WO2008099134A1 - Temperature sensor for radiant electric heaters - Google Patents

Temperature sensor for radiant electric heaters Download PDF

Info

Publication number
WO2008099134A1
WO2008099134A1 PCT/GB2008/000243 GB2008000243W WO2008099134A1 WO 2008099134 A1 WO2008099134 A1 WO 2008099134A1 GB 2008000243 W GB2008000243 W GB 2008000243W WO 2008099134 A1 WO2008099134 A1 WO 2008099134A1
Authority
WO
WIPO (PCT)
Prior art keywords
temperature sensor
expansion element
abutment member
expansion
switch arm
Prior art date
Application number
PCT/GB2008/000243
Other languages
French (fr)
Inventor
Kevin Ronald Mcwilliams
Original Assignee
Ceramaspeed Limited
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 Ceramaspeed Limited filed Critical Ceramaspeed Limited
Publication of WO2008099134A1 publication Critical patent/WO2008099134A1/en

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
    • H05B1/0202—Switches
    • H05B1/0216—Switches actuated by the expansion of a solid element, e.g. wire or rod
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/46—Thermally-sensitive members actuated due to expansion or contraction of a solid
    • H01H37/48—Thermally-sensitive members actuated due to expansion or contraction of a solid with extensible rigid rods or tubes

