GB1345412A - Electrical alarm systems - Google Patents

Electrical alarm systems

Info

Publication number
GB1345412A
GB1345412A GB387071A GB1345412DA GB1345412A GB 1345412 A GB1345412 A GB 1345412A GB 387071 A GB387071 A GB 387071A GB 1345412D A GB1345412D A GB 1345412DA GB 1345412 A GB1345412 A GB 1345412A
Authority
GB
United Kingdom
Prior art keywords
relay
loop
alarm
energized
rectifier
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
Application number
GB387071A
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.)
Lewis N W
Original Assignee
Lewis N W
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 Lewis N W filed Critical Lewis N W
Publication of GB1345412A publication Critical patent/GB1345412A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B19/00—Alarms responsive to two or more different undesired or abnormal conditions, e.g. burglary and fire, abnormal temperature and abnormal rate of flow
    • G08B19/005—Alarms responsive to two or more different undesired or abnormal conditions, e.g. burglary and fire, abnormal temperature and abnormal rate of flow combined burglary and fire alarm systems
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/018—Sensor coding by detecting magnitude of an electrical parameter, e.g. resistance

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Burglar Alarm Systems (AREA)
  • Alarm Systems (AREA)

Abstract

1345412 Alarm systems N W LEWIS 31 Jan 1972 [4 Feb 1971] 3870/71 Heading G4N An alarm system comprise a loop including a rectifier 4 and sensing contacts 3, 5, a first relay 14, normally energized so as to respond to open circuiting of the loop and further relay 11, normally de-energized so as to respond to short circuiting of the rectifier 4. As described, sensing switches 3, 5 may be operated by opening a window or drawer, or by pressure on a carpet and may be magnetically-operated reed units. Alternatively, the switches may be heat- or light-responsive. With switch 6 in the "Normal" position shown, relay 11 is energized from transformer 7 via rectifiers 4 and 9, but becomes released by the opening of series contacts 3. Relay 14 is energized via rectifier 12 if any of the shunt contacts 5 is closed. The release of relay 11 or energization of relay 14 energizes relay 23 to operate alarm 27. The alarm 27 continues until reset by switch 6, which may be operated by a key or combination. A 30 sec. delay may be included to allow authorized resetting of a burglar alarm. Modifications.-Rectifiers 9 and 28 may be omitted if polarized relays are used. Relays 11 and 14 may be replaced by thyristors operating in conjunction with integrated logic circuits. The loop may contain chokes or capacitors, the impedance of which changes in response to the proximity of an intruder. Multiple loop systems.-In Fig. 2 (not shown), a pair of loops similar to that shown in Fig. 1 are connected in series with a single rectifier. Each loop has a three-position control switch providing "alert", "dormant" and "reset" facilities.
GB387071A 1971-02-04 1972-01-31 Electrical alarm systems Expired GB1345412A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB387071 1971-02-04

Publications (1)

Publication Number Publication Date
GB1345412A true GB1345412A (en) 1974-01-30

Family

ID=9766447

Family Applications (1)

Application Number Title Priority Date Filing Date
GB387071A Expired GB1345412A (en) 1971-02-04 1972-01-31 Electrical alarm systems

Country Status (2)

Country Link
US (1) US3813662A (en)
GB (1) GB1345412A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2451199A1 (en) * 1979-03-15 1980-10-10 Nissan Motor SAFETY ALARM SYSTEM FOR AN AUTOMATIC SAFETY BELT USED WITH VEHICLE SEATS
WO2010052606A3 (en) * 2008-11-04 2010-07-01 Koninklijke Philips Electronics N.V. Lighting arrangement comprising a carpet with back lighting for providing dynamic light effects with the carpet
WO2010092507A1 (en) * 2009-02-10 2010-08-19 Koninklijke Philips Electronics N.V. Carpet unit comprising optical sensor

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3980995A (en) * 1974-12-17 1976-09-14 Tulio Vasquez Alarm system
US5134248A (en) * 1990-08-15 1992-07-28 Advanced Temperature Devices, Inc. Thin film flexible electrical connector
WO2019242863A1 (en) 2018-06-21 2019-12-26 Autronica Fire & Security As System and method for startup of a detector loop

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3176283A (en) * 1962-02-15 1965-03-30 Honeywell Inc Supervised annunciator
US3254334A (en) * 1963-12-19 1966-05-31 American District Telegraph Co Electrical protection system utilizing reverse polarity line testing with unidirectional current devices having reverse breakdown characteristic
US3351934A (en) * 1965-05-19 1967-11-07 Honeywell Inc Supervised alarm system
US3500394A (en) * 1966-12-23 1970-03-10 Honeywell Inc Control apparatus
US3618081A (en) * 1969-06-12 1971-11-02 Edwards Co Condition detection and alarm system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2451199A1 (en) * 1979-03-15 1980-10-10 Nissan Motor SAFETY ALARM SYSTEM FOR AN AUTOMATIC SAFETY BELT USED WITH VEHICLE SEATS
WO2010052606A3 (en) * 2008-11-04 2010-07-01 Koninklijke Philips Electronics N.V. Lighting arrangement comprising a carpet with back lighting for providing dynamic light effects with the carpet
US9927115B2 (en) 2008-11-04 2018-03-27 Philips Lighting Holding B.V. Lighting arrangement comprising a carpet with back lighting for providing dynamic light effects with the carpet
WO2010092507A1 (en) * 2009-02-10 2010-08-19 Koninklijke Philips Electronics N.V. Carpet unit comprising optical sensor
US8564207B2 (en) 2009-02-10 2013-10-22 Koninklijke Philips N.V. Carpet unit comprising optical sensor

Also Published As

Publication number Publication date
US3813662A (en) 1974-05-28

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Legal Events

Date Code Title Description
414F Notice of opposition given (sect. 14/1949)
414B Case decided by the comptroller ** grants allowed (sect. 14/1949)
PS Patent sealed [section 19, patents act 1949]
PLE Entries relating assignments, transmissions, licences in the register of patents
PLE Entries relating assignments, transmissions, licences in the register of patents
PCNP Patent ceased through non-payment of renewal fee