EP0499972A1 - Heizeinrichtung - Google Patents

Heizeinrichtung Download PDF

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Publication number
EP0499972A1
EP0499972A1 EP19920102457 EP92102457A EP0499972A1 EP 0499972 A1 EP0499972 A1 EP 0499972A1 EP 19920102457 EP19920102457 EP 19920102457 EP 92102457 A EP92102457 A EP 92102457A EP 0499972 A1 EP0499972 A1 EP 0499972A1
Authority
EP
European Patent Office
Prior art keywords
light guide
heating
heating device
light
glass
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Withdrawn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
EP19920102457
Other languages
German (de)
English (en)
French (fr)
Inventor
Günter Gräfe
Henning Von Birckhahn
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.)
MMG GLASTECHNIK GMBH
Original Assignee
MMG GLASTECHNIK GmbH
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 MMG GLASTECHNIK GmbH filed Critical MMG GLASTECHNIK GmbH
Publication of EP0499972A1 publication Critical patent/EP0499972A1/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Withdrawn legal-status Critical Current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
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/08—Arrangement or mounting of control or safety devices
    • F24C7/082—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination
    • F24C7/083—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination on tops, hot plates
    • 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
    • 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

Definitions

  • the invention relates to a heating device with at least one heating element and a cover plate, in particular a glass ceramic plate, on which heating fields are formed by the heating elements arranged underneath, which are optically identified by means of a light guide arranged around the heating element and made of temperature-resistant material.
  • a heating device is known from EP 0 359 028 A1, which is intended in particular for cooking.
  • Several radiant heaters as radiators are arranged side by side and sealed from above by a glass ceramic plate. The outside of the glass ceramic plate forms the base for the cooking vessels.
  • an illuminated display is provided as optical identification.
  • This light indicator consists of a light guide, which has the shape of a glass rod and surrounds the heating field in a ring on the outer circumference at a distance. It is provided with light exit points along its length in the form of notches, so that the light can emerge upwards and form the optical effect on the glass ceramic plate on which a corresponding ring-shaped display field is formed.
  • the glass rod with a circular cross-section must be provided with notches at predetermined points in order to be functional and must also be bent so that it can be placed in a circle around the heating field.
  • the notches must be arranged in very geometrically clean and precisely defined positions on the radial circumferential surface of the glass rod, since otherwise the light emerging from them does not reach upwards in the direction of the glass ceramic plate, but downwards, to the side or at unintended places on the glass ceramic plate .
  • the object of the invention is to propose a heating device with a light guide that is easier to manufacture.
  • the light guide has a cross-sectional shape with two opposing smooth side walls and a non-smooth flat top facing the cover plate.
  • a particularly advantageous and simply constructed embodiment is characterized in that the light guide has a rectangular or square cross section.
  • the light guide in turn surrounds the heating element or the heating field in a ring, its cross-section, in contrast to the prior art, not being circular, but rather rectangular.
  • the surface facing the glass ceramic plate is matted or lapped or is formed by a cutting process during manufacture such that stray light or diffuse light emerges from the light guide upwards. This light only emerges from the surface parallel to the glass ceramic plate and forms a sharply defined ring on the glass ceramic plate.
  • the side walls of the light guide are vertical and smooth, so that the light in the light guide is only reflected inwards and there is no light emission.
  • the fourth, downward-facing edge should also be smoothed. However, since the largest areas are the side areas, while the horizontal areas are top and bottom In terms of size, there are no great demands on smoothness.
  • This shape of the light guide enables it to be designed as a tube section, the tube cross section corresponding to the outside diameter of the heating field.
  • a glass tube that is easy to manufacture and has a corresponding diameter of, for example, 10, 20 or 30 cm is simply cut off in slices to produce the light guides, each slice having a height of approximately 1 to 3 cm. This disc is then placed around the radiator, the outside diameter of which is smaller than the inside diameter of this tube.
  • a light inlet must also be provided in the light guide, for example through a suitable bore through the side walls into which a light source is inserted. Holes can also be provided for the connections to the radiator.
  • An alternative embodiment to the pipe sections is characterized in that the light guide is cut from a flat plate and then bent.
