EP0296634B1 - Optical smoke detector in form of a cuboid - Google Patents

Optical smoke detector in form of a cuboid Download PDF

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Publication number
EP0296634B1
EP0296634B1 EP88110207A EP88110207A EP0296634B1 EP 0296634 B1 EP0296634 B1 EP 0296634B1 EP 88110207 A EP88110207 A EP 88110207A EP 88110207 A EP88110207 A EP 88110207A EP 0296634 B1 EP0296634 B1 EP 0296634B1
Authority
EP
European Patent Office
Prior art keywords
housing
smoke detector
circuit board
photocarrier
cap
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
EP88110207A
Other languages
German (de)
French (fr)
Other versions
EP0296634A3 (en
EP0296634A2 (en
Inventor
Werner Dipl.-Ing.(Fh) Keller
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to AT8888110207T priority Critical patent/ATE104783T1/en
Publication of EP0296634A2 publication Critical patent/EP0296634A2/en
Publication of EP0296634A3 publication Critical patent/EP0296634A3/en
Application granted granted Critical
Publication of EP0296634B1 publication Critical patent/EP0296634B1/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
    • 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

Definitions

  • the invention relates to a cuboid optical smoke detector with a housing part, housing cap and lower photo carrier, and with a printed circuit board, components, an upper photo carrier, labyrinth and detector cap, wherein the housing part and the lower photo carrier are designed as a one-piece housing, and that housing in Area of the photo elements is formed for the immediate inclusion of a transmitting and a receiving diode.
  • Optical smoke detectors are generally known. Fire protection doors that have an automatic closing device are triggered directly by fire alarms that are arranged in the area of the fire alarm door when the fire alarm has responded. For this purpose, automatic optical smoke detectors have already been made cuboid and mounted above the door with the locking device. Such optical smoke detectors are assembled from a large number of individual parts. This has the disadvantage that the production of the individual mechanical parts causes high costs, the assembly of the individual parts, the assembly of the detector is complex and therefore expensive.
  • GB-A-1 581 495 describes an optical smoke detector which already has fewer individual parts.
  • the cuboid housing has a base part and an upper part, the lower housing part and the lower photo carrier being formed in one piece, and the base part being formed in the region of the photo elements for the direct reception of a light source and a light receiver.
  • the object of the invention is to design an optical smoke detector as described above in such a way that it can be manufactured and assembled more easily and cost-effectively, and can be installed more elegantly with the locking mechanism.
  • the housing part, the housing cap and the lower photo carrier are formed in one piece, the housing being shaped in the area of the photo elements for the immediate reception of a transmitting and a receiving diode.
  • the housing cap is trough-shaped in the area of the circuit board for components for receiving a potting compound.
  • a recess for at least one solderable adjustment resistor is provided in the housing cap on the outside of the trough-shaped area, which cannot be reached by the sealing compound.
  • the smoke detector according to the invention has the advantage over the previous smoke detector, which consisted of three or two different molded parts, that only a single molded part forms the entire housing. Due to the structural design of the housing for the smoke detector, a holder for the transmitting and receiving diodes and the circuit board with the components is provided at the same time. In addition, with the trough-shaped design of the housing in the area of the printed circuit boards, a potting trough for fully potting the entire printed circuit board assembly is formed. The arrangement of the printed circuit board assembly that is possible in this way allows the assembly with discrete components and in SMD technology.
  • a fastening flange is formed on the narrow side of the housing on the outside, so that the entire detector can be very easily attached to the mounting plate at the place of use.
  • the cuboid optical smoke detector has the specially designed housing 10, which is fastened with its two fastening flanges 14 to the mounting plate 15 with screws.
  • the circuit board 13 with the components is arranged, which has discrete components 16 and 17 using SMD technology.
  • the connections for the photo elements are made through the housing 10 there.
  • the housing 10 is simultaneously designed as a lower photo carrier in accordance with the photo elements.
  • the light-emitting diode 18 is also fastened to the printed circuit board 13 and inserted through the opening 24 in the housing cap 6.
  • the potting compound 22 can penetrate into the conically shaped opening 24 during sealing and seal it tightly.
  • the electrical connections 8 are also guided into the housing for the printed circuit board and are sealed off after casting. 1 and 3, the recess 23 can be clearly seen, which is arranged in the housing cap 6 open to the outside. Lead wires lead from the circuit board 13 into this recess 23, so that at least one balancing resistor 19 can be soldered in after the circuit board has been inserted and cast. To the outside, the recess 23 is covered with the balancing resistor 19 by an affixed type plate 20, so that protection against corrosion is provided and the optical design is also improved.
  • the labyrinth 9, which simultaneously forms the photo cover, is arranged in the area of the photo elements.
  • the circuit board 13 with all the components 16, 17 is potted, which is represented by the upper edge of the potting compound 22.
  • the optical smoke detector is covered with a detector cap 21, which is shown in broken lines.
  • the smoke detector according to the invention allows the components to be encapsulated and represents a significant simplification and cost reduction due to the design described above.
  • the original three necessary different molded parts are formed by a single molded part, namely the housing 10.
  • the new design of the smoke detector housing thus fulfills several functions in the system structure, namely at the same time holder for transmitting (11) and receiving diodes (12), and thus forms the lower photo carrier, it is also a carrier for the circuit board 13 with the individual components and Potting trough for full potting 22 of the entire printed circuit board assembly.
  • the housing has molded-on mounting flanges 14 for mounting the entire detector on the mounting plate 15 at the place of use.

