GB487345A - Improvements in and relating to fire and temperature alarm system - Google Patents
Improvements in and relating to fire and temperature alarm systemInfo
- Publication number
- GB487345A GB487345A GB34410/36A GB3441036A GB487345A GB 487345 A GB487345 A GB 487345A GB 34410/36 A GB34410/36 A GB 34410/36A GB 3441036 A GB3441036 A GB 3441036A GB 487345 A GB487345 A GB 487345A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tubing
- fire
- causing
- circuit
- alarm
- 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
- G08B17/00—Fire alarms; Alarms responsive to explosion
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
- G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas
- G08B17/113—Constructional details
Landscapes
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fire Alarms (AREA)
- Fire-Detection Mechanisms (AREA)
Abstract
487,345. Thermal switches ; fire - alarms. SIDDALL, J., and SIDDALL, W. H. Dec. 15, 1936, No. 34410. [Class 38 (v)] [Also in Groups XXI and XXXVIII] In a fire-alarm system comprising a length of tubing 1 passing through the area to be protected and terminating in one or more diaphragm chambers or the like 7 adapted to close a bell circuit at 9, 10 when the air in the tubing expands owing to the fire, the tubing communicates with a chamber 4 containing an electric heater 6 which may be energized by a current to test the systems. This fluid system may also be combined with an electric circuit including a conductor 19 which is fixed alongside the tubing 1 preferably in the same covering 3, a battery 17 and thermal devices 20 which open when heated, by the fire and break the circuit to a relay 21 causing an alarm 25 to be sounded. To test the fluid system a switch 15 is moved over causing the current from the battery 17 to pass through the tubing 1 and the heating coil 6 causing the air to expand and close the contacts 9, 10 in an alarm circuit 12. The tubing 1 has vents 14 to allow the pressure in the tubing gradually to become equal to atmospheric pressure. In modifications the chamber 4 has two compartments connected by a small aperture and with a separate heater for each compartment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB34410/36A GB487345A (en) | 1936-12-15 | 1936-12-15 | Improvements in and relating to fire and temperature alarm system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB34410/36A GB487345A (en) | 1936-12-15 | 1936-12-15 | Improvements in and relating to fire and temperature alarm system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB487345A true GB487345A (en) | 1938-06-15 |
Family
ID=10365279
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB34410/36A Expired GB487345A (en) | 1936-12-15 | 1936-12-15 | Improvements in and relating to fire and temperature alarm system |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB487345A (en) |
-
1936
- 1936-12-15 GB GB34410/36A patent/GB487345A/en not_active Expired
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