EP3598848A1 - Cooking hob and heating device for a cooking hob - Google Patents

Abstract

A heating device for a hob has a flat rectangular support with an outer edge, two heating elements, each of which has a heating conductor and which together form a heating surface and which are attached to the support, each heating element defining a partial heating surface and the partial heating surfaces inside the rectangular shape of the carrier. The heating elements and their partial heating surfaces can be operated independently of one another. The partial heating surfaces of the heating elements do not overlap. A first partial heating surface is rectangular, at least one of its outer sides extends to the outer edge of the carrier and runs parallel to the outer edge. A second partial heating surface covers that part of the rest of the carrier that is exposed by the first partial heating surface. Thanks to the independent operation, different configurations of heated surfaces can be achieved.

Description

Field of application and state of the art

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

Radiant heaters are a well-known and very well-proven technology for heaters. Such heaters are for example from the DE 3613902 A1 known in detail. There, several identical heating devices, each with a rectangular support, are provided on a hob, on which heating elements are arranged, advantageously two heating elements, each with a heating conductor. The heating conductors run here in an interlocking, angular-spiral manner within a jointly formed heating surface which is delimited by a circumferential, upstanding 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 as complete a heating as possible or to make the best possible use of the surface of the hob.

Task and solution

The invention has for its object to provide a heating device mentioned above 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 realize advantageous types of heating with different 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 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, regardless of this, they should be able to apply independently and independently of one another for the heating device and for the hob. The wording of the claims is made 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 it does not have to be. The outer edge can also be raised, but this is also not mandatory. In any case, the outer edge limits the wearer to the outside. The carrier has a substantially rectangular shape Shape, especially with slightly rounded or beveled corners. Opposing sides in parallel to each other are advantageous. Furthermore, the heating device has at least 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 upward radiant heat during operation.

A heating conductor is advantageously defined in that it has two ends and can be electrically connected or contacted to it for its operation. Furthermore, it is provided that the heating elements and / or the partial heating surfaces can be operated or 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 together, 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, namely 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 they run separately from one another. It can be provided that a partial area is everywhere where a heating conductor of the associated heating element runs, that is to say it is defined in terms of area by it. It is therefore advantageously also provided that no heating conductors overlap or cross. Furthermore, a first partial heating surface is rectangular. It extends with at least one of its outer sides to the outer edge of the carrier or to an inner side of this outer edge when it is pulled upwards, as has been described above. This at least one outside of the partial heating surface also runs parallel to this outer edge, to which it extends directly or close to it.

Furthermore, the heating device according to the invention has a second partial heating surface corresponding to a second heating element. This second partial heating surface covers the remaining carrier, which is left free from the first partial heating surface. It can be provided that the second partial heating surface of more than one heating element or more than one single heating conductor is formed, so that it can also be viewed as the sum of several further partial heating surfaces or is formed from several further partial heating surfaces. It is important in the context of the invention that the first partial heating surface is rectangular. The area of the carrier which is still left free from 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 provide a heating device with a carrier which has at least one separately operable rectangular partial heating surface which lies on the edge of the carrier. It can therefore be operated very well with other 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 suitable cooking vessels, for example elongated oval cookers.

The heating elements or the heating conductors are resistance heating elements and are designed to glow during operation or even to glow somewhat. They heat the cooking vessels placed above them using their radiant heating power. This is also from the above 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 be located in a corner or in a corner region of the carrier, so to speak. 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 a further heating device. In particular, it can be provided in a cooktop 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 are close together. 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 are adjacent and parallel to one another with their outer sides. Four such heating devices can even be arranged in the square, and in the center, where four corners meet, four partial heating surfaces can also meet. Their corners are then only a short distance apart, advantageously less than 2 cm to 4 cm. These four partial heating surfaces or two adjacent partial heating surfaces can then be operated together, depending on the size of a cooking vessel to be heated.

With such a hob, it is also possible, in particular, for the adjacent first partial heating surfaces of the heating devices, which lie parallel to one another, to be congruent or to be parallel to one another over the same length in each case. 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 outside 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 size for customary cooking vessel sizes, in particular even if two of them are to be 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, a square shape of the above size fits well.

The second partial heating surface preferably has an L shape, so that the first partial heating surface lies in the inner angle formed thereby. Particularly advantageously, the first partial heating surface and the second partial heating surface jointly form a rectangular or square surface, specifically covering the flat carrier up to its outer edge or to the inside thereof. As has been explained at the beginning, the second partial heating surface can in turn also be formed by a plurality of heating elements or heating conductors which can be operated separately. The second partial heating surface can preferably have legs of approximately the same width, which, however, can be of different lengths. The length difference can be a factor of 1.2 to 2.5, advantageously 1.5 to 2.

With such a configuration of a heating device, a small rectangular area corresponding to the first partial heating area can be heated separately, as a rule for a relatively small cooking vessel. Operating the second partial heating surface alone will generally not make any 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 area and the second partial heating area, 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 roasters, two adjacent heating devices can be operated completely, i.e. their first and second partial heating surfaces. There is thus a large variety of possibilities in a hob according to the invention given for the compilation of heated surfaces, whereby it can be achieved that different sized or differently shaped cooking vessels are heated as well, efficiently and quickly.

