EP0233294A1 - Assemblage de cadre d'un detecteur photo-electrique de fumee - Google Patents

Assemblage de cadre d'un detecteur photo-electrique de fumee Download PDF

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Publication number
EP0233294A1
EP0233294A1 EP86904401A EP86904401A EP0233294A1 EP 0233294 A1 EP0233294 A1 EP 0233294A1 EP 86904401 A EP86904401 A EP 86904401A EP 86904401 A EP86904401 A EP 86904401A EP 0233294 A1 EP0233294 A1 EP 0233294A1
Authority
EP
European Patent Office
Prior art keywords
frame
base
shield plate
engaging members
holes
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.)
Granted
Application number
EP86904401A
Other languages
German (de)
English (en)
Other versions
EP0233294A4 (fr
EP0233294B1 (fr
Inventor
Etuichi Nohmi Bosai Kogyo Kabushiki Kaisha Ohwasi
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.)
Nohmi Bosai Ltd
Original Assignee
Nohmi Bosai Ltd
Nohmi Bosai Kogyo Co 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
Application filed by Nohmi Bosai Ltd, Nohmi Bosai Kogyo Co Ltd filed Critical Nohmi Bosai Ltd
Publication of EP0233294A1 publication Critical patent/EP0233294A1/fr
Publication of EP0233294A4 publication Critical patent/EP0233294A4/fr
Application granted granted Critical
Publication of EP0233294B1 publication Critical patent/EP0233294B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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

Definitions

  • the present invention relates to a light-scattering or light-reducing type photcell-type smoke detector, and more particularly to a frame assembly for a photocell-type smoke detector.
  • a photocell-type smoke detector there are two types, i.e. a light-scattering-type in which smoke entering a dark box scatters a light beam from a luminescent part so that light reaches the light receiving part, and the other is a light-reducing type in which smoke entering the dark box shields the light beam from the luminescent part so that the light beam cannot reach the light receiving part.
  • a frame having a luminescent part and a light receiving part, and a shield plate to shield from outside noise, the frame being screwed to the base of the detector with the shield plate which forms the upper surface of the dark box intervening therebetween.
  • the frame and the shield plate are secured to the base by means of screws assembly is troublesome and it takes a long time, reducing productivity.
  • the shield plate used as an upper surface of the dark box is made of a metallic plate taking account of its function, and since it is formed so as to have a larger dimension than the frame there exists a portion that is not covered by the frame, this portion reflecting the light beam. Therefore, in order to prevent such reflection a dark paint for abosrbing light must be applied to the shield plate, so time for the assembly process is further increased.
  • a photocell-type smoke detector in which a frame having a luminescent part and a light. receiving part is secured to the base of the detector with a shield plate being intervened therebetween a-frame assembly is provided in which the frame is dimensioned to cover the whole of the surface of the shield plate, and the engaging holes are formed therein in order for elastic engaging members previously formed on the base to pass therethrough, hook portions formed on the elastic engaging members being adapted to engage the stepped portions formed at the peripheries of the engaging holes in the frame so that the frame can be firmly secured to the base with the shield plate intervening between the base and the frame.
  • the frame assembly for a photocell-type smoke detector in accordance with the present invention has such a constitution as stated above, on assembly, after the shield plate is put on the base, when the frame is put on the shield plate the engaging members of the base pass through the holes for the engaging members formed in the frame, the hook portions formed on the engaging members engage the stepped portions formed around the peripheries of the holes so that the frame is securely fixed to the base with the shield plate intervening therebetween, and at the same time the whole of the shield plate is covered by the frame.
  • Fig. 1 of the drawings wherein the reference numeral 1 indicates a photocell-type smoke detector embodying the present invention, the detector illustrated being a light-scattering type.
  • Numeral 2 is a base of the detector which has an integral shield case 3 and printed circuit board 4.
  • the base 2 is, as shown in Figs. 1 and 2, provided with reveiving portions 5 for receiving the terminals of a luminescent element and a light receiving element, a pair of engaging holes 7 for elastically engaging and holding the hook portions of a dark box 6, the holes 7 being oppositely disposed radially, and a pair of elastic engaging members 8 similarly oppositely disposed radially.
  • These engaging members 8 are elastically deformable and have hook portions 9 formed at their end portions, respectively, each projecting radially inwards.
  • a frame 11 is secured to the base 2 with a shield plate 10 intervening therebetween.
  • the shield plate 10 is, as shown in Fig. 3, made of a circular metallic plate having a diameter d, and this shield plate 10 is, as shown in Figs. 1 and 3, formed with a pair of holes 12 for introducing the engaging members 8 formed on the base 2, and receiving holes 13 for inserting the projecting portions of a luminescent part 14 and a light receiving part 15 provided on the frame 11, respectively.
  • the frame 11 is, as shown in Figs.
  • the optical axes of the luminescent part 14 and the light receiving part 15 are inclined so as to intersect at a predetermined angle.
  • the black box 6 comprises, as shown in Fig. 1, a protect cover 18, an insect screen19, and a labyrinth 20, and it is in communication with the atmosphere.
  • the reference numeral 21 indicates a monitoring space, 22 a lens mounted in front of the luminescent element, and 23 a ceiling to which the smoke detector 1 is mounted.
  • the shield plate 10 is put on the base 2 and. the engaging members 8 of the base 2 are introduced into the holes 12 formed in the shield plate 10. Thereafter the frame 11 is placed on the shield plate 10 by passing the engaging members 8 formed in the base 2 through the holes 16 formed in the frame 11 respectively.
  • the hook portions 9 of the engaging members 8 of the base 2 are therefore elastically radially urged outwards by the inner peripheries of the holes 16 for the engaging members 8, respectively, and upon passing through the holes 16, the hook portions 9 project over the surface of the frame 11, and the hook portions 9 abut the stepped portions 17 owing to their elastic, thus firmly pressing and securing the frame 11 to the base 2 by the engagement of the engaging members 8 with the stepped portions 17 of the frame 11.
  • the shield plate 10 is interposed between the frame 11 and the base 2, and the whole surface of the shield plate 10 is covered by the frame 11.
  • the present invention is not limited to the embodiment descrobed abpve and illustrated.
  • the elastically deformable hook portions 9 of the base 2 and the stepped portions 17 formed around the holes 16 of the frame 11 to be engaged by them may instead be provided on the frame 11 and on the base 2, respectively.
  • the frame can be secured to the base with the shield plate intervening therebetween by merely putting the shield plate on the frame and urging them against the base. Therefore, since in accordance with the present invention no screwing is required for assembly contrary to the conventional smoke detector of this kind the asembly can be done simply and rapidly, remarkably improving the productivity. Further, since the frame entirely covers the surface of the shield plate the plate need not be darkly coloured to absorb light contrary to the conventional smoke detectors of this kind, such painting operation being eliminated to thereby increases productivity.

