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WO2004066682A1 - Radiant electric heater - Google Patents

Radiant electric heater Download PDF

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Publication number
WO2004066682A1
WO2004066682A1 PCT/GB2004/000142 GB2004000142W WO2004066682A1 WO 2004066682 A1 WO2004066682 A1 WO 2004066682A1 GB 2004000142 W GB2004000142 W GB 2004000142W WO 2004066682 A1 WO2004066682 A1 WO 2004066682A1
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WO
WIPO (PCT)
Prior art keywords
heater
heating element
region
supported
base
Prior art date
Application number
PCT/GB2004/000142
Other languages
French (fr)
Inventor
Stuart Lamb
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 WO2004066682A1 publication Critical patent/WO2004066682A1/en

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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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/748—Resistive heating elements, i.e. heating elements exposed to the air, e.g. coil wire heater
    • 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
    • H05B2203/016—Heaters using particular connecting means

Definitions

  • This invention relates to radiant electric heaters- for example for use in cooking appliances behind a sheet of material such as of glass-ceramic.
  • Radiant electric heaters are well known for use behind glass-ceramic cooking surfaces.
  • Such heaters can comprise a dish-like support, such as of metal, having therein a base layer of insulation material, such as microporous thermal and electrical insulation material.
  • At least one electric heating element is provided, supported on the surface of the base layer.
  • One form of heating element which has found wide acceptance is an elongate electrically conductive ribbon, supported on edge and secured in the surface of the base layer.
  • thermoresponsive device of rod-like form extending at least partly across the heater from an edge thereof and overlying the heating element or elements.
  • Such temperature-responsive device operates to control the operation of the heater, such as to prevent the glass-ceramic material of the cooking surface from reaching a high temperature at which damage would occur thereto.
  • a heater of this kind in which one or more terminal regions of the ribbon-form heating element or elements is or are arranged to exit the heater through a peripheral wall thereof for direct electrical connection, such as by welding, to electric terminal means provided externally of the heater.
  • Such terminal means may be conveniently provided on a housing means arranged externally of the heater at an end of the rod-like temperature-responsive device.
  • Such housing means suitably encloses one or more switch means associated with the temperature-responsive device .
  • a radiant electric heater comprising:
  • a base of thermal and electrical insulation material having a surface supporting at least one elongate electric heating element
  • the at least one heating element having at least one terminal region adapted to exit the heater, at at least one exit region thereof, through at least one aperture provided in the peripheral wall, for electrical connection to at least one electric terminal means;
  • the at least one terminal region being supported at a higher level than that of a remainder of the at least one heating element within the heater, the at least one heating element having at least one region, leading to or comprising the at least one terminal region, which is supported on at least one ascendant portion of the surface of the base.
  • the at least one ascendant portion of the surface of the base may be in the form of an elongate ramp, which may have suitably radiused transition regions at opposite ends thereof.
  • the at least one ascendant portion of the surface of the base may merge with at least one plateau region supporting at least part of the at least one terminal region of the at least one heating element at or adjacent to the at least one exit region of the heater.
  • the at least one plateau region may have an upper surface having a plane parallel or non-parallel to a plane of an upper surface of the peripheral wall of the heater, whereby the supported terminal region or regions of the at least one heating element exits or exit the heater in a direction substantially parallel to the plane of the upper surface of the peripheral wall or at a predetermined angle relative thereto.
  • the at least one plateau region may be disposed and dimensioned with respect to the at least one ascendant portion such that a substantially lateral change in direction of the at least one supported heating element is accommodated at or adjacent to the at least one terminal region thereof, to facilitate exit of the at least one terminal region at the at least one exit region of the heater.
  • a rod-like temperature-responsive device may be provided extending lengthwise at least partly across the heater from an edge thereof, through the peripheral wall and over the at least one electric heating element, the rodlike temperature-responsive device having a housing means at an end thereof externally of the heater and adjacent to the peripheral wall.
  • the housing means may have supported thereon the at least one electric terminal means for electrical connection thereto, such as by welding, of the at least one terminal region of the at least one heating element.
  • Two electric terminal means may be provided, laterally disposed at opposite sides of the housing means and adapted and arranged for electrical connection thereto of two terminal regions of the at least one heating element, exiting the heater at two exit regions thereof.
  • the housing means may accommodate at least one electric switch means.
  • An elongate recess with sloping sides may be provided extending beneath and along the rod-like temperature- responsive device, the at least one heating element being supported in and traversing the elongate recess .
  • the at least one ascendant portion of the surface of the base may be provided at least partly in the elongate recess.
  • the at least one elongate electric heating element may comprise at least one electrically conductive ribbon.
  • the at least one electrically conductive ribbon may be supported on edge on the surface of the base and may be of corrugated form.
