EP0233294B1 - Frame assembly of a photoelectric smoke sensor - Google Patents

Frame assembly of a photoelectric smoke sensor Download PDF

Info

Publication number
EP0233294B1
EP0233294B1 EP86904401A EP86904401A EP0233294B1 EP 0233294 B1 EP0233294 B1 EP 0233294B1 EP 86904401 A EP86904401 A EP 86904401A EP 86904401 A EP86904401 A EP 86904401A EP 0233294 B1 EP0233294 B1 EP 0233294B1
Authority
EP
European Patent Office
Prior art keywords
frame
shield plate
base
smoke sensor
light
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 - Lifetime
Application number
EP86904401A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0233294A4 (en
EP0233294A1 (en
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
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 filed Critical Nohmi Bosai Ltd
Publication of EP0233294A1 publication Critical patent/EP0233294A1/en
Publication of EP0233294A4 publication Critical patent/EP0233294A4/en
Application granted granted Critical
Publication of EP0233294B1 publication Critical patent/EP0233294B1/en
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 photocell-type smoke sensor, and more particularly to a frame assembly for a photocell-type smoke sensor wherein a frame provided with a light emitting part and a light receiving part is secured to a base through a shield plate.
  • 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 larger than the frame there exists a portion which is not covered by the frame and could reflect the light beam. Therefore, in order to prevent such reflection a dark paint for absorbing light must be applied to the shield plate, so that the time for the assembly process is further increased.
  • this object is attained in that a frame assembly is provided in which the frame is dimensioned to wholly cover the shield plate, and a pair of elastically deformable engaging members are formed on the base or on the frame, each member having a hook portion to engage in a corresponding hole in the frame or in the base respectively to firmly secure the frame, the base and the shield plate together.
  • the shield plate is put on the base.
  • the engaging members pass through the corresponding holes and the hook portions formed on the engaging members preferably engage stepped portions formed around the peripheries of the holes so that the frame is securely fixed to the base with the shield plate lying therebetween, and at the same time the whole of the shield plate is covered by the frame.
  • Fig. 1 indicates a photocell-type smoke sensor 1 of the light-scattering type.
  • a base 2 of the sensor has an integral shield case 3 and printed circuit board 4.
  • base 2 is provided with receiving portions 5 for receiving the terminals of a light emitting element and a light receiving element, a pair of holes 7 for engaging and holding elastic hook portions of a dark box 6, the holes 7 being oppositely disposed diametrically, and a pair of elastic engaging members 8 similarly oppositely disposed diametrically.
  • These engaging members 8 are elastically deformable and have hook portions 9 formed at their ends each projecting radially inwards.
  • a frame 11 is secured to the base 2 with a shield plate 10 lying therebetween.
  • the shield plate 10 is, as shown in Fig. 3, made of a circular metallic plate having a diameter d, and 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 light emitting part 14 and a light receiving part 15 provided on the frame 11, respectively.
  • the frame 11 is, as shown in Figs. 1 and 4, of a circular disk configuration having the same diameter d as the shield plate 10 to wholly cover it, and is provided at its lower surface with the light emitting part 14 and the light receiving part 15, a pair of holes 16 being adapted to receive the engaging members 8 formed on the base 2 and to pass them therethrough.
  • the optical axes of the light emitting part 14 and the light receiving part 15 are inclined and intersect at a predetermined angle.
  • stepped portions 17 On the radially inward edges of the holes 16 for the engaging members 8 are formed stepped portions 17 to engage the corresponding hook portions 9 of the engaging members 8.
  • the black box 6 comprises a protecting cover 18, an insect screen 19 and a labyrinth 20, and its inner space is in communication with the outer atmosphere.
  • the reference numeral 21 indicates a monitoring space, 22 a lens mounted in front of the light emitting element 14, and 23 a ceiling to which the smoke sensor 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 on the base 2 through the holes 16 formed in the frame 11.
  • the hook portions 9 of the engaging members 8 of the base 2 are therefore elastically urged radially outwards by the inner peripheries of the holes 16 for the engaging members 8, and upon passing through the holes 16 the hook portions 9 project over the surface of the frame 11 and abut the stepped portions 17 owing to their elasticity, thus firmly pressing and securing the frame 11 to the base 2.
  • 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 described above and illustrated.
  • the elastically deformable hook portions 9 may be provided on the frame 11 whereas the holes 16 with stepped portions 17 may be formed in the base 2.
  • the frame can be secured to the base with the shield plate lying therebetween by merely putting the shield plate on the frame and urging them against the base. No screwing is required for the assembly. Therefore, contrary to the conventional smoke sensor of this kind the assembly 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. The elimination of the painting operation also increases the 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)
EP86904401A 1985-07-22 1986-07-22 Frame assembly of a photoelectric smoke sensor Expired - Lifetime EP0233294B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP1985111991U JPH0434442Y2 (nl) 1985-07-22 1985-07-22
JP111991/85 1985-07-22
PCT/JP1986/000388 WO1987000667A1 (en) 1985-07-22 1986-07-22 Frame assembly of a photoelectric smoke sensor

Publications (3)

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

Family

ID=14575204

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86904401A Expired - Lifetime EP0233294B1 (en) 1985-07-22 1986-07-22 Frame assembly of a photoelectric smoke sensor

Country Status (5)

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

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63163698A (ja) * 1986-12-26 1988-07-07 ホーチキ株式会社 散乱光式煙感知器
EP0569712B1 (en) * 1992-04-25 1998-03-04 Nohmi Bosai Ltd. Fire detector
ES2451915R1 (es) 2012-09-27 2014-06-02 Utc Fire & Security Americas Corporation, Inc. Sistema modular de detección de humo y procedimiento para montar un sistema de detección de humo

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2434178C2 (de) * 1974-07-16 1983-12-08 Matsushita Electric Works, Ltd., Kadoma, Osaka Rauchmeldegerät nach dem Lichtstreuprinzip
JPS54136981U (nl) * 1978-03-15 1979-09-22
DE2830532A1 (de) * 1978-07-12 1980-01-31 Eichenauer Fa Fritz Elektrischer heizkoerper fuer fluide medien
FR2454661A1 (fr) * 1979-04-20 1980-11-14 Hochiki Co Appareil de detection d'incendie a tetes detectrices interchangeables
JPS5721119U (nl) * 1980-07-03 1982-02-03
JPS5812316U (ja) * 1981-07-14 1983-01-26 村田　信夫 洋傘

Also Published As

Publication number Publication date
EP0233294A4 (en) 1989-03-16
DE3688131T2 (de) 1993-11-18
CA1294698C (en) 1992-01-21
EP0233294A1 (en) 1987-08-26
JPH0434442Y2 (nl) 1992-08-17
WO1987000667A1 (en) 1987-01-29
DE3688131D1 (de) 1993-04-29
JPS6220359U (nl) 1987-02-06

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