GB275128A - Improvements in burglar alarm apparatus - Google Patents

Improvements in burglar alarm apparatus

Info

Publication number
GB275128A
GB275128A GB1124427A GB1124427A GB275128A GB 275128 A GB275128 A GB 275128A GB 1124427 A GB1124427 A GB 1124427A GB 1124427 A GB1124427 A GB 1124427A GB 275128 A GB275128 A GB 275128A
Authority
GB
United Kingdom
Prior art keywords
circuit
alarm
relay
auxiliary
armature
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
GB1124427A
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.)
MARCUS WILLIAM WAKEFIELD
PERCIVAL ADOLPHUS WAKEFIELD
Original Assignee
MARCUS WILLIAM WAKEFIELD
PERCIVAL ADOLPHUS WAKEFIELD
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 MARCUS WILLIAM WAKEFIELD, PERCIVAL ADOLPHUS WAKEFIELD filed Critical MARCUS WILLIAM WAKEFIELD
Priority to GB1124427A priority Critical patent/GB275128A/en
Publication of GB275128A publication Critical patent/GB275128A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G08B25/008—Alarm setting and unsetting, i.e. arming or disarming of the security system

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

275,128. Wakefield, M. W., and Wakefield, P. A. April 27, 1927. Burglar alarms.- In a closed-circuit constantcurrent system of the type in which an auxiliary closed-circuit is provided, the auxiliary alarm circuit is arranged to be in reserve to actuate the alarm if the normal alarm circuit is tampered with. The circuit f of the alarm device h is held open by a relay c in the protective circuit a, or auxiliary circuit y, f, which may be connected to the same battery g, energizing a relay v to complete the circuit f through an armature u. Should the circuit f be tampered with, the circuit y is broken, and the armature u closes an .auxiliary alarm circuit s having a separate battery t. The frame c<1> of the relay c may be connected in the circuit y and the relay and the alarm may be protected by casings g, respectively in the circuit a. For resetting, a lever m is pulled by hand to engage a hook n, thus establishing a shunt l, p across the relay terminals d, i. This shunt is completed by a switch k on the closing of a final exit door, the armature d is attracted, and the lever m is released by the attraction of the hook n by a coil o. The alarm may be rendered ineffective during the day-time by a switch j.
GB1124427A 1927-04-27 1927-04-27 Improvements in burglar alarm apparatus Expired GB275128A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1124427A GB275128A (en) 1927-04-27 1927-04-27 Improvements in burglar alarm apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1124427A GB275128A (en) 1927-04-27 1927-04-27 Improvements in burglar alarm apparatus

Publications (1)

Publication Number Publication Date
GB275128A true GB275128A (en) 1927-08-04

Family

ID=9982646

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1124427A Expired GB275128A (en) 1927-04-27 1927-04-27 Improvements in burglar alarm apparatus

Country Status (1)

Country Link
GB (1) GB275128A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2217493A (en) * 1988-03-17 1989-10-25 James David Guilliatt Line sensing self actuating bell unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2217493A (en) * 1988-03-17 1989-10-25 James David Guilliatt Line sensing self actuating bell unit

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