  • the at least one electrically conductive ribbon may be provided with a plurality of spaced-apart legs, integral with the at least one electrically conductive ribbon or secured thereto, the legs extending edgewise from the at least one electrically conductive ribbon and being at least partially embedded in the surface of the base.
  • the base may comprise microporous thermal and electrical insulation material and may be provided in a dish-like support, such as of metal.
  • the radiant electric heater may be adapted for location beneath a cooking surface, such as of glass-ceramic material .
  • Figure 1 is a perspective view from above of part of an embodiment of a radiant electric heater according to the present invention
  • Figure 2 is a perspective view of part of an electrically conductive ribbon forming a heating element in the heater of Figure 1; and Figure 3 is a sideways perspective view of part of the heater of Figure 1, showing electrical connection of a terminal region of an elongate electric heating element in the form of an electrically conductive ribbon to an electric terminal means on a housing forming part of a temperature-responsive device.
  • the electrically conductive ribbon may be replaced by a different form of heating element, such as a spiral of bare resistance wire.
  • a radiant electric heater 2 such as for use underneath a cooking surface 4, for example of glass-ceramic material, comprises a metal dish-like support 6 having therein a base layer 8 of thermal and electrical insulation material, such as microporous thermal and electrical insulation material.
  • a radiant electric heating element is provided comprising an elongate corrugated electrically conductive ribbon 10, such as of iron- chromium-aluminium alloy. As shown in Figure 2, the corrugated ribbon 10 has spaced-apart legs 12 integral with or secured thereto and extending edgewise therefrom. The ribbon 10 is mounted edgewise on the base layer 8 and secured by at least partial embedding of the legs 12 in the surface of the base layer 8.
  • a peripheral wall 14 of insulation material is provided in the heater and has a top surface which may be arranged to contact a rear side of the cooking surface 4 in a cooking appliance.
  • a rod-like temperature-responsive device 16 is provided, comprising a metal outer tube and extending partly across the heater from an edge thereof.
  • the rod-like temperature-responsive device 16 is supported at the edge of the heater and has a free end 18 which is unsupported at an inner region of the heater.
  • the rod-like temperature-responsive device 16 suitably comprises differentially-expanding components which operate one or more switch means 20 provided in a housing 22 located externally of the heater at a periphery thereof.
  • An elongate recess 24, with sloping sides 26, 28, is provided in the surface of the base layer 8.
  • the elongate recess 24 is suitably of shell or scallop shape and extends radially from the edge of the heater and beneath and along the length of the rod-like temperature- responsive device 16.
  • the electrically conductive ribbon 10 is arranged to be supported in and to traverse the elongate recess 24, such that an upper edge 30 of the ribbon 10 substantially follows a contour of the surface of the elongate recess 24.
  • the upper edge 30 of the ribbon 10 at a region 32 underlying the temperature-responsive device 16 is arranged at a predetermined distance from the temperature-responsive device 16 and is provided at a lower level relative to the upper edges 30 of the ribbon 10 at regions 34, 36 at either side of the recess 24. Satisfactory electrical clearance is thereby ensured between the rod-like temperature-responsive device 16 and the underlying ribbon 10.
  • the electrically conductive ribbon 10 is suitably arranged with its legs 12 embedded in the base layer 8 to substantially the same extent in the elongate recess 24 as elsewhere in the base layer 8.
  • the electrically conductive ribbon 10 is provided with terminal regions 38, 40 which exit the heater, at exit regions 42, 44, through apertures 46, 48 provided in the peripheral wall 14 and a rim of the metal dish-like support 6.
  • the terminal regions 38, 40 of the ribbon 10 are electrically connected, by welding, to electric terminals 50, 52 laterally disposed and located at opposite sides of the housing 22 associated with the rodlike temperature-responsive device 16.
  • the terminal regions 38, 40 of the ribbon 10 are arranged to exit the heater at a level higher than that of the remainder of the ribbon 10 in the heater, while being adequately supported. It is also necessary to provide for the ribbon 10 to turn substantially laterally to enable the terminal regions 38, 40 to exit the heater at a selected angle, at the exit regions 42, 44 thereof.
  • the ramps 54, 56 have suitably-radiused transition regions 58, 60 and 62, 64 respectively, to provide smooth transition thereonto and therefrom of the ribbon 10.
  • the ramps 54, 56 also merge at their upper ends with plateau regions 66, 68 respectively of material of the base layer 8.
  • the plateau regions 66, 68 partly support, and have secured thereto, the terminal regions 38, 40 of the ribbon 10 and are disposed and dimensioned with respect to their associated ramps 54, 56 such that they accommodate the necessary substantially lateral turns of the ribbon 10 to enable the terminal regions 38, 40 of the ribbon 10 to exit the heater at the exit regions 42, 44 thereof.
  • the plateau regions 66, 68 are provided with surfaces having a plane which may be arranged substantially parallel to a plane of an upper surface 70 of the peripheral wall 14 and such that the terminal regions 38, 40 of the supported ribbon 10 exit the heater with their upper edges in a plane substantially parallel to the plane of the upper surface 70 of the peripheral wall 14.
  • the plateau regions 66, 68 may be provided with surfaces having a plane disposed at an angle to the plane of the upper surface 70 of the peripheral wall 14, such that the supported terminal regions 38, 40 of the ribbon 10 exit the heater with their upper edges in a plane at a predetermined desired angle to the plane of the upper surface 70 of the peripheral wall 14.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)

