GB251103A - Improvements in automatic fire and temperature alarms - Google Patents
Improvements in automatic fire and temperature alarmsInfo
- Publication number
- GB251103A GB251103A GB1134925A GB1134925A GB251103A GB 251103 A GB251103 A GB 251103A GB 1134925 A GB1134925 A GB 1134925A GB 1134925 A GB1134925 A GB 1134925A GB 251103 A GB251103 A GB 251103A
- Authority
- GB
- United Kingdom
- Prior art keywords
- arm
- capsule
- spring
- alarm
- electromagnet
- 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
- G08B17/04—Hydraulic or pneumatic actuation of the alarm, e.g. by change of fluid pressure
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- General Physics & Mathematics (AREA)
- Fire-Detection Mechanisms (AREA)
- Fire Alarms (AREA)
Abstract
251,103. Broom, J. F., and Hamley, J. May 1, 1925. Thermal switches; cases; contacts.-In a fire alarm of the expanding capsule type, an arm f carrying the movable contact f<1> is carried by a spring arm f<2> connected to one terminal of an electric circuit, and engages the capsule e with a pressure which is variable, by means of a spring h and screw i, to vary the temperature at which the alarm operates. The capsule is removably held in guides d in the alarm casing a, which may have a hinged lid. To provide for testing the alarm, a spring plungex k can force down the second contact arm j, or an electromagnet m in an auxiliary circuit may be arranged to raise the contact arm f, the latter being of soft iron. Alternatively, the arm j may be forced down by a bell-crank lever operated bv a cord. In a modification, the pressure of the arm f on the capsule is adjusted by the action on the spring h of a cam on a rotatable spindle. In another modification, Fig. 5, the casing a is rendered air-tight for use in explosive atmospheres. The capsule e is cemented over an opening in the casing. The pressure of the arm f on the capsule is adjusted by a cam n which is rotated by a ratchet o and spring-held pawl o<1> operated by an electromagnet p which may be repeatedly energized. An electromagnet m is used for testing the alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1134925A GB251103A (en) | 1925-05-01 | 1925-05-01 | Improvements in automatic fire and temperature alarms |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1134925A GB251103A (en) | 1925-05-01 | 1925-05-01 | Improvements in automatic fire and temperature alarms |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB251103A true GB251103A (en) | 1926-04-29 |
Family
ID=9984625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1134925A Expired GB251103A (en) | 1925-05-01 | 1925-05-01 | Improvements in automatic fire and temperature alarms |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB251103A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2924388A (en) * | 1954-06-28 | 1960-02-09 | Cons Controls Corp | High temperature control apparatus |
-
1925
- 1925-05-01 GB GB1134925A patent/GB251103A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2924388A (en) * | 1954-06-28 | 1960-02-09 | Cons Controls Corp | High temperature control apparatus |
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