GB651811A - Improvements relating to electric burglar alarm systems - Google Patents
Improvements relating to electric burglar alarm systemsInfo
- Publication number
- GB651811A GB651811A GB1895848A GB1895848A GB651811A GB 651811 A GB651811 A GB 651811A GB 1895848 A GB1895848 A GB 1895848A GB 1895848 A GB1895848 A GB 1895848A GB 651811 A GB651811 A GB 651811A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- alarm
- battery
- circuit
- contacts
- 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)
- Alarm Systems (AREA)
Abstract
651,811. Electrically tripped switches. RELY-A-BELL BURGLAR. & FIRE ALARM CO., Ltd. July 14, 1948, No. 18958. [Class 38(v)] [Also in Group XXXVIII] In a burglar alarm system (see Group XXXVIII) a relay 7, once operated, is held by battery 24 over a circuit including normally closed alarm contacts 23. If this circuit is broken relay 7 releases and sounds an alarm by means of its contacts 13, 14; but restoration of the circuit does not restore the conditions since battery 24 is insufficient to operate relay 7. To reset the system an alarm contact 23 is left open and relay 2 is momentarily energized from battery 18. The tongue 3 on its armature locks under a lip 5 on the armature of relay 7 and holds relay 2 in the operated condition, wherein its changeover contacts insert battery 18 in series with battery 24. On completing the alarm circuit (as on leaving the premises) relay 7 is then operated, releasing the lock on the armature of relay 2 whose contacts thereby set the circuit of relay 7 in the original " ready " condition. Specification 408,239, [Group XXXVIII], is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1895848A GB651811A (en) | 1948-07-14 | 1948-07-14 | Improvements relating to electric burglar alarm systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1895848A GB651811A (en) | 1948-07-14 | 1948-07-14 | Improvements relating to electric burglar alarm systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB651811A true GB651811A (en) | 1951-04-11 |
Family
ID=10121362
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1895848A Expired GB651811A (en) | 1948-07-14 | 1948-07-14 | Improvements relating to electric burglar alarm systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB651811A (en) |
-
1948
- 1948-07-14 GB GB1895848A patent/GB651811A/en not_active Expired
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