EP3598848B1 - Cooking hob and heating device for a cooking hob - Google Patents

Description

Field of application and state of the art

The invention relates to a heating device for a hob and a hob with a plurality of such heating devices.

Radiant heating devices are a well-known and well-proven technology for the heating devices in cooktops. Such heating devices are, for example, from DE 3613902 A1 known in detail. There several identical heating devices, each with a rectangular carrier, are provided on a hob, on which heating elements are arranged, advantageously two heating elements, each with a heating conductor. The heating conductors run in an interlocking angular-spiral shape within a jointly formed heating surface which is delimited by a circumferential, upwardly extending outer edge of the carrier. Several of these heating devices, for example four heating devices, can be arranged relatively close to one another in the hob in order to achieve the most complete heating possible or to utilize the surface of the hob as well as possible.

From the DE 34 07 965 A1 a grill plate is known which is divided into a plurality of individual fields of equal size. Each individual field has a tubular heating element in a spiral shape attached to the underside.

From the DE 40 07 680 A1 a hob is known with a hob plate which is divided into several rectangular areas. Each of these areas has its own heating element.

From the US 2005/0051533 A1 a stove is known with a hob on the top, which has a plurality of heating devices under a hob plate. The heating elements are each rectangular and flat. They are electrically contacted from below to a power supply.

From the U.S. 4,073,970 A a flat heating unit is known which has two heating elements which are intertwined in a meandering manner. The heating elements are designed as strip-shaped heating resistors and can for example consist of a metal alloy with a high proportion of platinum.

Task and solution

The invention is based on the object of creating a heating device mentioned at the beginning and a hob provided with such heating devices, with which problems of the prior art can be solved and in particular it is possible to implement advantageous types of heating with differently sized cooking vessels on the hob.

This object is achieved by a heating device with the features of claim 1 and a hob with the features of claim 10. Advantageous and preferred embodiments of the invention are the subject matter of the further claims and are explained in more detail below. Some of the features are only explained for the heating device or only for the hob. However, they should be able to apply independently to both the heating device and the hob independently and independently of one another. The wording of the claims is made part of the content of the description by express reference.

It is provided that the heating device has a flat carrier with an outer edge. This flat carrier can advantageously be flat, but does not have to be. The outer edge can also be raised, but this is not mandatory either. In any case, the outer edge limits the carrier to the outside. The carrier has a substantially rectangular shape Shape, especially with slightly rounded or beveled corners. Opposing sides parallel to one another are advantageous in each case. Furthermore, the heating device has two heating elements, advantageously arranged or fastened on the carrier. The heating elements each have at least one heating conductor and together form a heating surface which advantageously corresponds approximately to the surface of the carrier. A heating element could also have two heating conductors. Heating elements or heating conductors advantageously generate radiant heat upwards during operation.

A heating conductor is advantageously defined in that it has two ends and can each be electrically connected or contacted for its operation. Furthermore, it is provided that the heating elements and / or the partial heating surfaces can be or can be operated independently of one another. For this purpose, they can each have their own electrical connections or can be electrically contacted separately from one another. Some connections of several heating elements or partial heating surfaces can also be provided jointly, as is known per se for such heating devices and in particular radiant heating devices.

The heating conductors are attached to the carrier, possibly with partial embedding in an upper side of the carrier. Each heating element defines a partial heating surface, advantageously exactly a single partial heating surface. In this case, the heating device has at least two partial heating surfaces, advantageously exactly two partial heating surfaces. These partial heating surfaces lie within the rectangular shape of the carrier, specifically within the outer edge.

According to the invention, it is provided that the partial heating surfaces of a heating device do not overlap, that is to say that they run separately from one another. It can be provided that a partial area is wherever a heating conductor of the associated heating element runs, that is, it is defined in terms of area by it. It is thus advantageously also provided that no heating conductors overlap or cross one another. Furthermore, a first partial heating surface is rectangular. At least one of its outer sides extends to the outer edge of the carrier or to an inner side of this outer edge when it is pulled upward, as has been described above. This at least one outer side of the partial heating surface also runs parallel to this outer edge, to which it extends directly or close to it.

Furthermore, according to the invention, the heating device has a second partial heating surface corresponding to a second heating element. This second partial heating surface covers the rest of the support that is left free from the first partial heating surface. It can be provided that the second partial heating surface of more than a single heating element or of more than one single heating conductor is formed, so that it can also be viewed as the sum of several further sub-heating surfaces or is formed by several further sub-heating surfaces. In any case, it is important within the scope of the invention that the first partial heating surface is rectangular. The area of the carrier that is still exposed by the first partial heating surface is also covered by at least one heating element or at least one heating conductor and thus also heats.

It is thus possible with the invention to create a heating device with a carrier which has at least one separately operable rectangular partial heating surface which is located on the edge of the carrier. It can therefore be operated very well together with further partial heating surfaces of a further heating device, which is arranged close to it, as a so-called bridge or bridged heating device for heating matching cooking vessels, for example elongated-oval roasters.