Abstract

A radiant electric heater (2) comprises a base (8) of thermal and electrical insulation material having a surface supporting at least one elongate electric heating element (10), and a peripheral wall (14) of thermal insulation material. The at least one heating element (10) has at least one terminal region (38, 40) adapted to exit the heater (2), at at least one exit region (42, 44) thereof, through at least one aperture (46, 48) provided in the peripheral wall (14), for electrical connection to at least one electric terminal means (50, 52). The at least one terminal region (38, 40) is supported at a higher level than a remainder of the at leA radiant electric heater (2) comprises a base (8) of thermal and electrical insulation material having a surface supporting at least one elongate electric heating element (10), and a peripheral wall (14) of thermal insulation material. The at least one heating element (10) has at least one terminal region (38, 40) adapted to exit the heater (2), at at least one exit region (42, 44) thereof, through at least one aperture (46, 48) provided in the peripheral wall (14), for electrical connection to at least one electric terminal means (50, 52). The at least one terminal region (38, 40) is supported at a higher level than a remainder of the at least one heating element (10) within the heater (2). The at least one heating element (10) has at least one region which is supported on at least one ascendant portion (54, 56) of the surface of the base (8).

Description

RADIANT ELECTRIC HEATER
This invention relates to radiant electric heaters- for example for use in cooking appliances behind a sheet of material such as of glass-ceramic.
Radiant electric heaters are well known for use behind glass-ceramic cooking surfaces. Such heaters can comprise a dish-like support, such as of metal, having therein a base layer of insulation material, such as microporous thermal and electrical insulation material. At least one electric heating element is provided, supported on the surface of the base layer. One form of heating element which has found wide acceptance is an elongate electrically conductive ribbon, supported on edge and secured in the surface of the base layer.
It is known to provide a temperature-responsive device of rod-like form extending at least partly across the heater from an edge thereof and overlying the heating element or elements. Such temperature-responsive device operates to control the operation of the heater, such as to prevent the glass-ceramic material of the cooking surface from reaching a high temperature at which damage would occur thereto.
It has been found advantageous to provide a heater of this kind in which one or more terminal regions of the ribbon-form heating element or elements is or are arranged to exit the heater through a peripheral wall thereof for direct electrical connection, such as by welding, to electric terminal means provided externally of the heater. Such terminal means may be conveniently provided on a housing means arranged externally of the heater at an end of the rod-like temperature-responsive device. Such housing means suitably encloses one or more switch means associated with the temperature-responsive device .
With this arrangement, there are restrictions arising from a need to maintain predetermined minimum electrical clearance distances between the terminal region or regions of the heating element or elements and adjacent metal components, for example the dish-like support of the heater and other components or assemblies such as forming part of the temperature-responsive device.
As a consequence, a problem has arisen in that it has been found to be necessary to provide for the terminal region or regions of the heating element or elements to exit the heater at a higher level than that of the remainder of the heating element or elements within the heater, whilst providing support therefor.
It is an object of the present invention to overcome or minimise this problem. According to the present invention there is provided a radiant electric heater comprising:
a base of thermal and electrical insulation material having a surface supporting at least one elongate electric heating element;
a peripheral wall of thermal insulation material;
the at least one heating element having at least one terminal region adapted to exit the heater, at at least one exit region thereof, through at least one aperture provided in the peripheral wall, for electrical connection to at least one electric terminal means;
the at least one terminal region being supported at a higher level than that of a remainder of the at least one heating element within the heater, the at least one heating element having at least one region, leading to or comprising the at least one terminal region, which is supported on at least one ascendant portion of the surface of the base.