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  • 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

In the smoke detector according to the invention having a housing component, housing cover and lower photocarrier, as well as having a circuit board, components, an upper photocarrier, labyrinth and signalling cover, the housing component, the housing cover and the lower photocarrier are constructed as an integral housing (10), the housing (10) being formed in the region of the photoelements for the direct reception of a transmitting and/or receiving diode (11, 12) and being of trough-shaped construction in the region of the circuit board (13) for components (16, 17, 18) for the purpose of receiving a sealing compound (22). In the housing (10) a recess (23) for at least one balancing resistor (19), which can be soldered in, is provided on the outside of the trough-shaped area and cannot be reached by the sealing compound. In addition, in each case an outwardly pointing mounting flange (14) is formed on two opposite narrow sides of the housing (10). <IMAGE>

Description

Die Erfindung bezieht sich auf einen quaderförmigen optischen Rauchmelder mit einem Gehäuseteil, Gehäusekappe und unterem Fototräger, sowie mit einer Leiterplatte, Bauelementen, einem oberen Fototräger, Labyrinth und Melderkappe, wobei das Gehäuseteil und der untere Fototräger als einstückiges Gehäuse ausgebildet sind, und daß Gehäuse im Bereich der Fotoelemente für die unmittelbare Aufnahme einer Sende- und einer Empfangsdiode ausgeformt ist.The invention relates to a cuboid optical smoke detector with a housing part, housing cap and lower photo carrier, and with a printed circuit board, components, an upper photo carrier, labyrinth and detector cap, wherein the housing part and the lower photo carrier are designed as a one-piece housing, and that housing in Area of the photo elements is formed for the immediate inclusion of a transmitting and a receiving diode.

Optische Rauchmelder sind im allgemeinen bekannt. Feuerschutztüren, die eine automatische Schließvorrichtung aufweisen, werden unmittelbar von Feuermeldern, die im Bereich der Feuermeldetür angeordnet sind, ausgelöst, wenn der Feuermelder angesprochen hat. Für diesen Zweck wurden bereits automatische optische Rauchmelder quaderförmig ausgebildet und über der Türe mit der Schließvorrichtung montiert. Derartige optische Rauchmelder sind aus einer Vielzahl von Einzelteilen zusammengebaut. Das hat den Nachteil, daß die Herstellung der einzelnen mechanischen Teile hohe Kosten verursacht, der Zusammenbau der einzelnen Teile, die Montage des Melders aufwendig und daher kostenintensiv ist.Optical smoke detectors are generally known. Fire protection doors that have an automatic closing device are triggered directly by fire alarms that are arranged in the area of the fire alarm door when the fire alarm has responded. For this purpose, automatic optical smoke detectors have already been made cuboid and mounted above the door with the locking device. Such optical smoke detectors are assembled from a large number of individual parts. This has the disadvantage that the production of the individual mechanical parts causes high costs, the assembly of the individual parts, the assembly of the detector is complex and therefore expensive.

