EP0283376B1 - Magnetisch gesteuerter Fühler für die Umstellung eines mobilen Teiles hinsichtlich eines festen Teiles für die Öffnung eines abgeschlossenen Raumes - Google Patents

Magnetisch gesteuerter Fühler für die Umstellung eines mobilen Teiles hinsichtlich eines festen Teiles für die Öffnung eines abgeschlossenen Raumes Download PDF

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Publication number
EP0283376B1
EP0283376B1 EP19880400527 EP88400527A EP0283376B1 EP 0283376 B1 EP0283376 B1 EP 0283376B1 EP 19880400527 EP19880400527 EP 19880400527 EP 88400527 A EP88400527 A EP 88400527A EP 0283376 B1 EP0283376 B1 EP 0283376B1
Authority
EP
European Patent Office
Prior art keywords
contact
magnet
main
enclosure
main magnet
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
EP19880400527
Other languages
English (en)
French (fr)
Other versions
EP0283376A1 (de
Inventor
Paul Vanslambrouck
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.)
Fichet Bauche SA
Original Assignee
Fichet Bauche SA
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 Fichet Bauche SA filed Critical Fichet Bauche SA
Publication of EP0283376A1 publication Critical patent/EP0283376A1/de
Application granted granted Critical
Publication of EP0283376B1 publication Critical patent/EP0283376B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL 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
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/08—Mechanical actuation by opening, e.g. of door, of window, of drawer, of shutter, of curtain, of blind

Definitions

  • the invention relates to a detector with magnetic control of the movement of a movable member relative to a fixed member, according to the preamble of the main claim.
  • a detector of this type is known from US Patent No. 2 877 361.
  • the touch comparable to the safety switch according to the invention is placed in the magnetic fields of both the main magnet and a second magnet.
  • the arrangement of the contact and the magnets is chosen in such a way that the two fields cancel each other out at the contact when the door is closed.
  • the known detector has the disadvantage that the sensitivity to magnetic fields not produced by the main magnet, of the safety contact, is relatively low and therefore does not ensure the safe triggering of an alarm when a person opens the door. the enclosure using a tamper magnet in the environment of the main magnet.
  • the present invention aims to provide a magnetic control detector of the type defined above, which does not have the above-mentioned drawback.
  • the increased sensitivity of the detector according to the invention to magnetic fields not produced by the main magnet is obtained by the fact that the safety contact is made insensitive to the main magnet due to the second magnet arranged so as to form a screen between the main magnet and the contact of safety and providing means for guiding the external magnetic field to the safety contact.
  • a magnetic control detector essentially comprises a main magnet 1 mounted on the door 2 of an enclosure and a device 3 incorporated in the structure fixed door frame 4, opposite magnet 1.
  • This device comprises an electrical contact 5 advantageously closed in the monitoring state and mounted in an alarm circuit, so as to be located in the magnetic field of the main magnet 1 when the door is closed and a safety contact 6 forming part of an electric circuit triggering an alarm signaling the presence of a parasitic magnetic field in the environment of the main magnet 1, capable of disturbing the correct functioning of the main contact 5.
  • the two contats 5 and 6 are contacts of a REED type relay, that is to say with flexible blades inside a bulb. The two relays are juxtaposed so that their bulbs are parallel to each other and to the axis of the main magnet 1 when the door is closed.
  • a small additional magnet 7 which extends parallel to the magnet 1, but is oriented so as to operate in the opposite direction of this magnet.
  • the magnet 7 being between the two contacts, at a suitable location, it forms a screen between the main magnet 1 and the safety contact, so that the influence of the magnet 1 on this contact is relatively weak.
  • two metal plates 8 and 9 are placed perpendicularly on the axes of the two contact bulbs 5 and 6, above and below them, so as to form two field guide means. magnetic towards contact 6.
  • These plates are adapted and arranged so as to accomplish two functions. They practically have a short circuit for the magnetic field of the main magnet 1, by their positioning near the blades of the bulb of the contact 5, as well as by the fact that the contact 5 is closed in monitoring, the magnet 7 establishing a barrier against magnet 1 and contact 6 which weakens the action of magnet 1 on contact 6.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Burglar Alarm Systems (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)

Claims (4)