Definitions

  • This invention relates to a temperature sensor for a radiant electric heater.
  • Temperature sensors for radiant electric heaters especially those used in cooking hobs, generally comprise a differential expansion member which is connected to a housing in such a manner that an element of the differential expansion member is adapted to operate a snap switch as a result of expansion and contraction of the differential expansion member.
  • the expansion member comprises a metal tube enclosing a rod of ceramic material, the two elements being secured together in the region of the ends thereof remote from a housing.
  • the tube is secured in the housing such that expansion and contraction of the expansion member results in axial movement of the rod within the housing.
  • An arm of a snap switch is clamped between the end of the rod and a resilient assembly so as to reduce the risk of early failure of the snap switch as a result of fatigue.
  • the resilient assembly acts in the axial direction of the rod and comprises a coil spring which extends around a support which acts on the arm of the snap switch by way of a spring plate.
  • a disadvantage of this arrangement is that the coil spring, the support and the spring plate are all guided by a buttress within the housing or by a carrier for a further arm of the snap switch.
  • the need to support the components of the resilient assembly gives rise to friction between the resilient assembly and its support. Such friction can give rise to unreliable switching.
  • a temperature sensor for a radiant electric heater comprising: a switch housing;
  • a second expansion element mounted at its free end with a free end of the first expansion element such that the free ends of the two elements are immovable relative to each other, the first and second expansion elements having different coefficients of thermal expansion;
  • a snap switch disposed within the housing and including a switch arm
  • the abutment member including means for receiving the end of the second expansion element and means for engaging with biasing means acting between the housing and the abutment means so as to urge the abutment member towards the switch arm for controlling actuation thereof, wherein the end of the second expansion element and the abutment member engage with the biasing means by way of an aperture provided in the switch arm of the snap switch.
  • the first expansion element may be in the form of a tube and the second expansion element may be in the form of a rod arranged within the tube.
  • the first expansion element may be made of a metallic material.
  • the second expansion element may be made of a ceramic, glass or metal having lower thermal expansion that the first expansion element.
  • the end of the second expansion element may pass through the aperture provided in the switch arm.
  • the abutment member may pass through the aperture provided in the switch arm.
  • the abutment member may include a cylindrical projection extending in an axial direction towards the end of the second expansion element.
  • a spacer may be provided between the end of the second expansion element and the abutment member, the spacer passing through the aperture in the switch arm.
  • the spacer may include a cylindrical portion extending in an axial direction of the second expansion element in a direction away therefrom.
  • the spacer may include a cup for receiving the end of the second expansion element within the housing.
  • the spacer may include a flange having a greater diameter than the diameter of the aperture of the switch arm.
  • the switch arm may be formed with a substantially V-shaped deformation which extends away from the free end of the second expansion element.
  • the substantially V-shaped deformation may be provided in the region of the aperture in the switch arm.
  • the substantially V-shaped deformation may form an articulation point for the switch arm.
  • the abutment member may include a cup for receiving the end of the second expansion element.
  • the abutment member may include a flange for engaging with the switch arm for controlling actuation thereof, the flange having a greater diameter than the diameter of the aperture in the switch arm.
  • the biasing means may comprise a spring, such as a coil spring coaxial with the second expansion element.
  • the coil spring may pass over a cylindrical projection provided on the abutment member.
  • the cylindrical projection may be coaxial with the second expansion member.
  • the biasing means may be positioned in a recess formed in the housing.
  • Figure 1 is a diagrammatic illustration of one embodiment of a temperature sensor according to the present invention.
  • Figure 2 is a perspective view of part of the temperature sensor of Figure 1 ;
  • Figure 3 is a diagrammatic illustration of a modification of part of the temperature sensor of Figure 1 ;
  • Figure 4 is a perspective view of part of the temperature sensor of Figure 3;
  • Figure 5 is a diagrammatic illustration of another modification of part of the temperature sensor shown in Figure 1 ;
  • Figure 6 is a perspective view of part of the temperature sensor of Figure 5.
  • the temperature sensor shown in Figures 1 and 2 comprises a differential expansion member 1 in the form if two elongate expansion elements 3, 5 which have significantly different coefficients of thermal expansion.
  • expansion element 3 may comprise a tube of metallic material of relatively high coefficient of thermal expansion
  • expansion element 5 may comprise a rod of ceramic material of relatively low coefficient of thermal expansion.
  • the free ends of the expansion elements 3 and 5 are mounted together in such a manner that they cannot move relative to each other.
  • the other end of the expansion element 3 is secured within a housing 7, while the other end of the expansion element 5 is free to move. Consequently the ends of the differential expansion member within the housing 7 move relative to each other, in the axial direction of the member 1 , as the expansion member is heated and cooled, with the result that the end of the rod-form expansion element 5 moves outwardly relative to the housing as the expansion member is heated and moves inwardly relative to the housing as the expansion member is cooled.
  • the end of the rod-form expansion element 5 within the housing 7 passes through an aperture formed in an actuating arm 9 of a snap switch 11 , the snap switch also including a reaction arm 13 which creates the snap effect of a contact 15.
  • Contact 15 makes or breaks with a counter contact 17 so as to control the supply of electrical power to a radiant electric heater of which the temperature sensor forms a part in a manner well known to the skilled person.
  • the actuating arm 9 of the snap switch is formed with an articulation point 19 in the form of a substantially V-shaped deformation with the apex of the deformation being directed away from the end of the rod-form expansion element 5.
  • the end of the rod-form expansion element 5 within the housing 7 is received in an abutment member 21 which includes a cup 23 dimensioned to receive the end of the expansion element, an external annular flange 25 and a cylindrical protrusion 27 which is coaxial with the expansion element 5.
  • the diameter of the flange 25 is greater than the diameter of the aperture in the actuating arm 9 of the snap switch.
  • a coil spring 29 is positioned between the abutment member 21 and the housing 7 so as to urge the actuating arm 9 of the snap switch towards the end of the expansion element 5.
  • the coil spring is dimensioned such that one end fits over the cylindrical protrusion of the abutment member 21 and to engage with the annular flange 25.
  • the other end of the coil spring 29 is received in a recess 31 formed in a wall of the housing 7.
  • the rod-form expansion element 5 passes freely through the actuating arm 9 of the snap switch 11 and is supported at its end within the housing 7 by the abutment member 21 and the coil spring 29, thereby minimising any frictional forces which might inhibit operation of the snap switch.
  • Figures 3 and 4 show a modification of the temperature sensor of Figures 1 and 2 and the same references are used to identify the same or similar components.
  • the abutment member instead of the end of the rod-form expansion element 5 within the housing 7 passing through the actuating arm 9 of the snap switch 11 , the abutment member is formed with a cylindrical protrusion 33 which extends towards the end of the expansion element 5 and passes through an aperture formed in the actuating arm 9.
  • the cup 23 for receiving the end of the expansion element 5 is formed in the end of the cylindrical protrusion 33.
  • FIGS 5 and 6 show an alternative modification of the temperature sensor of Figures 1 and 2 and again the same references are used to denote the same or similar components.
  • a spacer 35 is arranged between the end of the rod-form expansion element 5 and the abutment member 21.
  • the spacer 35 includes a cylindrical portion 37 which passes through an aperture formed in the actuating arm 9 of the snap switch 11 and engages in the cup 23 formed in the end of the abutment member 21.
  • the spacer 35 also includes an enlarged diameter portion forming a flange 39 which is formed with a cup 41 which receives the end of the rod-form expansion element 5.
  • the actuating arm 9 of the snap switch 11 is positioned between the two flanges 25 and 39.
  • the diameter of the flange 39 is greater than the diameter of the aperture in the actuating arm 9 of the snap switch 11.

