GB1456681A - Loop alarm apparatus - Google Patents

Loop alarm apparatus

Info

Publication number
GB1456681A
GB1456681A GB228873A GB228873A GB1456681A GB 1456681 A GB1456681 A GB 1456681A GB 228873 A GB228873 A GB 228873A GB 228873 A GB228873 A GB 228873A GB 1456681 A GB1456681 A GB 1456681A
Authority
GB
United Kingdom
Prior art keywords
alarm
alarm device
relay
transistor
conductor
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
GB228873A
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.)
Pegg F R
Original Assignee
Pegg F R
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 Pegg F R filed Critical Pegg F R
Priority to GB228873A priority Critical patent/GB1456681A/en
Priority to ZA740168A priority patent/ZA74168B/en
Priority to AU64526/74A priority patent/AU489848B2/en
Publication of GB1456681A publication Critical patent/GB1456681A/en
Expired 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
    • G08B13/14—Mechanical actuation by lifting or attempted removal of hand-portable articles
    • G08B13/1445—Mechanical actuation by lifting or attempted removal of hand-portable articles with detection of interference with a cable tethering an article, e.g. alarm activated by detecting detachment of article, breaking or stretching of cable
    • G08B13/1454—Circuit arrangements thereof

Landscapes

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

Abstract

1456681 Anti-theft alarms F R PEGG 14 Jan 1974 [16 Jan 1973 17 Oct 1973] 2288/73 and 48361/73 Heading G4N An anti-theft alarm comprises a loop conductor 1 in circuit with a transistor or a semiconductor device 2 arranged to operate a switch or a relay 10 controlling an alarm device, e.g. a horn 12 or a visual indicator (not shown) when a break occurs in the conductor 1, the alarm device being maintained in operation for a period determined by a capacitor 11. The loop conductor 1 may be threaded through handles or openings in articles of merchandise. In operation, consequent to a break occurring in the conductor 1, the base of transistor 2 is no longer earthed and transistor 2 conducts to energize an alarm device 12 via the contacts of a relay 10. The alarm device 12 may be disabled before or after actuation by a key-operated switch 4. A manual switch 5 is also provided for testing the system. The alarm produced may be continuous or intermittent. In the alternative embodiment of Fig. 1 (not shown), the relay is included in the emitter circuit and the alarm is powered by a separate battery.
GB228873A 1973-01-16 1973-01-16 Loop alarm apparatus Expired GB1456681A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB228873A GB1456681A (en) 1973-01-16 1973-01-16 Loop alarm apparatus
ZA740168A ZA74168B (en) 1973-01-16 1974-01-09 Loop alarm apparatus
AU64526/74A AU489848B2 (en) 1973-01-16 1974-01-15 Loop alarm apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB228873A GB1456681A (en) 1973-01-16 1973-01-16 Loop alarm apparatus
GB4836173 1973-10-17

Publications (1)

Publication Number Publication Date
GB1456681A true GB1456681A (en) 1976-11-24

Family

ID=26237420

Family Applications (1)

Application Number Title Priority Date Filing Date
GB228873A Expired GB1456681A (en) 1973-01-16 1973-01-16 Loop alarm apparatus

Country Status (1)

Country Link
GB (1) GB1456681A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2163885A (en) * 1984-08-07 1986-03-05 David Marshall Alarm device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2163885A (en) * 1984-08-07 1986-03-05 David Marshall Alarm device

Also Published As

Publication number Publication date
AU6452674A (en) 1975-07-17

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Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee