GB275128A - Improvements in burglar alarm apparatus - Google Patents
Improvements in burglar alarm apparatusInfo
- 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
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.
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)
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 |
-
1927
- 1927-04-27 GB GB1124427A patent/GB275128A/en not_active Expired
Cited By (1)
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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