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Thermally Actuated Switches (AREA)

Abstract

A temperature sensor for a radiant electric heater, the sensor comprises a switch housing (7), a first expansion element (3) secured at one end thereof to the housing, and a second expansion element (5) mounted at its free end with a free end of the first expansion element such that the free ends of the two elements are immovable relative to each other, the first and second expansion elements having different coefficients of thermal expansion. A snap switch (11) is disposed within the housing and including a switch arm (9). An abutment member (21) is axially aligned with the second expansion element, the abutment member including means (23) for receiving the end of the second expansion element and means for engaging with biasing means (29) acting between the housing and the abutment means so as to urge the abutment member towards the switch arm for controlling actuation thereof. In this way, the end of the second expansion element and the abutment member engage with the biasing means by way of an aperture provided in the switch arm of the snap switch.

Description

TEMPERATURE SENSOR FOR RADIANT ELECTRIC HEATERS
This invention relates to a temperature sensor for a radiant electric heater.
Temperature sensors for radiant electric heaters, especially those used in cooking hobs, generally comprise a differential expansion member which is connected to a housing in such a manner that an element of the differential expansion member is adapted to operate a snap switch as a result of expansion and contraction of the differential expansion member.
Such a temperature sensor is described in US-A-20050184849 in which the expansion member comprises a metal tube enclosing a rod of ceramic material, the two elements being secured together in the region of the ends thereof remote from a housing. The tube is secured in the housing such that expansion and contraction of the expansion member results in axial movement of the rod within the housing. An arm of a snap switch is clamped between the end of the rod and a resilient assembly so as to reduce the risk of early failure of the snap switch as a result of fatigue. The resilient assembly acts in the axial direction of the rod and comprises a coil spring which extends around a support which acts on the arm of the snap switch by way of a spring plate.
A disadvantage of this arrangement is that the coil spring, the support and the spring plate are all guided by a buttress within the housing or by a carrier for a further arm of the snap switch. In each case, the need to support the components of the resilient assembly gives rise to friction between the resilient assembly and its support. Such friction can give rise to unreliable switching.
It is therefore an object of the present invention to provide a temperature sensor which overcomes or at least ameliorates the above disadvantage.
According to the present invention there is provided a temperature sensor for a radiant electric heater, the sensor comprising: a switch housing;
a first expansion element secured at one end thereof to the housing;
a second expansion element mounted at its free end with a free end of the first expansion element such that the free ends of the two elements are immovable relative to each other, the first and second expansion elements having different coefficients of thermal expansion;
a snap switch disposed within the housing and including a switch arm; and
an abutment member axially aligned with the second expansion element, the abutment member including means for receiving the end of the second expansion element and means for engaging with biasing means acting between the housing and the abutment means so as to urge the abutment member towards the switch arm for controlling actuation thereof, wherein the end of the second expansion element and the abutment member engage with the biasing means by way of an aperture provided in the switch arm of the snap switch.
The first expansion element may be in the form of a tube and the second expansion element may be in the form of a rod arranged within the tube.
The first expansion element may be made of a metallic material. The second expansion element may be made of a ceramic, glass or metal having lower thermal expansion that the first expansion element.
The end of the second expansion element may pass through the aperture provided in the switch arm.
Alternatively, the abutment member may pass through the aperture provided in the switch arm. In such a case, the abutment member may include a cylindrical projection extending in an axial direction towards the end of the second expansion element.
As a further alternative, a spacer may be provided between the end of the second expansion element and the abutment member, the spacer passing through the aperture in the switch arm. The spacer may include a cylindrical portion extending in an axial direction of the second expansion element in a direction away therefrom. The spacer may include a cup for receiving the end of the second expansion element within the housing. The spacer may include a flange having a greater diameter than the diameter of the aperture of the switch arm.
The switch arm may be formed with a substantially V-shaped deformation which extends away from the free end of the second expansion element. The substantially V-shaped deformation may be provided in the region of the aperture in the switch arm. The substantially V-shaped deformation may form an articulation point for the switch arm.
The abutment member may include a cup for receiving the end of the second expansion element.
The abutment member may include a flange for engaging with the switch arm for controlling actuation thereof, the flange having a greater diameter than the diameter of the aperture in the switch arm.
