 1979-01-04 Nittan Co Ltd Light scattering smoke detector
GB2000282B (en) * 1977-06-27 1982-01-20 Nittan Co Ltd Improvements in or relating to a light scattering smoke detector
GB2137338A (en) * 1983-03-31 1984-10-03 Hochiki Co Scattered light type smoke detector

Also Published As

Publication number Publication date
DE2358706A1 (en) 1975-02-06
US3863076A (en) 1975-01-28
FR2239169A5 (en) 1975-02-21
CA1022644A (en) 1977-12-13
IT1000987B (en) 1976-04-10
JPS5034872A (en) 1975-04-03

Similar Documents

Publication Publication Date Title
GB1434808A (en) Optical smoke detectors
US3916209A (en) Vaned baffle for optical smoke detector
USD249475S (en) Electronic thermometer housing
ES420593A1 (en) Lighting fixture lens
GB1530816A (en) Light emitting diode indicator assembly for a multiple push-button array
DE69725950D1 (en) Optical safety device for cooking appliances
GB1252742A (en)
GB1505892A (en) Optoelectronic switch
ES229804U (en) Luminaire
USD264192S (en) Electronic test meter housing
USD264193S (en) Electronic test meter housing
GB1370811A (en) Apparatus for detecting suspended particulate matter within a chamber
GB1166580A (en) Multiple Flashing Light Unit
ATE11706T1 (en) LIGHT DIFFUSED SMOKE DETECTOR WITH SELF-MONITORING.
GB1528671A (en) Smoke detector
GB1346142A (en) Photoelectric punched card reading device
BR9105790A (en) INDICATION PROVISION FOR INDICATING STATES OF OPERATION
US3058389A (en) Photometers
FR2277475A1 (en) Telephone unit for wall or table mounting - has three interconnected units which are interchangeable
ES8206851A1 (en) Photographic densitometer
JPS6448010A (en) Photosemiconductor module
EP0280486A3 (en) Waterproof electrical connector assembly
GB1467592A (en) Ionization fire alarm
JPS6474586A (en) Electrooptical display device
BE904511A (en) NEW PUNCTUAL SMOKE OPTICAL DETECTOR.

Legal Events

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