Advantageously, the heating elements or the heating conductors are resistance heating elements and are designed to glow or even to light up somewhat during operation. They heat cooking vessels placed above them by means of their radiant heating power. This is also from the aforementioned DE 3613902 A1 known.

In an embodiment of the invention it can be provided that the first partial heating surface with two of its outer sides, which advantageously abut one another or form a corner with one another, each extend to the outer edge or to an inner side of the outer edge of the carrier. They also run parallel to it. The first partial heating surface can thus preferably lie, so to speak, in a corner or in a corner region of the carrier. Then it can not only be operated together with a single further partial heating surface of an adjacent heating device as the aforementioned bridge or bridged heating device, but also or alternatively with yet another partial heating surface of yet another heating device. In particular, it can be provided in the case of a hob according to the invention that not only at least two heating devices according to the invention are arranged next to one another in such a way that they have a small spacing. This can in particular be a distance of less than 2 cm, so that the respective first partial heating surfaces of the two heating devices lie with their outer sides adjacent and parallel to one another. It is even possible for four such heating devices to be arranged in a square, and in the center, where four corners meet, four partial heating surfaces can also meet. Their corners then each have only a small distance from one another, advantageously less than 2 cm to 4 cm. Here, these four partial heating surfaces or two adjacent partial heating surfaces can be operated together, depending on the size of a cooking vessel to be heated.

In the case of such a hob, it is in particular also possible for the respective first partial heating surfaces of the heating devices that are adjacent and parallel to one another to lie congruently or parallel to one another over the same length. In this way they create a common heating surface, which in turn is rectangular.

In an advantageous embodiment of the invention, the first partial heating surface has a square shape. In general, an outer side of the first partial heating surface can have a length between 100 mm and 200 mm, preferably between 110 mm and 150 mm. This results in a customary dimension for common cooking vessel sizes, especially when two of them are used to heat an elongated oval roaster mentioned at the beginning. Frequently used cooking vessels with a diameter of 150 mm have an inner square with an edge length of almost 110 mm. The aforementioned roasters often have a length between 250 mm and 400 mm along their larger longitudinal extent. Here, too, an aforementioned square shape in the size mentioned fits well.

The second partial heating surface preferably has an L-shape, so that the first partial heating surface is located in the interior angle formed thereby. In a particularly advantageous manner, the first partial heating surface and the second partial heating surface together form a rectangular or square surface, specifically covering the flat carrier up to its outer edge or up to its inner side. As explained at the outset, the second partial heating surface can in turn also be formed by a plurality of separately operable heating elements or heating conductors. The second partial heating surface can preferably have legs of approximately the same width, which, however, can be of different lengths. The difference in length can be a factor of 1.2 to 2.5, advantageously 1.5 to 2.

In such a configuration of a heating device, a small rectangular area corresponding to the first partial heating area can be heated separately, usually for a relatively small cooking vessel. Operating the second part of the heating surface alone will generally not make sense, since no correspondingly shaped cooking vessels are common. A possible next larger area to be heated for a cooking vessel is advantageously the joint operation of the first partial heating surface and the second partial heating surface, and thus the entire heating device. This can be suitable for medium-sized cooking vessels.

For elongated roasters, two adjacent first partial heating surfaces can be heated as explained above. For very large cooking vessels or very large roasting pans, two adjacent heating devices can be fully operated, that is, their first and second partial heating surfaces. Thus, there is a great variety of possibilities in a hob according to the invention to put together heated surfaces, whereby it can be achieved that differently sized or differently shaped cooking vessels are heated as well, efficiently and quickly as possible.

For the carrier itself it is advantageously provided that it even has a specially square shape. In this case, the first partial heating surface is also almost square or has a difference in its side lengths of a maximum of 10%. For a hob according to the invention, it can be provided in a further embodiment of the invention that at least one heating device according to the invention is square and at least one heating device according to the invention is rectangular. In some cases, they can be arranged close to one another or next to one another in order to enable, in combination, heating of surfaces that are as different or variable as possible.

In an embodiment of the invention, an elongated temperature sensor or temperature limiter can be provided on the heating device, which extends above the heating elements or the heating conductors. Such a temperature sensor or temperature limiter runs at least over the first partial heating surface, possibly also over the second partial heating surface. Since with such a heating device, as explained at the beginning, the first partial heating surface is preferably always operated, if the heating device is operated at all, it is protected with regard to a possibly dangerous excessively high temperature. If the temperature sensor or temperature limiter also extends in an elongated form over the second partial heating surface, this can also be secured, so to speak. Here the temperature sensor or temperature limiter can be compensated, as shown in the DE 3705260 A1 and above all the DE 102004058473 A1 is known through the use of different materials. In principle, such elongated temperature sensors or temperature limiters are known from the prior art; they are also referred to as safety temperature limiters or rod regulators. For this, reference is also made to the aforementioned DE 3613902 A1 referenced, which also shows this. Such an elongated temperature sensor or temperature limiter is advantageously a thermomechanical component and works with thermal expansion, whereby a switch is opened or closed at a certain expansion path corresponding to a certain temperature. A power supply for the heating device or one of the heating elements or the heating conductor is advantageously automatically disconnected if the temperature detected is too high.

