EP0136655B1 - Electric cooking plate - Google Patents

Electric cooking plate Download PDF

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Publication number
EP0136655B1
EP0136655B1 EP84111456A EP84111456A EP0136655B1 EP 0136655 B1 EP0136655 B1 EP 0136655B1 EP 84111456 A EP84111456 A EP 84111456A EP 84111456 A EP84111456 A EP 84111456A EP 0136655 B1 EP0136655 B1 EP 0136655B1
Authority
EP
European Patent Office
Prior art keywords
hotplate
heating
heating zones
electric
hotplate body
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
EP84111456A
Other languages
German (de)
French (fr)
Other versions
EP0136655A3 (en
EP0136655A2 (en
Inventor
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 AT84111456T priority Critical patent/ATE35759T1/en
Publication of EP0136655A2 publication Critical patent/EP0136655A2/en
Publication of EP0136655A3 publication Critical patent/EP0136655A3/xx
Application granted granted Critical
Publication of EP0136655B1 publication Critical patent/EP0136655B1/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
    • H05B3/70—Plates of cast metal

Definitions

  • CH-A-187 383 Electric hot plates according to the preamble of claim 1 have become known from CH-A-187 383. These are circular hot plates with a cast body, which consist of separate or connected, heated rings. CH-A-187 383 shows the connection of these rings by means of a sheet metal strip with an expansion bead.
  • an electric hotplate which has an oval shape in plan view and a common heating with inserted electrical heating resistors on its underside. They are used to heat elongated cooking or roasting dishes.
  • FR-A-2 448 693 describes a radiant heater for heating a glass ceramic plate. It consists of a round radiant heating field, which is separated by a web from an adjoining crescent-shaped field, so that an oval field consisting of two heating zones of different sizes is created. With radiant heaters of this type, which work together with a glass ceramic plate running over several cooktops, heating zones of this type which can be switched differently pose no problems. Glass ceramic cooking appliances are, however, generally much more complex and inferior to the cast-iron hot plates in many of their properties.
  • the object of the invention is to provide an electric hotplate made of cast material which is more flexible with regard to the adaptation to different cooking vessels and tasks and which, with a sufficient service life, enables good efficiency.
  • the intermediate area between the two heating zones particularly preferably consists of relatively thick cast material, so that there is no need to fear any warpage of the cast body in this area.
  • an electric hotplate 11 which has a hotplate body 12, which consists of cast material, namely of cast iron.
  • the hotplate body is made from a common cast body, which has the elongated shape shown in FIGS. 1 and 2, and is composed in plan view of two equal-sized arcs and straight lines connecting them.
  • the length corresponds to approximately twice the diameter of the circle plus approx. 1 to 3 cm.
  • the hotplate body is constructed like two circular hotplates arranged next to one another with a double concave intermediate area 24 which connects the two circular heating zones 17, 18 to one another.
  • the zones 17, 18 are identical, but mirror images of each other, and have a common upper flat cooking surface 15.
  • heating resistors 22 are embedded in an insulating investment material in spiral grooves 21, each of which occupies a heating ring region 19, which forms an unheated central zone 20 surrounds.
  • Each circular heating ring region 19 is surrounded by a downward-facing edge 23, to which a projecting flange 35 is connected in the upper outer part.
  • the intermediate area 24 between the two heating zones 17, 18 is plate-shaped and consists of relatively thick cast material of approximately 10 mm thickness, the minimum distance between the edges 23 is 1 to 3 cm (dimension a).
  • An outer section that is inclined outwards and downwards usually reaches over one upstanding edge of a mounting plate and is supported on this. This enables a dense installation of the hotplate.
  • each heating zone there is a temperature limiter 33 which senses the temperature of the hotplate and protects each of the hotplate halves independently of one another against excess temperature.
  • the hotplate is also controlled or regulated by two individually adjustable regulating or control devices 34, but can also be done by a common device with an optional switchover option.
  • the heating ring area 19 of each heating zone 17, 18 is covered by an end cover 38 which rests on the edge 23 and is fastened to a central pin 36 in the central zone 20.
  • Each heating zone has its own connection line.
  • the heating zones 17, 18 can be heated simultaneously or independently of one another without causing undue warping or damage to the hotplate body.
  • the massive construction of the intermediate area 24 contributes to this. Nevertheless, the efficiency of heating only one zone is surprisingly good.

Landscapes

  • Baking, Grill, Roasting (AREA)
  • Cookers (AREA)
  • Insulated Conductors (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Table Devices Or Equipment (AREA)
  • Resistance Heating (AREA)

Abstract

A cast material hotplate with heating resistors embedded in grooves on the bottom surface has an elongated oval shape and on the bottom surface two independent heating zones, which in each case contain substantially circular heating ring zones. In the intermediate area, the casting is separated by a separating gap and tightly interconnected by an inserted sheet metal strip, which is optionally provided with an expansion bead. The sheet metal strip ensures that the flat cooking surfaces are aligned with respect to one another and the double hotplate is suitable for individual cooking vessels, which can be placed on each of the two sides, and for large joint cooking vessels.

Description

Elektrokochplatten nach dem Oberbegriff des Anspruches 1 sind aus der CH-A-187 383 bekanntgeworden. Es handelt sich um kreisrunde Kochplatten mit einem Gusskörper, die aus gesonderten oder zusammenhängenden, beheizten Ringen bestehen. Die CH-A-187 383 zeigt die Verbindung dieser Ringe durch einen Blechstreifen mit Dehnungssicke.Electric hot plates according to the preamble of claim 1 have become known from CH-A-187 383. These are circular hot plates with a cast body, which consist of separate or connected, heated rings. CH-A-187 383 shows the connection of these rings by means of a sheet metal strip with an expansion bead.

Aus dem DE-U-8 103 701 ist eine Elektrokochplatte bekannt, die eine in der Draufsicht ovale Form und an ihrer Unterseite eine gemeinsame Beheizung mit eingelegten elektrischen Heizwiderständen hat. Sie dienen zur Beheizung von langgestreckten Koch- oder Bratgefässen.From DE-U-8 103 701 an electric hotplate is known, which has an oval shape in plan view and a common heating with inserted electrical heating resistors on its underside. They are used to heat elongated cooking or roasting dishes.

In der FR-A-2 448 693 ist ein Strahlungsheizkörper zur Beheizung einer Glaskeramikplatte beschrieben. Er besteht aus einem runden Strahlungsheizfeld, das durch einen Steg von einem daran angrenzenden halbmondförmigen Feld getrennt ist, so dass insgesamt ein ovales, aus zwei unterschiedlich grossen Heizzonen bestehendes Feld entsteht. Bei derartigen Strahlungsheizkörpern, die mit einer über mehrere Kochfelder hinweglaufenden Glaskeramikplatte zusammenarbeiten, bereiten unterschiedlich schaltbare Heizzonen dieser Art keine Probleme. Glaskeramik-Kochgeräte sind jedoch allgemein wesentlich aufwendiger und in vielen ihrer Eigenschaften den Gusskochplatten auch unterlegen.FR-A-2 448 693 describes a radiant heater for heating a glass ceramic plate. It consists of a round radiant heating field, which is separated by a web from an adjoining crescent-shaped field, so that an oval field consisting of two heating zones of different sizes is created. With radiant heaters of this type, which work together with a glass ceramic plate running over several cooktops, heating zones of this type which can be switched differently pose no problems. Glass ceramic cooking appliances are, however, generally much more complex and inferior to the cast-iron hot plates in many of their properties.

Aufgabe der Erfindung ist es, eine Elektrokochplatte aus Gussmaterial zu schaffen, die in bezug auf die Anpassung an unterschiedliche Kochgefässe und Aufgaben flexibler ist und bei ausreichender Standzeit einen guten Wirkungsgrad ermöglicht.The object of the invention is to provide an electric hotplate made of cast material which is more flexible with regard to the adaptation to different cooking vessels and tasks and which, with a sufficient service life, enables good efficiency.

Diese Aufgabe wird durch den Anspruch 1 gelöst.This object is solved by claim 1.

Es wurde bisher angenommen, dass zwei unabhängig beheizbare Heizzonen an einem Kochplattenkörper aus Gussmaterial nicht wirtschaftlich möglich seien, da die ungleichmässigen Wärmespannungen den Kochplattenkörper gefährden und verwerfen und der Wirkungsgrad gering sei. Versuche mit dem Erfindungsgegenstand haben jedoch gezeigt, dass durch den massiven Zwischenbereich die Verwerfungsneigung sehr gering gehalten werden kann und der Wirkungsgrad auch bei Beheizung nur einer Heizzone recht gut ist. So ist die Kochplatte sehr variabel und kann ein oder zwei kleine Kochgefässe auch mit unterschiedlichen Temperaturen und Leistungen beheizen oder ein langgestrecktes Kochgefäss aufnehmen, das sehr gleichmässig beheizt werden kann. Es handelt sich also praktisch um zwei runde Kochflächen, die jeweils auf der einen Seite durch einen unbeheizten Verbindungsteil in Richtung auf die andere Heizzone hin ergänzt ist. In der Praxis ergibt sich dann ein Kochplattenkörper, der in der Draufsicht von zwei Halbkreisen und sie verbindenden Geraden begrenzt ist. Es können aber auch andere Formen, beispielsweise eine ovale Form ohne gerade Ränder verwendet werden, die unter Umständen den Vorteil haben, dass ein die Kochplatte umgebender Überfallrand überall kraftschlüssig angedrückt wird.It has previously been assumed that two independently heatable heating zones on a hotplate body made of cast material are not economically feasible, since the uneven thermal stresses endanger and reject the hotplate body and the efficiency is low. Experiments with the subject matter of the invention have shown, however, that the tendency to warp can be kept very low due to the massive intermediate area and the efficiency is quite good even when only one heating zone is heated. The hotplate is very variable and can heat one or two small cooking vessels with different temperatures and outputs or accommodate an elongated cooking vessel that can be heated very evenly. It is therefore practically two round cooking surfaces, each of which is supplemented on one side by an unheated connecting part in the direction of the other heating zone. In practice, this results in a hotplate body which is delimited in the top view by two semicircles and straight lines connecting them. However, it is also possible to use other shapes, for example an oval shape without straight edges, which may have the advantage that an overflow edge surrounding the hotplate is pressed on non-positively everywhere.

Zwischen den Reglern oder Steuergeräten beider Heizzonen könnte eine elektrische oder mechanische Kopplung vorgesehen sein, um die Bedienung zu vereinfachen. Der Zwischenbereich zwischen den beiden Heizzonen besteht besonders bevorzugt aus relativ dickem Gussmaterial, so dass in diesem Bereich keine Eigenverwerfungen des Gusskörpers zu befürchten sind.An electrical or mechanical coupling could be provided between the controllers or control devices of both heating zones in order to simplify operation. The intermediate area between the two heating zones particularly preferably consists of relatively thick cast material, so that there is no need to fear any warpage of the cast body in this area.

Weitere Merkmale von bevorzugten Weiterbildungen der Erfindungen gehen aus der Beschreibung und den Zeichnungen hervor, wobei diese Merkmale und die der Unteransprüche jeweils für sich allein oder zu mehreren in Form von Unterkombinationen bei einer Ausführungsform der Erfindung verwirklicht sein können. Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher erläutert. Es zeigen:

  • Fig. 1 eine Draufsicht auf eine Elektrokochplatte, und
  • Fig. 2 einen Längsschnitt durch die Kochplatte nach Figur 1.
Further features of preferred developments of the inventions emerge from the description and the drawings, these features and that of the subclaims being able to be realized individually or in groups in the form of subcombinations in one embodiment of the invention. An embodiment of the invention is shown in the drawing and is explained in more detail below. Show it:
  • Fig. 1 is a plan view of an electric hot plate, and
  • 2 shows a longitudinal section through the hotplate according to FIG. 1.

In den Zeichnungen ist eine Elektrokochplatte 11 dargestellt, die einen Kochplattenkörper 12 aufweist, der aus Gussmaterial, und zwar aus Eisenguss besteht. Der Kochplattenkörper ist aus einem gemeinsamen Gusskörper hergestellt, der die in Fig. 1 und 2 gezeigte langgestreckte Form hat, und in der Draufsicht aus zwei gleichgrossen Kreisbögen und diese verbindenden Geraden zusammengesetzt ist.In the drawings, an electric hotplate 11 is shown, which has a hotplate body 12, which consists of cast material, namely of cast iron. The hotplate body is made from a common cast body, which has the elongated shape shown in FIGS. 1 and 2, and is composed in plan view of two equal-sized arcs and straight lines connecting them.

Die Länge entspricht etwa dem doppelten Kreisdurchmesser zuzüglich ca. 1 bis 3 cm. Der Kochplattenkörper ist aufgebaut wie zwei nebeneinander angeordnete kreisrunde Kochplatten mit einem doppelt konkaven Zwischenbereich 24, der die beiden kreisförmigen Heizzonen 17, 18 miteinander verbindet. Die Zonen 17, 18 sind identisch, aber spiegelbildlich zueinander ausgebildet und haben eine gemeinsame obere ebene Kochfläche 15. An jeder ihrer Unterseiten liegen in spiralförmigen Nuten 21 in einer isolierenden Einbettmasse eingebettet Heizwiderstände 22, die jeweils einen Heizringbereich 19 einnehmen, der eine unbeheizte Mittelzone 20 umgibt. Jeder kreisrunde Heizringbereich 19 ist von einem abwärts gerichteten Rand 23 umgeben, an den sich im oberen äusseren Teil ein vorragender Flansch 35 anschliesst. Der Zwischenbereich 24 zwischen den beiden Heizzonen 17, 18 ist plattenförmig und besteht aus relativ dickem Gussmaterial von ca. 10 mm Dicke, der Minimal-Abstand zwischen den Rändern 23 beträgt 1 bis 3 cm (Mass a).The length corresponds to approximately twice the diameter of the circle plus approx. 1 to 3 cm. The hotplate body is constructed like two circular hotplates arranged next to one another with a double concave intermediate area 24 which connects the two circular heating zones 17, 18 to one another. The zones 17, 18 are identical, but mirror images of each other, and have a common upper flat cooking surface 15. On each of their undersides, heating resistors 22 are embedded in an insulating investment material in spiral grooves 21, each of which occupies a heating ring region 19, which forms an unheated central zone 20 surrounds. Each circular heating ring region 19 is surrounded by a downward-facing edge 23, to which a projecting flange 35 is connected in the upper outer part. The intermediate area 24 between the two heating zones 17, 18 is plate-shaped and consists of relatively thick cast material of approximately 10 mm thickness, the minimum distance between the edges 23 is 1 to 3 cm (dimension a).

Auf den Rand 23 und den Rand des Zwischenbereiches 24 ist aussen ein um den gesamten Kochplattenkörper umlaufender Ring oder Überfallrand 30 aus rostfreiem Stahl mit seinem Innenabschnitt 31 aufgepresst, der den Querschnitt eines umgekehrten V oder U hat und sich mit seiner Oberseite 32 an der Unterseite des Flansches 35 abstützt.On the edge 23 and the edge of the intermediate area 24 is a ring around the entire hotplate body or overflow rim 30 made of stainless steel pressed with its inner portion 31, which has the cross section of an inverted V or U and with its top 32 on the bottom of the Flange 35 supports.

Ein schräg nach aussen und unten gerichteter Aussenabschnitt greift normalerweise über einen hochstehenden Rand einer Einbauplatte und stützt sich auf dieser ab. Dadurch ist ein dichter Kochplatteneinbau möglich.An outer section that is inclined outwards and downwards usually reaches over one upstanding edge of a mounting plate and is supported on this. This enables a dense installation of the hotplate.

Im Bereich der unbeheizten Mittelzone 20 jeder Heizzone ist ein Temperaturbegrenzer 33 angeordnet, der die Temperatur der Kochplatte abfühlt und jede der Kochplattenhälften unabhängig voneinander gegen Übertemperatur schützt. Auch die Steuerung bzw. Regelung der Kochplatte erfolgt durch zwei einzeln einstellbare Regel- oder Steuergeräte 34, kann aber auch durch ein gemeinsames Gerät mit wahlweiser Umschaltmöglichkeit erfolgen. Der Heizringbereich 19 jeder Heizzone 17,18 ist von einem auf dem Rand 23 aufliegenden Abschlussdeckel 38 abgedeckt, der an einem Mittelbolzen 36 in der Mittelzone 20 befestigt ist. Jede Heizzone hat eine eigene Anschlussleitung.In the area of the unheated middle zone 20 of each heating zone there is a temperature limiter 33 which senses the temperature of the hotplate and protects each of the hotplate halves independently of one another against excess temperature. The hotplate is also controlled or regulated by two individually adjustable regulating or control devices 34, but can also be done by a common device with an optional switchover option. The heating ring area 19 of each heating zone 17, 18 is covered by an end cover 38 which rests on the edge 23 and is fastened to a central pin 36 in the central zone 20. Each heating zone has its own connection line.

Es hat sich gezeigt, dass die Heizzonen 17, 18 gleichzeitig oder unabhängig voneinander beheizt werden können, ohne dass es zu unzulässigen Verwerfungen oder Beschädigungen des Kochplattenkörpers kommt. Dazu trägt die massive Bauweise des Zwischenbereiches 24 bei. Trotzdem ist der Wirkungsgrad bei der Beheizung nur einer Zone erstaunlich gut.It has been shown that the heating zones 17, 18 can be heated simultaneously or independently of one another without causing undue warping or damage to the hotplate body. The massive construction of the intermediate area 24 contributes to this. Nevertheless, the efficiency of heating only one zone is surprisingly good.

Claims (5)

1. Electric hotplate containing a hotplate body (12) made from cast material and a heating means for the same comprising electrical heating resistors (22) embedded in grooves (21) on the bottom surface of the hotplate body (12), and arranged in two heating zones (17, 18), characterized in that the hotplate body (12), comprising a continuous metal casting and the flat cooking surface (15) formed from it have an elongated shape, that both heating zones (17, 18) are juxtaposed on the hotplate body and between them there is an unheated intermediate area (24) of the hotplate body (12) forming part of the cast hotplate body (12).
2. Electric hotplate according to claim 1, characterized in that the two heating zones (17,18) are mirror-inverted relative to one another, but are otherwise identically constructed and preferably the circular or circular ring-shaped heating zones (17, 18) are in each case surrounded by an all-round, vertical edge (23).
3. Electric hotplate according to claims 1 or 2, characterized in that the intermediate area (24) between the heating zones (17, 18) is made from cast material, which is between 7 and 15 mm thick, preferably approximately 10 mm and in particular the distance between the edges (23) of the heating zones (17, 18) is between 1 and 3 cm.
4. Electric hotplate according to one of the preceding claims, characterized in that, in plan view, the hotplate body (12) is defined by two semicircles and two straight lines connecting the same.
5. Electric hotplate according to one of the preceding claims, characterized in that each heating zone (17,18) has its own control means (34), as well as optionally its own thermal cutout (33).
EP84111456A 1983-10-06 1984-09-26 Electric cooking plate Expired EP0136655B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84111456T ATE35759T1 (en) 1983-10-06 1984-09-26 ELECTRIC HOTPLATE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3336311 1983-10-06
DE3336311A DE3336311A1 (en) 1983-10-06 1983-10-06 ELECTRIC COOKING PLATE

Publications (3)

Publication Number Publication Date
EP0136655A2 EP0136655A2 (en) 1985-04-10
EP0136655A3 EP0136655A3 (en) 1985-07-03
EP0136655B1 true EP0136655B1 (en) 1988-07-13

Family

ID=6211115

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84111456A Expired EP0136655B1 (en) 1983-10-06 1984-09-26 Electric cooking plate

Country Status (6)

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US (1) US4611112A (en)
EP (1) EP0136655B1 (en)
AT (1) ATE35759T1 (en)
DE (2) DE3336311A1 (en)
ES (1) ES290831Y (en)
YU (1) YU45909B (en)

Families Citing this family (9)

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US5162636A (en) * 1990-01-17 1992-11-10 E.G.O. Elektro-Gerate Blanc U. Fischer Electric cooking means
US5397873A (en) * 1993-08-23 1995-03-14 Emerson Electric Co. Electric hot plate with direct contact P.T.C. sensor
GB9511396D0 (en) * 1995-06-06 1995-08-02 British Nuclear Fuels Plc Chemical complexes
GB9515966D0 (en) * 1995-08-03 1995-10-04 British Nuclear Fuels Plc Nuclear fuel pellets
US5855163A (en) * 1996-12-10 1999-01-05 Demars; Robert A. Coffee brewer
WO2006108142A2 (en) * 2005-04-06 2006-10-12 Conair Corporation Dual coffee maker
US9320293B2 (en) * 2008-06-06 2016-04-26 Gold Medal Products Company Popcorn kettle
US10136664B2 (en) 2016-07-11 2018-11-27 Gold Medal Products Company Popcorn popping machines and methods for different types of popcorn kernels and different popped popcorn types
DE102017211100A1 (en) 2017-06-29 2019-01-03 E.G.O. Elektro-Gerätebau GmbH hotplate

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Also Published As

Publication number Publication date
DE3472746D1 (en) 1988-08-18
DE3336311A1 (en) 1985-04-18
YU170484A (en) 1988-02-29
EP0136655A3 (en) 1985-07-03
ES290831Y (en) 1986-12-16
ES290831U (en) 1986-04-16
YU45909B (en) 1992-09-07
ATE35759T1 (en) 1988-07-15
EP0136655A2 (en) 1985-04-10
US4611112A (en) 1986-09-09

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