FR2336659A1 - Magnetic displacement detector for burglar alarm systems - comprises three switches, with principal magnet and keeping magnet - Google Patents

Magnetic displacement detector for burglar alarm systems - comprises three switches, with principal magnet and keeping magnet

Info

Publication number
FR2336659A1
FR2336659A1 FR7539649A FR7539649A FR2336659A1 FR 2336659 A1 FR2336659 A1 FR 2336659A1 FR 7539649 A FR7539649 A FR 7539649A FR 7539649 A FR7539649 A FR 7539649A FR 2336659 A1 FR2336659 A1 FR 2336659A1
Authority
FR
France
Prior art keywords
magnet
principal
detector
keeping
switches
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
FR7539649A
Other languages
French (fr)
Other versions
FR2336659B1 (en
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.)
LYNX ALARM
Original Assignee
LYNX ALARM
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 LYNX ALARM filed Critical LYNX ALARM
Priority to FR7539649A priority Critical patent/FR2336659A1/en
Publication of FR2336659A1 publication Critical patent/FR2336659A1/en
Application granted granted Critical
Publication of FR2336659B1 publication Critical patent/FR2336659B1/fr
Granted legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

A magnetic detector is described which senses the relative displacement of two objects and which is particularly applicable in burglar alarm systems as a detector of opening doors or windows. A magnet (17) is fitted to one point of the door or window while the detector (16) is fitted to the other part. It comprises a first switch (13) which is normally open but which is closed under the effect of the magnetic field created by the principal magnet, and a second switch (14) which has a keeping magnet (18). The two switches are (13, 18) are in parallel in a circuit and the magnetic fields created by the principal magnet (17) and the keeping magnet (18) are opposed so that the circuit is momentarily opened when the principal magnet (17) moves away from the detector (16). A third switch (15) is fitted in another part of the circuit which is normally open but which is kept closed under the action of the principal magnet (17).
FR7539649A 1975-12-24 1975-12-24 Magnetic displacement detector for burglar alarm systems - comprises three switches, with principal magnet and keeping magnet Granted FR2336659A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7539649A FR2336659A1 (en) 1975-12-24 1975-12-24 Magnetic displacement detector for burglar alarm systems - comprises three switches, with principal magnet and keeping magnet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7539649A FR2336659A1 (en) 1975-12-24 1975-12-24 Magnetic displacement detector for burglar alarm systems - comprises three switches, with principal magnet and keeping magnet

Publications (2)

Publication Number Publication Date
FR2336659A1 true FR2336659A1 (en) 1977-07-22
FR2336659B1 FR2336659B1 (en) 1983-02-25

Family

ID=9164133

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7539649A Granted FR2336659A1 (en) 1975-12-24 1975-12-24 Magnetic displacement detector for burglar alarm systems - comprises three switches, with principal magnet and keeping magnet

Country Status (1)

Country Link
FR (1) FR2336659A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2438253A2 (en) * 1978-10-06 1980-04-30 Lynx Alarm Burglar alarm detecting relative movement - uses magnetic method in multi-element system and has in-built safeguard features to prevent disablement
FR2485774A1 (en) * 1980-06-26 1981-12-31 Cuggia Christiane Magnetic reed switch position detector e.g. for safe door - has test coil which acts against contact element to provide periodic testing of response of switch
FR2526519A1 (en) * 1982-05-05 1983-11-10 Cousin Pierre SAFETY DEVICE FOR STARTING AN ELECTRICAL APPARATUS
EP0127561A1 (en) * 1983-04-21 1984-12-05 Cosden Technology, Inc. Safety shield control device
FR2598005A1 (en) * 1986-04-25 1987-10-30 Const Elect Electro Cie Magnetic detection device, especially for protection against fraud

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2438253A2 (en) * 1978-10-06 1980-04-30 Lynx Alarm Burglar alarm detecting relative movement - uses magnetic method in multi-element system and has in-built safeguard features to prevent disablement
FR2485774A1 (en) * 1980-06-26 1981-12-31 Cuggia Christiane Magnetic reed switch position detector e.g. for safe door - has test coil which acts against contact element to provide periodic testing of response of switch
FR2526519A1 (en) * 1982-05-05 1983-11-10 Cousin Pierre SAFETY DEVICE FOR STARTING AN ELECTRICAL APPARATUS
EP0127561A1 (en) * 1983-04-21 1984-12-05 Cosden Technology, Inc. Safety shield control device
FR2598005A1 (en) * 1986-04-25 1987-10-30 Const Elect Electro Cie Magnetic detection device, especially for protection against fraud

Also Published As

Publication number Publication date
FR2336659B1 (en) 1983-02-25

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Legal Events

Date Code Title Description
ST Notification of lapse