It can advantageously be provided that the elongated temperature sensor or temperature limiter extends from an outer edge of the carrier over at least half the extent of the carrier in the direction of the longitudinal direction of the temperature sensor or temperature limiter itself over at least the first partial heating surface. In other words, the elongated one covers it Temperature sensor or temperature limiter at least half the area of the first partial heating surface. It can particularly advantageously be provided that the elongated temperature sensor or temperature limiter completely covers the first partial heating surface. In yet another further embodiment of the invention, it can be provided that the temperature sensor or temperature limiter runs from one outer edge of the carrier to the opposite outer edge of the carrier, that is to say spans the entire carrier or its surface, so to speak. In this case, too, it should in any case run above the first partial heating surface so that it is protected against excessively high temperatures.

As an alternative to the aforementioned elongated temperature sensor or temperature limiter, a small or point-shaped temperature sensor can be provided on the heating device, which is also arranged above or above at least the first partial heating surface. Such a small or punctiform temperature sensor can be pressed against the underside of a hob plate of the hob and detect the temperature here directly, since such stick regulators or safety temperature limiters are usually supposed to monitor and limit a maximum temperature of the hob plate. Such a small temperature sensor can be formed by a PTC resistor, an NTC resistor or a thermocouple, thus enabling a direct temperature measurement. Such small or punctiform temperature sensors are evaluated electrically or electronically to determine a temperature signal, on the basis of which a possibly excessively high temperature can be determined.

In a possible embodiment of the invention, combinations of the aforementioned elongated temperature sensors and small or point-shaped temperature sensors, in particular with a PTC resistor, NTC resistor or thermocouple, can also be formed. For this purpose, either arbitrary placements can be provided; alternatively, the small or point-shaped temperature sensors can be arranged on an elongated temperature sensor, for example clipped on.

In an embodiment of the invention, it is possible that a further such small or point-shaped temperature sensor is arranged in the area of the second partial heating surface. It can also be arranged above it or in the same way as the other temperature sensor in the area of the first partial heating surface.

In a further advantageous embodiment of the invention, electrical connections to a heating device are provided only on one side of the carrier, specifically for all partial heating surfaces. An aforementioned temperature sensor or temperature limiter can also be electrically contacted on this side. It can advantageously be provided that the electrical connections of the first partial heating surface are spatially somewhat separated or are at a distance from the electrical connections of a second partial heating surface. Different so-called connection blocks or connection plug-in devices can also be provided in each case. This facilitates the electrical connection when installing the heating device or the hob. Furthermore, the other sides of the heating device can then remain free of electrical connections that inevitably protrude beyond the outside or the outer edge. This results in the possibility that the heating devices can be arranged very close to one another on at least one, advantageously on two or even on three sides, and possibly even touch one another in order to achieve small intermediate gaps.

Electrical connections can advantageously be designed in a known manner with plug connections, advantageously plug connection lugs, which protrude outwards from the heating device. Connection sections of the plug connection lugs can extend inward so that ends of the heating conductors can be welded to them.

In a hob, heating devices can under certain circumstances even be arranged so close to one another that their outer edges touch one another. Particularly when partial heating surfaces of two adjacent heating devices are operated jointly in the aforementioned bridge operation, it is advantageous if a non-heated area in between is as narrow as possible. In this area, a raised outer edge of the carrier can possibly even be thinner than in other areas in which no further heating device is provided directly next to it or even touches it. Then the thicknesses of two such thin outer edges touching each other add up, which in turn makes it possible to create a sufficiently thick outer edge overall. Furthermore, the lateral transfer of heat does not interfere so much here, since the adjacent heating device heated in this way is itself very temperature-resistant.

In yet another embodiment of the invention, it can be provided that there are two types of heating devices which are designed to be mirror-symmetrical to one another. They can then be arranged next to one another in a hob according to the invention. A center line running centrally between the two heating devices forms an axis of mirror symmetry for the two heating devices. In this case, in each heating device, the first partial heating surface is arranged towards the adjacent heating device or its first partial heating surface, so that these two lie next to one another and can have a bridging function.

In a further embodiment of a hob, the rectangular heating devices according to the invention can also be combined with further heating devices that are round or oval are trained. For example, a left or a front area of the hob can be covered with rectangular heating devices on the one hand or round or oval heating devices on the other hand, and the other area in each case with the differently shaped type of heating devices.

