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EP1037184B1 - Casing for hazard warning device - Google Patents

Casing for hazard warning device Download PDF

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Publication number
EP1037184B1
EP1037184B1 EP99104593A EP99104593A EP1037184B1 EP 1037184 B1 EP1037184 B1 EP 1037184B1 EP 99104593 A EP99104593 A EP 99104593A EP 99104593 A EP99104593 A EP 99104593A EP 1037184 B1 EP1037184 B1 EP 1037184B1
Authority
EP
European Patent Office
Prior art keywords
cover
base
screw
detector
housing
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
EP99104593A
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German (de)
French (fr)
Other versions
EP1037184A1 (en
Inventor
Marco Meier
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 Building Technologies AG
Original Assignee
Siemens Building Technologies 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 Building Technologies AG filed Critical Siemens Building Technologies AG
Priority to DE59907541T priority Critical patent/DE59907541D1/en
Priority to EP99104593A priority patent/EP1037184B1/en
Priority to US09/511,836 priority patent/US6297745B1/en
Publication of EP1037184A1 publication Critical patent/EP1037184A1/en
Application granted granted Critical
Publication of EP1037184B1 publication Critical patent/EP1037184B1/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
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02—Monitoring continuously signalling or alarm systems
    • G08B29/04—Monitoring of the detection circuits
    • G08B29/046—Monitoring of the detection circuits prevention of tampering with detection circuits