In der GB-A-1 581 495 ist ein optischer Rauchmelder beschrieben, der bereits weniger Einzelteile aufweist. Das quaderförmige Gehäuse besitzt ein Basisteil und ein Oberteil, wobei das untere Gehäuseteil und der untere Fototräger einstückig ausgebildet sind, und daß Basisteil im Bereich der Fotoelemente für die unmittelbare Aufnahme einer Lichtquelle und eines Lichtempfängers ausgeformt ist.GB-A-1 581 495 describes an optical smoke detector which already has fewer individual parts. The cuboid housing has a base part and an upper part, the lower housing part and the lower photo carrier being formed in one piece, and the base part being formed in the region of the photo elements for the direct reception of a light source and a light receiver.

Aufgabe der Erfindung ist es, einen oben beschriebenen optischen Rauchmelder derart auszubilden, daß er einfacher und kostengünstiger hergestellt und zusammengebaut, sowie eleganter mit dem Schließmechanismus montiert werden kann.The object of the invention is to design an optical smoke detector as described above in such a way that it can be manufactured and assembled more easily and cost-effectively, and can be installed more elegantly with the locking mechanism.

Diese Aufgabe wird erfindungsgemäß mit den Merkmalen des Anspruchs 1 gelöst. Das Gehäuseteil, die Gehäusekappe und der untere Fototräger sind einstückig ausgebildet, wobei das Gehäuse im Bereich der Fotoelemente für die unmittelbare Aufnahme einer Sende- und einer Empfangs-Diode ausgeformt ist. Die Gehäusekappe ist im Bereich der Leiterplatte für Bauelemente wannenförmig für die Aufnahme einer Vergußmasse ausgebildet. In der Gehäusekappe ist an der Außenseite des wannenförmigen Bereichs, von der Vergußmasse nicht erreichbar, eine Ausnehmung für zumindest einen einlötbaren Abgleichwiderstand vorgesehen.This object is achieved with the features of claim 1. The housing part, the housing cap and the lower photo carrier are formed in one piece, the housing being shaped in the area of the photo elements for the immediate reception of a transmitting and a receiving diode. The housing cap is trough-shaped in the area of the circuit board for components for receiving a potting compound. A recess for at least one solderable adjustment resistor is provided in the housing cap on the outside of the trough-shaped area, which cannot be reached by the sealing compound.

Der erfindungsgemäße Rauchmelder hat gegenüber dem bisherigen Rauchmelder, der aus drei bzw. zwei verschiedenen Spritzteilen bestand, den Vorteil, daß lediglich ein einzelnes Spritzteil das gesamte Gehäuse bildet. Aufgrund der konstruktiven Ausbildung des Gehäuses für den Rauchmelder ist gleichzeitig eine Halterung für die Sende- und Empfangsdioden sowie die Leiterplatte mit den Bauelementen gegeben. Zudem ist mit der wannenförmigen Ausbildung des Gehäuses im Bereich der Leiterplatten eine Vergußwanne zum Vollverguß der gesamten Leiterplatten-Baugruppe gebildet. Die hierdurch mögliche Anordnung der Leiterplatten-Baugruppe erlaubt den Aufbau mit diskreten Bauelementen und in SMD-Technik.The smoke detector according to the invention has the advantage over the previous smoke detector, which consisted of three or two different molded parts, that only a single molded part forms the entire housing. Due to the structural design of the housing for the smoke detector, a holder for the transmitting and receiving diodes and the circuit board with the components is provided at the same time. In addition, with the trough-shaped design of the housing in the area of the printed circuit boards, a potting trough for fully potting the entire printed circuit board assembly is formed. The arrangement of the printed circuit board assembly that is possible in this way allows the assembly with discrete components and in SMD technology.