In yet another embodiment of the invention, it can be provided that exactly two heating devices of the same size are arranged next to one another in a rear area of the hob. Both of these are advantageously rectangular, preferably non-square. A distance between them can particularly advantageously be a maximum of 10 cm, advantageously between 2 cm and 5 cm. In a front area of the hob, exactly two heating devices of the same size are also arranged next to one another, preferably square. On at least the left or the right side of the hob, the two heating devices are each with the outer sides of their first partial heating surfaces adjacent and parallel to one another, so that they can be bridged well. The outer sides of their first partial heating surfaces are in each case congruent or are in each case parallel to one another over the same length. A bridging function from front to back can then be provided.

In yet another embodiment of the aforementioned design of a hob, heating devices with the same shape can be provided, in particular exclusively heating devices with a square shape. Two heating devices lying one behind the other run parallel to one another with their outer edges facing one another, advantageously with a very small spacing as explained above. However, they are not completely congruent, but somewhat offset to one another laterally, for example by 2 cm to 5 cm. In each of the corner areas on the overlapping section, first partial heating surfaces are provided, advantageously in a square shape, specifically in such a way that they are next to one another and congruent with one another. In this way, they can be easily bridged with one another in joint operation. Particularly large roasters can then be heated using the two fully operated heating devices in bridge mode.

In principle, in the case of a hob according to the invention, heating surfaces or partial heating surfaces of different heating devices, which have fundamentally different shapes, can also be bridged. However, only rectangular partial heating surfaces are advantageously operated jointly as a bridge function, even if round or oval heating devices are also provided in the hob.

Brief description of the drawings

Fig. 1

eine Draufsicht auf eine erste Ausgestaltung einer erfindungsgemäßen Heizeinrichtung mit zwei Heizelementen, die jeweils eine Teil-Heizfläche definieren, wobei die Heizeinrichtung quadratische Außenform aufweist,

Fig. 2

eine funktional schematisierte Darstellung der Heizeinrichtung aus Fig. 1 mit einer quadratischen ersten Teil-Heizfläche und einer L-förmigen zweiten Teil-Heizfläche,

Fig. 3

eine Draufsicht auf eine weitere erfindungsgemäße Heizeinrichtung aufbauend auf derjenigen entsprechend Fig. 1 mit rechteckiger Außenform,

Fig. 4

eine funktional schematisierte Darstellung der Heizeinrichtung aus Fig. 3 mit einer quadratischen ersten Teil-Heizfläche und einer L-förmigen zweiten Teil-Heizfläche,

Fig. 5

eine Anordnung von zwei Heizeinrichtungen ähnlich Fig. 1 bzw. 2 direkt nebeneinander, die beispielsweise in einem Kochfeld vorhanden sein könnte, wobei die beiden ersten Teil-Heizflächen mit einer Außenseite deckungsgleich nebeneinander liegen,

Fig. 6

eine Abwandlung der Anordnung aus Fig. 5 mit Verwendung von Heizeinrichtungen ähnlich Fig. 3 bzw. 4,

Fig. 7

ein erfindungsgemäßes Kochfeld mit vier Heizeinrichtungen und einer Bedieneinrichtung, wobei links und rechts jeweils genau eine Heizeinrichtung ähnlich Fig. 1 und eine Heizeinrichtung gemäß Fig. 3 vorgesehen ist,

Fig. 8

ein weiteres erfindungsgemäßes Kochfeld mit vier quadratischen Heizeinrichtungen und einer Bedieneinrichtung, wobei vier Heizeinrichtungen entsprechend Fig. 1 vorgesehen sind und zueinander jeweils versetzt sind,

Fig. 9

ein weiteres erfindungsgemäßes Kochfeld mit vier Heizeinrichtungen und einer Bedieneinrichtung, wobei links eine Anordnung von Heizeinrichtungen entsprechend Fig. 4 vorgesehen ist und rechts zwei unterschiedlich große runde Heizeinrichtungen vorgesehen sind und

Fig. 10

ein weiteres erfindungsgemäßes Kochfeld mit vier Heizeinrichtungen und einer Bedieneinrichtung, wobei vier Heizeinrichtungen mit gleicher Außenform nahe beieinander oder angrenzend aneinander vorgesehen sind, deren jeweilige erste Teil-Heizflächen eine geschlossene rechteckige Fläche bilden.

Embodiments of the invention are shown schematically in the drawings and are explained in more detail below. In the drawings show:

Fig. 1

a plan view of a first embodiment of a heating device according to the invention with two heating elements, each defining a partial heating surface, wherein the heating device has a square outer shape,

Fig. 2

a functionally schematic representation of the heating device Fig. 1 with a square first part heating surface and an L-shaped second part heating surface,

Fig. 3

a plan view of a further heating device according to the invention building on the corresponding one Fig. 1 with a rectangular outer shape,

Fig. 4

a functionally schematic representation of the heating device Fig. 3 with a square first part heating surface and an L-shaped second part heating surface,

Fig. 5

an arrangement of two heaters is similar Fig. 1 or 2 directly next to each other, which could be present in a hob, for example, with the first two partial heating surfaces lying next to each other with one outside congruent,

