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 temperature

Info

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
Application number
FR7540149A
Other languages
French (fr)
Other versions
FR2336901B1 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to FR7540149A priority Critical patent/FR2336901A1/en
Publication of FR2336901A1 publication Critical patent/FR2336901A1/en
Application granted granted Critical
Publication of FR2336901B1 publication Critical patent/FR2336901B1/fr
Granted legal-status Critical Current

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.
FR7540149A 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 Granted FR2336901A1 (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (5)

* Cited by examiner, † Cited by third party
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