The biasing means may comprise a spring, such as a coil spring coaxial with the second expansion element. The coil spring may pass over a cylindrical projection provided on the abutment member. The cylindrical projection may be coaxial with the second expansion member. The biasing means may be positioned in a recess formed in the housing. For a better understanding of the present invention and to show more clearly how it may be carried into effect reference will now be made, by way of example, to the accompanying drawings in which:
Figure 1 is a diagrammatic illustration of one embodiment of a temperature sensor according to the present invention;
Figure 2 is a perspective view of part of the temperature sensor of Figure 1 ;
Figure 3 is a diagrammatic illustration of a modification of part of the temperature sensor of Figure 1 ;
Figure 4 is a perspective view of part of the temperature sensor of Figure 3;
Figure 5 is a diagrammatic illustration of another modification of part of the temperature sensor shown in Figure 1 ; and
Figure 6 is a perspective view of part of the temperature sensor of Figure 5.
The temperature sensor shown in Figures 1 and 2 comprises a differential expansion member 1 in the form if two elongate expansion elements 3, 5 which have significantly different coefficients of thermal expansion. In particular, expansion element 3 may comprise a tube of metallic material of relatively high coefficient of thermal expansion, while expansion element 5 may comprise a rod of ceramic material of relatively low coefficient of thermal expansion.
The free ends of the expansion elements 3 and 5 are mounted together in such a manner that they cannot move relative to each other. The other end of the expansion element 3 is secured within a housing 7, while the other end of the expansion element 5 is free to move. Consequently the ends of the differential expansion member within the housing 7 move relative to each other, in the axial direction of the member 1 , as the expansion member is heated and cooled, with the result that the end of the rod-form expansion element 5 moves outwardly relative to the housing as the expansion member is heated and moves inwardly relative to the housing as the expansion member is cooled.
The end of the rod-form expansion element 5 within the housing 7 passes through an aperture formed in an actuating arm 9 of a snap switch 11 , the snap switch also including a reaction arm 13 which creates the snap effect of a contact 15. Contact 15 makes or breaks with a counter contact 17 so as to control the supply of electrical power to a radiant electric heater of which the temperature sensor forms a part in a manner well known to the skilled person.
At the point where the rod-form expansion element 5 passes through the actuating arm 9 of the snap switch, that is in the region of the aperture, the actuating arm is formed with an articulation point 19 in the form of a substantially V-shaped deformation with the apex of the deformation being directed away from the end of the rod-form expansion element 5.
The end of the rod-form expansion element 5 within the housing 7 is received in an abutment member 21 which includes a cup 23 dimensioned to receive the end of the expansion element, an external annular flange 25 and a cylindrical protrusion 27 which is coaxial with the expansion element 5. The diameter of the flange 25 is greater than the diameter of the aperture in the actuating arm 9 of the snap switch. A coil spring 29 is positioned between the abutment member 21 and the housing 7 so as to urge the actuating arm 9 of the snap switch towards the end of the expansion element 5. The coil spring is dimensioned such that one end fits over the cylindrical protrusion of the abutment member 21 and to engage with the annular flange 25. The other end of the coil spring 29 is received in a recess 31 formed in a wall of the housing 7.
Consequently, the rod-form expansion element 5 passes freely through the actuating arm 9 of the snap switch 11 and is supported at its end within the housing 7 by the abutment member 21 and the coil spring 29, thereby minimising any frictional forces which might inhibit operation of the snap switch.
As the temperature sensed by the differential expansion member 1 increases the tube 3 expands more than the rod 5 and the end of the rod 5 within the housing
7 moves away from the coil spring 29 with the result that the flange 25 of the abutment member 21 engages with the articulating point 19 of the actuating arm
9 so as to cause the snap switch to operate and the contacts 15 and 17 to separate. As the sensed temperature decreases the snap switch operates in reverse.
Figures 3 and 4 show a modification of the temperature sensor of Figures 1 and 2 and the same references are used to identify the same or similar components. In Figures 3 and 4, instead of the end of the rod-form expansion element 5 within the housing 7 passing through the actuating arm 9 of the snap switch 11 , the abutment member is formed with a cylindrical protrusion 33 which extends towards the end of the expansion element 5 and passes through an aperture formed in the actuating arm 9. The cup 23 for receiving the end of the expansion element 5 is formed in the end of the cylindrical protrusion 33.
Figures 5 and 6 show an alternative modification of the temperature sensor of Figures 1 and 2 and again the same references are used to denote the same or similar components.
In Figures 5 and 6, instead of the end of the rod-form expansion element 5 within the housing 7 passing through the actuating arm 9 of the snap switch 11 to engage with abutment member 21 , a spacer 35 is arranged between the end of the rod-form expansion element 5 and the abutment member 21. The spacer 35 includes a cylindrical portion 37 which passes through an aperture formed in the actuating arm 9 of the snap switch 11 and engages in the cup 23 formed in the end of the abutment member 21. The spacer 35 also includes an enlarged diameter portion forming a flange 39 which is formed with a cup 41 which receives the end of the rod-form expansion element 5. In the case of Figures 5 and 6, the actuating arm 9 of the snap switch 11 is positioned between the two flanges 25 and 39. The diameter of the flange 39 is greater than the diameter of the aperture in the actuating arm 9 of the snap switch 11.