Fig. 6

a modification of the arrangement Fig. 5 with the use of heating devices similar Fig. 3 or 4,

Fig. 7

a hob according to the invention with four heating devices and an operating device, with exactly one heating device similar to the left and right Fig. 1 and a heating device according to Fig. 3 is provided,

Fig. 8

Another hob according to the invention with four square heating devices and an operating device, with four heating devices correspondingly Fig. 1 are provided and are offset from one another,

Fig. 9

Another hob according to the invention with four heating devices and an operating device, with an arrangement of heating devices correspondingly on the left Fig. 4 is provided and two different sized round heating devices are provided on the right and

Fig. 10

Another inventive hob with four heating devices and an operating device, with four heating devices with the same external shape close to each other or are provided adjacent to one another, the respective first partial heating surfaces of which form a closed rectangular surface.

Detailed description of the exemplary embodiments

In the Fig. 1 a heating device 11a designed as a radiant heating device according to a first embodiment of the invention is shown in plan view. The heating device 11a is, as is customary for radiant heating devices, arranged in a sheet metal shell 12a, which here has a square outer shape. The heating device 11a also has a carrier 13a which is arranged in the sheet metal shell 12a and which consists of suitable thermally insulating and electrically insulating material. A wide outer edge runs around the carrier 13a and protrudes upwards and can be a separate part or be integrally formed on during manufacture. It consists of a similar material as the carrier 13a. The outer edge 15a has rounded corners for manufacturing reasons. Except for these rounded corners, the outer edge 15a, like the carrier 13a, is rectangular or here even square. Furthermore, the outer edge 15a has an inner side 16a which, so to speak, delimits the upper side of the carrier 13a. The outer edge 15a likewise has an outer side 17a with which it largely rests against a raised edge of the sheet metal shell 12a.

A first heating element 19a is provided on the carrier 13a and consists of a first heating conductor 20a, namely a single heating conductor 20a. This elongated heating conductor 20a is laid in two parallel tracks in a meandering shape and has two first connections 21a, which protrude through the outer edge 15a for the electrical connection. In the Fig. 2 it can be seen that the first heating element 19a with the first heating conductor 20a forms a first partial heating surface 1THa which is not only rectangular, but which can be viewed as square. The first heating conductor 20a runs around an elevation 14a of the carrier 13a, so that no heating conductor and therefore no heating is provided in the area of this elevation 14a. Nevertheless, the mentioned first partial heating surface 1THa can be viewed as being square in accordance with the outer borders. This also applies to the corners according to Fig. 2 , especially the upper right and lower right corners.

The heating device 11a also has a second heating element 22a which, so to speak, covers the remaining surface of the carrier 13a. For this purpose, a second heating conductor 23a is laid in a meandering shape with a different width on the carrier 13a; it forms the second partial heating surface 2THa. The second heating conductor 23a of the second heating element 22a is led to second connections 24a, which in turn protrude outward through the outer edge 15a. The second part heating surface is like that Fig. 2 shows, L-shaped or angled with the same simplifications as previously carried out for the first partial heating surface 1THa. Since the carrier 13a is square, and the first partial heating surface 1THa is also square and is positioned in the upper right corner of the carrier 13a, the second heating element 22a or the corresponding second partial heating surface 2THa has an L-shape with two equal long and equally wide thighs.

The two partial heating surfaces 1THa and 2THa jointly form a heating surface Ha of the heating device 11a, so a square surface can be heated overall. From the laying pattern of the Fig. 1 for the two heating conductors 20a and 23a it can be seen that they do not cross each other, which is relatively natural. Furthermore, the respective partial heating surfaces which are formed by each of the heating conductors 20a and 23a do not cross or overlap either.

A rod regulator 27a, which is designed as known in the prior art, is attached to the heating device 11a on the right. The rod controller 27a has a rod controller housing 28a, from which an elongated thermomechanical temperature sensor 29a projects into the heating device 11a or extends above the heating surface Ha. The temperature sensor 29a extends as far as the elevation 14a of the carrier 13a and is held by this against being pressed downwards. It can thus be seen that in the Fig. 1 the rod regulator 27a only thermally monitors the first partial heating surface 1THa and switches it off when the temperature is too high, as is known per se from the prior art and does not need to be explained in more detail. For the Fig. 2 is shown how the temperature sensor 29a could be extended with an extension 29a 'shown in dashed lines, which then also covers part of the second partial heating surface 2THa. The second heating element 22a can thus also be monitored thermally, but this does not have to be the case. Here the rod controller can be compensated as a temperature sensor, as shown in the above DE 3705260 A1 and DE 102004058473 A1 is known.