Definitions

  • the present invention relates to a housing for a hazard detector, with a base, a detachably connectable to the bottom lid, the bottom for attachment to a Wall is provided, and with a sabotage detector to trigger an alarm when violent Removal of the alarm from the wall.
  • Hazard detectors especially intrusion detectors, are because of their high detection reliability often exposed to attempts at sabotage, from covering the detector to the latter Tear off the wall.
  • covering or masking the detector for example for passive infrared detectors by covering the detector with a cardboard box, hat or other suitable shielding or by spraying the detector's entry window for infrared radiation with an infrared-opaque medium are preferred opto-electronic means used in the form of an additional detection system.
  • Such Means are, for example, in EP-A-0 186 226, EP-A-0 189 536, EP-A-0 476 397 EP-A-0 499 177 or EP-A-0 772 171.
  • Another type of sabotage is to open the intrusion detector by unauthorized opening To cripple the cover.
  • a cover contact is used to detect this sabotage we open the lid. It is also possible to interlock the lid with the latch To couple bottom and lid, so that the actuation of the lock is already detected (see EP-A-0 616 307).
  • the means for triggering an alarm in the event of violent removal, such as tearing off the Detectors from the wall are in a known intrusion detector (type IR160 from Alarmcom AG, CH-8604 Volketswil) through a through which a fastening screw of the detector Field easily broken out of the ground and formed by a contact switch.
  • the latter is fixed on an unbreakable part of the floor and presses with it resilient contact against a projection of the break-out field.
  • the contact switch is removed from this field and the electrical contact is opened becomes. Since the detectors are designed for both wall and corner mounting At least two breakable fields are provided, the contact switch being on the field penetrated by the fastening screw.
  • this object is achieved in that the base has a strip-shaped, area surrounded by weak points with several screw-in points for a fastening screw contains, and that this strip-shaped region protrudes against the lid Has web, which with its free end when the housing is closed in the lid mounted contact switch closes.
  • the strip-shaped area with the several screw-in points has the advantage of being independent of which of the screw-in points contains the fastening screw when tearing off the
  • the entire strip-shaped area is broken out of the ground. This allows, that the contact switch for the different types of fastening only on one Place must be arranged.
  • Through the protruding web and the associated one Contact switch in the lid there is the advantage of having a single contact switch both opening the cover and tearing the detector off the wall can be detected. This means cost savings because there is no contact switch and also a not insignificant relief when installing the detector, because the Contact switch is installed in the factory and can no longer be used on site in the detector got to. This also eliminates any danger that the contact switch is at the wrong one Place in the detector.
  • a first preferred embodiment of the housing according to the invention is characterized in that that the strip-shaped area runs across the floor and screw-in points for different types of fastening of the hazard detector, such as wall and corner mounting, having.
  • a second preferred embodiment of the housing according to the invention is characterized in that that the cover contains a circuit board carrying the evaluation electronics, and that the contact switch is arranged on this circuit board.
  • the housing for a hazard detector in particular a passive infrared detector, consists of a bottom 1 and a cover 2 which can be releasably connected to it.
  • the connection between the bottom 1 and the cover 2, which is not the subject of the present patent application, is preferably a locking connection fixable with a screw.
  • the bottom 1 has at its lower transverse edge two slots 4 arranged in projections 3 on, which are arranged to accommodate corresponding, on the lower transverse edge of the lid 2 Noses (not shown) are provided.
  • the lid 2 is pushed into the slots 4 with the lugs, whereby it is from the bottom 1 by one Angle of about 30 ° is pivoted away.
  • the cover 2 is fixed in this position on the bottom 1 and is then folded against the floor, at the end of this movement in the area the upper transverse edge of the bottom 1 arranged resilient hook 5 in corresponding Snap in counterparts of cover 2.
  • the cover 2 is then screwed 6 fixed to a nose 7 lying between the hooks 5.
  • the head of screw 6 is in the lid 2 covered by a tab, so that the screw 6 for an observer without further examination the detector is not recognizable.
  • the bottom 1 contains at its upper end, just below the hook 5, a socket element 8 of an electrical connector and is in its lower, by a crosspiece 9th separated half, essentially empty.
  • the cover 2 contains a circuit board 10 which among other things, the evaluation electronics of the detector, an infrared sensor 11 and an infrared mirror 12 for bundling the through an infrared window 13 in the lid 2 on the Infrared mirror 12 carries infrared radiation on the infrared sensor 11.
  • the evaluation electronics of the detector an infrared sensor 11 and an infrared mirror 12 for bundling the through an infrared window 13 in the lid 2 on the Infrared mirror 12 carries infrared radiation on the infrared sensor 11.
  • the pin element As a counterpart to the socket element 8 14 of the electrical connector arranged, which when closing the housing in the socket element 8 is inserted, thereby making electrical contact with the power supply and possible data lines is established.
  • the power line and everyone else Lines are led through openings in the bottom 1 to the socket element 8.
  • the base 1 contains one of weak points (Predetermined breaking points) bordered transverse strips 15 with three screw-in points 16 for fastening screws and with a web 17 projecting towards the front against the cover 2 (see also also Figures 2 and 3).
  • the bottom 1 has at its longitudinal edges one inclined at 45 ° Bevel on; accordingly, the ends of the transverse strip 15 are opposite to it Middle section inclined 45 ° to the front.
  • Both the middle part and the two ends of the horizontal stripe 15 each contain a screw-in point 16, the screw-in point of the middle part at Wall mounting and the screwing in of the ends can be used for corner mounting.
  • the circuit board 10 carries a contact switch 19 on its side facing the bottom 1, whose contact tongue protrudes against the floor 1.
  • the contact switch 19 is on the circuit board 10 arranged so that it is immediately in front of the end edge of the web 17, and the web 17 dimensioned so that it closes the contact on switch 19 when the housing is closed. As soon as this contact is opened for any reason, the evaluation electronics generate one Sabo day signal, which indicates that the detector in question has been deactivated.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)

Description

Die vorliegende Erfindung betrifft ein Gehäuse für einen Gefahrenmelder, mit einem Boden, einem lösbar mit dem Boden verbindbaren Deckel, wobei der Boden zur Befestigung an einer Wand vorgesehen ist, und mit einem Sabotagedetektor zur Auslösung eines Alarms bei gewaltsamer Entfernung des Gefahrenmelders von der Wand.The present invention relates to a housing for a hazard detector, with a base, a detachably connectable to the bottom lid, the bottom for attachment to a Wall is provided, and with a sabotage detector to trigger an alarm when violent Removal of the alarm from the wall.