  • This embodiment has the advantage that the bores mentioned can be introduced directly into the flat plates particularly simply before they are cut into strips of uniform width and then bent.
  • the strips would again be 1 to 3 cm wide, the length of the strips would depend on the circumference of the radiator.
  • the light guide consists of three segments each forming 120 ° of the circle surrounding the radiator.
  • the respective connection area of the segments to one another can be used immediately as light entry, for example the light source can be arranged in between.
  • the light guide consists of borosilicate glass.
  • Borosilicate glass has a white edge on the intended rough, matt or lapped surface. This edge absorbs very little light; for example, window glass, on the other hand, has a slight green tint, which is not desirable, especially with a view to the fact that reddish plates are mostly preferred as glass ceramic covers in electric stoves.
  • Plexiglas could also be used instead of borosilicate glass.
  • transparent UV adhesive is used at the intersections of two segments. This has the same refractive index as the borosilicate glass, so that a particularly easy and lossless light transition is created.
  • the shape of the light guide also favors the overall manufacture of the heating device.
  • Known radiators have a bowl-shaped support with an outer sheet metal support shell, which has a substantially flat bottom and approximately vertical walls, which protrude from the floor in a curved manner. The actual heating with the resistance walls is located inside the sheet metal shell. The entire structure of this radiator is therefore approximately cylindrical, the height of the cylinder being approximately 1 to 3 cm.
  • These radiators are usually manufactured in other factories and only delivered and installed for the installation of the heating device, the cooker, etc.
  • the invention now makes it possible for the light guides to still be around the radiator at the manufacturing site be built around and fastened and the radiator together with the light guide transported as a structural unit, stored and finally installed. No special precautions need to be taken to fasten the light guide, since the holes for the electrical connections to be provided for resistance heating can also be used for fastening.
  • the geometric shape of the light guide according to the invention also enables a further particularly preferred embodiment, in which two parallel side walls and a non-smooth, flat upper side are used.
  • This embodiment is characterized in that the light guide is designed so that it also covers the bottom of the radiator in the manner of a petri dish or a pot.
  • the entire shell-shaped body of the sheet metal carrier shell from the prior art can be replaced by glass; the carrier shell and the light guide thus become one and the same element.
  • This option would be particularly material and environmentally friendly and also inexpensive, since the sheet metal support shell is no longer an element and glass is used instead of metal.
  • a preferred light guide would consist of pressed glass.
  • the light guide would thus be produced as a complete unit in one process, a press-blow process also being considered.
  • Another embodiment is suitable for heating devices in which heating fields of non-circular design are to be provided. Such are known, for example, in order to be able to heat roast dishes and other similarly designed cooking vessels.
  • the long oval radiators to be provided in this way can also be surrounded by light guides which have a cross-sectional shape with two opposing smooth side walls and a non-smooth flat top side facing the cover plate.
  • the embodiments according to the invention are also not limited to configurations which require closed light guidance. It is also possible, for example, to surround heating fields with optionally switchable radiators placed directly next to one another, and optionally also with correspondingly switchable light guides.
  • the invention proposes a light ring for identifying the hob in the case of glass ceramic covers on electric stoves. This prevents accidents caused by unconsciously touching the hot surface.
  • the green lighting fixture can be used to signal the switch-on process and the red lighting fixture to indicate the temperature, or when the lighting fixture lights up, such as halogen incandescent lamps, for its full function.
  • a lapped surface can make stray light or a matt surface make diffuse light visible.
  • the full function of the heating field can be displayed by changing the color to yellow.
  • the geometry of the light guide shows the location and size of the heating fields.
  • FIG. 1 and 2 show a heating device 10 according to the invention from above and in section from the side.
  • Four heating fields 11, 12, 13 and 14 can be seen in particular in the top view.
  • the heating fields 11, 12 and 13 are circular, the heating field 14 is circular, but can be expanded into an oval shape by an additional heating field 15.
  • the heating fields 11, 12, 13, 14 and 15 are located on a cover plate 16, in particular a glass ceramic plate, which can be seen in section in FIG. 2 .
