FR2347728A1 - Antitheft system with automatic detector contact reset - uses magnet to operate contact and has second magnet to reset contact - Google Patents

Antitheft system with automatic detector contact reset - uses magnet to operate contact and has second magnet to reset contact

Info

Publication number
FR2347728A1
FR2347728A1 FR7610105A FR7610105A FR2347728A1 FR 2347728 A1 FR2347728 A1 FR 2347728A1 FR 7610105 A FR7610105 A FR 7610105A FR 7610105 A FR7610105 A FR 7610105A FR 2347728 A1 FR2347728 A1 FR 2347728A1
Authority
FR
France
Prior art keywords
contact
magnet
reset
operate
door
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
FR7610105A
Other languages
French (fr)
Other versions
FR2347728B3 (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.)
BAE PROTECTION SA
Original Assignee
BAE PROTECTION 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 BAE PROTECTION SA filed Critical BAE PROTECTION SA
Priority to FR7610105A priority Critical patent/FR2347728A1/en
Publication of FR2347728A1 publication Critical patent/FR2347728A1/en
Application granted granted Critical
Publication of FR2347728B3 publication Critical patent/FR2347728B3/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

The system uses an electro magnetic contact. This contact (4) is fitted in a door or window frame (5). The contact (4) is connected into an electrical circuit and its change of state actuates an alarm of predetermined duration. The contact (4) is closed by the action of a magnetic field. This field has on the axis of the contact a magnetic intensity at least equal to a calibrated value Io. This value Io is such that it will overcome the inertia of the contact. The system also uses a magnet which is fixed in the door or window. The system uses a second resetting magnet (6) which is fitted into the door or window (7). This magnet (6) is set in an invariable position with respect to the magnetically operated contact.
FR7610105A 1976-04-07 1976-04-07 Antitheft system with automatic detector contact reset - uses magnet to operate contact and has second magnet to reset contact Granted FR2347728A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7610105A FR2347728A1 (en) 1976-04-07 1976-04-07 Antitheft system with automatic detector contact reset - uses magnet to operate contact and has second magnet to reset contact

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7610105A FR2347728A1 (en) 1976-04-07 1976-04-07 Antitheft system with automatic detector contact reset - uses magnet to operate contact and has second magnet to reset contact

Publications (2)

Publication Number Publication Date
FR2347728A1 true FR2347728A1 (en) 1977-11-04
FR2347728B3 FR2347728B3 (en) 1978-12-29

Family

ID=9171496

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7610105A Granted FR2347728A1 (en) 1976-04-07 1976-04-07 Antitheft system with automatic detector contact reset - uses magnet to operate contact and has second magnet to reset contact

Country Status (1)

Country Link
FR (1) FR2347728A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5668533A (en) * 1995-06-07 1997-09-16 Securitron Magnalock Corporation High security balanced-type, magnetically-actuated proximity switch system
EP2533218A1 (en) * 2011-06-10 2012-12-12 Markus Bräm Manipulation-proof switch and manipulation-proof method, in particular for monitoring doors, windows, etc.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5668533A (en) * 1995-06-07 1997-09-16 Securitron Magnalock Corporation High security balanced-type, magnetically-actuated proximity switch system
EP2533218A1 (en) * 2011-06-10 2012-12-12 Markus Bräm Manipulation-proof switch and manipulation-proof method, in particular for monitoring doors, windows, etc.

Also Published As

Publication number Publication date
FR2347728B3 (en) 1978-12-29

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Legal Events

Date Code Title Description
ST Notification of lapse