  1. Die Bewegung eines beweglichen Teiles gegenüber einem ortsfesten Teil erfassenden magnetisch gesteuerten Fühler für die Oeffnung eines umschlossenen Raumes, wie insbesondere einer Tür oder eines Fensters, derjenigen Gattung mit einem in einem Alarmstromkreis angeordneten, derart durch einen der besagten Teile getragenen Kontakt, dass er in dem magnetischen Feld des durch den anderen Teil getragenen Hauptmagnets liegt, wenn der umschlossene Raum geschlossen ist und einem für durch den Hauptmagneten nicht erzeugte magnetische Felder empfindlichen und auf dem den Alarmkontakt tragenden Teil liegenden Sicherheitskontakt, dadurch gekennzeichnet, dass der den Hauptalarmkontakt (5) tragende Teil (4) ausserdem Mittel (8,9) zur Führung von äusseren magnetischen Feldern zu dem besagten Sicherheitskontakt (6) hin und einen zweiten Magneten (7) aufweist, der angeordnet ist, um einen Schirm zwischen dem Hauptmagneten (1) und dem Sicherheitskontakt (6) zu bilden, um den Einfluss dieses Magneten (1) auf den Sicherheitskontakt (6) zu vermindern.
  2. Fühler nach Anspruch 1, dadurch gekennzeichnet, dass die vorgenannten Mittel (8,9) zur Führung von äusseren Magnetfeldern durch Metalplättchen vorteilhaft aus kohlenstoffarmen Stahl gebildet sind, die angeordnet sind, um einen Kurzschluss für das magnetische Feld des Hauptmagneten (1) zu bilden, wobei der Hauptkontakt (5) vorteilhaft im Überwachungszustand geschlossen ist.
  3. Fühler nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass der Hauptmagnet (1), der Hauptkontakt (5) und der Sicherheitskontakt (6) nebeneindander angeordnet sind, wenn der umschlossene Raum geschlossen ist und der Magnet (7) zwischen den beiden Kontakten (5) und (6) liegt, wobei diese Kontakte derart ausgerichtet sind, dass sie in umgekehrter Richtung gegenüber dem Hauptmagneten (1) polarisiert sind.
  4. Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die vorgenannten Kontakte (5) und (6) jeweils in einem Kolben liegende Relaiskontakte sind, dass dieselben parallel und nebeneinander angeordnet sind und dass die Platten (8,9) zur Führung von magnetischen Feldern sich senkrecht zu den Kolben beiderseits derselben erstrecken.
EP19880400527 1987-03-05 1988-03-04 Magnetisch gesteuerter Fühler für die Umstellung eines mobilen Teiles hinsichtlich eines festen Teiles für die Öffnung eines abgeschlossenen Raumes Expired - Lifetime EP0283376B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8703008A FR2611956B1 (fr) 1987-03-05 1987-03-05 Detecteur a commande magnetique du deplacement d'un organe mobile par rapport a un organe fixe, pour l'ouverture d'une enceinte
FR8703008 1987-03-05

Publications (2)

Publication Number Publication Date
EP0283376A1 EP0283376A1 (de) 1988-09-21
EP0283376B1 true EP0283376B1 (de) 1992-05-20

Family

ID=9348642

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880400527 Expired - Lifetime EP0283376B1 (de) 1987-03-05 1988-03-04 Magnetisch gesteuerter Fühler für die Umstellung eines mobilen Teiles hinsichtlich eines festen Teiles für die Öffnung eines abgeschlossenen Raumes

Country Status (3)

Country Link
EP (1) EP0283376B1 (de)
ES (1) ES2004482T3 (de)
FR (1) FR2611956B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008001375A2 (en) * 2006-06-29 2008-01-03 Roseman Engineering Ltd. Tamper-resistant identification device
GB2450890B (en) * 2007-07-10 2011-12-14 Elmdene Internat Ltd Magnetic contact

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2877361A (en) * 1957-04-12 1959-03-10 Holmes Electric Protective Com Burglar alarm system
GB1250803A (de) * 1968-11-08 1971-10-20
FR2130951A5 (de) * 1971-03-26 1972-11-10 Dentzer Noxa Groupe

Also Published As

Publication number Publication date
EP0283376A1 (de) 1988-09-21
FR2611956B1 (fr) 1993-12-17
ES2004482A4 (es) 1989-01-16
FR2611956A1 (fr) 1988-09-09
ES2004482T3 (es) 1993-03-01

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