EP0283376B1 - Magnetically controlled detector of the movement of a mobile part with respect to a fixed part for the opening of an enclosure - Google Patents

Magnetically controlled detector of the movement of a mobile part with respect to a fixed part for the opening of an enclosure 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
German (de)
French (fr)
Other versions
EP0283376A1 (en
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
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Filing date
Publication date
Application filed by Fichet Bauche SA filed Critical Fichet Bauche SA
Publication of EP0283376A1 publication Critical patent/EP0283376A1/en
Application granted granted Critical
Publication of EP0283376B1 publication Critical patent/EP0283376B1/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
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR 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)

Description

L'invention concerne un détecteur à commande magnétique du déplacement d'un organe mobile par rapport à un organe fixe, selon le préambule de la revendication principale.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.

Un détecteur de ce type est connu par le brevet US No 2 877 361. Dans ce détecteur connu le contact comparable au contact de sécurité selon l'invention est placé dans les champs magnétiques à la fois de l'aimant principal et d'un deuxième aimant. La disposition du contact et des aimants est choisie de telle façon que les deux champs s'annulent au niveau du contact lorsque la porte est fermée.A detector of this type is known from US Patent No. 2 877 361. In this known sensor 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.

Le détecteur connu présente l'inconvénient que la sensibilité aux champs magnétiques non produits par l'aimant principal, du contact de sécurité, est relativement faible et n'assure donc pas le déclenchement sûr d'une alarme lorsqu'une personne ouvre la porte de l'enceinte en utilisant un aimant de sabotage dans l'environnement de l'aimant principal.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.

La présente invention a pour objectif de proposer un détecteur à commande magnétique du type défini plus haut, qui ne présente pas l'inconvénient sus-mentionné.The present invention aims to provide a magnetic control detector of the type defined above, which does not have the above-mentioned drawback.

Ce but est atteint grâce aux caractéristiques figurant dans la partie caractérisante de la revendication principale.This object is achieved thanks to the characteristics appearing in the characterizing part of the main claim.

La sensibilité accrue du détecteur selon l'invention, à des champs magnétiques non produits par l'aimant principal est obtenue par le fait que le contact de sécurité est rendu insensible à l'aimant principal du fait du deuxième aimant disposé de façon à former un écran entre l'aimant principal et le contact de sécurité et en prévoyant des moyens de guidage de champ magnétique externe vers le contact de sécurité.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.

D'autres caractéristiques avantageuses de l'invention font partie des revendications qui sont rattachées à la revendication principale.Other advantageous features of the invention form part of the claims which are attached to the main claim.

L'invention sera mieux comprise et d'autres buts, détails et avantages de celle-ci apparaîtront plus clairement au cours de la description explicative qui va suivre faite en référence à la figure unique annexée, donnée uniquement à titre d'exemple et illustrant de façon schématique un mode de réalisation de l'invention.The invention will be better understood and other objects, details and advantages thereof will appear more clearly during the explanatory description which follows, made with reference to the single appended figure, given solely by way of example and illustrating schematically an embodiment of the invention.

Comme le montre la figure, un détecteur à commande magnétique selon l'invention comprend essentiellement un aimant principal 1 monté sur la porte 2 d'une enceinte et un dispositif 3 incorporé à la structure fixe 4 d'encadrement de la porte, en face de l'aimant 1.As shown in the figure, a magnetic control detector according to the invention 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.

Ce dispositif comprend un contact électrique 5 avantageusement fermé à l'état de surveillance et monté dans un circuit d'alarme, de façon à être situé dans le champ magnétique de l'aimant principal 1 lorsque la porte est fermée et un contact de sécurité 6 faisant partie d'un circuit électrique de déclenchement d'une alarme signalant la présence d'un champ magnétique parasite dans l'environnement de l'aimant principal 1, susceptible de perturber le fonctionnement correct du contact principal 5. Les deux contats 5 et 6 sont des contacts d'un relais du type REED, c'est-à-dire à lames souples à l'intérieur d'une ampoule. Les deux relais sont juxtaposés de façon que leurs ampoules soient parallèles l'une à l'autre et à l'axe de l'aimant principal 1 lorsque la porte est fermée.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.

Sur le contact principal 5 se trouve un petit aimant supplémentaire 7 qui s'étend parallèlement à l'aimant 1, mais est orienté de façon à fonctionner dans le sens inverse de cet aimant. L'aimant 7 se trouvant entre les deux contacts, à un emplacement approprié, il forme un écran entre l'aimant principal 1 et le contact de sécurité, pour que l'influence de l'aimant 1 sur ce contact soit relativement faible.On the main contact 5 is 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.