In einer weiteren vorteilhaften Ausgestaltung der Erfindung ist jeweils an der Schmalseite des Gehäuses auf der Außenseite ein Befestigungsflansch angeformt, so daß sehr einfach der gesamte Melder auf der Montageplatte am Einsatzort befestigt werden kann.In a further advantageous embodiment of the invention, a fastening flange is formed on the narrow side of the housing on the outside, so that the entire detector can be very easily attached to the mounting plate at the place of use.

Eine weitere zweckmäßige Ausbildung des optischen Rauchmelders ist dadurch gegeben, daß im wannenförmigen Bereich eine Öffnung für eine Leuchtdiode vorgesehen ist, die entsprechend auf der Leiterplatte angeordnet ist. Beim Montieren der Leiterplatte ragt die Leuchtdiode durch den Bereich des Gehäuses nach außen, wobei die Öffnung zur Gehäuseinnenseite konisch verbreitert ist, so daß sich einerseits die Diode gut durchstecken läßt und andererseits beim Vergießen des Leiterplatten-Baugruppenträgers diese Öffnung sich mit der Vergußmasse schließt und der Leuchtdiode einen festen und dichten Halt im Gehäuse gibt. Weitere Einzelheiten und Vorteile der Erfindung ergeben sich aus der kurzen Beschreibung des Rauchmelders anhand einer Zeichnung. Dabei zeigen die

  • FIG 1 den Rauchmelder in Draufsicht, teilweise aufgerissen dargestellt,
  • FIG 2 einen Schnitt II-II gemäß FIG 1 in Seitenansicht und
  • FIG 3 einen weiteren Schnitt III-III gemäß der FIG 2.
A further expedient design of the optical smoke detector is given by the fact that an opening for a light-emitting diode is provided in the trough-shaped area and is arranged accordingly on the printed circuit board. When assembling the circuit board, the light-emitting diode protrudes through the area of the housing to the outside, the opening to the inside of the housing being widened conically, so that on the one hand the diode can be pushed through well and on the other hand, when the circuit board subrack is cast, this opening closes with the sealing compound and the LED gives a firm and tight hold in the housing. Further details and advantages of the invention result from the brief description of the smoke detector with reference to a drawing. The show
  • 1 shows the smoke detector in a top view, partially torn open,
  • 2 shows a section II-II according to FIG 1 in side view and
  • 3 shows a further section III-III according to FIG. 2.

