GB1242345A - Improvements in or relating to intruder alarm systems - Google Patents

Improvements in or relating to intruder alarm systems

Info

Publication number
GB1242345A
GB1242345A GB1050569A GB1050569A GB1242345A GB 1242345 A GB1242345 A GB 1242345A GB 1050569 A GB1050569 A GB 1050569A GB 1050569 A GB1050569 A GB 1050569A GB 1242345 A GB1242345 A GB 1242345A
Authority
GB
United Kingdom
Prior art keywords
alarm
systems
circuitry
responsive
premises
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
GB1050569A
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.)
American District Telegraph Co
Original Assignee
American District Telegraph Co
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 American District Telegraph Co filed Critical American District Telegraph Co
Publication of GB1242345A publication Critical patent/GB1242345A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/0297—Robbery alarms, e.g. hold-up alarms, bag snatching alarms

Abstract

1,242,345. Alarm systems. AMERICAN DISTRICT TELEGRAPH CO. 27 Feb., 1969 [5 April, 1968], No. 10505/69. Headings G4H and G4N. [Also in Division H3] In a burglar alarm system a manual switch H1, H2 (shown in the inoperative position) in protected premises 11 actuates a astable multivibrator Q2, Q3 controlling an electronic switch Q1 to send pulses along a line 12 to a central station 10 comprising a battery 15 and alarm means 13. An open circuit in the path ABCD is prevented from causing a false alarm by diodes D6, D7, D8 which prevent operation of the multivibrator. A tone generator 20 and a tone responsive device 16 indicate earths or open circuits in the circuitry. A Zener diode D10 protects the circuitry from excess voltages. An alarm bell or lamp may be connected between 19 and 22 at premises 11. Automatic burglar alarm devices may be provided at 18, which may comprise door and window contacts, foil, photo-electric beams, sound-responsive systems, or capacitive responsive systems.
GB1050569A 1968-04-05 1969-02-27 Improvements in or relating to intruder alarm systems Expired GB1242345A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US71914568A 1968-04-05 1968-04-05

Publications (1)

Publication Number Publication Date
GB1242345A true GB1242345A (en) 1971-08-11

Family

ID=24888910

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1050569A Expired GB1242345A (en) 1968-04-05 1969-02-27 Improvements in or relating to intruder alarm systems

Country Status (5)

Country Link
US (1) US3587082A (en)
BE (1) BE726515A (en)
FR (1) FR1600294A (en)
GB (1) GB1242345A (en)
NL (1) NL144411B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3699569A (en) * 1972-01-28 1972-10-17 Minnesota Mining & Mfg Security system for indicating fire, intrusion or the like
US3828334A (en) * 1973-04-13 1974-08-06 Univ Iowa State Res Found Inc System for remote monitoring of tower lighting system
US3982242A (en) * 1975-09-23 1976-09-21 Honeywell Inc. McCulloh receiver
US5764133A (en) * 1996-12-02 1998-06-09 Pullins; Leonard M. Anti-robbery security switch system

Also Published As

Publication number Publication date
US3587082A (en) 1971-06-22
DE1907585B2 (en) 1972-08-24
BE726515A (en) 1969-07-07
FR1600294A (en) 1970-07-20
NL144411B (en) 1974-12-16
DE1907585A1 (en) 1970-04-30
NL6902226A (en) 1969-10-07

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