Gefahrenmelder, insbesondere Intrusionsmelder, sind wegen ihrer hohen Detektionszuverlässigkeit oft Sabotageversuchen ausgesetzt, welche vom Abdecken des Melders bis zu dessen Abreissen von der Wand reichen. Gegen das Abdecken oder Maskieren des Melders, das beispielsweise bei Passiv-Infrarotmelder durch Abdecken des Melders mit einem Karton, Hut oder einer anderen geeigneten Abschirmung oder durch Besprühen des Eintrittsfensters des Melders für die Infrarotstrahlung mit einem infrarotundurchlässigen Medium erfolgt, werden vorzugsweise opto-elektronische Mittel in Form eines zusätzlichen Detektionssystems eingesetzt. Derartige Mittel sind beispielsweise in der EP-A-0 186 226, der EP-A-0 189 536, der EP-A-0 476 397, der EP-A-0 499 177 oder der EP-A-0 772 171 beschrieben.Hazard detectors, especially intrusion detectors, are because of their high detection reliability often exposed to attempts at sabotage, from covering the detector to the latter Tear off the wall. Against covering or masking the detector, for example for passive infrared detectors by covering the detector with a cardboard box, hat or other suitable shielding or by spraying the detector's entry window for infrared radiation with an infrared-opaque medium are preferred opto-electronic means used in the form of an additional detection system. such Means are, for example, in EP-A-0 186 226, EP-A-0 189 536, EP-A-0 476 397 EP-A-0 499 177 or EP-A-0 772 171.

Eine andere Art von Sabotage besteht darin, den Intrusionsmelder durch unbefugtes Öffnen des Deckels lahmzulegen. Zur Detektion dieser Sabotage dient ein Deckelkontakt, der beim Entfernen des Deckels geöffnet wir. Es ist auch möglich, den Deckelkontakt mit der Verriegelung zwischen Boden und Deckel zu koppeln, so dass schon die Betätigung der Verriegelung detektiert wird (siehe dazu die EP-A-0 616 307).Another type of sabotage is to open the intrusion detector by unauthorized opening To cripple the cover. A cover contact is used to detect this sabotage we open the lid. It is also possible to interlock the lid with the latch To couple bottom and lid, so that the actuation of the lock is already detected (see EP-A-0 616 307).

Die Mittel zur Alarmauslösung bei gewaltsamer Entfernung, wie beispielsweise Abreissen, des Melders von der Wand sind bei einem bekannten Intrusionsmelder (Typ IR160 der Alarmcom AG, CH-8604 Volketswil) durch ein von einer Befestigungsschraube des Melders durchsetztes, aus dem Boden relativ leicht herausbrechbares Feld und durch einen Kontaktschalter gebildet. Der letztere ist auf einem nicht herausbrechbaren Teil des Bodens fixiert und drückt mit seinem federnden Kontakt gegen einen Vorsprung des herausbrechbaren Feldes. Beim Abreissen des Melders von der Wand verbleibt das aus dem Boden herausbrechbare Feld an der Wand, wogegen der Kontaktschalter von diesem Feld entfernt und dadurch der elektrische Kontakt geöffnet wird. Da die Melder sowohl für Wand- als auch für Eckmontage vorgesehen sind, sind mindestens zwei herausbrechbare Felder vorgesehen, wobei der Kontaktschalter jeweils an dem von der Befestigungsschraube durchsetzten Feld montiert werden muss. The means for triggering an alarm in the event of violent removal, such as tearing off the Detectors from the wall are in a known intrusion detector (type IR160 from Alarmcom AG, CH-8604 Volketswil) through a through which a fastening screw of the detector Field easily broken out of the ground and formed by a contact switch. The latter is fixed on an unbreakable part of the floor and presses with it resilient contact against a projection of the break-out field. When tearing off the Detector from the wall, the field that can be broken out of the floor remains on the wall, whereas the contact switch is removed from this field and the electrical contact is opened becomes. Since the detectors are designed for both wall and corner mounting At least two breakable fields are provided, the contact switch being on the field penetrated by the fastening screw.

