EP0694149B1 - Mulde und Verfahren - Google Patents

Mulde und Verfahren Download PDF

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Publication number
EP0694149B1
EP0694149B1 EP94912025A EP94912025A EP0694149B1 EP 0694149 B1 EP0694149 B1 EP 0694149B1 EP 94912025 A EP94912025 A EP 94912025A EP 94912025 A EP94912025 A EP 94912025A EP 0694149 B1 EP0694149 B1 EP 0694149B1
Authority
EP
European Patent Office
Prior art keywords
insert
hob
glass
ceramic
temperature sensitive
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.)
Expired - Lifetime
Application number
EP94912025A
Other languages
English (en)
French (fr)
Other versions
EP0694149A1 (de
Inventor
Craig Anthony Hill
Maurice Hugh Carter
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.)
Redring Electric Ltd
Original Assignee
Redring Electric 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 Redring Electric Ltd filed Critical Redring Electric Ltd
Publication of EP0694149A1 publication Critical patent/EP0694149A1/de
Application granted granted Critical
Publication of EP0694149B1 publication Critical patent/EP0694149B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H05B3/746—Protection, e.g. overheat cutoff, hot plate indicator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/10—Tops, e.g. hot plates; Rings
    • F24C15/102—Tops, e.g. hot plates; Rings electrically heated

