EP0283376A1 - 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
EP0283376A1
EP0283376A1 EP88400527A EP88400527A EP0283376A1 EP 0283376 A1 EP0283376 A1 EP 0283376A1 EP 88400527 A EP88400527 A EP 88400527A EP 88400527 A EP88400527 A EP 88400527A EP 0283376 A1 EP0283376 A1 EP 0283376A1
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.)
Granted
Application number
EP88400527A
Other languages
English (en)
French (fr)
Other versions
EP0283376B1 (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 present invention relates to a detector with magnetic control of the movement of a movable member relative to a fixed member, for the opening of an enclosure, such as in particular a door or a window, of the type comprising an electrical contact mounted in a alarm circuit, carried by one of said members so as to be located in the magnetic field of a main magnet carried by the other member, when the enclosure is closed, and a safety contact sensitive to magnetic fields nons produced by the main magnet and placed on the body carrying the alarm contact.
  • the safety contact has the function of allowing the triggering of an alarm when a person opens the door of the enclosure by blocking the contact of the aforementioned alarm circuit using a sabotage magnet.
  • This known detector has the drawback, however, that the safety contact must be at a sufficiently large distance from the main alarm magnet to reduce its sensitivity towards the latter and still be selectively sensitive to a magnet. sabotage or pirate that could be in the environment of the main magnet.
  • the object of the present invention is to propose a magnetic control detector of the type defined above which does not have the above-mentioned drawback.
  • the detector according to the invention is characterized in that the member carrying the main alarm contact further comprises means for guiding external magnetic fields towards said safety contact and a second magnet arranged so as to form a screen between the main magnet and the contact to reduce the influence of this magnet on the safety contact.
  • the means for guiding the magnetic field are formed by metal plates, advantageously made of mild steel, which are arranged so as to form a short circuit for the magnetic field of the main magnet.
  • the main magnet, the main contact and the safety contact are arranged one next to the other when the enclosure is closed, and the screen magnet is placed between the two contacts being oriented so as to be polarized in the opposite direction to the main magnet.
  • 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 relay of the REED type, 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 to 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.

Landscapes

  • 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)
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 true EP0283376A1 (de) 1988-09-21
EP0283376B1 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)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008001375A3 (en) * 2006-06-29 2008-07-03 Roseman Engineering Ltd Tamper-resistant identification device
GB2450890A (en) * 2007-07-10 2009-01-14 Elmdene Internat Ltd Magnetic contact

Citations (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

Patent Citations (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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008001375A3 (en) * 2006-06-29 2008-07-03 Roseman Engineering Ltd Tamper-resistant identification device
GB2450890A (en) * 2007-07-10 2009-01-14 Elmdene Internat Ltd Magnetic contact
GB2450890B (en) * 2007-07-10 2011-12-14 Elmdene Internat Ltd Magnetic contact

Also Published As

Publication number Publication date
FR2611956B1 (fr) 1993-12-17
ES2004482A4 (es) 1989-01-16
FR2611956A1 (fr) 1988-09-09
EP0283376B1 (de) 1992-05-20
ES2004482T3 (es) 1993-03-01

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