Der quaderförmige optische Rauchmelder weist das besonders ausgebildete Gehäuse 10 auf, welches mit seinen beiden Befestigungsflanschen 14 auf der Montageplatte 15 mit Schrauben befestigt ist. In dem wannenförmigen Bereich des Gehäuses 10 bzw. in der Gehäusekappe 6 ist die Leiterplatte 13 mit den Bauelementen angeordnet, die diskrete Bauteile 16 und in SMD-Technik 17 aufweist. Ebenso sind dort die Anschlüsse für die Fotoelemente, wie die Sendediode 11 und Empfangsdiode 12, durch das Gehäuse 10 durchgeführt. In diesem Bereich ist das Gehäuse 10 entsprechend der Fotoelemente gleichzeitig als unterer Fototräger ausgebildet. Die Leuchtdiode 18 ist ebenfalls auf der Leiterplatte 13 befestigt und durch die Öffnung 24 in der Gehäusekappe 6 gesteckt. In die konisch ausgebildete Öffnung 24 kann die Vergußmasse 22 beim Vergießen eindringen und diese dicht abschließen. Die elektrischen Anschlüsse 8 sind ebenfalls in das Gehäuse zur Leiterplatte geführt und nach dem Vergießen dicht abgeschlossen. In der FIG 1 und 3 ist die Ausnehmung 23 gut zu erkennen, die in der Gehäusekappe 6 zur Außenseite hin offen angeordnet ist. Von der Leiterplatte 13 führen Anschlußdrähte in diese Ausnehmung 23, so daß nach dem Einbringen und Vergießen der Leiterplatte zumindest ein Abgleichwiderstand 19 eingelötet werden kann. Nach außen hin wird die Ausnehmung 23 mit dem Abgleichwiderstand 19 durch ein aufgeklebtes Typenschild 20 verdeckt, so daß ein Schutz vor Korrosion gegeben und darüber hinaus das optische Design verbessert ist. Im Bereich der Fotoelemente ist das Labyrinth 9, welches gleichzeitig die Fotoabdeckung bildet, angeordnet. Die Leiterplatte 13 mit sämtlichen Bauteilen 16, 17 ist vergossen, was durch die Oberkante der Vergußmasse 22 dargestellt ist. Der optische Rauchmelder ist mit einer Melderkappe 21, die gestrichelt dargestellt ist, abgedeckt.The cuboid optical smoke detector has the specially designed housing 10, which is fastened with its two fastening flanges 14 to the mounting plate 15 with screws. In the trough-shaped region of the housing 10 or in the housing cap 6, the circuit board 13 with the components is arranged, which has discrete components 16 and 17 using SMD technology. Likewise, the connections for the photo elements, such as the transmitter diode 11 and receiver diode 12, are made through the housing 10 there. In this area, the housing 10 is simultaneously designed as a lower photo carrier in accordance with the photo elements. The light-emitting diode 18 is also fastened to the printed circuit board 13 and inserted through the opening 24 in the housing cap 6. The potting compound 22 can penetrate into the conically shaped opening 24 during sealing and seal it tightly. The electrical connections 8 are also guided into the housing for the printed circuit board and are sealed off after casting. 1 and 3, the recess 23 can be clearly seen, which is arranged in the housing cap 6 open to the outside. Lead wires lead from the circuit board 13 into this recess 23, so that at least one balancing resistor 19 can be soldered in after the circuit board has been inserted and cast. To the outside, the recess 23 is covered with the balancing resistor 19 by an affixed type plate 20, so that protection against corrosion is provided and the optical design is also improved. The labyrinth 9, which simultaneously forms the photo cover, is arranged in the area of the photo elements. The circuit board 13 with all the components 16, 17 is potted, which is represented by the upper edge of the potting compound 22. The optical smoke detector is covered with a detector cap 21, which is shown in broken lines.

Der erfindungsgemäße Rauchmelder erlaubt den Verguß der Bauelemente und stellt eine wesentliche Vereinfachung und Kostensenkung aufgrund der oben geschilderten Ausgestaltung dar. Dabei ist, wie schon erläutert, von Vorteil, daß die ursprünglich drei notwendigen verschiedenen Spritzteile durch ein einziges Spritzteil, nämlich dem Gehäuse 10, gebildet sind. Dies führt zu wesentlichen Einsparungen hinsichtlich von Werkzeug und Teilekosten, sowie Lagerhaltung, Disposition und Montagekosten. Die neue konstruktive Ausbildung des Rauchmelder-Gehäuses erfüllt somit mehrere Funktionen im Systemaufbau, nämlich gleichzeitig Halterung für Sende- (11) und Empfangsdioden (12), und bildet somit den unteren Fototräger, ferner ist es Träger für die Leiterplatte 13 mit den einzelnen Bauelementen sowie Vergußwanne zum Vollverguß 22 der gesamten Leiterplatten-Baugruppe. Darüber hinaus besitzt das Gehäuse angeformte Befestigungsflansche 14 für die Montage des gesamten Melders auf der Montageplatte 15 am Einsatzort.The smoke detector according to the invention allows the components to be encapsulated and represents a significant simplification and cost reduction due to the design described above. As already explained, it is advantageous that the original three necessary different molded parts are formed by a single molded part, namely the housing 10. This leads to significant savings in tool and part costs, as well as warehousing, disposition and assembly costs. The new design of the smoke detector housing thus fulfills several functions in the system structure, namely at the same time holder for transmitting (11) and receiving diodes (12), and thus forms the lower photo carrier, it is also a carrier for the circuit board 13 with the individual components and Potting trough for full potting 22 of the entire printed circuit board assembly. In addition, the housing has molded-on mounting flanges 14 for mounting the entire detector on the mounting plate 15 at the place of use.