Diese bekannte Lösung hat sich zwar sehr gut bewährt, sie erfordert aber zusätzlichen Montageaufwand und verursacht durch den Kontaktschalter auch zusätzliche Kosten. Durch die Erfindung sollen nun Mittel zur Alarmauslösung bei gewaltsamer Entfernung des Melders von der Wand angegeben werden, welche einerseits ein Kostenreduktion und andererseits eine Vereinfachung der Montage ermöglichen.This known solution has proven itself very well, but it requires additional assembly effort and also causes additional costs through the contact switch. By the invention should now be means for triggering the alarm when the detector is forcibly removed from the Wall are specified, which on the one hand a cost reduction and on the other hand a simplification enable assembly.

Diese Aufgabe wird erfindungsgemäss dadurch gelöst, dass der Boden einen streifenförmigen, von Schwachstellen umrandeten Bereich mit mehreren Einschraubstellen für eine Befestigungsschraube enthält, und dass dieser streifenförmige Bereich einen gegen den Deckel ragenden Steg aufweist, welcher mit seinem freien Ende bei geschlossenem Gehäuse einen im Deckel montierten Kontaktschalter schliesst.According to the invention, this object is achieved in that the base has a strip-shaped, area surrounded by weak points with several screw-in points for a fastening screw contains, and that this strip-shaped region protrudes against the lid Has web, which with its free end when the housing is closed in the lid mounted contact switch closes.

Der streifenförmige Bereich mit den mehreren Einschraubstellen hat den Vorteil, dass unabhängig davon, welche der Einschraubstellen die Befestigungsschraube enthält, beim Abreissen des Melders der ganze streifenförmige Bereich aus dem Boden herausgebrochen wird. Das ermöglicht, dass der Kontaktschalter für die verschiedenen Befestigungsarten nur an einer einzigen Stelle angeordnet werden muss. Durch den nach vorne ragenden Steg und den diesem zugeordneten Kontaktschalter im Deckel, ergibt sich der Vorteil, dass durch einen einzigen Kontaktschalter sowohl das Öffnen des Deckels als auch das Abreissen des Melders von der Wand detektiert werden kann. Das bedeutet eine Kostenersparnis, weil ein Kontaktschalter wegfällt und ausserdem eine nicht unwesentliche Erleichterung bei der Montage des Melders, weil der Kontaktschalter im Werk montiert wird und nicht mehr vor Ort in den Melder eingesetzt werden muss. Dadurch ist auch jede Gefahr ausgeschaltet, dass der Kontaktschalter an der falschen Stelle in den Melder eingesetzt wird.The strip-shaped area with the several screw-in points has the advantage of being independent of which of the screw-in points contains the fastening screw when tearing off the The entire strip-shaped area is broken out of the ground. This allows, that the contact switch for the different types of fastening only on one Place must be arranged. Through the protruding web and the associated one Contact switch in the lid, there is the advantage of having a single contact switch both opening the cover and tearing the detector off the wall can be detected. This means cost savings because there is no contact switch and also a not insignificant relief when installing the detector, because the Contact switch is installed in the factory and can no longer be used on site in the detector got to. This also eliminates any danger that the contact switch is at the wrong one Place in the detector.

Eine erste bevorzugte Ausführungsform des erfindungsgemässen Gehäuses ist dadurch gekennzeichnet, dass der streifenförmige Bereich quer über den Boden verläuft und Einschraubstellen für verschiedene Befestigungsarten des Gefahrenmelders, wie Wand- und Eckmontage, aufweist.A first preferred embodiment of the housing according to the invention is characterized in that that the strip-shaped area runs across the floor and screw-in points for different types of fastening of the hazard detector, such as wall and corner mounting, having.

Eine zweite bevorzugte Ausführungsform des erfindungsgemässen Gehäuses ist dadurch gekennzeichnet, dass der Deckel eine die Auswerteelektronik tragende Leiterplatte enthält, und dass der Kontaktschalter auf dieser Leiterplatte angeordnet ist.A second preferred embodiment of the housing according to the invention is characterized in that that the cover contains a circuit board carrying the evaluation electronics, and that the contact switch is arranged on this circuit board.