The at least one ascendant portion of the surface of the base may be in the form of an elongate ramp, which may have suitably radiused transition regions at opposite ends thereof. The at least one ascendant portion of the surface of the base may merge with at least one plateau region supporting at least part of the at least one terminal region of the at least one heating element at or adjacent to the at least one exit region of the heater. The at least one plateau region may have an upper surface having a plane parallel or non-parallel to a plane of an upper surface of the peripheral wall of the heater, whereby the supported terminal region or regions of the at least one heating element exits or exit the heater in a direction substantially parallel to the plane of the upper surface of the peripheral wall or at a predetermined angle relative thereto.
The at least one plateau region may be disposed and dimensioned with respect to the at least one ascendant portion such that a substantially lateral change in direction of the at least one supported heating element is accommodated at or adjacent to the at least one terminal region thereof, to facilitate exit of the at least one terminal region at the at least one exit region of the heater.
A rod-like temperature-responsive device may be provided extending lengthwise at least partly across the heater from an edge thereof, through the peripheral wall and over the at least one electric heating element, the rodlike temperature-responsive device having a housing means at an end thereof externally of the heater and adjacent to the peripheral wall. The housing means may have supported thereon the at least one electric terminal means for electrical connection thereto, such as by welding, of the at least one terminal region of the at least one heating element.
Two electric terminal means may be provided, laterally disposed at opposite sides of the housing means and adapted and arranged for electrical connection thereto of two terminal regions of the at least one heating element, exiting the heater at two exit regions thereof.
The housing means may accommodate at least one electric switch means.
An elongate recess with sloping sides may be provided extending beneath and along the rod-like temperature- responsive device, the at least one heating element being supported in and traversing the elongate recess . The at least one ascendant portion of the surface of the base may be provided at least partly in the elongate recess.
The at least one elongate electric heating element may comprise at least one electrically conductive ribbon.
The at least one electrically conductive ribbon may be supported on edge on the surface of the base and may be of corrugated form. The at least one electrically conductive ribbon may be provided with a plurality of spaced-apart legs, integral with the at least one electrically conductive ribbon or secured thereto, the legs extending edgewise from the at least one electrically conductive ribbon and being at least partially embedded in the surface of the base.
The base may comprise microporous thermal and electrical insulation material and may be provided in a dish-like support, such as of metal.
The radiant electric heater may be adapted for location beneath a cooking surface, such as of glass-ceramic material .
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 perspective view from above of part of an embodiment of a radiant electric heater according to the present invention;
Figure 2 is a perspective view of part of an electrically conductive ribbon forming a heating element in the heater of Figure 1; and Figure 3 is a sideways perspective view of part of the heater of Figure 1, showing electrical connection of a terminal region of an elongate electric heating element in the form of an electrically conductive ribbon to an electric terminal means on a housing forming part of a temperature-responsive device. It should be noted the electrically conductive ribbon may be replaced by a different form of heating element, such as a spiral of bare resistance wire.
A radiant electric heater 2, such as for use underneath a cooking surface 4, for example of glass-ceramic material, comprises a metal dish-like support 6 having therein a base layer 8 of thermal and electrical insulation material, such as microporous thermal and electrical insulation material. A radiant electric heating element is provided comprising an elongate corrugated electrically conductive ribbon 10, such as of iron- chromium-aluminium alloy. As shown in Figure 2, the corrugated ribbon 10 has spaced-apart legs 12 integral with or secured thereto and extending edgewise therefrom. The ribbon 10 is mounted edgewise on the base layer 8 and secured by at least partial embedding of the legs 12 in the surface of the base layer 8.