  • the heating panels 11 to 15 do not differ in their capacity or its optical appearance of the used not as a heating panel parts of the cover plate 16. They are characterized for heating field, that there are among them radiators, of which in Fig. 2 the radiators 21 and 22 can be seen under the heating fields 11 and 12.
  • the top of the cover plate 16 forms the base for (not shown) cooking vessels on the heating fields.
  • the radiators 21, 22 have a bowl-shaped support 23, 24, which consists of a heat-insulating material.
  • the carrier 23, 24 is surrounded by a carrier shell 25, 26, generally consisting of sheet metal.
  • the actual heating element for example a resistance coil 27, 28, which is indicated in section, is located inside the cup-shaped support 23, 24.
  • the electrical connections and the like usually protrude radially outward from the carrier shell, but are omitted here for clarification. The same applies to the part of the stove located below the heating device.
  • the radiators 21, 22 are surrounded by light guides 31, 32 according to the invention.
  • the light guides 31, 32 surround the radiators in the shape of a cylinder shell, so that only two cut cylinder shell walls can be seen in the section.
  • the upper edge 33 of all light guides faces the cover plate 16.
  • the non-smooth, for example matt or lapped upper side 33 connects two smooth side walls 34 and 35, of which only the outer side 34 can be seen in FIG. 3 .
  • These side walls are so smooth that there is no light emission, but practically 100 percent reflection of the light located in the light guide 31, 32.
  • the underside 36 is preferably also smooth, but because of its relatively small area in relation to the side walls 34 and 35, this area only plays a subordinate role.
  • the light itself is fed into the light guide 31 and 32 via a lighting fixture 41 and a light entry surface 42.
  • the lighting fixture 41 is only shown schematically here; it is controlled, for example, by a temperature sensor or the on / off switch of the associated radiator. It is also possible to replace one Lighting body 41 to provide several, also in different colors.
  • the light guide 31 for the lighting fixture 41 can be completely interrupted; it is also possible to only make a corresponding recess in the light guide 31 or possibly also to couple the light from outside.
  • Fig. 5 shows a preferred embodiment for the light guide 31.
  • This is designed as a tube section, which simplifies the manufacture.
  • Slices are simply cut off from a glass tube, the cut surface being able to be created immediately by a suitable choice of the cutting process in a non-smooth, for example matted form.
  • the cut can also be carried out alternately with a smooth and a matt cut surface, so that the resulting successive glass panes always point to one another with two non-smooth upper sides or two smooth lower sides.
  • FIG. 6 An alternative possibility is given in FIG. 6 . Strips are cut from a flat plate 39, from which the light guide 31 is then bent. In the state of the flat plate, the recess for the lighting element 41 or also for the electrical connections of the heating element 21 can be provided particularly easily.
  • FIG. 7 again shows an enlarged view of a section through the light guide 31.
  • the non-smooth surface 33 and the two opposite smooth side walls 34, 35 can be seen.
  • the light guide 31 forms a rectangular shape, the fourth side, the bottom 36, being parallel to the top 33.
  • the light located in the light guide 31 leads back to the side walls 34, 35 in each case reflected back into the light guide 31.
  • An exit can only on non-smooth surfaces, here on the top 33, so that a light effect can only be observed from the outside. This light emerging there is then used to generate a light ring on the cover plate 16 (see FIG . 2 ).
  • FIG. 8 Another embodiment of the light guide for the heating device is shown in FIG. 8 .
  • the underside 36 of the embodiment from FIG. 7 is relatively unimportant for the function of the invention.
  • the cylindrical design is provided with a bottom, so that the overall shape is a petri dish.
  • the smooth, opposite side walls 34, 35 remain unchanged, as does the non-smooth upper side 33.
  • the lower side 36 is eliminated; instead, the light guide 31 goes down into a bottom 38, the top and bottom of which are smooth. It is the inside or outside of the pot or petri dish that is being formed.
  • This resulting structure can be used to completely replace the sheet metal support shells 25, 26 which conventionally carry the heating element 21, 22.
  • a tray made of glass is created, which has considerable material-saving and environmentally friendly aspects; in particular, the raw materials for glass production are essentially available in unlimited quantities. This would make it unnecessary to provide a separate light guide and the cup-shaped light guide now used can be used both for carrying and for optically identifying the radiator.
  • Borosilicate glass is also preferred here. It is fireproof and has a low coefficient of expansion.
  • the highly pure and pure white version is particularly suitable.
  • the embodiment of Fig. 8 is preferably made of pressed glass.
  • the opposing smooth side walls 34, 35 do not have to be exactly parallel, in particular in this embodiment, in order, for example, to simplify demolding of the press glass.