Nachfolgend wird die Erfindung anhand eines in den Zeichungen dargestellten Ausführungsbeispiels näher erläutert; es zeigt:

Fig. 1
eine Vorderansicht des Bodens eines erfindungsgemässen Gehäuses,
Fig. 2
eine Ansicht in Richtung des Pfeiles II von Fig. 1; und
Fig. 3
einen Schnitt durch ein vollständiges Gehäuse nach der Linie III - III von Fig. 1.
The invention is explained in more detail below on the basis of an exemplary embodiment shown in the drawings; it shows:
Fig. 1
a front view of the bottom of a housing according to the invention,
Fig. 2
a view in the direction of arrow II of Fig. 1; and
Fig. 3
a section through a complete housing along the line III - III of Fig. 1st

Das Gehäuse für einen Gefahrenmelder, insbesondere einen Passiv-Infrarotmelder besteht aus einem Boden 1 und einem mit diesem lösbar verbindbaren Deckel 2. Die Verbindung zwischen dem Boden 1 und dem Deckel 2, die nicht Gegenstand der vorliegenden Patentanmeldung bildet, ist vorzugsweise eine mit einer Schraube fixierbare Rastverbindung. Zu diesem Zweck weist der Boden 1 an seiner unteren Querkante zwei in Vorsprüngen 3 angeordnete Schlitze 4 auf, die zur Aufnahme von entsprechenden, an der unteren Querkante des Deckels 2 angeordneten Nasen (nicht dargestellt) vorgesehen sind.The housing for a hazard detector, in particular a passive infrared detector, consists of a bottom 1 and a cover 2 which can be releasably connected to it. The connection between the bottom 1 and the cover 2, which is not the subject of the present patent application, is preferably a locking connection fixable with a screw. To this end the bottom 1 has at its lower transverse edge two slots 4 arranged in projections 3 on, which are arranged to accommodate corresponding, on the lower transverse edge of the lid 2 Noses (not shown) are provided.

Der Deckel 2 wird mit den Nasen in die Schlitze 4 geschoben, wobei er vom Boden 1 um einen Winkel von etwa 30° weggeschwenkt ist. Der Deckel 2 ist in dieser Position am Boden 1 fixiert und wird anschliessend gegen den Boden geklappt, wobei am Ende dieser Bewegung im Bereich der oberen Querkante des Bodens 1 angeordnete federnde Haken 5 in entsprechende Gegenstücke des Deckels 2 einrasten. Anschliessend wird der Deckel 2 mit einer Schraube 6 an einer zwischen den Haken 5 liegenden Nase 7 fixiert. Der Kopf der Schraube 6 ist im Deckel 2 durch eine Lasche abgedeckt, so dass die Schraube 6 für einen Beobachter ohne nähere Untersuchung des Melders nicht erkennbar ist.The lid 2 is pushed into the slots 4 with the lugs, whereby it is from the bottom 1 by one Angle of about 30 ° is pivoted away. The cover 2 is fixed in this position on the bottom 1 and is then folded against the floor, at the end of this movement in the area the upper transverse edge of the bottom 1 arranged resilient hook 5 in corresponding Snap in counterparts of cover 2. The cover 2 is then screwed 6 fixed to a nose 7 lying between the hooks 5. The head of screw 6 is in the lid 2 covered by a tab, so that the screw 6 for an observer without further examination the detector is not recognizable.

Der Boden 1 enthält an seinem oberen Ende, knapp unterhalb der Haken 5, ein Buchsenetement 8 eines elektrischen Steckverbinders und ist in seiner unteren, durch einen Quersteg 9 abgetrennten Hälfte, im wesentlichen leer. Der Deckel 2 enthält eine Leiterplatte 10 welche unter anderem die Auswerteelektronik des Melders, einen Infrarotsensor 11 und einen Infrarotspiegel 12 zur Bündelung der durch ein infrarotdurchlässiges Fenster 13 im Deckel 2 auf den Infrarotspiegel 12 fallenden Infrarotstrahlung auf den Infrarotsensor 11 trägt. Diese Elemente sind bekannt; es wird in diesem Zusammenhang beispielhaft auf die EP-A-0 303 913 verwiesen.The bottom 1 contains at its upper end, just below the hook 5, a socket element 8 of an electrical connector and is in its lower, by a crosspiece 9th separated half, essentially empty. The cover 2 contains a circuit board 10 which among other things, the evaluation electronics of the detector, an infrared sensor 11 and an infrared mirror 12 for bundling the through an infrared window 13 in the lid 2 on the Infrared mirror 12 carries infrared radiation on the infrared sensor 11. These elements are known; in this context, reference is made, for example, to EP-A-0 303 913.

