EP0981264A2 - Chauffage électrique - Google Patents

Chauffage électrique Download PDF

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Publication number
EP0981264A2
EP0981264A2 EP99306134A EP99306134A EP0981264A2 EP 0981264 A2 EP0981264 A2 EP 0981264A2 EP 99306134 A EP99306134 A EP 99306134A EP 99306134 A EP99306134 A EP 99306134A EP 0981264 A2 EP0981264 A2 EP 0981264A2
Authority
EP
European Patent Office
Prior art keywords
ring
dish
heater according
insulation member
shaped
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.)
Withdrawn
Application number
EP99306134A
Other languages
German (de)
English (en)
Other versions
EP0981264A3 (fr
Inventor
David Aubrey Plumptre
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.)
Ceramaspeed Ltd
Original Assignee
Ceramaspeed Ltd
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 Ltd filed Critical Ceramaspeed Ltd
Publication of EP0981264A2 publication Critical patent/EP0981264A2/fr
Publication of EP0981264A3 publication Critical patent/EP0981264A3/fr
Withdrawn legal-status Critical Current

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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

Definitions

  • This invention relates to electric heaters particularly, but not exclusively, for use in cooking appliances behind a sheet of a material such as glass-ceramic which may be a cooking surface.
  • Electric heaters are well known for use behind glass-ceramic cooking surfaces.
  • Such heaters can comprise a metal support dish formed with a base and an upstanding peripheral rim and having therein a base layer of insulation material, such as microporous thermal and electrical insulation material.
  • At least one electrical heating element is provided, supported on or adjacent to the surface of the base layer.
  • a ring-shaped insulation member is known to be arranged within the dish adjacent to the peripheral rim and supported at least in part on the layer of insulation material.
  • Such ring-shaped insulation member may have a top surface arranged to contact the rear surface of a glass-ceramic cooking plate.
  • such a ring-shaped insulation member prefferably comprises a material such as bound vermiculite, although other materials are also well known to be used.
  • the ring-shaped insulation member may be secured in the dish by frictional engagement with the rim, or with a stepped and/or tapered shim of insulation material of the base layer provided between the ring-shaped member and the rim.
  • frictional engagement can be inadequate, particularly since some softening or shrinkage of the ring-shaped member may occur at elevated temperatures when the heater is subsequently operated. As a result, undesirable detachment of the ring-shaped member from the dish may occur.
  • US-A-5 223 697 describes an electric radiant heater in which a snap connection is provided between the peripheral rim of the support dish and the ring-shaped insulation member. A downwardly sloping and inwardly projecting resilient tab is pressed back after the ring-shaped insulation member has been inserted to engage in a vertical slot formed in the peripheral surface of the ring-shaped member.
  • a disadvantage of this arrangement is that, because the free edge of the snap connection is located in the lower region of the peripheral rim, it is not suited to use with a stepped and/or tapered shim of insulation material as described above and this reduces the range of use of the arrangement. A further disadvantage is that the snap connection can be unreliable.
  • an electric heater comprising a metal support dish having a base and an upstanding peripheral rim having a free upper edge, a layer of insulation material in the dish with at least one heating element disposed relative thereto, a ring-shaped insulation member arranged within the dish adjacent to the peripheral rim and supported at least in part on the layer of insulation material, and securing means being provided for the ring-shaped insulation member, wherein the securing means comprises at least one narrow strip of dish material at the free upper edge of the rim, and wherein the or each narrow strip is formed by a slit section of the dish extending substantially parallel to the free upper edge, the or each narrow strip being deformed over substantially the entire width thereof to overlyingly engage a portion of the ring-shaped insulation member.
  • the portion of the ring-shaped insulation member overlyingly engaged by the or each deformed narrow strip may comprise a protrusion on the member or may comprise a slot, rebate, groove or ledge on or in a section of the member.
  • the or each narrow strip may be deformed over substantially the entire width thereof into a loop shape within the dish, which loop shape overlyingly engages a portion of the ring-shaped insulation member.
  • the loop shape may be continuous or discontinuous, that is, broken.
  • the or each narrow strip may be cut to form a tine which is shaped to overlyingly engage a portion of the ring-shaped insulation member.
  • a plurality of spaced apart narrow strips of dish material may be provided, formed by a plurality of slit sections of the dish, the narrow strips being deformed over substantially the entire width thereof to overlyingly engage associated portions of the ring-shaped insulation member.
  • the associated portions of the ring-shaped insulation member may comprise a plurality of outwardly directed protrusions provided on and spaced apart around the member, the protrusions having top surfaces overlyingly engaged by the deformed narrow strips.
  • the protrusions may be integral with the member.
  • the protrusions may be of higher density than the remainder of the member.
  • the ring-shaped insulation member may comprise bound vermiculite.
  • the layer of insulation material may comprise microporous thermal and electrical insulation material.
  • a shim of the insulation material of the layer may be provided between at least a portion of the ring-shaped insulation member and the upstanding peripheral rim of the dish.
  • the shim may be of stepped or tapered form, reducing in width towards the top of the peripheral rim of the dish.
  • the ring-shaped insulation member may be of suitably complementary stepped or tapered form for contact with the shim of insulation material.
  • An electric heater according to the present invention comprises a metal support dish 1 having a base 1A and an upstanding peripheral rim 1B having a free upper edge.
  • a layer 2 of microporous insulation material is provided in the dish 1 with at least one heating element 3, such as of corrugated ribbon or coiled wire form, disposed thereon or adjacent thereto.
  • the dish is slit generally in the circumferential direction of the rim at regions 4 between the edge of the rim and the base 1A to provide narrow strips 5 of dish material spaced apart around the rim at the edge thereof.
  • the slits 4 and the narrow strips 5 extend substantially parallel to the free edge of the peripheral rim 1B.
  • a ring-shaped insulation member 6, comprising bound vermiculite, is arranged to be located within the dish 1 adjacent to the peripheral rim lB and supported at least in part on the layer 2 of insulation material.
  • a shim 7 of insulation material of the layer 2, of lower thermal conductivity than the ring-shaped insulation member 6, is optionally provided between the ring-shaped member 6 and the peripheral rim 1B of the dish.
  • This shim 7 may be of stepped or tapered form, reducing in width towards the top of the peripheral rim 1B of the dish.
  • the ring-shaped insulation member 6 is of suitably complementary stepped or tapered form for contact with the shim 7 of insulation material.
  • a plurality of outwardly-directed protrusions 8 are provided integral with the ring-shaped member 6 and spaced apart around the peripheral surface of the member. Such protrusions have top surfaces 9 intermediate the top and bottom of the peripheral surface of the member and are preferably formed of a higher density than the ring-shaped member 6 itself. This is achieved by compacting the vermiculite material of the protrusions 8 to a greater extent than the material of the remainder of the ring-shaped member 6 during formation of the ring-shaped member 6.
  • the ring-shaped member 6 is located in the heater with the protrusions 8 on the member 6 aligned with the narrow strips 5 of dish material.
  • the narrow strips 5 are deformed over substantially the entire width thereof (that is in a direction substantially perpendicular to the free edge) into loop shapes within the dish, which loop shapes overlie and engage the top surfaces 9 of the protrusions 8 and secure the ring-shaped member 6 in position in the heater. Partial deformation of the narrow strips may be effected prior to locating the ring-shaped member in the heater.
  • the loop shapes of the narrow strips 5 can be continuous, as shown in Figure 2. They could however be discontinuous (i.e. broken), as shown by reference numeral 5A in Figure 3, by breaking or cutting the narrow strips prior to or during deformation thereof.
  • slots, rebates, grooves or ledges 10 could be provided in the member 6, facing the upstanding peripheral rim 1B of the dish, the deformed narrow strips 5, 5A, 5B, either as loop shapes or tines, engaging with such slots, rebates, grooves or ledges 10 to secure the ring-shaped member 6 in position in the heater.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)
  • Table Devices Or Equipment (AREA)
EP99306134A 1998-08-14 1999-08-02 Chauffage électrique Withdrawn EP0981264A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9817644 1998-08-14
GB9817644A GB2340714A (en) 1998-08-14 1998-08-14 Securing insulation in support dish