Claims

1. A temperature sensor fora radiant electric heater, the sensor comprising:
a switch housing (7);
a first expansion element (3) secured at one end thereof to the housing;
a second expansion element (5) mounted at its free end with a free end of the first expansion element such that the free ends of the two elements are immovable relative to each other, the first and second expansion elements having different coefficients of thermal expansion;
a snap switch (11 ) disposed within the housing and including a switch arm (9); and
an abutment member (21 ) axially aligned with the second expansion element, the abutment member including means (23) for receiving the end of the second expansion element and means for engaging with biasing means (29) acting between the housing and the abutment means so as to urge the abutment member towards the switch arm for controlling actuation thereof, wherein the end of the second expansion element and the abutment member engage with the biasing means by way of an aperture provided in the switch arm of the snap switch.
2. A temperature sensor as claimed in claim 1 , characterised in that the first expansion element (3) is in the form of a tube and the second expansion element (5) is in the form of a rod arranged within the tube.
3. A temperature sensor as claimed in claim 1 or 2, characterised in that the first expansion element (3) is made of a metallic material.
4. A temperature sensor as claimed in claim 3, characterised in that the second expansion element (5) is selected from a ceramic, glass, and metal having lower thermal expansion that the first expansion element (3).
5. A temperature sensor as claimed in any preceding claim, characterised in that the end of the second expansion element (5) passes through the aperture provided in the switch arm (9).
6. A temperature sensor as claimed in any one of claims 1 to 4, characterised in that the abutment member (21 ) passes through the aperture provided in the switch arm (9).
7. A temperature sensor as claimed in claim 6, characterised in that the abutment member (21 ) includes a cylindrical projection (33) extending in an axial direction towards the end of the second expansion element (5).
8. , A temperature sensor as claimed in any one of claims 1 to 4, characterised in that a spacer (35) is provided between the end of the second expansion element (5) and the abutment member (21 ), the spacer passing through the aperture in the switch arm (9).
9. A temperature sensor as claimed in claim 8, characterised in that the spacer (35) includes a cylindrical portion (37) extending in an axial direction of the second expansion element (5) in a direction away therefrom.
10. A temperature sensor as claimed in claim 8 or 9, characterised in that the spacer (35) includes a cup (41 ) for receiving the end of the second expansion element (5) within the housing.
11. A temperature sensor as claimed in claim 8, 9 or 10, characterised in that the spacer (35) includes a flange (39) having a greater diameter than the diameter of the aperture of the switch arm (9).
12. A temperature sensor as claimed in any preceding claim, characterised in that the switch arm (9) is formed with a substantially V-shaped deformation (19) which extends away from the free end of the second expansion element (5).
13. A temperature sensor as claimed in claim 12, characterised in that the substantially V-shaped deformation (19) is provided in the region of the aperture in the switch arm (9).
14. A temperature sensor as claimed in claim 12 or 13, characterised in that the substantially V-shaped deformation (19) forms an articulation point for the switch arm (9).
15. A temperature sensor as claimed in any preceding claim, characterised in that the abutment member (21 ) includes a cup for receiving the end of the second expansion element (5).
16. A temperature sensor as claimed in any preceding claim, characterised in that the abutment member (21 ) includes a flange (25) for engaging with the switch arm (9) for controlling actuation thereof, the flange having a greater diameter than the diameter of the aperture in the switch arm.
17. A temperature sensor as claimed in any preceding claim, characterised in that the biasing means (29) comprises a spring.
18. A temperature sensor as claimed in claim 17, characterised in that the spring (29) comprises a coil spring coaxial with the second expansion element (5).
19. A temperature sensor as claimed in claim 18, characterised in that the coil spring (29) passes over a cylindrical projection (27) provided on the abutment member (21).
20. A temperature sensor as claimed in claim 19, characterised in that the cylindrical projection (27) is coaxial with the second expansion member (5).
21. A temperature sensor as claimed in any preceding claim, characterised in that the biasing means (29) is positioned in a recess formed in the housing (7).
PCT/GB2008/000243 2007-02-13 2008-01-24 Temperature sensor for radiant electric heaters WO2008099134A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0702738.6 2007-02-13
GB0702738A GB0702738D0 (en) 2007-02-13 2007-02-13 Temperature sensor