Definitions

  • the present invention relates to hobs of the type which employ radiant heating elements.
  • GB 1349024 there is disclosed another hotplate design comprising a glass-ceramic insert, and this document discloses how heat can be uniformly dispersed through the glass-ceramic material by means of a high conductivity heat spreader plate.
  • a hob comprising: a substantially planar member having at least one aperture herein defining a hotplate region; a substantially planar glass-ceramic insert located in the aperture and a radiant heating element below the glass-ceramic insert, wherein the glass-ceramic insert is moulded such as to have one or more integrally moulded features on the lower surface thereof.
  • the present invention retains the advantages provided by a conventional ceramic hob, either incorporating a tungsten halogen or inductive heating source, of fast response time and easy cleaning.
  • a hob in accordance with the present invention significant other advantages are obtained.
  • a number of features can be incorporated into the hob which would not be possible using glass-ceramic material formed in sheets by the float glass or other process.
  • less glass-ceramic material is used which material is expensive relative to materials used for the member, such as enamelled steel or a suitable worksurface material.
  • the phrase "moulded glass-ceramic insert” includes inserts made by moulding glass which is then heat treated to change the structure of the glass to that of a glass-ceramic.
  • One such material would be lithium-alumino-silicate.
  • the lower surface of the insert can advantageously be moulded such as to form a lens for modifying the radiation pattern through the insert, to provide a desired heat distribution over the surface of the hotplate region.
  • this lens is a Fresnel lens enabllng the lowermost surface of the insert to remain substantially planar, thereby avoiding increasing the depth of the insert.
  • the insert is moulded to support a temperature sensitive element, substantially the whole of the temperature sensitive region of the element preferably being held in thermal contact with the insert. This enables the heating element to then be controlled in dependence on the temperature of the glass-ceramic insert instead of on the resistance of the heating element or over temperature cut-out conventionally mounted below the hotplate of a ceramic hob.
  • the insert preferably comprises a temperature sensitive element which in use is connected to a control circuit that regulates the radiant heating element in dependence on the output of the temperature sensitive element.
  • the temperature sensitive element is preferably formed by a region of the glass-ceramic material of the insert, electrodes electrically connected to the control means being formed on the insert defining a region of the insert which is the temperature sensitive element.
  • the glass-ceramic material is a poor electrical conductor, the resistance of which is temperature dependent.
  • the electrodes would normally be closely spaced because of the poor resistive nature of the glass-ceramic, but this ensures the resistive value is not significantly altered by a conductive metal cooking utensil being placed on the upper surface of the insert.
  • the region of the insert forming the temperature sensitive region can have material diffused therein in order to modify the conductive properties of that region.
  • the temperature sensitive element comprises a temperature sensitive conductive strip deposited on the insert.
  • the electrodes, or conductive strip of the above embodiments are preferably deposited by screen printing, pad printing or by a spray deposition method.
  • the advantage of having a temperature sensitive element directly on the glass ceramic material or formed in that material is that it eliminates the need for both control means for the normal operation of the heating element, often achieved by monitoring the current in the heating elements, and an over temperature protection device located conventionally just below the glass-ceramic layer of a conventional ceramic hob. It is therefore preferable that the control means is electrically connected to the temperature sensitive element and arranged such as to control both the normal heating function of the radiant heating element and also ensure the maximum safe operating temperature of the glass-ceramic insert is not exceeded.
  • seal between the insert and the member which seal is formed from a mixture of alumina/glass fibre and a silicone sealant.
  • a mixture prevents the ingress of water or dirt below the insert, and also provides a high resistance to abrasion when the surface is cleaned.
  • the hob further comprises a canister mounted below said insert for supporting said heating element, wherein the insert has a downward protruding annular ridge by means of which the canister is located, thereby ensuring that the canister is correctly centred relative to the insert.
  • the member supports resilient mounting means which urge a canister in which the heating element is supported towards the insert, the canister comprising thermally insulating material which is arranged such that this is urged into contact with the insert.
  • the mass of the thermal insulating material and canister provides damping to any shock force experienced by the glass, but by being mounted to the member itself does not provide an excessive upward force on the insert relative to the insert in response to the member being depressed.
  • the member comprises a downwardly protruding annular shelf about the aperture, the shelf supporting the insert and the resilient mounting means such that the attachment of the resilient mounting means to the shelf is obscured from view by the insert.
  • the glass-ceramic is thermo-chromic as this provides a visual indication that the glass-ceramic is hot even though the hob may be turned off.
  • the present invention provides a method of manufacturing a hob comprising arranging a radiant heating element below an aperture in a substantially planar member and inserting a ceramic-glass element in said aperture, the method being characterised in including the step of forming the ceramic-glass insert by a moulding process.
  • the hob comprises a member 1 of vitreous enamelled steel having an aperture 2 therein.
  • the steel around the edge of the aperture 2 is bent to form a shelf 3 on which is positioned a moulded glass-ceramic insert 4 supported by means of an alumina/glass fibre and silicone mixture.
  • the glass-ceramic insert comprises a lithium-alumino-silicate which has a working range in which it can be moulded of 1200-1800°C.
  • Insert 4 has a Fresnel lens 6 moulded onto its lower surface, seen in Figure 2, which controls the dispersion of light from tungsten halogen lamp 7, and on its upper surface spillage retention channel 10. Energisation of the lamp 7 is controlled in dependence on the electrical resistance of the lower surface of insert 4 which is determined by control circuitry (not shown) by measuring the resistive value of the glass between conductors 8a and 8b. These are platinum based electrodes formed by pad printing and processing an appropriate proprietary material, one suitable material being Cermet® Platinum Conductor marketed by E.S.L. (Europe). The conductors 8a and 8b are electrically connected at the edge of the insert 4 to control circuitry (not shown) by means of terminal 9.
  • each resilient mounting means 11 comprising a pin and captive spring, which urge upwards metal canister 12, which houses tungsten halogen lamp 7 and additional wire wound heating elements 13.
  • the canister 12 is lined with thermally insulating material 14, a wall portion 15 of which is urged by means of the canister 12 and resilient mounting means 11 into contact with the glass-ceramic insert 4. Further pressure on the glass-ceramic insert 4 by the wall 15 is prevented by the wall 15 coming into contact with the lip 3.
  • FIG 3 shows an alternative arrangement of the hob of Figure 1.
  • the ceramic-glass insert 4 has three downwardly extending legs 16, only one of which is shown. These to-operate with a retention member 17 by which the insert is retained in the canister 12 prior to mounting from underneath the member 1.
  • Figure 4 illustrates an arrangement when the ceramic insert can be inserted into the member 1 from the top, with the canister 12 already in position.
  • a downwardly protruding skirt 18, moulded in the insert 4 retaining the insulating ring 15 such that when inserted the ring 15, in conjunction with the layer of insulating material 14, provides thermally insulated housing for the heating element 7.
  • FIG. 5 illustrates a complete hob which Figures 1 and 2 or Figure 3 or Figure 4, depict a part thereof.
  • This hob comprises five hotplates, but it will be realized that any number and shape of hotplates could be employed in a hob in accordance with the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Resistance Heating (AREA)
  • Electric Stoves And Ranges (AREA)
  • Confectionery (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Table Equipment (AREA)

Claims (19)