A peripheral wall 14 of insulation material is provided in the heater and has a top surface which may be arranged to contact a rear side of the cooking surface 4 in a cooking appliance. A rod-like temperature-responsive device 16 is provided, comprising a metal outer tube and extending partly across the heater from an edge thereof. The rod-like temperature-responsive device 16 is supported at the edge of the heater and has a free end 18 which is unsupported at an inner region of the heater. The rod-like temperature-responsive device 16 suitably comprises differentially-expanding components which operate one or more switch means 20 provided in a housing 22 located externally of the heater at a periphery thereof.
An elongate recess 24, with sloping sides 26, 28, is provided in the surface of the base layer 8. The elongate recess 24 is suitably of shell or scallop shape and extends radially from the edge of the heater and beneath and along the length of the rod-like temperature- responsive device 16. The electrically conductive ribbon 10 is arranged to be supported in and to traverse the elongate recess 24, such that an upper edge 30 of the ribbon 10 substantially follows a contour of the surface of the elongate recess 24. The upper edge 30 of the ribbon 10 at a region 32 underlying the temperature- responsive device 16 is arranged at a predetermined distance from the temperature-responsive device 16 and is provided at a lower level relative to the upper edges 30 of the ribbon 10 at regions 34, 36 at either side of the recess 24. Satisfactory electrical clearance is thereby ensured between the rod-like temperature-responsive device 16 and the underlying ribbon 10. The electrically conductive ribbon 10 is suitably arranged with its legs 12 embedded in the base layer 8 to substantially the same extent in the elongate recess 24 as elsewhere in the base layer 8.
The electrically conductive ribbon 10 is provided with terminal regions 38, 40 which exit the heater, at exit regions 42, 44, through apertures 46, 48 provided in the peripheral wall 14 and a rim of the metal dish-like support 6. The terminal regions 38, 40 of the ribbon 10 are electrically connected, by welding, to electric terminals 50, 52 laterally disposed and located at opposite sides of the housing 22 associated with the rodlike temperature-responsive device 16.
To ensure suitable access by the terminal regions 38, 40 of the ribbon 10 to the terminals 50, 52 and also to ensure that predetermined minimum electrical clearance is provided between the terminal regions 38, 40 and adjacent metal components, such as the dish-like support 6 and other metal components, for example forming part of the temperature-responsive device 16, the terminal regions 38, 40 are arranged to exit the heater at a level higher than that of the remainder of the ribbon 10 in the heater, while being adequately supported. It is also necessary to provide for the ribbon 10 to turn substantially laterally to enable the terminal regions 38, 40 to exit the heater at a selected angle, at the exit regions 42, 44 thereof. This is achieved by providing the surface of the base layer 8 with ascendant portions in the form of elongate ramps 54, 56, the ribbon 10 being supported on and secured to the surface of the ramps 54, 56 in the same way as on and to the remainder of the surface of the base layer 8. The ramp 56 is provided at least partly in and traversing the elongate recess 24 in the base layer 8.
The ramps 54, 56 have suitably-radiused transition regions 58, 60 and 62, 64 respectively, to provide smooth transition thereonto and therefrom of the ribbon 10. The ramps 54, 56 also merge at their upper ends with plateau regions 66, 68 respectively of material of the base layer 8. The plateau regions 66, 68 partly support, and have secured thereto, the terminal regions 38, 40 of the ribbon 10 and are disposed and dimensioned with respect to their associated ramps 54, 56 such that they accommodate the necessary substantially lateral turns of the ribbon 10 to enable the terminal regions 38, 40 of the ribbon 10 to exit the heater at the exit regions 42, 44 thereof. The plateau regions 66, 68 are provided with surfaces having a plane which may be arranged substantially parallel to a plane of an upper surface 70 of the peripheral wall 14 and such that the terminal regions 38, 40 of the supported ribbon 10 exit the heater with their upper edges in a plane substantially parallel to the plane of the upper surface 70 of the peripheral wall 14. Alternatively, the plateau regions 66, 68 may be provided with surfaces having a plane disposed at an angle to the plane of the upper surface 70 of the peripheral wall 14, such that the supported terminal regions 38, 40 of the ribbon 10 exit the heater with their upper edges in a plane at a predetermined desired angle to the plane of the upper surface 70 of the peripheral wall 14.