Claims (4)

  1. Cuboid optical smoke detector having a housing part, a housing cap (6) and lower photocarrier, and having a printed circuit board (13), components, an upper photocarrier (7), labyrinth (9) and detector cap (21), the housing part and the lower photocarrier being constructed as a single-piece housing (10) and the housing (10) being shaped in the region of the photoelements for directly accommodating a transmitting and a receiving diode (11, 12), characterized in that the housing cap (6) forms a unit with the housing (10) and is constructed in the region of the printed circuit board (13) for the components (16, 17, 18) in the shape of a trough for accommodating a casting compound (22), and in that a recess (23) for at least one solder-in trimming resistor (19) is provided in the housing cap (6) on the outside of the trough-shaped region, not reachable by the casting compound.
  2. Smoke detector according to Claim 1, characterized in that an outwardly pointing mounting flange (14) is integrally formed in each case on two opposite narrow sides of the housing (10).
  3. Smoke detector according to Claim 1, characterized in that the recess (23) can be covered by a rating plate (20).
  4. Smoke detector according to Claim 1, characterized in that an opening (24) for a light-emitting diode (18) arranged on the printed circuit board (13) is provided in the housing cap (6), the opening (24) being conically expanded towards the inside of the housing.
EP88110207A 1987-06-26 1988-06-27 Optical smoke detector in form of a cuboid Expired - Lifetime EP0296634B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT8888110207T ATE104783T1 (en) 1987-06-26 1988-06-27 CUBE-SHAPED OPTICAL SMOKE DETECTOR.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8708891U 1987-06-26
DE8708891U DE8708891U1 (en) 1987-06-26 1987-06-26 Cuboid-shaped optical smoke detector

Publications (3)

Publication Number Publication Date
EP0296634A2 EP0296634A2 (en) 1988-12-28
EP0296634A3 EP0296634A3 (en) 1991-01-23
EP0296634B1 true EP0296634B1 (en) 1994-04-20

Family

ID=6809479

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88110207A Expired - Lifetime EP0296634B1 (en) 1987-06-26 1988-06-27 Optical smoke detector in form of a cuboid

Country Status (3)

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EP (1) EP0296634B1 (en)
AT (1) ATE104783T1 (en)
DE (2) DE8708891U1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1315417B1 (en) * 2000-04-11 2003-02-10 Pittway Tecnologica Spa FIRE DETECTOR STRUCTURE
DE10322017B8 (en) * 2003-05-16 2005-02-24 Sitronic Gesellschaft für elektrotechnische Ausrüstung mbH. & Co. KG sensor unit

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3916209A (en) * 1973-07-24 1975-10-28 Electro Signal Lab Vaned baffle for optical smoke detector
US4053785A (en) * 1976-01-07 1977-10-11 General Signal Corporation Optical smoke detector with smoke effect simulating means
GB1581495A (en) * 1978-05-23 1980-12-17 Chloride Inc Smoke detector
JPS59182337A (en) * 1983-03-31 1984-10-17 Matsushita Electric Works Ltd Smoke detector

Also Published As

Publication number Publication date
EP0296634A3 (en) 1991-01-23
EP0296634A2 (en) 1988-12-28
DE8708891U1 (en) 1987-08-20
ATE104783T1 (en) 1994-05-15
DE3889153D1 (en) 1994-05-26

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