GB214040A - Improvements relating to electric burglar alarms - Google Patents
Improvements relating to electric burglar alarmsInfo
- Publication number
- GB214040A GB214040A GB531723A GB531723A GB214040A GB 214040 A GB214040 A GB 214040A GB 531723 A GB531723 A GB 531723A GB 531723 A GB531723 A GB 531723A GB 214040 A GB214040 A GB 214040A
- Authority
- GB
- United Kingdom
- Prior art keywords
- blind
- roller
- contact
- brushes
- plates
- 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
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/02—Mechanical actuation
- G08B13/12—Mechanical actuation by the breaking or disturbance of stretched cords or wires
- G08B13/126—Mechanical actuation by the breaking or disturbance of stretched cords or wires for a housing, e.g. a box, a safe, or a room
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Burglar Alarm Systems (AREA)
Abstract
214,040. Eisler, H., and Rely-a-Bell Burglar & Fire Alarm Co., Ltd. Feb. 23, 1923. Burglar alarms.-In a burglar alarm applied to a roller blind for protecting windows, contact plates G, H on the roller A co-operate with brushes L, M to complete a closed circuit through a relay P. The blind is kept lowered by means of a hook E and, if it is displaced, so that the roller turns, the contact is broken and an alarm given. When the plates move out of contact with the brushes L, M, they move into contact with brushes W<1>, X<1> so as to short-circuit the battery Q. The blind may be composed of a continuous 45 wire led to and from between the roller and a bar F at the free end of the blind, and included in the closed circuit by having its ends connected to the plates G, H. The wire may be coated with varnish or colour to render it inconspicuous. Wires may be woven into or attached to the material of an ordinary blind, or may be combined with blinds of the type with lougitudir al members held in position by transverse cords or wires. The roller may be arranged vertically at one side of the window. Specifications 121173, 167,361, and 186,787 are referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB531723A GB214040A (en) | 1923-02-23 | 1923-02-23 | Improvements relating to electric burglar alarms |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB531723A GB214040A (en) | 1923-02-23 | 1923-02-23 | Improvements relating to electric burglar alarms |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB214040A true GB214040A (en) | 1924-04-17 |
Family
ID=9793811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB531723A Expired GB214040A (en) | 1923-02-23 | 1923-02-23 | Improvements relating to electric burglar alarms |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB214040A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2162669A (en) * | 1984-05-25 | 1986-02-05 | Michael David Woods | Improvements in or relating to alarm alert systems for buildings |
| GB2175794A (en) * | 1985-06-04 | 1986-12-10 | Peter Ross Naylor | Curtain suspension apparatus |
-
1923
- 1923-02-23 GB GB531723A patent/GB214040A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2162669A (en) * | 1984-05-25 | 1986-02-05 | Michael David Woods | Improvements in or relating to alarm alert systems for buildings |
| GB2175794A (en) * | 1985-06-04 | 1986-12-10 | Peter Ross Naylor | Curtain suspension apparatus |
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