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)
  • Induction Heating Cooking Devices (AREA)
EP19920102457 1991-02-22 1992-02-14 Heizeinrichtung Withdrawn EP0499972A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4105627 1991-02-22
DE19914105627 DE4105627A1 (de) 1991-02-22 1991-02-22 Leuchtring zur kennzeichnung des kochfeldes bei glaskeramikabdeckungen an elektroherden

Publications (1)

Publication Number Publication Date
EP0499972A1 true EP0499972A1 (de) 1992-08-26

Family

ID=6425696

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920102457 Withdrawn EP0499972A1 (de) 1991-02-22 1992-02-14 Heizeinrichtung

Country Status (2)

Country Link
EP (1) EP0499972A1 (enrdf_load_stackoverflow)
DE (1) DE4105627A1 (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0540876A3 (en) * 1991-11-07 1993-06-02 Bosch-Siemens Hausgeraete Gmbh Cooking hob
GB2301760A (en) * 1995-06-01 1996-12-11 Ceramaspeed Ltd Light indicator arrangement in an electric cooking plate
EP0848212A3 (de) * 1996-12-13 2000-06-21 Schott Glas Befestigungsvorrichtung für als Kochzonenmarkierung und/oder Restwärmeanzeige dienende Lichtleiter
CN100383460C (zh) * 2002-07-04 2008-04-23 乐金电子(天津)电器有限公司 感应式加热灶及其蒸汽排出控制方法
WO2008042805A3 (en) * 2006-09-29 2008-08-21 Bose Corp Method and device for displaying cooking-related information on a cooktop
US20150351163A1 (en) * 2014-05-30 2015-12-03 Samsung Electronics Co., Ltd. Cooking apparatus
EP2947960A4 (en) * 2013-01-17 2016-01-27 Panasonic Ip Man Co Ltd INDUCTION COOKING DEVICE

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3008780B1 (fr) * 2013-07-16 2018-03-02 Schott Ag Appareil de cuisson comportant des elements lumineux
EP3321592A1 (de) 2013-07-16 2018-05-16 Schott Ag Kochgerät mit lichtelementen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1406028A (en) * 1971-05-06 1975-09-10 Belling & Co Ltd Domestic cookers
EP0359028A1 (de) * 1988-09-14 1990-03-21 E.G.O. Elektro-Geräte Blanc u. Fischer Heizeinrichtung
DE3835735A1 (de) * 1988-10-20 1990-04-26 Ako Werke Gmbh & Co Anzeigeeinrichtung eines kochfeldes
EP0437826A2 (de) * 1990-01-17 1991-07-24 E.G.O. Elektro-Geräte Blanc u. Fischer Elektrokocheinrichtung für wenigstens eine Elektrokochplatte

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1406028A (en) * 1971-05-06 1975-09-10 Belling & Co Ltd Domestic cookers
EP0359028A1 (de) * 1988-09-14 1990-03-21 E.G.O. Elektro-Geräte Blanc u. Fischer Heizeinrichtung
DE3835735A1 (de) * 1988-10-20 1990-04-26 Ako Werke Gmbh & Co Anzeigeeinrichtung eines kochfeldes
EP0437826A2 (de) * 1990-01-17 1991-07-24 E.G.O. Elektro-Geräte Blanc u. Fischer Elektrokocheinrichtung für wenigstens eine Elektrokochplatte

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0540876A3 (en) * 1991-11-07 1993-06-02 Bosch-Siemens Hausgeraete Gmbh Cooking hob
GB2301760A (en) * 1995-06-01 1996-12-11 Ceramaspeed Ltd Light indicator arrangement in an electric cooking plate
US5750959A (en) * 1995-06-01 1998-05-12 Ceramaspeed Limited Electric heater
GB2301760B (en) * 1995-06-01 1999-09-22 Ceramaspeed Ltd Electric heater
EP0848212A3 (de) * 1996-12-13 2000-06-21 Schott Glas Befestigungsvorrichtung für als Kochzonenmarkierung und/oder Restwärmeanzeige dienende Lichtleiter
CN100383460C (zh) * 2002-07-04 2008-04-23 乐金电子(天津)电器有限公司 感应式加热灶及其蒸汽排出控制方法
WO2008042805A3 (en) * 2006-09-29 2008-08-21 Bose Corp Method and device for displaying cooking-related information on a cooktop
US7554060B2 (en) 2006-09-29 2009-06-30 England Raymond O Displaying cooking-related information
EP2947960A4 (en) * 2013-01-17 2016-01-27 Panasonic Ip Man Co Ltd INDUCTION COOKING DEVICE
US20150351163A1 (en) * 2014-05-30 2015-12-03 Samsung Electronics Co., Ltd. Cooking apparatus
US10887950B2 (en) * 2014-05-30 2021-01-05 Samsung Electronics Co., Ltd. Cooking apparatus

Also Published As

Publication number Publication date
DE4105627C2 (enrdf_load_stackoverflow) 1993-01-21
DE4105627A1 (de) 1992-08-27

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