FR2433209A1 - Intrusion alarm detector for building openings - comprises magnetically operated switch connecting resistor into wheatstone bridge circuit - Google Patents

Intrusion alarm detector for building openings - comprises magnetically operated switch connecting resistor into wheatstone bridge circuit

Info

Publication number
FR2433209A1
FR2433209A1 FR7824060A FR7824060A FR2433209A1 FR 2433209 A1 FR2433209 A1 FR 2433209A1 FR 7824060 A FR7824060 A FR 7824060A FR 7824060 A FR7824060 A FR 7824060A FR 2433209 A1 FR2433209 A1 FR 2433209A1
Authority
FR
France
Prior art keywords
block
bridge circuit
wheatstone bridge
resistor
operated switch
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
FR7824060A
Other languages
French (fr)
Other versions
FR2433209B3 (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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to FR7824060A priority Critical patent/FR2433209A1/en
Publication of FR2433209A1 publication Critical patent/FR2433209A1/en
Application granted granted Critical
Publication of FR2433209B3 publication Critical patent/FR2433209B3/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

Detectors for an alarm system are connected into a Wheatstone bridge circuit to protect openings such as doors and windows in a building or apartment. A detector comprises two blocks each containing a magnet and contacts on either side. One block contains a resistor. One block is fixed above the opening with its contacts connected into the detection loop while the block with the resistor is movable and is located below the first block in the opening frame. Slides permit it to move freely in a vertical direction such that when the door is closed it is attracted to the other block to close the contacts to connect the resistor into a Wheatstone bridge circuit. When the door is opened the block falls under its own weight to open the circuit.
FR7824060A 1978-08-08 1978-08-08 Intrusion alarm detector for building openings - comprises magnetically operated switch connecting resistor into wheatstone bridge circuit Granted FR2433209A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7824060A FR2433209A1 (en) 1978-08-08 1978-08-08 Intrusion alarm detector for building openings - comprises magnetically operated switch connecting resistor into wheatstone bridge circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7824060A FR2433209A1 (en) 1978-08-08 1978-08-08 Intrusion alarm detector for building openings - comprises magnetically operated switch connecting resistor into wheatstone bridge circuit

Publications (2)

Publication Number Publication Date
FR2433209A1 true FR2433209A1 (en) 1980-03-07
FR2433209B3 FR2433209B3 (en) 1981-03-27

Family

ID=9211897

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7824060A Granted FR2433209A1 (en) 1978-08-08 1978-08-08 Intrusion alarm detector for building openings - comprises magnetically operated switch connecting resistor into wheatstone bridge circuit

Country Status (1)

Country Link
FR (1) FR2433209A1 (en)

Also Published As

Publication number Publication date
FR2433209B3 (en) 1981-03-27

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Legal Events

Date Code Title Description
ST Notification of lapse
AR Application made for restoration
DA Annulment of decision of lapse
DE Withdrawal due to an action of restoration