It is advantageously provided for the carrier itself that it even has a special 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 heating of different or variable surfaces in combination.

In an embodiment of the invention, an elongated temperature sensor or temperature limiter can be provided on the heating device, which runs above the heating elements or the heating conductor. 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 has been explained at the beginning, the first partial heating surface is preferably always operated, if the heating device is operated at all, it is protected against a possibly dangerous excessively high temperature. If the temperature sensor or temperature limiter 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 is the case with the DE 3705260 A1 and especially the DE 102004058473 A1 is known through the use of different materials. Basically, 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 purpose, we also refer to the above 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, as a result of which a switch is opened or closed for a specific expansion path in accordance with a specific 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 oblong one covers Temperature sensor or temperature limiter at least half the area of the first partial heating area. It can be particularly advantageously provided that the elongated temperature sensor or temperature limiter completely covers the first partial heating surface. In a further further embodiment of the invention it can be provided that the temperature sensor or temperature limiter extends from an outer edge of the carrier to the opposite outer edge of the carrier, that is to say spans the entire carrier or its surface. In this case, too, it should run above the first partial heating surface so that it is protected against excessive temperature.

As an alternative to the aforementioned elongated temperature sensor or temperature limiter, a small or punctiform 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 onto the underside of a cooktop plate of the cooktop and directly record the temperature here, since rod regulators or safety temperature limiters of this type are usually intended to monitor and limit a maximum temperature of the cooktop plate. Such a small temperature sensor can be formed by a PTC resistor, an NTC resistor or a thermocouple, thus enabling 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 too high temperature can be determined.

In one possible embodiment of the invention, combinations of the aforementioned elongated temperature sensors and small or punctiform 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 punctiform temperature sensors can be arranged on an elongated temperature sensor, for example clipped on.

In an embodiment of the invention, it is possible that another such small or punctiform temperature sensor is arranged in the region 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 the first partial heating surface are spatially somewhat separated or spaced from the electrical connections of a second partial heating surface. Different so-called connection blocks or connection plug devices can also be provided in each case. This simplifies the electrical connection when installing the heating device or the hob. Furthermore, the other sides of the heating device can then remain free of such electrical connections which inevitably protrude beyond the outside or the outside 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 can possibly even touch 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-in connection lugs can extend inwards, so that ends of the heating conductors can be welded to them.

In a cooktop, heating devices may even be arranged so close together that their outer edges touch. Especially when partial heating surfaces are operated jointly by two adjacent heating devices in a bridge operation mentioned above, it is advantageous if a non-heated area between them is as narrow as possible. In this area, it is possible that even an outer edge of the carrier which has been pulled up can 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 touching thin outer edges add up, which in turn can create an overall sufficiently thick outer edge. Furthermore, the lateral transfer of heat does not disturb so much, since the adjacent heating device which is 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 that are mirror-symmetrical to one another. They can then be arranged side by side in a hob according to the invention. A center line running centrally between the two heating devices forms an axis of symmetry for the two heating devices. In this case, the first partial heating surface is arranged in each heating device toward the adjacent heating device or its first partial heating surface, so that these two can lie side by side and can have a bridge 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 equally large heating devices are arranged next to one another in a rear region of the hob. These are advantageously both rectangular, preferably non-square. A distance between them can be particularly advantageously 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, each with the outer sides of their first partial heating surfaces, are adjacent and parallel to one another, so that they can be bridged well. The outer sides of their first partial heating surfaces are congruent or are parallel to each other over the same length. A bridge function from front to back can then be provided.

In yet another embodiment of the above-mentioned 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 mutually facing outer edges, advantageously with a very small distance as explained above. However, they are not completely congruent, but offset to the side somewhat, for example by 2 cm to 5 cm. First partial heating surfaces are provided in the corner areas on the overlapping section, advantageously in a square shape, in such a way that they are congruent with one another and with one another. This way they can be bridged together in a common operation. Particularly large roasters can then be heated in bridge mode using the two fully operated heating devices.

Basically, in a hob according to the invention, heating surfaces or partial heating surfaces can also be bridged by different heating devices, which basically have different shapes. Advantageously, however, only rectangular partial heating surfaces are operated jointly as a bridge function, even if round or oval heating devices are also provided in the hob.

These and other features emerge from the claims and also from the description and the drawings, the individual features individually or in groups be realized in the form of sub-combinations in one embodiment of the invention and in other fields and can represent advantageous and protectable designs for which protection is claimed here. The division of the application into individual sections and subheadings do not limit the general validity of the statements made under these.

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.