The first connections of the first heating element 19a or of the first heating conductor 20a are routed to the rod controller housing 29 or are electrically connected. The second connections 24a of the second heating conductor 23a are held in a so-called connection block, advantageously made of ceramic material. So they can easily be electrically contacted from the side with a plug. The first connection of the connection block is connected to the contact of the stick regulator 27a via a stranded wire, not shown, so that when the stick regulator 27a is switched both heating elements are switched off, even if only the first heating element is monitored.

In the Fig. 3 a further heating device 11b according to the invention is shown as a modification, the heating device 11b having a rectangular outer shape. In a tin bowl 12b with a rectangular outer shape, a correspondingly matching carrier 13b is inserted with a raised outer edge 15b, which has an inner side 16b and an outer side 17b. An elevation 14b is also provided on the carrier 13b. From a comparison of the Fig. 1 and 3 it can be seen that the heating device 11b of the Fig. 3 on the heating device 11a, so to speak Fig. 1 based, with something added to the left, so to speak.

The heating device 11b has a first heating element 19b which is formed by a first heating conductor 20b which has first connections 21b. This first heating element 19b corresponds exactly to the first heating element 19a from FIG Fig. 1 . A first partial heating surface 1THb formed therefrom is like that Fig. 4 underneath shows, square and sits, so to speak, in the upper right corner of the entire heating surface Hb of the heating device 11b.

A second heating element 22b fills the remaining heating surface Hb except for the elevation 14b and, together with a second heating conductor 23b, forms the second partial heating surface 2THb, as is also the case in FIG Fig. 4 can be seen. Also from the comparison of the Fig. 2 and 4th It can be clearly seen that in the second heating device 11b, in particular in the second partial heating surface 2THb, something is added to the left, namely to the extent that the second heating device 11b is longer in the direction from left to right than the first heating direction 11a. The second heating conductor 23b can be electrically connected to the outside with second electrical connections 24b through the outer edge 15b.

A rod regulator 27b is also provided in the heating device 11b, which has a rod regulator housing 28b with an elongated temperature sensor 29b. In the Fig. 4 it is shown that the elongated temperature sensor 29b, shown in dashed lines to the left, with an extension 29b 'could extend over the entire heating surface Hb and thus also fully over this area of the second partial heating surface 2THb, which is slightly wider here than in the Fig. 1 .

From the Fig. 2 and 4th it can be seen that the respective first partial heating surface 1TH could also be arranged at any other point on the carrier 13 or within the heating surface H thereof. In this case, however, the electrical supply lines would possibly be more difficult to lay, although this is feasible, as will be explained below.

In the Fig. 5 FIG. 11 is an arrangement 31a of two heating devices 11a according to or similar to the illustration of FIG Fig. 2 shown. However, only the left heating device 11a can be seen exactly as in FIG Fig. 1 or. Fig. 2 formed, the right heating device 11a 'is only formed in principle the same, that is, with the same size partial heating surfaces. Strictly speaking, it is mirror-symmetrical to the left heating device 11a formed with a mirror axis along a center line 32a which runs between the two heating devices 11a and 11a '.

The two first partial heating surfaces 1THa and 1THa 'adjoin one another with their sides facing one another. In this regard, they are congruent because they are also of the same size. It can thus be seen from this that in the case of the arrangement 31a several cooking vessels of different sizes can be heated or heating zones can be formed. The smallest cooking vessel can only be heated by one of the first two partial heating surfaces 1THa or 1THa '. A next larger one can be heated by an entire heating device 11a or 11a, for example 1THa and 2THa. A smaller, elongated or oval roasting pan can be heated by the first two partial heating surfaces 1THa and 1THa 'in common operation. An even larger elongated roaster or a very large saucepan could be heated jointly by the two heating devices 11a and 11a '. From the shape of the second partial heating surfaces 2THa or 2THa 'it can be seen at first glance that their sole isolated operation makes no sense.

In the Fig. 6 a further arrangement 31b is shown, which is basically constructed similarly to that of FIG Fig. 5 . On the left is a heating device 11b according to FIG Figures 3 and 4 intended. To the right, directly next to it and only separated by a center line 32b, a further heating device 11b 'is provided, which has the same external shape and size. She is, similar to before too Fig. 5 described, formed mirror-symmetrically to the left heating device 11b, whereby it is possible that the two first partial heating surfaces 1THb and 1THb 'are mirror-symmetrical and almost abut one another with their outer sides facing one another.

In the representations of the Fig. 5 ff. the thickness of the respective outer edge 15 is not taken into account when it is shown how partial heating surfaces or entire heating surfaces can rest against one another or can continue. The principle on which the invention is based is nevertheless easy to understand and understand.

In the arrangement 31b according to Fig. 6 can be heated with the respective first partial heating surfaces 1THb and 1THb 'as before for Fig. 5 described. Due to the now somewhat larger second partial heating surfaces 2THb, an improved adaptation to cooking vessels of different sizes can possibly be achieved.

In the Fig. 7 is a plan view of an inventive hob 35 in a first embodiment of the invention. The hob 35 has four heating devices 11, namely two heating devices 11a or 11a 'with a square outer shape and two heating devices 11b or 11b 'with a rectangular outer shape. In the case of a hob, however, even more appropriately designed heating devices could be provided, for example six or eight heating devices. An operating device 36 is arranged in the front center, advantageously with touch switches.

In the hob 35, a heating device 11a or 11a 'with a square outer shape and a heating device 11b or 11b' with a rectangular outer shape are combined and installed close to one another on the left and right. They can even touch. It can be seen how the heating device 11a 'according to FIG Fig. 5 the first partial heating surface 1THa 'is placed in the upper left corner. To the right and below is the second partial heating surface 2THa '.

In the other upper heater 11b according to FIGS Figures 3 and 4 the first partial heating surface 1THb is arranged in the lower left corner, and to the right and above the L-shaped second partial heating surface 2THb extends. Thus, with the first two partial heating surfaces 1THa 'and 1THb, a continuous bridge for heating an elongated cooking vessel can be operated again.

In the case of the right-hand arrangement of the heating devices 11a 'and 11b, the offset is selected differently than on the left, as an example of as many different possibilities for arrangement as possible. The two heating devices are still in direct contact with one another, including the respective first partial heating surfaces 1THa 'and 1THb. However, the adjacent outer sides are no longer congruent, but rather offset from one another. Thus, they can each still be arranged in the corners of the respective heating device, but the same heating devices 11 can be used on the left and right in the hob 35. The offset of the first two partial heating surfaces can be a bit surprising in practice, but is only insignificant thermally.

Another hob 135 according to the invention according to FIG Fig. 8 has two heating devices 11a on the left Figs. 1 and 2 that lie against each other, but are not congruent, but are slightly offset. Their outer shape is each square. The respective first partial heating surfaces 1THa, however, lie congruently against one another.

On the right, two further square heating devices 11a ″ are arranged on one another, but offset from one another. There, a respective first partial heating surface 1THa ″ is indeed formed on an outer side or adjoining the outer edge, but only on an outer side. It is not arranged in the corner, so to speak. This makes it possible for the two heating devices 11a "are arranged offset to one another and the first partial heating surfaces 1THa" do not sit in the corner, but they are nevertheless arranged congruently next to one another.

From a comparison of the Figures 7 and 8 together it can be seen that the hob 35 of Fig. 7 the use of space in the hob behind the front central control unit is slightly better.

In the Fig. 9 A further hob 235 according to the invention is shown, in which an arrangement 31a correspondingly behind a front, central control device 236 on the left Fig. 5 a heater 11a and a heater 11a is provided. In the right half of the hob 235 there are two round heating devices, namely a small round heating device 35c in the front and a larger round heating device 35d in the rear. These do not have any subdivision into different partial heating surfaces. Due to their respective size, they are well adapted to the space available, also because of the operating device 236.

In the still further hob 335 according to the invention according to FIG Fig. 10 Finally, in a heating area behind a narrow, long operating device 336, four heating devices 111a and 111a 'are to be arranged very close to one another or butting together. In these heating devices 111a and 111a ', which each have a square outer shape, it is provided as a special feature that their first partial heating surfaces 1THa and 1THa' abut one another in the middle or in the common central area and form an essentially closed or continuous surface . They are all the same size. The diagonally opposite heating devices 111a and 111a 'are each identical, the others are mirror-symmetrical to them. The very large area formed by the four partial heating surfaces 1THa and 1THa 'involved can be used to heat very large cooking vessels such as paella pans. It is also conceivable to operate the entire four heating devices 111a and 111a 'with all partial heating surfaces 1THa, 1THa', 2THa and 2THa 'for such paella pans or the like.

The respectively associated second partial heating surfaces 2THa and 2THa 'are then grouped as a whole as a kind of rectangular ring around them on the outside. Here, too, different bridge functions or bridge arrangements and thus overall interconnections of heating surfaces or partial heating surfaces are possible in order to be able to optimally heat differently sized cooking vessels. An internal electrical connection to the first partial heating surfaces 1THa and 1THa 'is technically somewhat more difficult or more complex, since they do not adjoin an exposed outside of the heating device. This can also be done by laying the heat conductor accordingly. The heating devices 111a and 111a 'so far from each other to remove so that an electrical connection is created in an intermediate space is possible. Such a large distance, however, harbors problems that are not desired for other reasons, and foreseeably worsens the bridge function due to excessively large spaces. This leaves the possibility of an electrical supply to a partial heating surface from below, or with non-glowing electrical supply over the respective second partial heating surface 2THa and 2THa '. These can, for example, be significantly thicker and therefore not be heated with the same current. Alternatively, the heating conductors can be pulled straight at these points so that they are not wavy. In this way, they glow almost invisibly. A complex connection from below is therefore not necessary. These no longer glowing heating conductors as connections for a partial heating surface can then be guided past the heating conductors of the other partial heating surface generally narrowly on the side and thus not or almost not impair this surface.