Am oberen Ende der Leiterplatte 10 ist als Gegenstück zum Buchsenelement 8 das Stiftelement 14 des elektrischen Steckverbinders angeordnet, welches beim Schliessen des Gehäuses in das Buchsenelement 8 gesteckt wird, wodurch der elektrische Kontakt mit der Stromversorgung und eventuellen Datenleitungen hergestellt ist. Die Stromversorgungsleitung und alle anderen Leitungen sind durch Durchbrechungen im Boden 1 an das Buchsenelement 8 geführt.At the upper end of the circuit board 10 is the pin element as a counterpart to the socket element 8 14 of the electrical connector arranged, which when closing the housing in the socket element 8 is inserted, thereby making electrical contact with the power supply and possible data lines is established. The power line and everyone else Lines are led through openings in the bottom 1 to the socket element 8.

Wie insbesondere Fig. 1 entnommen werden kann, enthält der Boden 1 einen von Schwachstellen (Sollbruchstellen) umrandeten Querstreifen 15 mit drei Einschraubstellen 16 für Befestigungsschrauben und mit einem nach vorne, gegen den Deckel 2, ragenden Steg 17 (siehe dazu auch die Figuren 2 und 3). Der Boden 1 weist an seinen Längskanten je eine unter 45° geneigte Abschrägung auf; dementsprechend sind die Enden des Querstreifens 15 gegenüber dessen Mittelteil um 45° nach vome geneigt. Sowohl der Mittelteil als auch die beiden Enden des Querstreifens 15 enthalten je eine Einschraubstelle 16, wobei die Einschraubstelle des Mittelteils bei Wandmontage und die Einschraubstellen der Enden bei Eckmontage verwendet werden. As can be seen in particular from FIG. 1, the base 1 contains one of weak points (Predetermined breaking points) bordered transverse strips 15 with three screw-in points 16 for fastening screws and with a web 17 projecting towards the front against the cover 2 (see also also Figures 2 and 3). The bottom 1 has at its longitudinal edges one inclined at 45 ° Bevel on; accordingly, the ends of the transverse strip 15 are opposite to it Middle section inclined 45 ° to the front. Both the middle part and the two ends of the horizontal stripe 15 each contain a screw-in point 16, the screw-in point of the middle part at Wall mounting and the screwing in of the ends can be used for corner mounting.

Es sei noch erwähnt, dass die eigentliche Befestigung des Melders durch Schrauben erfolgt, die durch Bohrungen 18 im Boden 1 geführt sind. Die durch die Einschraubstellen 16 geführten Schrauben dienen nicht zur Befestigung des ganzen Melders, sondern in erster Linie zur Fixierung des Querstreifens 15 an der Wand.It should also be mentioned that the actual attachment of the detector is done by screws that are guided through holes 18 in the bottom 1. The led through the screw 16 Screws are not used to fasten the entire detector, but primarily to secure it of the stripe 15 on the wall.

Die Leiterplatte 10 trägt an ihrer dem Boden 1 zugewandten Seite einen Kontaktschalter 19, dessen Kontaktzunge gegen den Boden 1 ragt. Der Kontaktschalter 19 ist auf der Leiterplatte 10 so angeordnet, dass er unmittelbar vor der Endkante des Stegs 17 liegt, und der Steg 17 ist so dimensioniert, dass er bei geschlossenem Gehäuse den Kontakt am Schalter 19 schliesst. Sobald dieser Kontakt aus irgendeinem Grund geöffnet wird, erzeugt die Auswerteelektronik ein Sabo-tagesignal, welches anzeigt, dass der betreffende Melder ausser Funktion gesetzt ist.The circuit board 10 carries a contact switch 19 on its side facing the bottom 1, whose contact tongue protrudes against the floor 1. The contact switch 19 is on the circuit board 10 arranged so that it is immediately in front of the end edge of the web 17, and the web 17 dimensioned so that it closes the contact on switch 19 when the housing is closed. As soon as this contact is opened for any reason, the evaluation electronics generate one Sabo day signal, which indicates that the detector in question has been deactivated.