  1. Kochfeld, das ein im wesentlichen ebenes Element (1), in dem mindestens eine Öffnung (2) vorgesehen ist, die einen Heizplattenbereich festlegt, einen im wesentlichen ebenen Glaskeramikeinsatz (4), der in der Öffnung (2) angeordnet ist, und ein Strahlungsheizelement (7) unter dem Glaskeramikeinsatz umfaßt, dadurch gekennzeichnet, daß der Glaskeramikeinsatz derart geformt ist, daß er ein oder mehrere integral geformte Merkmale (6, 16, 18) an einer seiner Oberflächen aufweist.
  2. Kochfeld nach Anspruch 1, wobei die untere Oberfläche des Einsatzes derart geformt ist, daß sie eine Linse (6) bildet, um das Strahlungsprofil durch den Einsatz (4) zu modifizieren.
  3. Kochfeld nach Anspruch 2, wobei die Linse (6) eine Fresnel-Linse ist.
  4. Kochfeld nach einem der vorhergehenden Ansprüche, wobei der Einsatz derart geformt ist, daß er ein temperaturempfindliches Element tragen kann.
  5. Kochfeld nach Anspruch 4, wobei im wesentlichen der gesamte temperaturempfindliche Bereich des temperaturempfindlichen Elements in thermischem Kontakt mit dem Einsatz gehalten wird.
  6. Kochfeld nach Anspruch 1, 2 oder 3, wobei der Einsatz ein temperaturempfindliches Element umfaßt, das im Gebrauch mit einem Steuerkreis verbunden ist, der das Strahlungsheizelement in Abhängigkeit von dem Ausgang des temperaturempfindlichen Elements regelt.
  7. Kochfeld nach Anspruch 6, wobei das temperaturempfindliche Element ein temperaturempfindliches Widerstandselement ist, das von einem Bereich des Glaskeramikmaterials des Einsatzes gebildet ist.
  8. Kochfeld nach Anspruch 7, wobei Elektroden (8a, 8b), die elektrisch mit dem Steuermittel verbunden sind, an dem Einsatz gebildet sind und einen Bereich des Einsatzes festlegen, der das temperaturempfindliche Element ist.
  9. Kochfeld nach Anspruch 8, wobei die Leitungseigenschaften des Bereiches des Einsatzes durch Diffusion von Material in diesen Bereich hinein modifiziert sind.
  10. Kochfeld nach Anspruch 6, wobei das temperaturempfindliche Element einen temperaturempfindlichen, leitfähigen Streifen umfaßt, der auf den Einsatz abgelagert ist.
  11. Kochfeld nach Anspruch 10, wobei der leitfähige Streifen durch Siebdrucken, Tampondrucken oder durch ein Sprühablagerungsverfahren abgelagert ist.
  12. Kochfeld nach einem der Ansprüche 4 bis 11, wobei ein Steuermittel mit dem Ausgang des temperaturempfindlichen Elements elektrisch verbunden und derart angeordnet ist, daß es in Abhängigkeit von dem Ausgang des temperaturempfindlichen Elements die normale Heizfunktion des Strahlungsheizelements steuert und auch sicherstellt, daß die maximale sichere Arbeitstemperatur des Glaskeramikeinsatzes nicht überschritten wird.
  13. Kochfeld nach einem der vorhergehenden Ansprüche, das ferner einen Behälter (12) umfaßt, der unter dem Einsatz (4) befestigt ist, um das Heizelement (7) zu tragen, wobei der Einsatz eine nach unten vorstehende ringförmige Lippe (18) aufweist, durch die der Behälter festgelegt ist.
  14. Kochfeld nach einem der vorhergehenden Ansprüche, wobei das Element federnde Montagemittel trägt, die einen Behälter, in dem das Heizelement getragen ist, auf den Einsatz zu drängen, wobei der Behälter thermisch isolierendes Material umfäßt, das derart angeordnet ist, daß es in Kontakt mit dem Einsatz gedrängt wird.
  15. Kochfeld nach Anspruch 14, wobei das Element (1) um die Öffnung (2) herum ein nach unten vorstehendes, ringförmiges Gestell (3) umfaßt, wobei das Gestell den Einsatz und die federnden Montagemittel trägt.
  16. Kochfeld nach einem der vorhergehenden Ansprüche, wobei das Element (1) und der Einsatz (4) derart angeordnet sind, daß ihre oberen Oberflächen im wesentlichen bündig sind.
  17. Kochfeld nach einem der vorhergehenden Ansprüche, das ferner eine Dichtung (5) zwischen dem Einsatz (4) und dem Element (1) umfäßt, welche Dichtung aus einer Mischung aus Aluminiumoxid/Glasfaser und einem Silikondichtmittel gebildet ist.
  18. Kochfeld nach einem der vorhergehenden Ansprüche, wobei die Glaskeramik des Einsatzes thermochrom ist.
  19. Verfahren zur Herstellung eines Kochleldes, das umfaßt, daß ein Strahlungsheizelement unter einer Öffnung (2) in einem im wesentlichen ebenen Element (1) angeordnet wird, und daß ein Keramikglaselement (4) in die Öffnung (2) eingesetzt wird, wobei das Verfahren dadurch gekennzeichnet ist, daß es den Schritt umfaßt, daß der Keramikglaseinsatz (4) durch einen Formungsprozeß gebildet wird.
EP94912025A 1993-04-13 1994-04-07 Mulde und Verfahren Expired - Lifetime EP0694149B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9307608A GB2277145B (en) 1993-04-13 1993-04-13 A hob
GB9307608 1993-04-13
PCT/GB1994/000739 WO1994024490A1 (en) 1993-04-13 1994-04-07 A hob