De plus, deux plaquettes métalliques 8 et 9, avantageusement en acier doux, sont placées perpendiculairement sur les axes des deux ampoules de contact 5 et 6, au-dessus et en dessous de celles-ci, de façon à former deux moyens guides des champs magnétiques vers le contact 6. Ces plaquettes sont adaptées et disposées de façon à accomplir deux fonctions. Elles présentent pratiquement un court-circuit pour le champ magnétique de l'aimant principal 1, par leur positionnement près des lames de l'ampoule du contact 5, ainsi que par le fait que le contact 5 soit fermé en surveillance, l'aimant 7 établissant contre l'aimant 1 et le contact 6 une barrière qui affaiblit l'action de l'aimant 1 sur le contact 6. Une autre fonction principale des plaques-guides réside dans le fait que tout champ magnétique externe sera guidé par ces plaques vers le contact 6 et conditioné autour de celui-ci, de sorte que ce contact devienne très sensible à des aimants externes, tels que des aimants de sabotage ou parasites, mais nettement moins sensible pour l'aimant principal, c'est-à-dire le fonctionnement 1.In addition, two metal plates 8 and 9, advantageously made of mild steel, 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. Another main function of the guide plates lies in the fact that any external magnetic field will be guided by these plates towards contact 6 and conditioned around it, so that this contact becomes very sensitive to external magnets, such as sabotage magnets or parasites, but much less sensitive for the main magnet, that is to say operation 1.

Le fonctionnement du détecteur que vient d'être décrit, ressort de façon évidente de la description qui vient d'être faite. On comprend aisément que le contact 5 s'ouvre lors de l'ouverture de la porte, ce qui déclenche une alarme dans le centre de surveillance. Lorsque l'on essaie de maintenir fermé le contact 5 à l'aide d'un champ magnétique externe de sabotage, le détecteur est en mesure d'informer le centre de l'ouverture de la porte puisque le champ magnétique de contact 5 devient déséquilibré, et en plus du fait que les plaques-guides 8 orientent ce champ magnétique de sabotage vers le contact de sécurité ou d'auto-protection 6. Ce contact se fermera et permettra ainsi la transmission d'un signal d'alarme approprié au centre de surveillance.The operation of the detector which has just been described, is evident from the description which has just been made. It is easy to understand that contact 5 opens when the door is opened, which triggers an alarm in the surveillance center. When trying to keep contact 5 closed using an external sabotage magnetic field, the detector is able to inform the center of the door opening since the contact magnetic field 5 becomes unbalanced , and in addition to the fact that the guide plates 8 orient this magnetic sabotage field towards the safety or self-protection contact 6. This contact will close and thus allow the transmission of an appropriate alarm signal to the center monitoring.

Claims (4)

  1. Magnetically controlled detector of the displacement of a movable member with respect to a stationary member, for the opening of an enclosure such in particular as a door or a window, of the type comprising an electrical contact mounted in an alarm circuit, carried by one of the said members so as to be located in the magnetic field of the main magnet carried by the other member when the enclosure is closed, and a safety contact sensitive to magnetic fields not produced by the main magnet and placed on the alarm contact carrying member, characterized in that the member (4) carrying the main alarm contact (5) moreover comprises means (8,9) for guiding external magnetic fields towards the said safety contact (6) and a second magnet (7) disposed so as to form a screen between the main magnet (1) and the safety contact (6) to reduce the influence of this magnet (1) upon the safety contact (6).
  2. Detector according to claim 1, characterized in that the aforesaid means (8,9) for guiding external magnetic fields are formed of metal plates advantageously of soft steel which are disposed so as to form a short circuit for the magnetic field of the main magnet (1), the main contact (5) being advantageously closed in the monitoring state.
  3. Detector according to one of claims 1 or 2, characterized in that the main magnet (1), the main contact (5) and the safety contact (6) are disposed side-by-side when the enclosure is closed and the magnet (7) is placed between both contacts (5) and (6) while being oriented so as to be biassed in the reverse direction of the main magnet (1).
  4. Device according to one of the foregoing claims, characterized in that the aforesaid contacts (5) and (6) are relay contacts located each one in a bulb, in that the latter are parallel and juxtaposed and in that the plates (8,9) for guiding magnetic fields extend perpendicularly to the bulbs on either side of the latter.
EP19880400527 1987-03-05 1988-03-04 Magnetically controlled detector of the movement of a mobile part with respect to a fixed part for the opening of an enclosure Expired - Lifetime EP0283376B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8703008 1987-03-05
FR8703008A FR2611956B1 (en) 1987-03-05 1987-03-05 DETECTOR WITH MAGNETICALLY CONTROLLED MOVEMENT OF A MOBILE MEMBER IN RELATION TO A FIXED MEMBER, FOR OPENING A SPEAKER

Publications (2)

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

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ID=9348642

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880400527 Expired - Lifetime EP0283376B1 (en) 1987-03-05 1988-03-04 Magnetically controlled detector of the movement of a mobile part with respect to a fixed part for the opening of an enclosure

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EP (1) EP0283376B1 (en)
ES (1) ES2004482T3 (en)
FR (1) FR2611956B1 (en)

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 (en) * 1968-11-08 1971-10-20
FR2130951A5 (en) * 1971-03-26 1972-11-10 Dentzer Noxa Groupe

Also Published As

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

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