Die Öffnung des Kontakts am Schalter 19 kann zwei Ursachen haben:

  • Unbefugtes Entfernen des Deckels 2 vom Boden 1, beispielsweise durch Entfernen der Schraube 6, wodurch der Melder infolge Öffnung des elektrischen Steckverbinders 8, 14 nicht mehr funktionsfähig wäre. Hier wirkt der durch den Steg 17 und den Kontaktschalter 19 gebildete Sabotagedetektor also als Deckelkontakt.
  • Abreissen des Melders von der Wand, wobei der an der Wand befestigte Querstreifen 15 aus dem Boden 1 herausbricht und mitsamt dem Steg 17 an der Wand verbleibt, so dass die Endkante des Stegs 17 nicht mehr an der Kontaktzunge des Schalters 19 anliegt und der Kontakt an diesem Schalter geöffnet wird. Hier wirkt der Sabotagedetektor als Abreisskontakt.
The opening of the contact on switch 19 can have two causes:
  • Unauthorized removal of the cover 2 from the floor 1, for example by removing the screw 6, as a result of which the detector would no longer function as a result of the electrical connector 8, 14 being opened. Here the sabotage detector formed by the web 17 and the contact switch 19 thus acts as a cover contact.
  • Tear off the detector from the wall, the transverse strip 15 attached to the wall breaking out of the floor 1 and remaining together with the web 17 on the wall, so that the end edge of the web 17 no longer abuts the contact tongue of the switch 19 and the contact is on this switch is opened. Here the sabotage detector acts as a break contact.

Claims (5)

  1. Housing for an alarm, said housing having a base (1), a cover (2) detachably connectable to the base (1), wherein the base (1) is intended for fastening to a wall, and having a sabotage detector for triggering an alarm signal in the event of forcible removal of the alarm from the wall, characterized in that the base (1) contains a strip-shaped region (15) bordered by weak points and having a plurality of screw insertion points (16) for a fastening screw, and that said strip-shaped region (15) comprises a web (17) which projects towards the cover (2) and which, when the housing is closed, closes with its free end a contact switch (19) mounted in the cover (2).
  2. Housing according to claim 1, characterized in that the strip-shaped region extends transversely across the base (1) and comprises screw insertion points (16) for various methods of fastening the alarm, such as wall mounting and corner mounting.
  3. Housing according to claim 2, characterized in that the cover (2) contains a printed-circuit board (10) carrying evaluating electronics, and that the contact switch (19) is disposed on said printed-circuit board (10).
  4. Housing according to claim 3, characterized in that the sabotage detector, which is formed by the strip-shaped region (15) with the web (17) and the contact switch (19), triggers an alarm signal also in the event of unauthorized removal of the cover (2) from the base (1).
  5. Housing according to one of claims 1 to 4, characterized in that the cover (2) is fixed to the base (1) by means of a screw (6), and that the cover (2) comprises a flap for masking the head of said screw (6).
EP99104593A 1999-03-08 1999-03-08 Casing for hazard warning device Expired - Lifetime EP1037184B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE59907541T DE59907541D1 (en) 1999-03-08 1999-03-08 Housing for a hazard detector
EP99104593A EP1037184B1 (en) 1999-03-08 1999-03-08 Casing for hazard warning device
US09/511,836 US6297745B1 (en) 1999-03-08 2000-02-24 Housing for an alarm

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP99104593A EP1037184B1 (en) 1999-03-08 1999-03-08 Casing for hazard warning device

Publications (2)

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EP1037184A1 EP1037184A1 (en) 2000-09-20
EP1037184B1 true EP1037184B1 (en) 2003-10-29

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EP99104593A Expired - Lifetime EP1037184B1 (en) 1999-03-08 1999-03-08 Casing for hazard warning device

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US6297745B1 (en) 2001-10-02
EP1037184A1 (en) 2000-09-20

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