Claims

1. A' radiant electric heater (2) characterised by:
a base (8) of thermal and electrical insulation material having a surface supporting at least one elongate electric heating element (10) ;
a peripheral wall (14) of thermal insulation material;
the at least one heating element (10) having at least one terminal region (38, 40) adapted to exit the heater (2), at at least one exit region (42, 44) thereof, through at least one aperture (46, 48) provided in the peripheral wall (14), for electrical connection to at least one electric terminal means (50, 52);
the at least one terminal region (38, 40) being supported at a higher level than that of a remainder of the at least one heating element (10) within the heater (2) , the at least one heating element (10) having at least one region which is supported on at least one ascendant portion (54, 56) of the surface of the base (8) .
2. A heater as claimed in claim 1, characterised in that the at least one region of the at least one heating element (10) supported on the at least one ascendant portion (54, 56) of the surface of the base (8) leads to the at least one terminal region (38, 40) .
3. A heater as claimed in claim 1, characterised in that the at least one region of the at least one heating element (10) supported on the at least one ascendant portion (54, 56) of the surface of the base (8) comprises the at least one terminal region (38, 40) .
4. A heater as claimed in any preceding claim, characterised in that the at least one ascendant portion (54, 56) of the surface of the base (8) is in the form of an elongate ramp.
5. A heater as claimed in claim 4, characterised in that the elongate ramp has radiused transition regions (58, 60, 62, 64) at opposite ends thereof.
6. A heater as claimed in any preceding claim, characterised in that the at least one ascendant portion (54, 56) of the surface of the base (8) merges with at least one plateau region (66, 68) supporting at least part of the at least one terminal region (38, 40) of the at least one heating element (10) at the at least one exit region (42, 44) of the heater (2) .
7. A heater as claimed in any one of claims 1 to 5, characterised in that the at least one ascendant portion (54, 56) of the surface of the base (8) merges with at least one plateau region (66, 68) supporting at least part of the at least one terminal region (38, 40) of the at least one heating element (10) adjacent to the at least one exit region (42, 44) of the heater (2) .
8. A heater as claimed in claim 6 or 7, characterised in that the at least one plateau region (66, 68) has an upper surface having a plane parallel to a plane of an upper surface (70) of the peripheral wall (14) of the heater (2) , whereby the supported at least one terminal region (38, 40) of the at least one heating element (10) exits the heater (2) in a direction substantially parallel to the plane of the upper surface (70) of the peripheral wall (14).
9. A heater as claimed in claim 6 or 7, characterised in that the at least one plateau region (66, 68) has an upper surface having a plane non-parallel to a plane of an upper surface (70) of the peripheral wall (14) of the heater (2), whereby the supported at least one terminal region (38, 40) of the at least one heating element (10) exits the heater (2) in a direction at a predetermined angle relative to the plane of the upper surface (70) of the peripheral wall (14) .
10. A heater as claimed in any one of claims 6 to 9, characterised in that the at least one plateau region
(66, 68) is disposed and dimensioned with respect to the at least one ascendant portion (54, 56) such that a substantially lateral change in direction of the at least one supported heating element (10) is accommodated at the at least one terminal region (38, 40) thereof, to facilitate exit of the at least one terminal region (38, 40) at the at least one exit region (42, 44) of the heater (2) .
11. A heater as claimed in any one of claims 6 to 9, characterised in that the at least one plateau region (66, 68) is disposed and dimensioned with respect to the at least one ascendant portion (54, 56) such that a substantially lateral change in direction of the at least one supported heating element (10) is accommodated adjacent to the at least one terminal region (38, 40) thereof, to facilitate exit of the at least one terminal region (38, 40) at the at least one exit region (42, 44) of the heater (2) .
12. A heater as claimed in any preceding claim, characterised in that a rod-like temperature-responsive device (16) is provided extending lengthwise at least partly across the heater (2) from an edge thereof, through the peripheral wall (14) and over the at least one electric heating element (10) , the rod-like temperature-responsive device (16) having a housing means (22) at an end thereof externally of the heater (2) and adjacent to the peripheral wall (14).
13. A heater as claimed in claim 12, characterised in that the housing means (22) has supported thereon the at least one electric terminal means (50, 52) for electrical connection thereto of the at least one terminal region (38, 40) of the at least one heating element (10) .
14. A heater as claimed in claim 13, characterised in that the electrical connection is by welding.
15. A heater as claimed in any one of claim 12, 13 or 14, characterised in that two electric terminal means (50, 52) are provided, laterally disposed at opposite sides of the housing means (22) and adapted and arranged for electrical connection thereto of two terminal regions (38, 40) of the at least one heating element (10), exiting the heater (2) at two exit regions (42, 44) thereof.
16. A heater as claimed in any one of claims 12 to 15, characterised in that the housing means (22) accommodates at least one electric switch means (20) .
17. A heater as claimed in any preceding claim, characterised in that an elongate recess (24) with sloping sides (26, 28) is provided extending beneath and along the rod-like temperature-responsive device (16), the at least one heating element (10) being supported in and traversing the elongate recess (24) .
18. A heater as claimed in claim 17, characterised in that the at least one ascendant portion (54, 56) of the surface of the base (8) is provided at least partly in the elongate recess (24) .
19. A heater as claimed in any preceding claim, characterised in that the at least one elongate electric heating element comprises at least one electrically conductive ribbon (10) .
20. A heater as claimed in claim 19, characterised in that the at least one electrically conductive ribbon (10) is supported on edge on the surface of the base (8) .
21. A heater as claimed in claim 19 or 20, characterised in that the at least one electrically conductive ribbon (10) is of corrugated form.
22. A heater as claimed in any one of claims 19 to 21, characterised in that the at least one electrically conductive ribbon (10) is provided with a plurality of spaced-apart legs (12) , the legs (12) extending edgewise from the at least one electrically conductive ribbon (10) and being at least partially embedded in the surface of the base (8 ) .
23. A heater as claimed in claim 22, characterised in that the legs (12) are integral with the at least one electrically conductive ribbon (10) .
24. A heater as claimed in claim 22, characterised in that the legs (12) are secured to the at least one electrically conductive ribbon (10) .
25. A heater as claimed in any preceding claim, characterised in that the base (8) comprises microporous thermal and electrical insulation material.
26. A heater as claimed in any preceding claim, characterised in that the base (8) is provided in a dishlike support ( 6) .
27. A heater as claimed in claim 26, characterised in that the dish-like support (6) is of metal.
28. A heater as claimed in any preceding claim, characterised by being adapted for location beneath a cooking surface (4) .
29. A heater as claimed in claim 28, characterised in that the cooking surface (4) is of glass-ceramic material .
PCT/GB2004/000142 2003-01-18 2004-01-16 Radiant electric heater WO2004066682A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0301168A GB0301168D0 (en) 2003-01-18 2003-01-18 Radiant electric heater
GB0301168.1 2003-01-18

