EP0070043B1 - Electric cooking plate - Google Patents

Electric cooking plate Download PDF

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Publication number
EP0070043B1
EP0070043B1 EP82108180A EP82108180A EP0070043B1 EP 0070043 B1 EP0070043 B1 EP 0070043B1 EP 82108180 A EP82108180 A EP 82108180A EP 82108180 A EP82108180 A EP 82108180A EP 0070043 B1 EP0070043 B1 EP 0070043B1
Authority
EP
European Patent Office
Prior art keywords
cover plate
hotplate
screw
sheet metal
electric hotplate
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
Application number
EP82108180A
Other languages
German (de)
French (fr)
Other versions
EP0070043A2 (en
EP0070043A3 (en
Inventor
Karl Fischer
Felix Schreder
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.)
EGO Elektro Geratebau GmbH
Original Assignee
EGO Elektro Gerate Blanc und Fischer 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 EGO Elektro Gerate Blanc und Fischer GmbH filed Critical EGO Elektro Gerate Blanc und Fischer GmbH
Priority to DE8080104743T priority Critical patent/DE3064273D1/en
Publication of EP0070043A2 publication Critical patent/EP0070043A2/en
Publication of EP0070043A3 publication Critical patent/EP0070043A3/en
Application granted granted Critical
Publication of EP0070043B1 publication Critical patent/EP0070043B1/en
Expired 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
    • 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
    • F24C7/06—Arrangement or mounting of electric heating elements
    • F24C7/067—Arrangement or mounting of electric heating elements on ranges
    • 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
    • H05B3/70—Plates of cast metal

Definitions

  • the invention relates to an electric hotplate with a hotplate body and a cover plate covering its underside, which is fastened by means of a screw to a pin of the hotplate body, the screw or the like also for fastening the electric hotplate to a stove, a hob or the like. serves.
  • a conventional hotplate of this type is known from CH-A-262 513, DE-C.631 467 and GB-A-451 052.
  • a threaded bolt is screwed into the central pin of the hotplate body and a cover plate is fixed by means of a nut screwed thereon, possibly with the interposition of a spacer sleeve.
  • two screwing operations must be carried out.
  • the threaded bolt protrudes far from the hotplate, so that the packing mass is twice as large as the entire hotplate height and, in addition, an axis offset must be made between adjacent hotplates during transport if you do not want to increase the packing mass even further.
  • the protruding part of the threaded bolt is intended to fasten the hotplate to a bracket by means of a further screwed-on nut, whereby the hotplate is stretched downwards.
  • the object of the invention is to further improve the above-mentioned hotplate in such a way that the mounting and storage or transport costs are reduced when the cover plate is fastened more advantageously.
  • the screw is a hollow cap screw with an external and internal thread, which fixes the cover plate with its head, and into which a fastening screw for the electric hotplate can be screwed.
  • the center bolt was previously used (see CH-A-262 513) to fasten the earth connection.
  • Earth connection cables were often attached to the central threaded bolts by screwing them down.
  • the invention provides an improvement in that at least one sheet metal part with at least one section which projects outward from the central region and is readily bendable is clamped between the screw holding the cover plate, which can be screwed into the center peg of the hotplate, and the cover plate. Earthing cables can be plugged, clamped or welded onto its ends.
  • the same or a corresponding sheet metal part can advantageously also be used to create an anti-rotation device. For this purpose, pins protruding downward from the middle of the usual hotplates were riveted to the cover plate and engaged in corresponding holes in the fastening parts.
  • two of the sections may be preferably of the shroud deflectable ends to prevent rotation of the electric hotplate with fixing parts on the cooker, the cooking hob od g l. work together. These ends can still lie flat against the cover plate during transport and are only bent downwards by approx. 90 ° when they are required to prevent rotation during assembly.
  • an anti-rotation element that does not interfere with transport, in that at least one sleeve-like recess, closed to the interior of the hotplate, is provided in the lower cover plate of the electric hotplate for receiving an anti-rotation pin fastened to a fastening part. So here the cover plate is not interrupted and a countersunk anti-rotation device is still created.
  • the associated pin is not attached to the hotplate here, but rather to the fastening parts, for example a bracket passing under the hotplate, and thus does not interfere with transportation.
  • an electric hotplate 11 which has a hotplate body 12 made of cast iron with an upper flat and closed cooking surface 13.
  • the unheated central zone 14 is lowered, so that an annular cooking surface is created.
  • the hotplate body overlaps on its outer circumference via an overhang edge 15 made of sheet material of essentially U-shaped cross section, which is supported on the raised opening edge 16 of the worktop 17 of an electric cooker or hob.
  • the hotplate In the heated ring area, the hotplate is provided with spirally extending ribs, which likewise form spiral grooves 18 between them, in which heating coils 19 lie in a ceramic investment 20.
  • the edge 21 has a cutout 26 in the form of a square cutout (FIG. 8), in which a corresponding design 27 of the cover plate is placed and thus ensures that the cover plate 24 is secured against rotation on the hotplate body despite a relatively tight seal.
  • the shape 27 of the cover plate in turn ensures that the finished hotplate can be aligned in the circumferential direction during its handling during manufacture. As a result, no inner projection is necessary at the edge 21.
  • Adjoining the step 25 is an area 28 of the cover plate which springs back in relation to the edge area 23 and is adjoined by a central area 29 which projects somewhat in relation to the edge area 23.
  • the hotplate body has a downwardly projecting pin 30, into which a blind threaded bore 31 projects from below.
  • a hollow cap screw 32 which is shown in detail in FIG. 9, is screwed into this threaded bore. It consists of a sheet metal stamping or deep-drawn part with a flange-like head region 33 with a hexagon key surface and an adjoining sleeve-shaped threaded section 34, into which an internal and external thread is pressed or pressed.
  • the screw 32 protrudes through a central hole 36 of the cover plate 24 and is screwed into the thread 35 of the bore 31 so that the cover plate 24 is pressed with its edge region 23 against the lower edge 22 of the edge 21 of the hotplate body 12.
  • a sheet metal part 37 (FIG. 2) is interposed, which has the shape of a sheet metal strip which has a hole 38 on one side through which the screw 32 projects, while the other end is somewhat tapered and with a bent end 39 (FIGS. 1 and 2) comprises an earth line 40.
  • the grounding line can be pressed or welded to the sheet metal part 37.
  • This sheet metal part is simply placed under the screw head 33 in the manner of a washer and enables a safe earth connection. It is particularly advantageous that the sheet metal part lies flat against the underside of the cover plate 24 during manufacture and shipping and is only bent off from it if necessary. The earth connection therefore does not significantly increase the height of the hotplate.
  • FIG. 9 shows on the left-hand side that the contact surface of the head 33 can be provided with a preferably star-shaped corrugation 41. Accordingly, the sheet metal part 37 is provided on its top and bottom and the cover plate 24 (see FIGS. 2 and 15), whereby the screw 32 is secured against accidental loosening. However, it is also possible to provide other types of backup.
  • the hotplate is held in the worktop opening receiving it by a bracket 42, which is supported on the underside of the worktop 17 and has a wrong U-shape. Its long back is stiffened by side bends 43.
  • a cap screw 45 projects through a hole 44 in the middle of the bracket and is screwed into the internal thread in the hollow screw 32.
  • Screw 32 is a simple stamped sheet metal part and screw 45 is a simple machine screw. So far, the hot plates have been provided with bolts which were screwed into the pin 30 and which protruded far beyond the underside of the hot plate.
  • An upwardly projecting pin 47 is riveted to the bracket 42, which in one piece in a sleeve-like manner from the cover plate inwards molded recess 46 engages and thus secures the hotplate against rotation against the bracket.
  • several recesses 46 can be provided on the circumference, possibly also offset by 90 ° from one another.
  • Fig. 3 shows a variant for the recess 46, which can be selected if the sheet metal from which the cover plate 24 is made should not be subjected to excessive deformation.
  • a separately produced sleeve 46 ' is tightly fastened in an opening of the cover plate 24 by means of a two-sided flange 46 ". It is also possible, for example in the region of the flange 46", with a pressed-in thread for subsequently screwing in a pin Mistake.
  • Fig. 4 shows in a detailed representation that between the edge area 24 of the cover plate 24 and the lower edge 22 of the hotplate edge 21, a sealing ring 25 is interposed, which can have a flat or circular cross-sectional shape and consists of a heat-resistant sealing material. Silicone rubber, asbestos-containing sealing materials etc. are suitable for this. Further seal designs are shown in FIGS. 5 and 6, wherein in FIG. 5 the seal 25a consists of a paste which has been introduced into the angle between the edge region 23 and the step 25 and which, when pressed on, passes over the lower edge 22 and the inside of the edge 21 distributed. In this embodiment, the possibility of sealing in the region of the recess 26 is particularly advantageous.
  • This sealing ring can consist of a molding compound which is made from an alumina-silicate fiber and is impregnated with a varnish based on silicone resin.
  • the seal is intended to prevent moisture from penetrating into the interior 48 of the hotplate and thus possibly. in the investment 20 to avoid when the hotplate is exposed to extreme conditions, such as sea transport. Although the hotplate immediately expels any moisture that may have entered itself without generating previously unacceptable leakage currents, the seal represents an additional security.
  • the seal is made possible in particular by the cover plate being placed on the lower flange, because this seals the seal into one Range comes lower temperature and can be designed better. Previous cover plates were on the underside of the investment material 20. Level 25 ensures additional sealing and perfect centering.
  • edge 21 'of the hotplate body has a step-shaped recess 49 on its inner underside, so that an outer circumferential edge section 50 of the edge 21' is formed, which extends somewhat further downward than the contact surface for the edge area 23 of the cover plate 24.
  • edge 21 'of the hotplate body has a step-shaped recess 49 on its inner underside, so that an outer circumferential edge section 50 of the edge 21' is formed, which extends somewhat further downward than the contact surface for the edge area 23 of the cover plate 24.
  • a metal foil 51 which is in particular a bare aluminum wrinkle foil, lies approximately parallel to the cover plate in the interior 48. It is clamped between the edge 21 and the cover plate 24 or the seals provided (see FIGS. 4 to 7) and includes a layer 52 between itself and the cover plate 24, which preferably consists of or contains silica gel or diatomaceous earth.
  • This material not only ensures good insulation, but also that the z. B. water penetrated with the air humidity is used in the silica gel serving as a drying agent.
  • the drying agent is always regenerated automatically when the water is expelled, so that it always remains effective.
  • a desiccant it may be appropriate to perforate the metal foil or to place the desiccant in other containers in the interior 48 to ensure its effectiveness.
  • the layer 52 is possible to produce the layer 52 from highly heat-resistant insulating materials, for example inorganic fibers such as asbestos or other known insulating materials. Together with the metal foil lying on top, a very effective insulation is formed, which further reduces the heat losses due to radiation and convection downwards, which are in any case small in the case of a contact hotplate. However, this above all keeps the temperature of the cover plate 24 low, so that it can be installed even in the flattest cooktops near wooden parts in kitchen furniture.
  • highly heat-resistant insulating materials for example inorganic fibers such as asbestos or other known insulating materials.
  • FIG. 10 shows three hotplates stacked one on top of the other, which apart from the fact that the sheet metal part 37 '(see also FIG. 11) is provided with a flat tongue 53 for connecting a corresponding flat connector 54 for the grounding line 40, with the hotplate according to FIG 1 are identical.
  • like reference numerals designate like parts.
  • the cut is in FIG. 10 compared to FIG. 1 offset by 45 °, so that it can be seen that an insulating piece 55, which is supported on the inside of the cover plate 24 and extends through the cover plate 24, contains a temperature limiter in its section lying in the interior 48 and has continuous openings 57 (FIG.
  • connection lines 58 provided with highly heat-resistant insulation protrude from the interior 48, where they are welded with connection pins protruding from the investment material 20.
  • the basic shape of the insulating piece 55 is elongated in the circumferential direction and it projects in the region of a bulge 60 through the cover plate.
  • connection lines 58 are connected to a common connection piece 75 made of ceramic insulating material (FIGS. 10 and 15), which contains plug-in or screw-type connection terminals 76 for connecting current supply lines 78.
  • the width of the depression is significantly larger than that of the insulating piece, so that, as can be seen from FIG. 10 for the two upper hot plates, the connecting lines 58 can be folded inwards and the connecting piece 77 can lie next to the insulating piece in the depression 61 . It is also possible to store the connection piece 77 (FIG. 10 below) folded outward approximately in one plane with the hotplate, the connection lines 58 leading through a corresponding cutout in the packing plate 63.
  • the hotplates with their central axes are stacked one above the other with their flat cooking surfaces 13 and with their undersides covered by the cover plates 24, only a sheet or film 62 being inserted between the cooking surfaces 13 to prevent scratches, while between the hotplates
  • a packing plate 63 is placed on the underside, which can consist of plywood or chipboard and has recesses which are selected such that the hotplate is centered on it when it is placed on it. Parts of the hotplate projecting downward from the outer edge 23 of the cover plate protrude into the recess 64 of the packing plate 63.
  • the hot plates 11 are each offset by 180 ° in the circumferential direction, so that the insulating piece 55 with the connecting lines protrudes into the depression 61 and the hot plate even requires a smaller packing space than its total height.
  • the edges 21 are supported with the interposition of the packing plate 63, in that a solid stack is formed which does not tend to tip over.
  • the aligned arrangement of the hot plates also contributes to this.
  • the packing plates 63 have numerous recesses 64 side by side and one behind the other in accordance with the desired packaging or pallet size, so that a large number of hot plates can be stored and transported in a solid block, not only saving on storage and transport costs, but also accident safety elevated. Packing can also be done fully automatically using grippers.
  • FIGS. 12 to 15 Another device is shown in FIGS. 12 to 15 in order to ensure that the hotplate is secured against rotation relative to fastening parts, for example the bracket 42.
  • a sheet metal part 65 is used, which has the shape of a flat right-angled strip which extends in the area of the bend 66. Lateral incisions 67 separate edge areas at the ends of the sections 68, which are bent or rolled up around the ends (see in particular FIG. 13), so that the ends are pin-like.
  • U-shaped cutouts 70 are provided in the sections 68, so that sheet metal tabs 71 are formed which are bent out of the plane of the sections 68. 14 shows this sheet metal part 65 in the installed state.
  • the ends 69 are preferably only when the hotplate is installed in a stove or the like. bent by about 90 °, which is easily possible due to the incisions 67. It is only necessary to bend the end 69 which is to be inserted into a hole 73 in the mounting bracket 42 '. An anti-rotation lock is also created here without increasing the transport space.
  • the anti-rotation sheet metal part 65 could be provided with a third section 37 ", at the end of which a flat tongue 53 is arranged for connecting an earth line.
  • a single part can have a dual function, namely anti-rotation and 15, it is also possible, as shown in Fig. 15, for the sheet metal part 37 'to be screwed on in addition to the anti-rotation sheet metal part 65 by means of the screw 32. Since the part 65 is secured against rotation anyway, a corrugation 41 on it is sufficient, without it being necessary on the cover plate.
  • the depression 61 lies diametrically opposite the insulating part 55. It would of course also be possible to provide an offset at a different angle. Accordingly, the depression 61 would also have to be offset by a different angle with respect to the insulating piece 55.
  • the end plate has the advantage that, despite sufficient rigidity, it is easy to manufacture due to the not very deep deformation and creates a well-insulated, closed interior.
  • the cover could rest on the outer edge 21 as well as on the inner edge surrounding the sensor recess with one step following the cover plate. The fastening could also be done there using banjo bolts. In this case, the pin with the internal thread would not lie centrally but, for example, in the area of the outer edge.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Baking, Grill, Roasting (AREA)
  • Resistance Heating (AREA)
  • Electric Stoves And Ranges (AREA)
  • Cookers (AREA)
  • Table Devices Or Equipment (AREA)

Description

Die Erfindung betrifft eine Elektrokochplatte mit einem Kochplattenkörper und einem deren Unterseite abdeckenden Abdeckblech, das mittels einer Schraube an einem Zapfen des Kochplattenkörpers befestigt ist, wobei die Schraube auch zur Befestigung der Elektrokochplatte an einem Herd, einer Kochmulde o.dgl. dient.The invention relates to an electric hotplate with a hotplate body and a cover plate covering its underside, which is fastened by means of a screw to a pin of the hotplate body, the screw or the like also for fastening the electric hotplate to a stove, a hob or the like. serves.

Eine übliche Kochplatte dieser Art ist aus der CH-A-262 513, der DE-C.631 467 und der GB-A-451 052 bekannt geworden. In den mittleren Zapfen des Kochplattenkörpers ist ein Gewindebolzen eingeschraubt und ein Abdeckblech ist mittels einer darauf geschraubten Mutter ggf. unter Zwischenschaltung einer Abstandshülse festgelegt. Um das untere Abdeckblech der Elektrokochplatte sicher festzulegen, müssen also zwei Schraubvorgänge vorgenommen werden. Ausserdem steht der Gewindebolzen weit aus der Kochplatte vor, so dass die Packmasse doppelt so gross sind wie die gesamte Kochplattenhöh- und darüber hinaus bei dem Transport ein Achsversatz zwischen benachbarten Kochplatten vorgenommen werden muss, wenn man Packmasse nicht noch weiter vergrössern will. Der herausragende Teil des Gewindebolzens ist dazu bestimmt, die Kochplatte an einem Bügel durch eine weitere aufgeschraubte Mutter zu befestigen, wodurch die Kochplatte nach unten gespannt wird.A conventional hotplate of this type is known from CH-A-262 513, DE-C.631 467 and GB-A-451 052. A threaded bolt is screwed into the central pin of the hotplate body and a cover plate is fixed by means of a nut screwed thereon, possibly with the interposition of a spacer sleeve. In order to securely fix the lower cover plate of the electric hotplate, two screwing operations must be carried out. In addition, the threaded bolt protrudes far from the hotplate, so that the packing mass is twice as large as the entire hotplate height and, in addition, an axis offset must be made between adjacent hotplates during transport if you do not want to increase the packing mass even further. The protruding part of the threaded bolt is intended to fasten the hotplate to a bracket by means of a further screwed-on nut, whereby the hotplate is stretched downwards.

Aufgabe der Erfindung ist es, die eingangs erwähnte Kochplatte dahingehend weiter zu verbessern, dass bei einer vorteilhafteren Befestigung des Abdeckbleches der Montage- und Lager- bzw. Transportaufwand verringert wird.The object of the invention is to further improve the above-mentioned hotplate in such a way that the mounting and storage or transport costs are reduced when the cover plate is fastened more advantageously.

Diese Aufgabe wird gemäss der Erfindung dadurch gelöst, dass die Schraube eine hohle Kopfschraube mit einem Aussen- und Innengewinde ist, die mit ihrem Kopf das Abdeckblech festlegt, und in die eine Befestigungsschraube für die Elektrokochplatte einschraubbar ist.This object is achieved according to the invention in that the screw is a hollow cap screw with an external and internal thread, which fixes the cover plate with its head, and into which a fastening screw for the electric hotplate can be screwed.

Es ist also bei der Kochplattenfertigung nur notwendig, die hohle Schraube einzuschrauben und das Abdeckblech festzulegen. Bei der späteren Montage der Kochplatte wird dann eine übliche Kopfschraube verwendet, um die Kochplatte festzulegen. Die Hohlschraube ist besser zu sichern und der Verpackungs- und Transportaufwand wird verringert. Ausserdem ist die Anpassungsfähigkeit an unterschiedliche Einbauhöhen leichter möglich, indem man einfach andere Kopfschrauben verwendet.It is therefore only necessary for the production of hot plates to screw in the hollow screw and fix the cover plate. When the hotplate is later installed, a conventional cap screw is then used to fix the hotplate. The banjo bolt is easier to secure and the packaging and transport costs are reduced. It is also easier to adapt to different installation heights by simply using other cap screws.

Der Mittelbolzen wurde früher (siehe CH-A-262 513) auch zur Befestigung des Erdanschlusses verwendet. Dabei wurden häufig Erdanschlussleitungen auf den mittleren Gewindebolzen durch Festschrauben aufgesetzt. Auch hier schafft die Erfindung eine Verbesserung, indem zwischen der das Abdeckblech haltenden, in den Mittelzapfen der Kochplatte einschraubbaren Schraube und dem Abdeckblech wenigstens ein Blechteil mit wenigstens einem von dem Mittelbereich nach aussen hinwegragenden, gut abbiegbaren Abschnitt zwischengespannt ist. An dessen Enden können Erdungsleitungen aufgesteckt, festgeklemmt oder festgeschweisst werden. Ein gleiches oder entsprechendes Blechteil kann vorteilhaft auch verwendet werden, um eine Verdrehsicherung zu schaffen. Hierzu waren an den üblichen Kochplatten ausserhalb der Mitte nach unten ragende Stifte an dem Abdeckblech festgenietet, die in entsprechende Löcher an den Befestigungsteilen eingriffen.The center bolt was previously used (see CH-A-262 513) to fasten the earth connection. Earth connection cables were often attached to the central threaded bolts by screwing them down. Here, too, the invention provides an improvement in that at least one sheet metal part with at least one section which projects outward from the central region and is readily bendable is clamped between the screw holding the cover plate, which can be screwed into the center peg of the hotplate, and the cover plate. Earthing cables can be plugged, clamped or welded onto its ends. The same or a corresponding sheet metal part can advantageously also be used to create an anti-rotation device. For this purpose, pins protruding downward from the middle of the usual hotplates were riveted to the cover plate and engaged in corresponding holes in the fastening parts.

Nach einem vorteilhaften Merkmal der Erfindung können vorzugsweise zwei der Abschnitte von dem Abdeckblech abbiegbare Enden haben, die zur Verdrehsicherung der Elektrokochplatte mit Befestigungsteilen an dem Herd, der Kochmulde o.dgl. zusammenwirken. Diese Enden können also während des Transportes noch flach am Abdeckblech anliegen und werden erst dann um ca. 90° nach unten abgebogen, wenn sie zur Verdrehsicherung bei der Montage benötigt werden. Es ist vorteilhaft auch möglich, ein beim Transport nicht störendes Verdrehsicherungselement zu schaffen, indem in dem unteren Abdeckblech der Elektrokochplatte wenigstens eine zum Kochplatteninneren geschlossene, hülsenartige Vertiefung zur Aufnahme eines an einem Befestigungsteil befestigten Verdrehsicherungsstiftes vorgesehen ist. Hier wird also das Abdeckblech nicht unterbrochen und trotzdem eine versenkte Verdrehsicherung geschaffen. Der zugehörige Stift ist hier nicht an der Kochplatte, sondern an den Befestigungsteilen, beispielsweise einem unter der Kochplatte hindurchgehenden Bügel befestigt und stört somit nicht beim Transport.According to an advantageous feature of the invention two of the sections may be preferably of the shroud deflectable ends to prevent rotation of the electric hotplate with fixing parts on the cooker, the cooking hob od g l. work together. These ends can still lie flat against the cover plate during transport and are only bent downwards by approx. 90 ° when they are required to prevent rotation during assembly. It is also advantageously possible to create an anti-rotation element that does not interfere with transport, in that at least one sleeve-like recess, closed to the interior of the hotplate, is provided in the lower cover plate of the electric hotplate for receiving an anti-rotation pin fastened to a fastening part. So here the cover plate is not interrupted and a countersunk anti-rotation device is still created. The associated pin is not attached to the hotplate here, but rather to the fastening parts, for example a bracket passing under the hotplate, and thus does not interfere with transportation.

Weitere Vorteile und Merkmale der Erfindung gehen aus den Unteransprüchen und der Beschreibung im Zusammenhang mit den Zeichnungen hervor. Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden im folgenden näher erläutert. Es zeigen:

  • Fig. 1 einen Querschnitt durch eine in einen Elektroherd, eine Kochmulde o.dgl. eingebaute Elektrokochplatte,
  • Fig. 2 eine Detailansicht, geschnitten nach der Linie 11-11 in Fig. 1,
  • Fig. 3 einen Schnitt durch eine Variante eines Details aus Fig. 1,
  • Fig. 4 das durch den strichpunktierten Kreis IV in Fig. 1 gekennzeichnete Detail in vergrössertem Massstab,
  • Fig. 5 bis 7 Varianten des Details nach Fig. 4,
  • Fig. 8 eine Detailansicht in Richtung des Pfeils VIII in Fig. 1 gesehen,
  • Fig. 9 eine vergrösserte Darstellung des Details der Mittelbefestigung der Kochplatte nach Fig. 1,
  • Fig. 10 drei übereinandergestapelte Kochplatten, die bis auf den Erdanschluss derjenigen nach
  • Fig. 1 entsprechen und die zugehörigen Verpakkungsmittel,
  • Fig. 11 eine Detail-Draufsicht nach dem Pfeil XI in Fig. 10,
  • Fig. 12 ein zur Verdrehsicherung und ggf. als Erdanschluss dienendes Blechteil in Draufsicht,
  • Fig. 13 eine teilgeschnittene Ansicht nach der Linie Xlll-XIII in Fig. 12,
  • Fig. 14 einen Detailschnitt durch den unteren Mittelbereich einer Kochplatte im eingebauten Zustand und
  • Fig. 15 die Hinteransicht dieser Kochplatte.
Further advantages and features of the invention emerge from the subclaims and the description in connection with the drawings. Embodiments of the invention are shown in the drawing and are explained in more detail below. Show it:
  • Fig. 1 shows a cross section through the like in an electric stove, a hob or the like. built-in electric hotplate,
  • 2 is a detailed view, sectioned along the line 11-11 in Fig. 1,
  • 3 shows a section through a variant of a detail from FIG. 1,
  • 4 shows the detail identified by the dash-dotted circle IV in FIG. 1 on an enlarged scale,
  • 5 to 7 variants of the detail of FIG. 4,
  • 8 is a detailed view in the direction of arrow VIII in FIG. 1,
  • 9 is an enlarged view of the detail of the central fastening of the hotplate according to FIG. 1,
  • Fig. 10 three stacked hot plates, which except for the ground connection of those
  • 1 correspond and the associated packaging means,
  • 11 is a detailed plan view according to the arrow XI in Fig. 10,
  • 12 is a top view of a sheet metal part for securing against rotation and possibly as an earth connection,
  • 13 is a partially sectioned view along the line Xlll-XIII in Fig. 12,
  • 14 shows a detail section through the lower central region of a hotplate in the installed state and
  • Fig. 15 is the rear view of this hot plate.

In Fig. 1 ist eine Elektrokochplatte 11 dargestellt, die einen aus Gusseisen bestehenden Kochplattenkörper 12 mit einer oberen ebenen und geschlossenen Kochfläche 13 besitzt. Die unbeheizte Mittelzone 14 ist abgesenkt, so dass eine ringförmige Kochfläche entsteht. Der Kochplattenkörper greift an seinem Aussenumfang über einen Überfallrand 15 aus Blechmaterial von im wesentlichen U-förmigem Querschnitt über, der sich auf dem hochgezogenen Öffnungsrand 16 der Arbeitsplatte 17 eines Elektroherdes oder einer Kochmulde abstützt.In Fig. 1, an electric hotplate 11 is shown, which has a hotplate body 12 made of cast iron with an upper flat and closed cooking surface 13. The unheated central zone 14 is lowered, so that an annular cooking surface is created. The hotplate body overlaps on its outer circumference via an overhang edge 15 made of sheet material of essentially U-shaped cross section, which is supported on the raised opening edge 16 of the worktop 17 of an electric cooker or hob.

In dem beheizten Ringbereich ist die Kochplatte mit spiralig verlaufenden Rippen versehen, die zwischen sich ebenfalls spiralige Nuten 18 bilden, in denen Heizwendeln 19 in keramischer Einbettmasse 20 liegen.In the heated ring area, the hotplate is provided with spirally extending ribs, which likewise form spiral grooves 18 between them, in which heating coils 19 lie in a ceramic investment 20.

Im Umfangsbereich des Kochplattenkörpers steht ein nach unten gerichteter im wesentlichen zylindrischer Rand 21 vor, auf dessen Unterkante 22 sich ein flanschartiger Randbereich eines zylindrischen, durch Ausprägungen versteiften und verformten Abdeckbleches abstützt. An den Randbereich 23 schliesst sich eine nach oben, d.h. zur Kochfläche hin gerichtete Stufe 25 an, die auf der Innenseite des Randes 21 anliegt und damit den Abschlussdeckel bzw. das Abdeckblech zentriert.In the circumferential area of the hotplate body there is a downwardly directed, essentially cylindrical edge 21, on the lower edge 22 of which a flange-like edge area of a cylindrical cover plate which is stiffened and deformed by features is supported. At the edge region 23 there is an upward, i.e. step 25 towards the cooking surface, which rests on the inside of the edge 21 and thus centers the end cover or the cover plate.

An einer Stelle des Umfanges hat der Rand 21 eine Aussparung 26 in Form eines viereckigen Ausschnittes (Fig. 8), in die sich eine entsprechende Ausprägung 27 des Abdeckbleches legt und somit trotz eines relativ dichten Abschlusses für eine Verdrehsicherung des Abdeckbleches 24 am Kochplattenkörper sorgt. Die Ausprägung 27 des Abdeckbleches sorgt ihrerseits dafür, dass die fertige Kochplatte bei ihrer Handhabung während der Herstellung in Umfangsrichtung ausgerichtet werden kann. Dadurch ist am Rand 21 kein innerer Vorsprung nötig.At one point on the circumference, the edge 21 has a cutout 26 in the form of a square cutout (FIG. 8), in which a corresponding design 27 of the cover plate is placed and thus ensures that the cover plate 24 is secured against rotation on the hotplate body despite a relatively tight seal. The shape 27 of the cover plate in turn ensures that the finished hotplate can be aligned in the circumferential direction during its handling during manufacture. As a result, no inner projection is necessary at the edge 21.

An die Stufe 25 schliesst sich ein gegenüber dem Randbereich 23 zurückspringender Bereich 28 des Abdeckblechs an und daran ein Mittelbereich 29, der gegenüber dem Randbereich 23 etwas vorspringt.Adjoining the step 25 is an area 28 of the cover plate which springs back in relation to the edge area 23 and is adjoined by a central area 29 which projects somewhat in relation to the edge area 23.

Im Zentrum der unbeheizten Mittelzone 14 besitzt der Kochplattenkörper einen nach unten vorspringenden Zapfen 30, in den von unten her eine Sack- Gewindebohrung 31 hineinragt. In diese Gewindebohrung ist eine hohle Kopfschraube 32 eingeschraubt, die detailiert in Fig. 9 dargestellt ist. Sie besteht aus einem Blechpräge- bzw. Tiefziehteil mit einem flanschartigen Kopfbereich 33 mit einer Sechskant-Schlüsselfläche und einem sich daran anschliessenden hülsenförmigen Gewindeabschnitt 34, in den ein Innen- und Aussengewinde eingedrückt oder eingepresst ist. Die Schraube 32 ragt durch ein Mittelloch 36 des Abdeckbleches 24 hindurch und ist in das Gewinde 35 der Bohrung 31 eingeschraubt, so dass das Abdeckblech 24 mit seinem Randbereich 23 gegen die Unterkante 22 des Randes 21 des Kochplattenkörpers 12 gedrückt wird. Zwischen den Kopf 32 und das Abdeckblech ist ein Blechteil 37 (Fig. 2) zwischengelegt, das die Form eines Blechstreifens hat, der an einer Seite ein Loch 38 hat, durch das die Schraube 32 hindurchragt, während das andere Ende etwas verjüngt ausgebildet ist und mit einem umgebogenen Ende 39 (Fig. 1 und 2) eine Erdungsleitung 40 umfasst. Die Erdungsleitung kann mit dem Blechteil 37 verpresst oder verschweisst sein. Dieses Blechteil wird also einfach nach Art einer Unterlegscheibe unter den Schraubkopf 33 gelegt und ermöglicht einen sicheren Erdanschluss. Dabei ist es besonders vorteilhaft, dass das Blechteil während der Herstellung und des Versandes flach an der Unterseite des Abdeckbleches 24 anliegt und nur dann, wenn es erforderlich ist, etwas von dieser abgebogen wird. Der Erdanschluss erhöht daher die Bauhöhe der Kochplatte nicht erheblich.In the center of the unheated central zone 14, the hotplate body has a downwardly projecting pin 30, into which a blind threaded bore 31 projects from below. A hollow cap screw 32, which is shown in detail in FIG. 9, is screwed into this threaded bore. It consists of a sheet metal stamping or deep-drawn part with a flange-like head region 33 with a hexagon key surface and an adjoining sleeve-shaped threaded section 34, into which an internal and external thread is pressed or pressed. The screw 32 protrudes through a central hole 36 of the cover plate 24 and is screwed into the thread 35 of the bore 31 so that the cover plate 24 is pressed with its edge region 23 against the lower edge 22 of the edge 21 of the hotplate body 12. Between the head 32 and the cover plate, a sheet metal part 37 (FIG. 2) is interposed, which has the shape of a sheet metal strip which has a hole 38 on one side through which the screw 32 projects, while the other end is somewhat tapered and with a bent end 39 (FIGS. 1 and 2) comprises an earth line 40. The grounding line can be pressed or welded to the sheet metal part 37. This sheet metal part is simply placed under the screw head 33 in the manner of a washer and enables a safe earth connection. It is particularly advantageous that the sheet metal part lies flat against the underside of the cover plate 24 during manufacture and shipping and is only bent off from it if necessary. The earth connection therefore does not significantly increase the height of the hotplate.

In Fig. 9 ist auf der linken Seite dargestellt, dass die Anlagefläche des Kopfes 33 mit einer vorzugsweise sternförmigen Riffelung 41 versehen sein kann. Dementsprechend ist auch das Blechteil 37 an seiner Ober- und Unterseite sowie das Abdeckblech 24 (siehe Fig. 2 und 15) versehen, wodurch die Schraube 32 gegen versehentliches Losdrehen gesichert ist. Es ist jedoch auch möglich, andere Sicherungsarten vorzusehen.FIG. 9 shows on the left-hand side that the contact surface of the head 33 can be provided with a preferably star-shaped corrugation 41. Accordingly, the sheet metal part 37 is provided on its top and bottom and the cover plate 24 (see FIGS. 2 and 15), whereby the screw 32 is secured against accidental loosening. However, it is also possible to provide other types of backup.

Die Kochplatte wird in der sie aufnehmenden Arbeitsplattenöffnung durch einen Bügel 42 gehalten, der sich an der Unterseite der Arbeitsplatte 17 abstützt und eine falche U-Form hat. Sein langer Rücken ist durch seitliche Aufbiegungen 43 versteift. Durch ein Loch 44 in der Mitte des Bügels ragt eine Kopfschraube 45, die in das Innengewinde in der hohlen Schraube 32 eingeschraubt ist. Somit wird die Kochplatte durch die Schraube und den Bügel nach unten gespannt und ist sicher festgelegt. Durch diese Art der Befestigung wird nur mit Kopfschrauben gearbeitet, die leicht mit automatischen Schraubern festzuziehen sind. Dabei ist die Schraube 32 ein einfaches Blechprägeteil und die Schraube 45 eine einfache Maschinenschraube. Bisher wurden die Kochplatten mit Schraubbolzen versehen, die in den Zapfen 30 eingeschraubt waren und die weit über die Unterseite der Kochplatte vorstanden. Zwei oder mehr auf diesen Bolzen geschraubte Muttern legten das Abdeckblech und die Kochplatte am Bügel fest. Dadurch war eine raumsparende Verpackung nicht möglich. Vielmehr nimmt die Kochplatte bei der Verpackung nur noch den von ihr selbst benötigten Raum ein und man hat den zusätzlichen Vorteil, dass je nach der Höhe des Bügels die Länge der Schraube 45 gewählt werden kann. Dies ist insbesondere wichtig, wenn es um die Befestigung der Kochplatte in sehr flachen Einbaumulden geht. Es kann somit ein Kochplattentyp für sämtliche Bügelhöhen verwendet werden. Früher mussten die Kochplattentypen hierfür mit unterschiedlich langen Schraubbolzen ausgerüstet sein.The hotplate is held in the worktop opening receiving it by a bracket 42, which is supported on the underside of the worktop 17 and has a wrong U-shape. Its long back is stiffened by side bends 43. A cap screw 45 projects through a hole 44 in the middle of the bracket and is screwed into the internal thread in the hollow screw 32. Thus, the hotplate is clamped down by the screw and the bracket and is securely fixed. This type of attachment only works with cap screws that are easy to tighten with automatic screwdrivers. Screw 32 is a simple stamped sheet metal part and screw 45 is a simple machine screw. So far, the hot plates have been provided with bolts which were screwed into the pin 30 and which protruded far beyond the underside of the hot plate. Two or more nuts screwed onto these bolts fixed the cover plate and the hotplate to the bracket. This made space-saving packaging impossible. Rather, the hotplate only takes up the space that it requires itself during packaging and there is the additional advantage that the length of the screw 45 can be selected depending on the height of the bracket. This is particularly important when it comes to fastening the hotplate in very flat recessed recesses. One type of hotplate can therefore be used for all bracket heights. In the past, the hotplate types had to be equipped with screw bolts of different lengths.

An dem Bügel 42 ist ein nach oben ragender Stift 47 angenietet, der in eine hülsenartige, einstückig aus dem Abdeckblech nach innen herausgeformte Vertiefung 46 eingreift und somit die Kochplatte gegenüber dem Bügel gegen Verdrehung sichert. Um mehrere Einbaumöglichkeiten für die Kochplatte zu ermöglichen, was insbesondere wegen der Lage der Anschlussleitungen wichtig ist, können mehrere Vertiefungen 46 am Umfang, ggf. auch um 90° gegeneinander versetzt, vorgesehen sein. Durch die Anbringung des Verdrehsicherungsstiftes 45 am Bügel statt, wie bisher an der Kochplatte wird dafür gesorgt, dass die Gesamttiefenabmessungen der Kochplatte gering bleiben. Die Vertiefung 46 ist geschlossen, so dass der sich zwischen dem Abdeckblech 24 und dem Kochplattenkörper 12 bildende heisse Innenraum 48 der Kochplatte abgeschlossen ist.An upwardly projecting pin 47 is riveted to the bracket 42, which in one piece in a sleeve-like manner from the cover plate inwards molded recess 46 engages and thus secures the hotplate against rotation against the bracket. In order to enable several installation options for the hotplate, which is particularly important because of the position of the connecting lines, several recesses 46 can be provided on the circumference, possibly also offset by 90 ° from one another. By attaching the anti-rotation pin 45 to the bracket instead of, as before, on the hotplate, it is ensured that the overall depth dimensions of the hotplate remain small. The recess 46 is closed, so that the hot interior 48 of the hotplate which forms between the cover plate 24 and the hotplate body 12 is closed.

Fig. 3 zeigt eine Variante für die Vertiefung 46, die dann gewählt werden kann, wenn das Blech, aus dem die Abdeckplatte 24 besteht, keiner zu grossen Verformung unterworfen werden soll. Es wird eine gesondert hergestellte Hülse 46' durch eine zweiseitige Bördelung 46" in einer Öffnung des Abdeckbleches 24 dicht befestigt. Es ist auch möglich, die Hülse z. B. im Bereich der Börderlung 46" mit einem eingepressten Gewinde zum nachträglichen Einschrauben eines Stiftes zu versehen.Fig. 3 shows a variant for the recess 46, which can be selected if the sheet metal from which the cover plate 24 is made should not be subjected to excessive deformation. A separately produced sleeve 46 'is tightly fastened in an opening of the cover plate 24 by means of a two-sided flange 46 ". It is also possible, for example in the region of the flange 46", with a pressed-in thread for subsequently screwing in a pin Mistake.

Fig. 4 zeigt in einer Detaildarstellung, dass zwischen den Randbereich 24 des Abdeckblechs 24 und die Unterkante 22 des Kochplattenrandes 21 ein Dichtring 25 zwischengelegt ist, der eine flache oder kreisrunde Querschnittsform haben kann und aus einem wärmebeständigen Dichtungsmaterial besteht. Hierfür sind Silikonkautschuk, asbesthaltige Dichtungsmaterialien etc. geeignet. Weitere Dichtungsausführungen sind in den Fig. 5 und 6 gezeigt, wobei in Fig. 5 die Dichtung 25a aus einer Paste besteht, die in den Winkel zwischen dem Randbereich 23 und der Stufe 25 eingebracht wurde und sich beim Anpressen über die Unterkante 22 und die Innenseite des Randes 21 verteilt. Bei dieser Ausführungsform ist die Möglichkeit zur Abdichtung im Bereich der Aussparung 26 besonders vorteilhaft.Fig. 4 shows in a detailed representation that between the edge area 24 of the cover plate 24 and the lower edge 22 of the hotplate edge 21, a sealing ring 25 is interposed, which can have a flat or circular cross-sectional shape and consists of a heat-resistant sealing material. Silicone rubber, asbestos-containing sealing materials etc. are suitable for this. Further seal designs are shown in FIGS. 5 and 6, wherein in FIG. 5 the seal 25a consists of a paste which has been introduced into the angle between the edge region 23 and the step 25 and which, when pressed on, passes over the lower edge 22 and the inside of the edge 21 distributed. In this embodiment, the possibility of sealing in the region of the recess 26 is particularly advantageous.

Fig. 6 zeigt an der entsprechenden Stelle einen vorgefertigten Dichtungsring 25b mit Z-förmigem Querschnitt, der die Unterkante 22, die Innenseite des Randes 21 und ein Stück der Innenfläche des zurückgesetzten Abschnittes 28 des Abdeckbleches 24 überdeckt. Dieser Dichtungsring kann aus einer Pressmasse bestehen, die aus einer Tonerde-Silikat-Faser hergestellt ist und mit einem Lack auf Silikonharzbasis getränkt ist.6 shows at the corresponding point a prefabricated sealing ring 25b with a Z-shaped cross section, which covers the lower edge 22, the inside of the edge 21 and a piece of the inside surface of the recessed section 28 of the cover plate 24. This sealing ring can consist of a molding compound which is made from an alumina-silicate fiber and is impregnated with a varnish based on silicone resin.

Bei einer Verwendung einer Dichtung am Aussenumfang ist es auch ratsam, im Bereich der Schraube 32 eine Abdichtung vorzunehmen.When using a seal on the outer circumference, it is also advisable to make a seal in the area of the screw 32.

Die Dichtung ist dazu bestimmt, ein Eindringen von Feuchtigkeit in den Innenraum 48 der Kochplatte und damit u.U. in die Einbettmasse 20 zu vermeiden, wenn die Kochplatte extremen Bedingungen ausgesetzt wird, beispielsweise einem Seetransport. Die Kochplatte treibt zwar evtl. eingedrungene Feuchtigkeit sofort selbst wieder aus, ohne vorher unzulässige Ableitströme zu erzeugen, jedoch stellt die Abdichtung eine zusätzliche Sicherheit dar. Die Dichtung wird insbesondere durch die Auflage des Abdeckbleches auf dem unteren Flansch ermöglicht, weil dadurch die Dichtung in einen Bereich niedrigerer Temperatur kommt und besser ausgelegt werden kann. Bisherige Abdeckbleche lagen auf der Unterseite der Einbettmasse 20 an. Die Stufe 25 sorgt für eine zusätzliche Abdichtung und eine einwandfreie Zentrierung.The seal is intended to prevent moisture from penetrating into the interior 48 of the hotplate and thus possibly. in the investment 20 to avoid when the hotplate is exposed to extreme conditions, such as sea transport. Although the hotplate immediately expels any moisture that may have entered itself without generating previously unacceptable leakage currents, the seal represents an additional security. The seal is made possible in particular by the cover plate being placed on the lower flange, because this seals the seal into one Range comes lower temperature and can be designed better. Previous cover plates were on the underside of the investment material 20. Level 25 ensures additional sealing and perfect centering.

In Fig.7 ist eine Ausführungsform dargestellt, bei der der Rand 21' des Kochplattenkörpers an seiner inneren Unterseite eine stufenförmige Ausdrehung 49 aufweist, so dass ein äusserer umlaufender Randabschnitt 50 des Randes 21' entsteht, der etwas weiter nach unten reicht, als die Auflagefläche für den Randbereich 23 des Abdeckblechs 24. Hier kann bei der nur in Ausnahmefällen gegebenen Gefahr, dass Wasser an der Kochplatte herunterläuft, dieses abtropfen ohne kapillar in den Innenraum 48 gesaugt zu werden.7 shows an embodiment in which the edge 21 'of the hotplate body has a step-shaped recess 49 on its inner underside, so that an outer circumferential edge section 50 of the edge 21' is formed, which extends somewhat further downward than the contact surface for the edge area 23 of the cover plate 24. Here, with the only exceptional risk that water runs down the hotplate, it can drip without being sucked into the interior 48 by capillary action.

Aus Fig. 1 ist zu erkennen, dass etwa parallel zum Abeckblech im Innenraum 48 eine Metallfolie 51 liegt, die insbesondere ein blanke Aluminium-Knitterfolie ist. Sie ist zwischen dem Rand 21 und dem Abdeckblech 24 bzw. den vorgesehenen Dichtungen (siehe Fig. 4 bis 7) eingespannt und schliesst zwischen sich und dem Abdeckblech 24 eine Schicht 52 ein, die vorzugsweise aus Silicagel oder Kieselgur besteht bzw. dieses enthält. Dieses Material sorgt nicht nur für eine gute Isolation, sondern auch dafür, dass das z. B. mit der Luftfeuchtigkeit eingedrungenes Wasser in dem als Trocknungsmittel dienenden Silikagel aufgenommen wird. Infolge der automatischen Erhitzung während des Betriebes der Kochplatte wird das Trocknungsmittel stets von selbst bei der Austreibung des Wassers regeneriert, so dass es stets wirksam bleibt. Wenn man ein Trocknungsmittel verwendet, kann es angebracht sein, die Metallfolie zu lochen oder das Trocknungsmittel in anderen Behältnissen in den Innenraum 48 einzubringen, um siene Wirksamkeit sicherzustellen.It can be seen from FIG. 1 that a metal foil 51, which is in particular a bare aluminum wrinkle foil, lies approximately parallel to the cover plate in the interior 48. It is clamped between the edge 21 and the cover plate 24 or the seals provided (see FIGS. 4 to 7) and includes a layer 52 between itself and the cover plate 24, which preferably consists of or contains silica gel or diatomaceous earth. This material not only ensures good insulation, but also that the z. B. water penetrated with the air humidity is used in the silica gel serving as a drying agent. As a result of the automatic heating during operation of the hotplate, the drying agent is always regenerated automatically when the water is expelled, so that it always remains effective. If a desiccant is used, it may be appropriate to perforate the metal foil or to place the desiccant in other containers in the interior 48 to ensure its effectiveness.

Falls extreme Bedingungen bezüglich Feuchtigkeitsanfalls nicht zu befürchten sind, ist es möglich, die Schicht 52 aus hoch wärmebeständigen Isoliermaterialien herzustellen, beispielsweise anorganischen Fasern wie Asbest oder anderen bekannten Isoliermaterialien. Zusammen mit der darüber liegenden Metallfolie bildet sich eine sehr wirksame Isolation, die die bei einer Kontaktkochplatte ohnehin geringen Wärmeverluste durch Abstrahlung und Konvektion nach unten weiter verringert. Dadurch wird jedoch vor allem die Temperatur des Abdeckblechs 24 gering gehalten, so dass ein Einbau auch in flachsten Kochmulden in der Nähe von Holzteilen bei Küchenmöbeln möglich ist.If extreme conditions with regard to the occurrence of moisture are not to be feared, it is possible to produce the layer 52 from highly heat-resistant insulating materials, for example inorganic fibers such as asbestos or other known insulating materials. Together with the metal foil lying on top, a very effective insulation is formed, which further reduces the heat losses due to radiation and convection downwards, which are in any case small in the case of a contact hotplate. However, this above all keeps the temperature of the cover plate 24 low, so that it can be installed even in the flattest cooktops near wooden parts in kitchen furniture.

In Fig. 10 sind drei übereinandergestapelte Kochplatten dargestellt, die bis auf die Tatsache, dass das Blechteil 37' (siehe auch Fig. 11) mit einer Flachsteckzunge 53 zum Anschluss eines entsprechenden Flachsteckers 54 für die Erdungsleitung 40 versehen ist, mit der Kochplatte nach Fig. 1 identisch sind. In der ganzen Beschreibung bezeichnen gleiche Bezugszeichen gleiche Teile. Die Schnittführung ist in Fig. 10 gegenüber Fig. 1 um 45° versetzt, so dass zu erkennen ist, dass durch das Abdeckblech 24 ein sich innen an diesem abstützendes Isolierstück 55 hindurchragt, das in seinem im Innenraum 48 liegenden Abschnitt einen Temperaturbegrenzer enthält und durchgehende Öffnungen 57 hat (Fig. 15) durch die mit einer hoch wärmebeständigen Isolierung versehene Anschlussleitungen 58 aus dem Innenraum 48, wo sie mit aus der Einbettmasse 20 herausragenden Anschlussstiften verschweisst sind, hindurchragen. Die Grundform des Isolierstücks 55 ist in Umfangsrichtung langgestreckt und es ragt im Bereich einer Ausbauchung 60 durch das Abdeckblech hindurch.10 shows three hotplates stacked one on top of the other, which apart from the fact that the sheet metal part 37 '(see also FIG. 11) is provided with a flat tongue 53 for connecting a corresponding flat connector 54 for the grounding line 40, with the hotplate according to FIG 1 are identical. Throughout the description, like reference numerals designate like parts. The cut is in FIG. 10 compared to FIG. 1 offset by 45 °, so that it can be seen that an insulating piece 55, which is supported on the inside of the cover plate 24 and extends through the cover plate 24, contains a temperature limiter in its section lying in the interior 48 and has continuous openings 57 (FIG. 15) through which Connection lines 58 provided with highly heat-resistant insulation protrude from the interior 48, where they are welded with connection pins protruding from the investment material 20. The basic shape of the insulating piece 55 is elongated in the circumferential direction and it projects in the region of a bulge 60 through the cover plate.

Die Anschlussleitungen 58 sind mit einem gemeinsamen Anschlussstück 75 aus keramischem Isoliermaterial verbunden (Fig. 10 u. 15), das Steck- oder Schraubanschlussklemmen 76 für den Anschluss von Stromzuleitungen 78 enthält. Durch die Anordnung des Isolierstücks in radialer Richtung etwa in der Mitte des ringförmigen beheizten Bereiches bzw. im Bereich zwischen 2/3 bis % der Kochplattenradius von der Kochplattenmitte entfernt, und die Bemessung der Anschlussleitungen, liegt die Aussenkante 77 des Anschlussstükkes 75 vorzugsweise maximal in einem Abstand von weniger als einem Kochplattenradius von deren Aussenkante entfernt und lässt sich flexibel den Einbaubedingungen anpassen, wobei die nebeneinanderliegenden Anschlussleitungen wie ein flexibles Band wirken, das eine leichte Schwenkbarkeit und grössere Beweglichkeit des Anschlussstückes in vertikaler Richtung zulässtk jedoch eine Verdrehung und seitliche Bewegung stärker beschränkt.The connection lines 58 are connected to a common connection piece 75 made of ceramic insulating material (FIGS. 10 and 15), which contains plug-in or screw-type connection terminals 76 for connecting current supply lines 78. The arrangement of the insulation piece in the radial direction approximately in the center of the annular heated zone and in the range between 2/3 to% of the cooking plate radius from the cooking plate center, and the dimensioning of the connection lines, is the outer edge 77 of the Anschlussstükkes 75 preferably at most in a Distance from less than a hotplate radius from its outer edge and can be flexibly adapted to the installation conditions, whereby the adjacent connection lines act like a flexible band, which allows easy swiveling and greater mobility of the connection piece in the vertical direction, but limits rotation and lateral movement more.

Dem Isolierstück 55 diametral gegenüber und in entsprechendem radialen Abstand von der Kochplattenmitte befindet sich im Abdeckblech 24 eine Vertiefung 61, die in ihren Abmessungen so gewählt ist, dass sie den vorspringenden Teil des Isolierstückes in der in Fig. 10 dargestellten gegenseitigen Zuordnung der Kochplatte mit Sicherheit aufnehmen kann, ohne dass die Anschlussleitungen 58 zu scharf abgeknickt werden. Die Breite der Vertiefung ist wesentlich grösser als die des Isolierstückes, so dass, wie aus Fig. 10 bei den beiden oberen Kochplatten zu erkennen ist, die Anschlussleitungen 58 nach innen geklappt werden können und das Anschlussstück 77 neben dem Isolierstück in der Vertiefung 61 liegen können. Es ist auch möglich, das Anschlussstück 77 (Fig. 10 unten) nach aussen geklappt etwa in einer Ebene mit der Kochplatte zu lagern, wobei die Anschlussleitungen 58 durch einen entsprechenden Ausschnitt der Packplatte 63 hindurchführen.The insulating piece 55 diametrically opposite and at a corresponding radial distance from the center of the hotplate there is a recess 61 in the cover plate 24, the dimensions of which are selected such that they reliably enclose the projecting part of the insulating piece in the mutual assignment of the hotplate shown in FIG. 10 can record without the connecting lines 58 being kinked too sharply. The width of the depression is significantly larger than that of the insulating piece, so that, as can be seen from FIG. 10 for the two upper hot plates, the connecting lines 58 can be folded inwards and the connecting piece 77 can lie next to the insulating piece in the depression 61 . It is also possible to store the connection piece 77 (FIG. 10 below) folded outward approximately in one plane with the hotplate, the connection lines 58 leading through a corresponding cutout in the packing plate 63.

Durch die Vertiefung im Abdeckblech ist es möglich, die Kochplatten bei Lagerung und Versand besonders raumsparend und sicher zu verpacken. Dazu werden die Kochplatten mit ihren Mittelachsen fluchtend jeweils mit ihren ebenen Kochflächen 13 und mit ihren von den Abdeckblechen 24 überdeckten Unterseiten gegeneinander gerichtet übereinandergestapelt, wobei zwischen den Kochflächen 13 zum Verhindern von Verkratzungen lediglich ein Blatt oder eine Folie 62 eingelegt wird, während zwischen die Kochplatten-Unterseiten eine Packplatte 63 gelegt ist, die aus Sperrholz oder Pressspan bestehen kann und Ausnehmungen besitzt, die so gewählt sind, dass die Kochplatte beim Auflegen auf sie zentriert wird. Gegenüber dem Aussenrand 23 der Abdeckplatte nach unten vorspringende Teile der Kochplatte ragen in die Ausnehmung 64 der Packplatte 63 hinein.Due to the deepening in the cover plate, it is possible to pack the hot plates in a particularly space-saving and safe manner during storage and shipping. For this purpose, the hotplates with their central axes are stacked one above the other with their flat cooking surfaces 13 and with their undersides covered by the cover plates 24, only a sheet or film 62 being inserted between the cooking surfaces 13 to prevent scratches, while between the hotplates A packing plate 63 is placed on the underside, which can consist of plywood or chipboard and has recesses which are selected such that the hotplate is centered on it when it is placed on it. Parts of the hotplate projecting downward from the outer edge 23 of the cover plate protrude into the recess 64 of the packing plate 63.

Die Kochplatten 11 sind in Umfangsrichtung jeweils um 180° gegeneinander versetzt, so dass das Isolierstück 55 mit den Anschlussleitungen in die Vertiefung 61 hineinragt und die Kochplatte sogar einen geringeren Packraum benötigt, als ihrer Gesamthöhe entspricht. Die Ränder 21 stützen sich unter Zwischenlage der Packplatte 63, indem ein fester Stapel gebildet wird, der nicht zum Umkippen neigt. Dazu trägt insbesondere auch die übereinander fluchtende Anordnung der Kochplatten bei. Die Packplatten 63 haben entsprechend der gewünschten Verpackungs- bzw. Palettengrösse zahlreiche Ausnehmungen 64 nebeneinander und hintereinander, so dass eine grosse Anzahl von Kochplatten in einem massiven Block gelagert und transportiert werden können, dadurch werden nicht nur Lager- und Transportkosten gespart, sondern auch die Unfallsicherheit erhöht. Die Verpackung kann auch vollautomatisch durch Greifer erfolgen.The hot plates 11 are each offset by 180 ° in the circumferential direction, so that the insulating piece 55 with the connecting lines protrudes into the depression 61 and the hot plate even requires a smaller packing space than its total height. The edges 21 are supported with the interposition of the packing plate 63, in that a solid stack is formed which does not tend to tip over. The aligned arrangement of the hot plates also contributes to this. The packing plates 63 have numerous recesses 64 side by side and one behind the other in accordance with the desired packaging or pallet size, so that a large number of hot plates can be stored and transported in a solid block, not only saving on storage and transport costs, but also accident safety elevated. Packing can also be done fully automatically using grippers.

Bei den Kochplatten nach Fig. 10 fehlt die Silicagelfüllung. Es ist lediglich zu Isolationszwecken eine Aluminium-Knitterfolie 51 parallel zum Abdeckblech 24 gelegt.10 is missing the silica gel filling. An aluminum wrinkle film 51 is placed parallel to the cover plate 24 for insulation purposes only.

In den Fig. 12 bis 15 ist eine andere Vorrichtung dargestellt, um die Verdrehsicherung der Kochplatte gegenüber Befestigungsteilen, beispielsweise dem Bügel 42 sicherzustellen. Dazu dient ein Blechteil 65, das die Form eines flachrechtwinkligen Streifens hat, der im Bereich des Knicks 66 hindurchreicht. Seitliche Einschnitte 67 trennen an den Enden der Abschnitte 68 Randbereiche ab, die um die Enden herum zusammengebogen bzw. eingerollt sind (siehe insb. Fig. 13), so dass die Enden stiftartig sind. In den Abschnitten 68 sind U-förmige Ausschnitte 70 vorgesehen, so dass Blechlappen 71 entstehen, die aus der Ebene der Abschnitte 68 hinaus abgebogen sind. Aus Fig. 14 ist dieses Blechteil 65 in eingebautem Zustand zu erkennen. Es ist ebenso wie das Blechteil 37 in Fig. 1 mit der Schraube 32 an der Kochplatte befestigt und an dieser durch den Lappen 71 gegen Verdrehung gesichert, der durch eine Öffnung 72 in der Kochplatte hindurchragt. Anstelle der Öffnung 72 könnte auch eine entsprechende Ausprägung vorgesehen sein, um das Abdeckblech nicht zu durchbrechen. Die Enden 69 werden vorzugsweise erst beim Einbau der Kochplatte in einen Herd o.dgl. um ca. 90° abgebogen, was aufgrund der Einschnitte 67 leicht möglich ist. Dabei braucht nur dasjenige Ende 69 abgebogen zu werden, das in ein Loch 73 des Befestigungsbügels 42' eingeführt werden soll. Auch hier wird eine Verdrehsicherung geschaffen, ohne dass der Transportraum vergrössert wird.Another device is shown in FIGS. 12 to 15 in order to ensure that the hotplate is secured against rotation relative to fastening parts, for example the bracket 42. For this purpose, a sheet metal part 65 is used, which has the shape of a flat right-angled strip which extends in the area of the bend 66. Lateral incisions 67 separate edge areas at the ends of the sections 68, which are bent or rolled up around the ends (see in particular FIG. 13), so that the ends are pin-like. U-shaped cutouts 70 are provided in the sections 68, so that sheet metal tabs 71 are formed which are bent out of the plane of the sections 68. 14 shows this sheet metal part 65 in the installed state. Like the sheet metal part 37 in FIG. 1, it is fastened to the hotplate with the screw 32 and secured against rotation by the tab 71 which projects through an opening 72 in the hotplate. Instead of the opening 72, a corresponding configuration could also be provided so as not to break through the cover plate. The ends 69 are preferably only when the hotplate is installed in a stove or the like. bent by about 90 °, which is easily possible due to the incisions 67. It is only necessary to bend the end 69 which is to be inserted into a hole 73 in the mounting bracket 42 '. An anti-rotation lock is also created here without increasing the transport space.

In Fig. 12 ist strichliert angedeutet, dass das Verdrehsicherungs-Blechteil 65 mit einem dritten Abschnitt 37" versehen sein könnte, an dessen Ende eine Flachsteckzunge 53 zum Anschluss einer Erdungsleitung angeordnet ist. Dadurch kann mit einem einzigen Teil eine doppelte Funktion, nämlich Verdrehsicherung und Erdanschluss bewerkstelligt werden. Es ist jedoch auch möglich, . wie in Fig. 15 gezeigt, dass das Blechteil 37' zusätzlich zum Verdrehsicherungsblechteil 65 durch die Schraube 32 angeschraubt wird. Da das Teil 65 ohnehin verdrehgesichert ist, reicht eine Riffelung 41 auf diesem aus, ohne dass sie am Abdeckblech nötig wäre.In FIG. 12 it is indicated by dashed lines that the anti-rotation sheet metal part 65 could be provided with a third section 37 ", at the end of which a flat tongue 53 is arranged for connecting an earth line. This means that a single part can have a dual function, namely anti-rotation and 15, it is also possible, as shown in Fig. 15, for the sheet metal part 37 'to be screwed on in addition to the anti-rotation sheet metal part 65 by means of the screw 32. Since the part 65 is secured against rotation anyway, a corrugation 41 on it is sufficient, without it being necessary on the cover plate.

Da die Kochplatten vorzugsweise in um 180° versetzter Lage verpackt werden, liegt die Vertiefung 61 dem Isolierteil 55 diametral gegenüber. Es wäre natürlich auch möglich, einen Versatz unter einem anderen Winkel vorzusehen. Dementsprechend müsste die Vertiefung 61 ebenfalls um einen anderen Winkel gegenüber dem Isolierstück 55 versetzt sein. In jedem Fall hat das Abschlussblech den Vorteil, dass es trotz ausreichender Steifigkeit aufgrund der nicht sehr tiefen Verformung leicht herstellbar ist und einen gut isolierenden abgeschlossenen Innenraum schafft. Bei einer Ausführung mit einem Mitteldurchbruch für eine zentrale Fühlerdose könnte die Auflage des Deckels sowohl auf dem Aussenrand 21, als auch auf dem die Fühlerausnehmung umgebenden Innenrand mit einer Stufe dem Abdeckblech folgen. Auch dort könnte die Befestigung mittels Hohlschrauben geschehen. In diesem Falle würde also der Zapfen mit dem Innengewinde nicht zentral sondern beispielsweise im Bereich des Aussenrandes liegen.Since the hot plates are preferably packed in a position offset by 180 °, the depression 61 lies diametrically opposite the insulating part 55. It would of course also be possible to provide an offset at a different angle. Accordingly, the depression 61 would also have to be offset by a different angle with respect to the insulating piece 55. In any case, the end plate has the advantage that, despite sufficient rigidity, it is easy to manufacture due to the not very deep deformation and creates a well-insulated, closed interior. In a version with a central opening for a central sensor socket, the cover could rest on the outer edge 21 as well as on the inner edge surrounding the sensor recess with one step following the cover plate. The fastening could also be done there using banjo bolts. In this case, the pin with the internal thread would not lie centrally but, for example, in the area of the outer edge.

Claims (10)

1. Electric hotplate with a hotplate body (12) and a cover plate (24) covering its bottom surface fixed by means of a screw (32) to a pin (30) of the hotplate body (12), the screw (32) also serving to fix the electric hotplate (11) to a cooker, a cooking depression or the like, characterized in that the screw (32) is a hollow cap screw with an external and an internal thread, which fixes by means of its head (33) the cover plate (24) and into which is screwed a fastening screw (45) for the electric hotplate (11).
2. Electric hotplate according to claim 1, characterized in that the screw (32) is a sheet metal sleeve with flange-like beaded head region (33) and stamped thread.
3. Electric hotplate according to claims 1 or 2, characterized in that on the side of the head region (33) facing the cover plate (24) a corrugation (41) is provided, which optionally cooperates with a preferably radial corrugation (41) on the cover plate (24) or an interposed part (37, 65) for securing screw (32).
4. Electric hotplate according to one of the preceding claims, characterized in that between the screw (32) retaining the cover plate (24) and which can be screwed into a pin (30) of electric hotplate (11) and the cover plate (24) is secured at least one sheet metal part (37, 37', 65) with at least one portion (68) projectable, optionally bendable outwards from the central region, preferably for fitting an earth wire (40).
5. Electric hotplate according to claim 4, characterized in that the sheet metal part (37') is provided with a plug-in connection tongue (53) at its end.
6. Electric hotplate according to one of the claims 4 or 5, characterized in that the portion (68) is provided at its end (69) with a beading for fixing or welding on an earth wire (40).
7. Electric hotplate according to one of the claims 4 to 6, characterized in that preferably two of the portions (68) have ends (69) bendable from the cover plate (24) and which cooperate with fixing parts (42') on the cooker, cooking depression or the like for preventing hotplate (11) from twisting.
8. Electric hotplate according to claim 7, characterized in that the ends (69) are made in pin-like manner in one piece with the sheet metal part (65) from bent together or beaded sheet metal.
9. Electric hotplate according to claims 7 or 8, characterized in that the sheet metal part (65) is fixed in twist-proof manner to the electric hotplate (11) by tabs (71) bent out of the sheet metal material and which penetrate recesses (72) on the cover plate.
10. Electric hotplate according to one of the preceding claims, characterized in that on its lower cover plate (24) is provided at least one sleeve- like depression (46, 46') closed towards the hotplate interior, shaped from the cover plate or fitted to an opening of the latter and which serves to receive a twisting-preventing pin (47) fixed on a fixing part (42) of screwed into the depression.
EP82108180A 1979-08-17 1980-08-12 Electric cooking plate Expired EP0070043B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE8080104743T DE3064273D1 (en) 1979-08-17 1980-08-12 Electric cooking plate

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2933296 1979-08-17
DE19792933296 DE2933296A1 (en) 1979-08-17 1979-08-17 ELECTRIC COOKING PLATE

Related Parent Applications (1)

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EP80104743.2 Division 1980-08-12

Publications (3)

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EP0070043A2 EP0070043A2 (en) 1983-01-19
EP0070043A3 EP0070043A3 (en) 1983-06-01
EP0070043B1 true EP0070043B1 (en) 1986-11-20

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ID=6078643

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EP82108179A Expired EP0070042B1 (en) 1979-08-17 1980-08-12 Electric cooking plate
EP82108180A Expired EP0070043B1 (en) 1979-08-17 1980-08-12 Electric cooking plate
EP80104743A Expired EP0024621B1 (en) 1979-08-17 1980-08-12 Electric cooking plate

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EP82108179A Expired EP0070042B1 (en) 1979-08-17 1980-08-12 Electric cooking plate

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Application Number Title Priority Date Filing Date
EP80104743A Expired EP0024621B1 (en) 1979-08-17 1980-08-12 Electric cooking plate

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US (3) US4348581A (en)
EP (3) EP0070042B1 (en)
JP (1) JPS5631717A (en)
AU (1) AU537864B2 (en)
CA (1) CA1163298A (en)
DE (4) DE2933296A1 (en)
DK (2) DK352880A (en)
ES (1) ES8103906A1 (en)
FI (1) FI67464C (en)
GR (1) GR68424B (en)
HK (1) HK59184A (en)
NO (1) NO153669C (en)
PL (1) PL122796B1 (en)
PT (1) PT71703B (en)
TR (1) TR21050A (en)
YU (1) YU42531B (en)
ZA (1) ZA805011B (en)

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Also Published As

Publication number Publication date
DK69487D0 (en) 1987-02-11
ES494268A0 (en) 1981-03-16
EP0070042B1 (en) 1987-08-19
DE3072014D1 (en) 1987-09-24
US4348581A (en) 1982-09-07
YU42531B (en) 1988-10-31
AU537864B2 (en) 1984-07-19
PL122796B1 (en) 1982-08-31
CA1163298A (en) 1984-03-06
PL226286A1 (en) 1981-02-27
PT71703A (en) 1980-09-01
EP0024621B1 (en) 1983-07-20
HK59184A (en) 1984-08-10
DK352880A (en) 1981-02-18
EP0070042A3 (en) 1983-06-01
ZA805011B (en) 1981-08-26
EP0070043A2 (en) 1983-01-19
US4414466A (en) 1983-11-08
JPS5631717A (en) 1981-03-31
JPH0246206B2 (en) 1990-10-15
YU205080A (en) 1982-08-31
GR68424B (en) 1981-12-29
ES8103906A1 (en) 1981-03-16
NO153669B (en) 1986-01-20
PT71703B (en) 1981-06-25
EP0070042A2 (en) 1983-01-19
DK69487A (en) 1987-02-11
FI802550A (en) 1981-02-18
TR21050A (en) 1983-06-07
FI67464C (en) 1985-03-11
DE3064273D1 (en) 1983-08-25
EP0024621A1 (en) 1981-03-11
DE3071840D1 (en) 1987-01-08
AU6145980A (en) 1981-02-19
FI67464B (en) 1984-11-30
DE2933296A1 (en) 1981-02-26
NO153669C (en) 1986-04-30
NO802436L (en) 1981-02-18
EP0070043A3 (en) 1983-06-01
US4467181A (en) 1984-08-21

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