GB1102346A - Alarm system - Google Patents

Alarm system

Info

Publication number
GB1102346A
GB1102346A GB4065663A GB4065663A GB1102346A GB 1102346 A GB1102346 A GB 1102346A GB 4065663 A GB4065663 A GB 4065663A GB 4065663 A GB4065663 A GB 4065663A GB 1102346 A GB1102346 A GB 1102346A
Authority
GB
United Kingdom
Prior art keywords
attached
alarm
alarm system
door
electric
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
GB4065663A
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 GB4065663A priority Critical patent/GB1102346A/en
Publication of GB1102346A publication Critical patent/GB1102346A/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
    • G08B13/22—Electrical actuation
    • G08B13/26—Electrical actuation by proximity of an intruder causing variation in capacitance or inductance of a circuit

Landscapes

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

Abstract

1,102,346. Electric alarm systems. L. R. LESTER. 19 Nov., 1964 [15 Oct., 1963], No. 40656/63. Heading G4N. An electric alarm system comprises a capacitive bridge circuit 1, 2, 3, 4, 7 which initiates an alarm signal when the capacitance 7 in one arm is varied. As described the capacitor 7 has two plates one attached to the main door 5 of a strong room and the other attached to an inner door 6 or to the door frame. The device may be applied to the protection of a cash box or a bullion car or may be utilized as a fire alarm.
GB4065663A 1963-10-15 1963-10-15 Alarm system Expired GB1102346A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4065663A GB1102346A (en) 1963-10-15 1963-10-15 Alarm system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4065663A GB1102346A (en) 1963-10-15 1963-10-15 Alarm system

Publications (1)

Publication Number Publication Date
GB1102346A true GB1102346A (en) 1968-02-07

Family

ID=10415980

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4065663A Expired GB1102346A (en) 1963-10-15 1963-10-15 Alarm system

Country Status (1)

Country Link
GB (1) GB1102346A (en)

Similar Documents

Publication Publication Date Title
GB1102346A (en) Alarm system
CA612820A (en) Intruder alarm system
CA621259A (en) Burglar alarm system
CA616363A (en) Intruder alarm system
AU281665B2 (en) Burglar alarm system
CA638501A (en) Local alarm circuit for burglar alarm system
AU4079464A (en) Burglar alarm system
AU260386B2 (en) Intruder detection system
CA663807A (en) Burglar alarm
CA664663A (en) Capacity type burglar alarm system
CA611701A (en) Burglar alarm and like warning systems
CA620511A (en) Burglar alarm
CA623298A (en) Photoelectric burglar alarm system
CA611450A (en) Intruder alarm system
AU1789862A (en) Intruder detection system
CA620581A (en) Protection for shunt capacitor banks
CA661094A (en) Alarm system
AU248170B2 (en) An improved burglar or like alarm
AU242176B2 (en) Intruder alarm systems
CA544068A (en) Circuit breaking device for electrical burglar alarm systems and the like
AU3121563A (en) Stabilization of sensitivity in intruder detection systems
CA645454A (en) Radioactive burglar alarm system
CA666082A (en) Alarm signaling system
AU6452860A (en) Intruder alarm systems
AU4258364A (en) Relay protection means fora capacitor bank