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WO2004066682A1 true WO2004066682A1 (en) 2004-08-05

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1750484A1 (en) * 2005-08-01 2007-02-07 Electrovac AG Heating band for an electrical heater, heater with such a heating band and process of manufacturing of the heating band

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5498853A (en) * 1992-09-03 1996-03-12 E.G.O. Elektro-Gerate Blanc U. Fischer Heater, particularly for kitchen appliances
US5796075A (en) * 1992-03-09 1998-08-18 E.G.O. Elektro-Gerate Blanc Und Fisher Gmbh & Co. Kg Heater, particularly for kitchen appliances
GB2357299A (en) * 1999-12-14 2001-06-20 Ceramaspeed Ltd Insulation component
EP1215940A2 (en) * 2000-12-16 2002-06-19 Ceramaspeed Limited Radiant electric heater

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5796075A (en) * 1992-03-09 1998-08-18 E.G.O. Elektro-Gerate Blanc Und Fisher Gmbh & Co. Kg Heater, particularly for kitchen appliances
US5498853A (en) * 1992-09-03 1996-03-12 E.G.O. Elektro-Gerate Blanc U. Fischer Heater, particularly for kitchen appliances
GB2357299A (en) * 1999-12-14 2001-06-20 Ceramaspeed Ltd Insulation component
EP1215940A2 (en) * 2000-12-16 2002-06-19 Ceramaspeed Limited Radiant electric heater

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1750484A1 (en) * 2005-08-01 2007-02-07 Electrovac AG Heating band for an electrical heater, heater with such a heating band and process of manufacturing of the heating band
US7446286B2 (en) 2005-08-01 2008-11-04 Electrovac Ag Heater strip for an electric heater, heater with such a heater strip and method for manufacturing the heater strip

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