GB1479825A - Fail-safe thermostat - Google Patents
Fail-safe thermostatInfo
- Publication number
- GB1479825A GB1479825A GB1388375A GB1388375A GB1479825A GB 1479825 A GB1479825 A GB 1479825A GB 1388375 A GB1388375 A GB 1388375A GB 1388375 A GB1388375 A GB 1388375A GB 1479825 A GB1479825 A GB 1479825A
- Authority
- GB
- United Kingdom
- Prior art keywords
- switch
- spring
- diaphragm
- arm
- april
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
- H01H35/26—Details
- H01H35/2671—Means to detect leaks in the pressure sensitive element
-
- 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
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/0019—Circuit arrangements
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Control Of Resistance Heating (AREA)
- Control Of Temperature (AREA)
- Thermally Actuated Switches (AREA)
- Safety Devices In Control Systems (AREA)
Abstract
1479825 Thermal switches WESTING- HOUSE ELECTRIC CORP 4 April 1975 [11 April 1974] 13883/75 Heading H1N A snap action thermal switch includes a fail safe device 70 for opening the switch when the temperature responsive means 27 for controlling the cyclic opening and closing of the switch fails to operate and when excess movement of the temperature responsive means 27 occurs in one direction. In a switch of the type described in Specifications 1,315,089 and 1,410,214, a C-shaped spring 70 is positioned between the pressure diaphragm 27 and the spring arm 20 carrying the bridging contacts 18. One end of the spring 70 is positioned below an adjusting screw 78 mounted on a bracket 74 connected to the arm 20. In the absence of hydraulic pressure behind the diaphragm 27, the spring 70 pushes back the diaphragm 27 and lifts the arm 20 to open the switch. The switch is also opened by the spring 70 if the ambient temperature falls below a predetermined level, e.g. 50 F. The diaphragm 27 may be replaced by a bimetallic mechanism, a bourdon tube or a differential expansion device.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US46025374 US3924142A (en) | 1974-04-11 | 1974-04-11 | Fail-safe control |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1479825A true GB1479825A (en) | 1977-07-13 |
Family
ID=23827956
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1388375A Expired GB1479825A (en) | 1974-04-11 | 1975-04-04 | Fail-safe thermostat |
Country Status (8)
Country | Link |
---|---|
US (1) | US3924142A (en) |
JP (1) | JPS50140667A (en) |
CA (1) | CA1031399A (en) |
ES (1) | ES436405A1 (en) |
GB (1) | GB1479825A (en) |
IT (1) | IT1029063B (en) |
PH (1) | PH11016A (en) |
ZA (1) | ZA751492B (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2815987C2 (en) * | 1978-04-13 | 1986-02-06 | E.G.O. Elektro-Geräte AG, Zug | Temperature controller |
US4825047A (en) * | 1987-05-07 | 1989-04-25 | Thermafoil Products Inc. | Temperature-responsive controller for waterbed mattress heaters |
US6525298B1 (en) * | 2001-10-01 | 2003-02-25 | Barney D. Hunts | Towel warmer |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2686250A (en) * | 1951-11-02 | 1954-08-10 | Gen Electric | Electric heating apparatus |
-
1973
- 1973-04-08 PH PH17037A patent/PH11016A/en unknown
-
1974
- 1974-04-11 US US46025374 patent/US3924142A/en not_active Expired - Lifetime
-
1975
- 1975-03-11 ZA ZA00751492A patent/ZA751492B/en unknown
- 1975-03-17 CA CA222,250A patent/CA1031399A/en not_active Expired
- 1975-04-04 GB GB1388375A patent/GB1479825A/en not_active Expired
- 1975-04-08 ES ES436405A patent/ES436405A1/en not_active Expired
- 1975-04-09 IT IT4158175A patent/IT1029063B/en active
- 1975-04-11 JP JP4348875A patent/JPS50140667A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
IT1029063B (en) | 1979-03-10 |
AU7983975A (en) | 1976-10-07 |
ES436405A1 (en) | 1977-04-01 |
PH11016A (en) | 1977-10-25 |
JPS50140667A (en) | 1975-11-11 |
CA1031399A (en) | 1978-05-16 |
ZA751492B (en) | 1976-02-25 |
US3924142A (en) | 1975-12-02 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |