FR2336901A1 - Safety cutout for electric blanket - has two variable and two constant resistances forming Wheatstone bridge unbalanced at preset temperature - Google Patents
Safety cutout for electric blanket - has two variable and two constant resistances forming Wheatstone bridge unbalanced at preset temperatureInfo
- Publication number
- FR2336901A1 FR2336901A1 FR7540149A FR7540149A FR2336901A1 FR 2336901 A1 FR2336901 A1 FR 2336901A1 FR 7540149 A FR7540149 A FR 7540149A FR 7540149 A FR7540149 A FR 7540149A FR 2336901 A1 FR2336901 A1 FR 2336901A1
- Authority
- FR
- France
- Prior art keywords
- wheatstone bridge
- electric blanket
- variable
- preset temperature
- supply
- 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.)
- Granted
Links
Classifications
-
- 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
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/0252—Domestic applications
- H05B1/0272—For heating of fabrics
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C21/00—Attachments for beds, e.g. sheet holders, bed-cover holders; Ventilating, cooling or heating means in connection with bedsteads or mattresses
- A47C21/04—Devices for ventilating, cooling or heating
- A47C21/048—Devices for ventilating, cooling or heating for heating
-
- 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
- H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
- H05B3/34—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs
- H05B3/342—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs heaters used in textiles
-
- 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
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/017—Manufacturing methods or apparatus for heaters
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Control Of Resistance Heating (AREA)
Abstract
The safety cut-out automatically disconnects the supply to the electric blanket at a pre-set temperature. It comprises a Wheatstone bridge formed by two resistances (1, 2), their values increasing with temperature, and two resistances (3, 4) whose values remain constant. The supply (5, 6) is connected to two opposite terminals (7, 8) of this bridge. The remaining two terminals (9, 10) form a circuit with a negative resistance (11) and a heating resistance (12), the latter opposite a bimetal strip contact (13, 14, 15). The temperature increase causes an unbalance in the bridge, generating a secondary current and heating the bimetal strip. This strip distorts and breaks the supply to the blanket.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7540149A FR2336901A1 (en) | 1975-12-30 | 1975-12-30 | Safety cutout for electric blanket - has two variable and two constant resistances forming Wheatstone bridge unbalanced at preset temperature |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7540149A FR2336901A1 (en) | 1975-12-30 | 1975-12-30 | Safety cutout for electric blanket - has two variable and two constant resistances forming Wheatstone bridge unbalanced at preset temperature |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2336901A1 true FR2336901A1 (en) | 1977-07-29 |
FR2336901B1 FR2336901B1 (en) | 1979-07-13 |
Family
ID=9164321
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7540149A Granted FR2336901A1 (en) | 1975-12-30 | 1975-12-30 | Safety cutout for electric blanket - has two variable and two constant resistances forming Wheatstone bridge unbalanced at preset temperature |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2336901A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2590433A1 (en) * | 1985-11-20 | 1987-05-22 | Degois Cie Ets | Safety heating element intended to be used in particular in a heating cover |
WO2007065424A2 (en) * | 2005-12-11 | 2007-06-14 | W.E.T. Automotive Systems Ag | Flat heating element |
-
1975
- 1975-12-30 FR FR7540149A patent/FR2336901A1/en active Granted
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2590433A1 (en) * | 1985-11-20 | 1987-05-22 | Degois Cie Ets | Safety heating element intended to be used in particular in a heating cover |
WO2007065424A2 (en) * | 2005-12-11 | 2007-06-14 | W.E.T. Automotive Systems Ag | Flat heating element |
WO2007065424A3 (en) * | 2005-12-11 | 2007-08-09 | Wet Automotive Systems Ag | Flat heating element |
US8253071B2 (en) | 2005-12-11 | 2012-08-28 | W.E.T. Automotive Systems, Ltd. | Flat heating element |
US8525079B2 (en) | 2005-12-11 | 2013-09-03 | W.E.T. Automotive Systems Ag | Flat heating element |
Also Published As
Publication number | Publication date |
---|---|
FR2336901B1 (en) | 1979-07-13 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |