EP0162620A2 - Kocheinrichtung - Google Patents

Kocheinrichtung Download PDF

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Publication number
EP0162620A2
EP0162620A2 EP85303108A EP85303108A EP0162620A2 EP 0162620 A2 EP0162620 A2 EP 0162620A2 EP 85303108 A EP85303108 A EP 85303108A EP 85303108 A EP85303108 A EP 85303108A EP 0162620 A2 EP0162620 A2 EP 0162620A2
Authority
EP
European Patent Office
Prior art keywords
arrangement
infra
layer
lamps
heating unit
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Withdrawn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
EP85303108A
Other languages
English (en)
French (fr)
Other versions
EP0162620A3 (de
Inventor
Bernard Frederick Fellerman
Graham Howlett Goodchild
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.)
QED Intellectual Property Ltd
Original Assignee
Thorn EMI Appliances Ltd
Thorn EMI Patents 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
Priority claimed from GB848412072A external-priority patent/GB8412072D0/en
Priority claimed from GB848412073A external-priority patent/GB8412073D0/en
Application filed by Thorn EMI Appliances Ltd, Thorn EMI Patents Ltd filed Critical Thorn EMI Appliances Ltd
Publication of EP0162620A2 publication Critical patent/EP0162620A2/de
Publication of EP0162620A3 publication Critical patent/EP0162620A3/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • F24C15/106—Tops, e.g. hot plates; Rings electrically heated electric circuits
    • 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
    • H05B3/744—Lamps as heat source, i.e. heating elements with protective gas envelope, e.g. halogen lamps

Definitions

  • This invention relates to a cooking arrangement comprising a pan-supportive layer of infra-red-transmissive material, one or more discrete regions of which are heatable by a heating unit including at least one infra-red lamp disposed in between a thermally-insulative layer and the underside of the pan-supportive layer.
  • a cooking hob is formed, in one example, by supporting four heating units, each consisting of a generally circular shallow tray having a layer of thermally-insulative material disposed therewithin and supporting four tubular infra-red lamps, beneath a layer of infra-red-transmissive material, such as glass ceramic.
  • Each heating unit thus provides a hotplate region on the infra-red-transmissive layer, upon which a cooking implement containing food to be cooked may be placed.
  • the heating unit is supported adjacent the underside of the pan-supportive layer by a pedestal, the pedestal forming at least part of a base structure of the cooking arrangement.
  • the arrangement may also include resilient means for biassing the beating unit towards the underside of the pan-supportive layer.
  • Apertures may be provided in the base structure and/or a casing for the cooking arrangement to permit air convection through the arrangement, and additionally or alternatively the casing may be connected to the base of the pedestal.
  • a control arrangement may be utilised to switch respective filaments of the lamps into series and/or parallel configurations to select discrete power outputs of the heating unit.
  • the present cooking arrangement thus includes a less complex support for the beating unit than that used in conventional hobs, thereby enabling the cooking arrangement to be more compact and portable than cooking bobs known hitherto, whilst at the same time providing the required degree of ruggedness for the supported components.
  • the arrangement may include only a single beating unit and a corresponding hotplate region, or possibly two units and two hotplate regions, thereby adding to the compactness of the cooking arrangement.
  • Figure 1 shows a cooking arrangement including an infra-red heating unit 1 consisting of a thermally-insulative cylindrical housing 2 accommodating a disc-shaped layer 3 of a thermally-insulative and partially infra-red-reflective material, such as a ceramic or microporous material, above which three tubular infra-red lamps 4 to 6 are disposed.
  • the unit 1 is supported on an upstanding, inverted cup-shaped support pedestal 7 having an outwardly-extending side wall 8, which supports the unit 1 adjacent the underside of a pan supportive layer 9 of infra-red-transmissive material, such as glass ceramic, so that the upper surface of the wall of housing 2 contacts the underside of the layer 9.
  • the layer 9 is located by an outer casing 10 which is also connected to the base of the side wall 8 of the pedestal 7, so as to form a base structure for the arrangement.
  • the outer casing 10 and the support side wall 8 are preferably provided with apertures, such as at 11 to 14, to enable ventilating air to circulate through the arrangement and particularly over each end (not shown in Figure 1) of the lamps 4 to 6, these ends being arranged so as to extend out from the interior of the housing 2.
  • the unit 1 may also contain resilient means, such as leaf springs 15 and 16, which are preferably arranged to cross orthogonally and are connected at the cross-over point to bias the unit 1 upwardly towards the underside of the glass ceramic layer 2, thereby providing a clearance below the insulative disc-shaped layer 3 to enable the circulation of air to effect cooling.
  • resilient means such as leaf springs 15 and 16 which are preferably arranged to cross orthogonally and are connected at the cross-over point to bias the unit 1 upwardly towards the underside of the glass ceramic layer 2, thereby providing a clearance below the insulative disc-shaped layer 3 to enable the circulation of air to effect cooling.
  • a cooking pan or other implement containing food to be cooked is positioned on the glass ceramic layer 9, so that energisation of the lamps causes infra-red radiation to be transmitted up through the layer 9 to the cooking implement.
  • the infra-red beating unit 1 shown in Figure 2, illustrates how each end of the lamps 4 to 6 extends out from the interior of the thermally-insulative cylindrical housing 2, so that the cool air convection through the arrangement provides cooling of the lamp ends.
  • the infra-red lamps 4 to 6 include tungsten filaments 17 to 19, respectively, which is preferably of coiled coil type but which may alternatively be of single coil type, supported respectively within quartz tubes 20 to 22.
  • Each end of each lamp, such as 4 is provided with a pinch seal (not shown) having sealed therein an electrical connection between the end of the filament 17 and a flying lead or amp tag or other captive male or female connector (also not shown), which emerges from the pinch seal.
  • a ceramic housing 23 encloses each pinch seal to protect the seal from mechanical shock and infra-red radiation emitted from the lamps 4 to 6.
  • the lamps 4 to 6 are secured in their correct locations by pieces 24 and 25 of thermally-insulative material, such as ceramic fibre, which is shaped so as to provide an oval-shaped central area directly above, and heated by, the lamps 4 to 6, and substantially equal end portions 26 and 27 of all of the lamps are emergent from the interior of the housing 2, so that substantially equal amounts of heat are dissipated from each of the lamps.
  • thermally-insulative material such as ceramic fibre
  • An infra-red-reflective coating (not shown) is also greferably provided on the surface of the quartz tube, such as 20, substantially along its entire length and around the lower half of its circumference.
  • the unit 1 is also preferably provided, at a suitable location therewithin, with a thermal limiter 28, which is arranged to activate a microswitch 29, which effects de-energisation of the lamps, when the operating temperature of the lamps exceeds a predetermined threshold value.
  • the purpose of the limiter 28 is primarily to prevent damage to the glass ceramic layer 9, above the lamps, due to overheating thereof.
  • a metal oxide material such as silica
  • an alternative method of forming the coating may be an ion beam sputtering technique.
  • a lamp 31 as shown in Figure 3 illustrates a coiled coil filament 30 supported within a quartz envelope 32 by a number of spiral supports 33 located at spaced intervals along the length of the filament 30.
  • coiled coil filaments instead of a single coil filament, are advantageous in that coiled coil filaments generally possess substantially greater resilience to mechanical shock, so that the robustness of this type of filament considerably improves the longevity of the lamp.
  • a suitable switching arrangement such as that shown in Figure 4, is preferably provided in the cooking arrangement and is arranged to switch the three lamp filaments 17 to 19 into five series and/or parallel configurations, as shown in Figure 5, to provide five discrete power outputs producing an optimised characteristic heat output curve.
  • the five power outputs correspond respectively to five control settings on a user-operable control (not shown) for the cooking arrangement.
  • the switching arrangement includes the three lamp filaments 17 to 19, filament 18 being the centrally-disposed filament in the heating unit, and two oppositely-directed diodes 34 and 35.
  • Switches 36 to 43 are provided to enable the three filaments 17 to 19 and the two diodes 34 and 35 to be switched into any of the five configurations shown in Figure 5 to produce the required power output of the heating unit.
  • Figure 5 also indicates which of the switches in the arrangement are closed to produce each of the filament configurations.
  • the filaments 17 to 19 are arranged in each configuration so that if the individual power outputs from each of the filaments are not equal in any one configuration, the centrally-disposed fillament 18 is the filament which has a different output to that of the filaments 17 and 19, so that an aesthetically-pleasing balanced effect of the visible radiation emitted from the lamps is maintained.
  • Diode 35 is also used in the lowest power output to provide a balanced visible effect, as well as enabling this low power output to be suitable for simmering purposes.
  • the filament configuration generating the 390W power output includes both diodes 34 and 35, in an oppositely-directed arrangement, which reduces substantially one or more harmonics of the mains power supply which would otherwise cause harmonic disturbances to be carried on the mains supply.
  • the power outputs shown in Figure 5 correspond to the outputs produced by three 400W filaments in the various combinations shown.
  • the lamp filaments may have different power outputs, such as filaments 17 and 19 each having an output of 450W and central filament 18 having an output of 35W, thereby giving a maximum total output of 1250W.
  • four lamps may be utilised, each having a 450W output, for example, producing a maximum total output of 1800W.
  • phase control of the lowest power output shown in Figure 5 may also be used so that the output can be varied from approximately 150W to as low as approximately 3OW, thereby enabling food, plates, etc to be kept warm.
  • a suitable temperature probe may also be used for feed-back temperature control.
  • FIG. 6 An alternative infra-red heating unit is shown in Figure 6, wherein like parts are labelled with like reference numerals with respect to Figure 2.
  • the unit includes a single infra-red lamp 44, having a meandering filament 45, supported within a curved tube 46, thereby reducing the number of pinch seals contained in respective ceramic housings to only two, shown at 47 and 48, and the two ends of the lamp 44 are held in position by a single piece 24 of thermally-insulative material.
  • the meandering serpentine configuration of the lamp 44 may be any desirable configuration and not necessarily that shown in Figure 6.
  • the unit 1 may be any suitable shape rather than cylindrical, to produce any desired shape of the heated area of the glass ceramic layer 9.
  • the thermally-insulative layer 3 may be accommodated within a shallow tray member, preferably made of metal, to provide a suitable support for the layer.
  • the pedestal 7 may be formed from a plastics moulding, for example in a thermoset glass reinforced polyester, and it may also be integrally formed with the outer casing 10.
  • the cooking arrangement may incorporate one or more infra-red heating units to provide a corresponding number of hotplate areas on the glass ceramic layer 9.
  • the arrangement is designed to incorporate not more than two units, so as to provide a relatively compact and portable cooking arrangement, which may be free-standing upon any substantially flat surface.
  • the thermal limiter 28 is not an essential feature of the invention and may be replaced by a suitable thermostat disposed in any suitable location, such as on the disc-shaped layer 3 or on the casing 10, to act as a thermal cut-out to prevent damage caused by overheating of the glass ceramic layer 9 and/or any plastics moulding of the pedestal 7 or casing 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Electric Stoves And Ranges (AREA)
EP85303108A 1984-05-11 1985-05-02 Kocheinrichtung Withdrawn EP0162620A3 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB848412072A GB8412072D0 (en) 1984-05-11 1984-05-11 Heating apparatus
GB8412073 1984-05-11
GB848412073A GB8412073D0 (en) 1984-05-11 1984-05-11 Cooking arrangement
GB8412072 1984-05-11

Publications (2)

Publication Number Publication Date
EP0162620A2 true EP0162620A2 (de) 1985-11-27
EP0162620A3 EP0162620A3 (de) 1987-05-13

Family

ID=26287728

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85303108A Withdrawn EP0162620A3 (de) 1984-05-11 1985-05-02 Kocheinrichtung

Country Status (1)

Country Link
EP (1) EP0162620A3 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0226343A2 (de) * 1985-11-30 1987-06-24 THORN EMI Patents Limited Mikrowellenherd
AU578173B2 (en) * 1985-11-30 1988-10-13 Thorn EMI Patents Ltd. Microwave oven
EP0303314A2 (de) * 1987-08-10 1989-02-15 Philips Patentverwaltung GmbH Verfahren zur schaltstossarmen Leistungssteuerung elektrischer Lasten
EP0991299A2 (de) * 1998-09-30 2000-04-05 BSH Bosch und Siemens Hausgeräte GmbH Kontaktwärmeübertragendes elektrisches Kochsystem und Verfahren zum Betreiben eines entsprechenden Kochsystems
EP1505354A1 (de) * 2002-05-16 2005-02-09 Nippon Electric Glass Co., Ltd Kochfeld

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE620184C (de) * 1935-10-16 Lech Elek Zitaetswerke Akt Ges Elektrisches Strahlungsheizgeraet, insbesondere Kochplatte
DE850324C (de) * 1951-02-18 1952-09-22 Elek Sche Anlagen A G Ges Elektrische Kochplatte
GB1273023A (en) * 1969-02-18 1972-05-03 Electricity Council Improvements in or relating to electric cookers
FR2206643A1 (de) * 1972-11-13 1974-06-07 Polaris Fabrikker As
DE2809131A1 (de) * 1978-03-03 1979-09-13 Ako Werke Gmbh & Co Elektrische kochplatte
EP0117346A2 (de) * 1982-12-24 1984-09-05 THORN EMI Patents Limited Kochplatte

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE620184C (de) * 1935-10-16 Lech Elek Zitaetswerke Akt Ges Elektrisches Strahlungsheizgeraet, insbesondere Kochplatte
DE850324C (de) * 1951-02-18 1952-09-22 Elek Sche Anlagen A G Ges Elektrische Kochplatte
GB1273023A (en) * 1969-02-18 1972-05-03 Electricity Council Improvements in or relating to electric cookers
FR2206643A1 (de) * 1972-11-13 1974-06-07 Polaris Fabrikker As
DE2809131A1 (de) * 1978-03-03 1979-09-13 Ako Werke Gmbh & Co Elektrische kochplatte
EP0117346A2 (de) * 1982-12-24 1984-09-05 THORN EMI Patents Limited Kochplatte

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0226343A2 (de) * 1985-11-30 1987-06-24 THORN EMI Patents Limited Mikrowellenherd
EP0226343A3 (en) * 1985-11-30 1988-03-30 Thorn Emi Patents Limited Microwave oven
AU578173B2 (en) * 1985-11-30 1988-10-13 Thorn EMI Patents Ltd. Microwave oven
EP0303314A2 (de) * 1987-08-10 1989-02-15 Philips Patentverwaltung GmbH Verfahren zur schaltstossarmen Leistungssteuerung elektrischer Lasten
US4871961A (en) * 1987-08-10 1989-10-03 U.S. Philips Corporation Method of controlling the supply of power to electrical loads with a minimum of switching surges
EP0303314A3 (en) * 1987-08-10 1990-09-26 Philips Patentverwaltung Gmbh Method for power control of electric loads without commutation pulse
EP0991299A2 (de) * 1998-09-30 2000-04-05 BSH Bosch und Siemens Hausgeräte GmbH Kontaktwärmeübertragendes elektrisches Kochsystem und Verfahren zum Betreiben eines entsprechenden Kochsystems
EP0991299A3 (de) * 1998-09-30 2002-01-16 BSH Bosch und Siemens Hausgeräte GmbH Kontaktwärmeübertragendes elektrisches Kochsystem und Verfahren zum Betreiben eines entsprechenden Kochsystems
EP1505354A1 (de) * 2002-05-16 2005-02-09 Nippon Electric Glass Co., Ltd Kochfeld
EP1505354A4 (de) * 2002-05-16 2008-10-15 Nippon Electric Glass Co Kochfeld

Also Published As

Publication number Publication date
EP0162620A3 (de) 1987-05-13

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Inventor name: GOODCHILD, GRAHAM HOWLETT

Inventor name: FELLERMAN, BERNARD FREDERICK