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 scattered light type or a dimming type photoelectric smoke detector, and more particularly to a frame assembly of a photoelectric smoke detector.
• a scattered light type when the smoke enters the dark box, the light emitted from the light emitting unit is scattered by the smoke and enters the light receiving unit, and a light emitting unit is emitted when the smoke enters the dark box.
• a dimming type in which the light rays are blocked by smoke and do not enter the light receiving part.
• These sensors are provided with a frame having a light emitting part and a light receiving part, and a shield ⁇ for shielding external noise and the like. However, it is screwed to the base of the detector with the shield plate forming the upper surface of the dark box in between.
• the shield plate used as the top plate of the dark box is a metal plate for its function, but it is formed larger than the frame, so it is covered by the frame.
• the part that is not Exist, that part reflects light. So, this
• the present invention has been made in view of the circumstances described above, is simple, can be assembled quickly, and has a work process.
• a photoelectric type that can reduce and improve workability
• the present invention provides a light emitting unit and a light receiving unit.
• the base plate is sandwiched between the base and the frame, thereby holding the frame.
• the photoelectric smoke detector according to the present invention has such a configuration.
• the engaging piece of the base is used for the engaging piece opened to the frame.
• FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention
• FIG. 2 is a plan view showing a base of FIG. 1
• FIG. 5 is a plan view showing a shield plate of FIG.
• FIG. 4 is a plan view showing the frame of FIG.
• Fig. 1, 1 is a photoelectric smoke detector embodying the present invention, which is shown as being a scattered light smoke detector.
• Reference numeral 2 denotes a sensor base having a shield case 5 and a printed board 4 built therein. As shown in FIGS. 1 and 2, the base 2 has a light emitting element and a light receiving element.
• the storage part 5 that accommodates the terminal of the dark box and the key part of the dark box 6 are opposed in the radial direction to elastically engage and support the key part.
• a pair of engagement holes 7 and, similarly, a pair of elastic engagement pieces 8 opposed in the radial direction are provided.
• the frame 11 is attached to the base 2 via the shield plate 10, and this shield plate 10 is As shown in FIG. S, it is made up of a metal disk having a diameter d, and this shield plate 10 is formed on a base 2 as shown in FIGS. 1 and 5.
• the pair of engaging piece holes 12 for inserting the engaging pieces 8 and the protrusions of the light emitting section 14 and the light receiving section 15 provided in the frame 11 (FIG. 4) Each receiving hole 15 is provided for insertion.
• frame 11 is, as shown in Figs.
• the dark box ⁇ is made up of protective canopy 18, insect repellent net 19, and Labyrinth 20 power, and can be communicated with the outside air.
• reference numeral 21 denotes a smoke monitoring space
• 22 denotes a lens provided in front of the light emitting element
• 25 denotes a ceiling on which the photoelectric smoke detector 1 is mounted.
• a key portion 9 of the base 2 which is sexually deformed, and a frame for locking the key portion 9 are provided. instead of a first stage unit 1 7, full record a key portion elastically deforms
• the stepped portion occupying antidiarrheal engaging the hook portion of this may be provided on the base 2.
• the present invention has the above-described configuration, only by overlaying the shield plate and the frame and pushing them toward the base, The frame can be engaged and supported with the base plate sandwiched between the base plate and the base plate.
• the entire shield plate is covered with the frame, it is not necessary to apply a black paint for absorbing light as in the conventional case. Therefore, the painting process can be omitted, and the workability can be improved.

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)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=14575204

Family Applications (1)

Country Status (5)

Families Citing this family (5)

Citations (1)

Family Cites Families (5)

• 1985
  • 1985-07-22 JP JP1985111991U patent/JPH0434442Y2/ja not_active Expired
• 1986
  • 1986-07-22 EP EP86904401A patent/EP0233294B1/en not_active Expired - Lifetime
  • 1986-07-22 DE DE86904401T patent/DE3688131T2/de not_active Expired - Fee Related
  • 1986-07-22 WO PCT/JP1986/000388 patent/WO1987000667A1/ja active IP Right Grant
  • 1986-07-22 CA CA000514413A patent/CA1294698C/en not_active Expired - Lifetime

Patent Citations (1)

Non-Patent Citations (1)

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