GB499692A - Improvements in heating systems - Google Patents
Improvements in heating systemsInfo
- Publication number
- GB499692A GB499692A GB7597/38A GB759738A GB499692A GB 499692 A GB499692 A GB 499692A GB 7597/38 A GB7597/38 A GB 7597/38A GB 759738 A GB759738 A GB 759738A GB 499692 A GB499692 A GB 499692A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bellows
- bar
- switch
- valve
- current
- 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
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/275—Control of temperature characterised by the use of electric means with sensing element expanding, contracting, or fusing in response to changes of temperature
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/1927—Control of temperature characterised by the use of electric means using a plurality of sensors
- G05D23/193—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces
- G05D23/1931—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces to control the temperature of one space
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Remote Sensing (AREA)
- Steam Or Hot-Water Central Heating Systems (AREA)
Abstract
499,692. Thermal switches. HOFFMAN SPECIALTY CO. March 11, 1938, No. 7597. Convention date, March 11, 1937. [Class 38 (v)] [Also in Groups XIII and XXXV] In a switch controlling the current passing through a coil 29 heating a fluid acting on a valve 28 regulating the return of water to a boiler 20, a bar 53 supported in guides above the bellows of thermostats 33, 34, is pressed by a spring 54 against a switch arm 44, and the switch is closed by the tilting of the bar when the bellows of the thermostat 34 contracts upon a fall in temperature of the return water. A current then passes through the heating coil 39 and the valve 28 is opened to allow return water to force hot water from the boiler. The valve is also closed when the bellows of the thermostat 33 contracts, and the bar is so tilted upon its support upon the other bellows. Expansion of the bellows tilts the bar to open a switch 39 in the current of the motor 26 driving a pump circulating pump.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US499692XA | 1937-03-11 | 1937-03-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB499692A true GB499692A (en) | 1939-01-27 |
Family
ID=21962706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7597/38A Expired GB499692A (en) | 1937-03-11 | 1938-03-11 | Improvements in heating systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB499692A (en) |
-
1938
- 1938-03-11 GB GB7597/38A patent/GB499692A/en not_active Expired
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