Publications (1)

Publication Number Publication Date
WO2008099134A1 true WO2008099134A1 (en) 2008-08-21

Family

ID=37899207

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2008/000243 WO2008099134A1 (en) 2007-02-13 2008-01-24 Temperature sensor for radiant electric heaters

Country Status (2)

Country Link
GB (1) GB0702738D0 (en)
WO (1) WO2008099134A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0884927A2 (en) * 1997-06-12 1998-12-16 E.G.O. ELEKTRO-GERÄTEBAU GmbH Switching element for electrical appliances, such as electrical heaters
EP1223597A1 (en) * 2001-01-10 2002-07-17 Electrovac, Fabrikation Elektrotechnischer Spezialartikel Gesellschaft M.B.H. Temperature limiter
WO2003038849A1 (en) * 2001-10-29 2003-05-08 Thermowatt S.P.A. Safety thermo-protector designed in particular for electric water boilers
US20050184849A1 (en) * 2004-02-24 2005-08-25 Electrovac, Fabrikation Elektrotechnischer Spezialartikel Ges.M.B.H. Temperature sensor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0884927A2 (en) * 1997-06-12 1998-12-16 E.G.O. ELEKTRO-GERÄTEBAU GmbH Switching element for electrical appliances, such as electrical heaters
EP1223597A1 (en) * 2001-01-10 2002-07-17 Electrovac, Fabrikation Elektrotechnischer Spezialartikel Gesellschaft M.B.H. Temperature limiter
WO2003038849A1 (en) * 2001-10-29 2003-05-08 Thermowatt S.P.A. Safety thermo-protector designed in particular for electric water boilers
US20050184849A1 (en) * 2004-02-24 2005-08-25 Electrovac, Fabrikation Elektrotechnischer Spezialartikel Ges.M.B.H. Temperature sensor

Also Published As

Publication number Publication date
GB0702738D0 (en) 2007-03-21

Similar Documents

Publication Publication Date Title
JPS63252376A (en) Temperature limiter
US7345572B2 (en) Temperature sensor
EP0552860B1 (en) Device for controlling or limiting temperature in an electric cooking appliance
US9666394B2 (en) Heat sensor
US4695816A (en) Thermal cut-out
JPS5922332B2 (en) thermostat
EP2183758B1 (en) Temperature sensor
US5029303A (en) Switching device
WO2008099134A1 (en) Temperature sensor for radiant electric heaters
US10332706B2 (en) Bimetal controller
PL187381B1 (en) Power control unit
GB2156157A (en) Dual temperature thermostat
US5585774A (en) Condition-responsive electric switch mechanism
WO2004019360A1 (en) Method and apparatus for actuating a switching device using magnets
EP0425752B1 (en) An electric adjustable thermostat with temperature compensation
WO2008093051A1 (en) Temperature sensor for radiant electric heaters
US11054051B2 (en) Gas shut-off valve for a gas cooking appliance and gas cooking appliance incorporating said gas shut-off valve
CA1097395A (en) Expansion box temperature regulator for electric appliances
US5311165A (en) Modular electric/gas oven thermostat and assembly method
US5576683A (en) Thermostat with thermal insulator for protection against overheating
WO2008093052A1 (en) Temperature sensor for radiant electric heaters
CN108013772B (en) Coil disc subassembly and cooking utensil that has it
US4604603A (en) Dual temperature thermostat
US3235691A (en) Temperature responsive slip friction switch
US3051807A (en) Thermoresponsive switch mechanism

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 08701917

Country of ref document: EP

Kind code of ref document: A1

DPE2 Request for preliminary examination filed before expiration of 19th month from priority date (pct application filed from 20040101)
NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 08701917

Country of ref document: EP

Kind code of ref document: A1