Publications (2)

Publication Number Publication Date
EP0694149A1 EP0694149A1 (de) 1996-01-31
EP0694149B1 true EP0694149B1 (de) 1998-06-03

Family

ID=10733734

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94912025A Expired - Lifetime EP0694149B1 (de) 1993-04-13 1994-04-07 Mulde und Verfahren

Country Status (8)

Country Link
EP (1) EP0694149B1 (de)
JP (1) JPH08509057A (de)
AT (1) ATE166955T1 (de)
AU (1) AU6434294A (de)
DE (1) DE69410791T2 (de)
ES (1) ES2117787T3 (de)
GB (1) GB2277145B (de)
WO (1) WO1994024490A1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5994674A (en) * 1993-04-13 1999-11-30 Gda Applied Energy Limited Hob
US5746114A (en) * 1995-08-15 1998-05-05 Harris; David P. Intelligent cooking system with wireless control
GB2323922B (en) * 1997-04-02 2001-08-29 Redring Electric Ltd A heating unit for a hob
DE102004023847B4 (de) * 2004-05-13 2013-12-05 BSH Bosch und Siemens Hausgeräte GmbH Kochfläche mit einer Glaskeramikplatte
KR100771628B1 (ko) 2006-05-11 2007-10-31 엘지전자 주식회사 전기레인지
KR102705245B1 (ko) * 2017-02-13 2024-09-11 엘지이노텍 주식회사 카메라 모듈 및 자동차

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1349024A (en) * 1970-07-24 1974-03-27 Gen Electric Surface heating units

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3781523A (en) * 1972-03-27 1973-12-25 Gen Electric Thermochromic surface heating apparatus
US3885128A (en) * 1974-07-01 1975-05-20 Gen Electric Glass-ceramic plate heating unit cast-in heat spreader
GB2138935B (en) * 1983-04-22 1987-11-18 Redring Electric Ltd Electric hobs
DE3440868A1 (de) * 1983-12-19 1985-06-27 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Kochmulde
GB8517401D0 (en) * 1985-07-10 1985-08-14 Redring Electric Ltd Electric hobs
DE3768773D1 (de) * 1986-11-14 1991-04-25 Fink Karl Eisfink Vorrichtung zum warmhalten, insbesondere von speisen.
GB8709051D0 (en) * 1987-04-15 1987-05-20 Emi Plc Thorn Thermochromic temperature sensor
DE3918621A1 (de) * 1989-06-07 1990-12-13 Bosch Siemens Hausgeraete Kochmulde fuer elektroherde, kochplatten oder dgl.
DE4022846C2 (de) * 1990-07-18 1994-08-11 Schott Glaswerke Vorrichtung zur Leistungssteuerung und -begrenzung bei einer Heizfläche aus Glaskeramik oder einem vergleichbaren Material

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1349024A (en) * 1970-07-24 1974-03-27 Gen Electric Surface heating units

Also Published As

Publication number Publication date
DE69410791D1 (de) 1998-07-09
GB2277145A (en) 1994-10-19
GB9307608D0 (en) 1993-06-02
GB2277145B (en) 1997-08-27
JPH08509057A (ja) 1996-09-24
DE69410791T2 (de) 1998-10-01
ATE166955T1 (de) 1998-06-15
AU6434294A (en) 1994-11-08
ES2117787T3 (es) 1998-08-16
EP0694149A1 (de) 1996-01-31
WO1994024490A1 (en) 1994-10-27

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