Publications (2)

Publication Number Publication Date
EP0981264A2 true EP0981264A2 (fr) 2000-02-23
EP0981264A3 EP0981264A3 (fr) 2000-10-04

Family

ID=10837199

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99306134A Withdrawn EP0981264A3 (fr) 1998-08-14 1999-08-02 Chauffage électrique

Country Status (2)

Country Link
EP (1) EP0981264A3 (fr)
GB (1) GB2340714A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005035463A1 (de) * 2005-07-28 2007-02-01 BSH Bosch und Siemens Hausgeräte GmbH Heizeinrichtung für Glaskeramik-Kochplatten
RU184993U1 (ru) * 2017-02-20 2018-11-16 Алексей Юрьевич Калиткин Кварцевый монолитный электрический нагреватель

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8702714U1 (de) * 1987-02-21 1987-04-16 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Strahlheizkörper für Kochgeräte
US5223697A (en) * 1990-12-11 1993-06-29 E.G.O. Elektro-Gerate Blanc U. Fischer Electric radiant heater
DE29702590U1 (de) * 1997-02-14 1997-04-03 E.G.O. Elektro-Gerätebau Gmbh, 75038 Oberderdingen Wärmeisolierender Abstandshalter für Strahlungsheizkörper

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1569747A (en) * 1978-05-20 1980-06-18 Backer Electric Co Ltd Heaters
GB2318489B (en) * 1996-10-18 2000-09-06 Ceramaspeed Ltd Radiant electric heater and method of manufacture

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8702714U1 (de) * 1987-02-21 1987-04-16 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Strahlheizkörper für Kochgeräte
US5223697A (en) * 1990-12-11 1993-06-29 E.G.O. Elektro-Gerate Blanc U. Fischer Electric radiant heater
DE29702590U1 (de) * 1997-02-14 1997-04-03 E.G.O. Elektro-Gerätebau Gmbh, 75038 Oberderdingen Wärmeisolierender Abstandshalter für Strahlungsheizkörper

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005035463A1 (de) * 2005-07-28 2007-02-01 BSH Bosch und Siemens Hausgeräte GmbH Heizeinrichtung für Glaskeramik-Kochplatten
RU184993U1 (ru) * 2017-02-20 2018-11-16 Алексей Юрьевич Калиткин Кварцевый монолитный электрический нагреватель

Also Published As

Publication number Publication date
GB9817644D0 (en) 1998-10-07
EP0981264A3 (fr) 2000-10-04
GB2340714A (en) 2000-02-23

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