Claims (15)

1. Heating device (11, 111) for a cooking hob (35, 135, 235, 335), wherein said heating device has:

   - a flat carrier (13) with an outer edge (15),

   - said carrier (13) has a substantially rectangular shape,

   - two heating elements (19, 22) which each have at least one heating conductor (20, 23) and which together form a heating area (Ha, Hb),
   wherein

   - said heating conductors (20, 23) are fastened on said carrier (13),

   - each said heating element (19, 22) defines a partial heating area (1TH, 2TH),

   - said heating elements (19, 22) and/or said partial heating areas (1TH, 2TH) can be operated independently of one another and/or have respectively dedicated electrical connections,

   - the partial heating areas (1TH, 2TH) are situated inside the rectangular shape of the carrier (13), wherein

   - said partial heating areas (1TH, 2TH) of said heating elements (19, 22) do not intersect,

   - a first partial heating area (1THa, 1THb) is rectangular and extends, by way of at least one of its outer sides, to an outer edge (15) or to an inner side (16) of said outer edge (15) of said carrier (13) and runs parallel in relation to said outer edge (15), characterized in that

   - a second partial heating area (2THa, 2THb) covers a rest of said carrier (13) which is left free by said first partial heating area (1THa, 1THb).
2. Heating device according to claim 1, characterized in that said first partial heating area (1THa, 1THb) extends, by way of two of its outer sides, in each case to said outer edge (15) or to an inner side (16) of said outer edge (15) of said carrier (13) and runs parallel in relation thereto, wherein in particular the first partial heating area (1THa, 1THb) is situated in a corner of said carrier (13).
3. Heating device according to claim 1 or 2, characterized in that said first partial heating area (1THa, 1THb) has a square shape, wherein in particular an outer side has a length between 110 mm and 150 mm.
4. Heating device according to any of the preceding claims, characterized in that said second partial heating area (2THa, 2THb) has an L shape, preferably with limbs having approximately equal width, in particular having limbs of different lengths.
5. Heating device according to any of the preceding claims, characterized in that said carrier (13) has a square shape.
6. Heating device according to any of the preceding claims, characterized in that said first partial heating area (1THa, 1THb) is square.
7. Heating device according to any of the preceding claims, characterized in that an elongate temperature sensor (29) or temperature limiter runs above said heating elements (19, 22) over at least said first partial heating area (1THa, 1THb), preferably also partially over said second partial heating area (2THa, 2THb).
8. Heating device according to claim 7, characterized in that said elongate temperature sensor (29) or temperature limiter runs from an outer edge (15) of said carrier (13) over at least half an extent of said carrier in the direction of said temperature sensor (29) or said temperature limiter over at least said first partial heating area (1THa, 1THb), preferably up to the opposite outer edge (15) of said carrier (13).
9. Heating device according to any of claims 1 to 6, characterized in that a small or point-type temperature sensor is arranged over at least said first partial heating area (1THa, 1THb), wherein preferably a further point-type temperature sensor is arranged over said second partial heating area (2THa, 2THb).
10. Cooking hob (35, 135, 235, 335) having a plurality of heating devices (11, 111) according to any of the preceding claims, wherein two heating devices (11, 111) are arranged next to one another in such a way that respectively the first partial heating areas (1THa, 1THb) of said two heating devices, by way of their outer sides, are situated adjacent and parallel in relation to one another.
11. Cooking hob according to claim 10, characterized in that said at least two heating devices (11, 111) are arranged next to one another at a short distance, preferably less than 2 cm, wherein in particular respectively the first partial heating areas (1THa, 1THb) of said two heating devices (11, 111), by way of their outer sides, are situated congruently or parallel next to one another over a same length in each case.
12. Cooking hob according to claim 10 or 11, characterized in that said two heating devices (11, 111) which are arranged next to one another are in contact by way of their outer edges (15).
13. Cooking hob according to any of claims 10 to 12, characterized in that said two heating devices (11, 111) which are arranged next to one another are formed with mirror-image symmetry, wherein a centre line (32) which runs centrally between said two heating devices forms an axis of mirror-image symmetry.
14. Cooking hob according to any of claims 10 to 13, characterized in that further heating devices (35c, 35d) are provided which are of round or oval design.
15. Cooking hob according to any of claims 10 to 14, characterized in that precisely two rectangular heating devices (11, 111) of identical size are arranged next to one another in a rear region of said cooking hob (35, 135, 335), preferably at a distance between 2 cm and 10 cm to each other, wherein precisely two rectangular heating devices (11, 111) of identical size are arranged next to one another in a front region of said hob, wherein said two heating devices, by way of in each case said outer sides of their first partial heating areas (1THa, 1THb), are situated adjacent and parallel in relation to one another on at least a left-hand side or a right-hand side of said hob, wherein in particular said outer sides of their first partial areas (1THa, 1THb) are congruent or situated parallel next to one another over a same length in each case.

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