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)

Abstract

Assemblage de cadre dans lequel un cadre (11) est assez grand pour couvrir la totalité de la plaque de protection (10), et le cadre (11) s'engage dans une plaque de base (2) et est supporté par celle-ci via la plaque de protection (10), afin de permettre l'assemblage simple et rapide d'un détecteur photo-électrique de fumée dans lequel le cadre (11) possédant une unité photo-émettrice (14) et une unité photo-réceptrice (15) est fixé sur la plaque de base (2) par l'intermédiaire de la plaque de protection (10).
EP86904401A 1985-07-22 1986-07-22 Assemblage de cadre d'un detecteur photo-electrique de fumee Expired - Lifetime EP0233294B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP111991/85 1985-07-22
JP1985111991U JPH0434442Y2 (fr) 1985-07-22 1985-07-22
PCT/JP1986/000388 WO1987000667A1 (fr) 1985-07-22 1986-07-22 Assemblage de cadre d'un detecteur photo-electrique de fumee

Publications (3)

Publication Number Publication Date
EP0233294A1 true EP0233294A1 (fr) 1987-08-26
EP0233294A4 EP0233294A4 (fr) 1989-03-16
EP0233294B1 EP0233294B1 (fr) 1993-03-24

Family

ID=14575204

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86904401A Expired - Lifetime EP0233294B1 (fr) 1985-07-22 1986-07-22 Assemblage de cadre d'un detecteur photo-electrique de fumee

Country Status (5)

Country Link
EP (1) EP0233294B1 (fr)
JP (1) JPH0434442Y2 (fr)
CA (1) CA1294698C (fr)
DE (1) DE3688131T2 (fr)
WO (1) WO1987000667A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2199941A (en) * 1986-12-26 1988-07-20 Hochiki Co Scattered-light smoke detector
EP0569712A1 (fr) * 1992-04-25 1993-11-18 Nohmi Bosai Ltd. Détecteur de feu
US9970912B2 (en) 2012-09-27 2018-05-15 Utc Fire & Security Americas Corporation, Inc. Modular smoke detection system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2434178A1 (de) * 1974-07-16 1976-01-22 Matsushita Electric Works Ltd Rauchmeldegeraet nach dem lichtstreuprinzip
GB2027568A (en) * 1978-07-12 1980-02-20 Eichenauer F Electrical heating device for fluid media
FR2454661A1 (fr) * 1979-04-20 1980-11-14 Hochiki Co Appareil de detection d'incendie a tetes detectrices interchangeables

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54136981U (fr) * 1978-03-15 1979-09-22
JPS5721119U (fr) * 1980-07-03 1982-02-03
JPS5812316U (ja) * 1981-07-14 1983-01-26 村田　信夫 洋傘

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2434178A1 (de) * 1974-07-16 1976-01-22 Matsushita Electric Works Ltd Rauchmeldegeraet nach dem lichtstreuprinzip
GB2027568A (en) * 1978-07-12 1980-02-20 Eichenauer F Electrical heating device for fluid media
FR2454661A1 (fr) * 1979-04-20 1980-11-14 Hochiki Co Appareil de detection d'incendie a tetes detectrices interchangeables

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO8700667A1 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2199941A (en) * 1986-12-26 1988-07-20 Hochiki Co Scattered-light smoke detector
GB2199941B (en) * 1986-12-26 1990-12-12 Hochiki Co Scattered-light smoke detector
AT404303B (de) * 1986-12-26 1998-10-27 Hochiki Co Streulicht-rauchmelder
EP0569712A1 (fr) * 1992-04-25 1993-11-18 Nohmi Bosai Ltd. Détecteur de feu
US5486816A (en) * 1992-04-25 1996-01-23 Nohmi Bosai Ltd. Fire detector having optic base clamping optic elements to a circuit board
US9970912B2 (en) 2012-09-27 2018-05-15 Utc Fire & Security Americas Corporation, Inc. Modular smoke detection system

Also Published As

Publication number Publication date
EP0233294A4 (fr) 1989-03-16
DE3688131D1 (de) 1993-04-29
EP0233294B1 (fr) 1993-03-24
CA1294698C (fr) 1992-01-21
WO1987000667A1 (fr) 1987-01-29
JPH0434442Y2 (fr) 1992-08-17
JPS6220359U (fr) 1987-02-06
DE3688131T2 (de) 1993-11-18

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