Exemplary embodiments of the invention are shown schematically in the drawings and are explained in more detail below. The drawings show:

Fig. 1

2 shows a plan view of a first embodiment of a heating device according to the invention with two heating elements, each of which defines a partial heating surface, the heating device having a square outer shape,

Fig. 2

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

Fig. 3

a plan view of a further heating device according to the invention based on that accordingly Fig. 1 with rectangular outer shape,

Fig. 4

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

Fig. 5

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

Fig. 6

a modification of the arrangement Fig. 5 using heaters similar Fig. 3 or 4,

Fig. 7

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

Fig. 8

another cooktop according to the invention with four square heating devices and an operating device, with four heating devices correspondingly Fig. 1 are provided and are mutually offset,

Fig. 9

another cooktop according to the invention with four heating devices and an operating device, with an arrangement of heating devices corresponding on the left Fig. 4 is provided and two round heaters of different sizes are provided on the right and

Fig. 10

another cooktop according to the invention with four heating devices and an operating device, four heating devices with the same outer shape being 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 radiation heating device is shown in plan view according to a first embodiment of the invention. The heating device 11a, as is customary for radiation heating devices, is arranged in a sheet metal shell 12a, which here has a square outer shape. The heating device 11a furthermore 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 extends around the carrier 13a, which protrudes upward and can be integrally formed on a separate part or 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 even square here. Furthermore, the outer edge 15a has an inner side 16a which, so to speak, delimits the upper side of the carrier 13a. Likewise, the outer edge 15a has an outer side 17a, with which it lies largely against a raised edge of the sheet metal shell 12a.

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

The heating device 11a also has a second heating element 22a which covers the remaining surface of the carrier 13a, so to speak. For this purpose, a second heating conductor 23a is laid in a meandering shape with different widths on the carrier 13a, it forms the second partial heating surface 2THa. The second heating conductor 23a of the second heating element 22a is guided to second connections 24a, which in turn protrude outwards through the outer edge 15a. The second partial heating surface is like that Fig. 2 shows, L-shaped or angled with the same simplifications as previously executed 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 identical long and equally wide legs.

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

On the right, a rod regulator 27a is attached to the heating device 11a and is designed as is known in the prior art. The rod regulator 27a has a rod regulator 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 up to the elevation 14a of the carrier 13a and is held by it against pressing downward. 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 need not be explained in more detail. For the Fig. 2 it is shown how the temperature sensor 29a could be extended with a dashed extension 29a ', which then also covers part of the second partial heating surface 2THa. The second heating element 22a can thus also be thermally monitored, but this need not be the case. Here, the rod controller can be compensated as a temperature sensor, as is the case with the aforementioned 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 guided or electrically connected to the rod regulator housing 29. The second connections 24a of the second heating conductor 23a are held in a so-called connection block, advantageously consisting of ceramic material. So they can easily be contacted from the side with a plug. The first connection of the connecting block is connected to the contact of the rod regulator 27a via a wire (not shown), so that when the rod 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 suitable carrier 13b is used 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 so to speak on the heater 11a Fig. 1 based, with something on 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 below shows, square and sits, so to speak, in the top 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 forms the second partial heating surface 2THb with a second heating conductor 23b, as also from FIG Fig. 4 can be seen. Also from the comparison of the Fig. 2 and 4 it can be clearly seen from one another that in the second heating device 11b, in particular in the second partial heating surface 2THb, something is set on 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 here is somewhat wider than that of the second heating surface Fig. 1 ,

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

In the Fig. 5 12 is an arrangement 31a of two heating devices 11a according to or similar to the illustration in FIG Fig. 2 shown. However, only the left heating device 11a can be seen exactly as in FIG Fig. 1 respectively. Fig. 2 formed, the right heating device 11a is only of the same design in principle, that is to say with partial heating surfaces of the same size. 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 first two partial heating surfaces 1THa and 1THa 'adjoin each other with their sides facing each other. In this regard, they are congruent because they are the same size. It can thus be seen from this that in the arrangement 31a a plurality of 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 roaster 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 together 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 isolated operation does not make sense.

In the Fig. 6 Another arrangement 31b is shown, which is basically constructed similarly to that from Fig. 5 , On the left is a heater 11b according to 3 and 4 intended. Another heating device 11b 'is provided directly to the right and only separated by a center line 32b, which has the same size and the same outer shape. It is similar to before Fig. 5 described, mirror-symmetrical to the left heating device 11b, which makes it possible for the first two partial heating surfaces 1THb and 1THb 'to be mirror-symmetrical and to bear against one another with their outer sides facing one another.

In the representations of 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 abut one another or continue. The principle underlying the invention 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 Fig. 5 described. The second partial heating surfaces 2THb, which are now somewhat larger, may make it possible to better adapt them to different sized cooking vessels.

In the Fig. 7 a top view of a cooktop 35 according to the invention is shown in a first embodiment of the invention. The hob 35 has four heating devices 11, namely two heating devices 11a and 11a 'with a square outer shape and two heating devices 11b or 11b 'with a rectangular outer shape. However, even more appropriately trained heating devices could be provided in a hob, for example six or eight heating devices. An operating device 36 is arranged in the front in the middle, advantageously with touch switches.

In the cooktop 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 on the left and right and installed close to one another. You can even touch. It can be seen how the heater 11a 'corresponds to the 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 the 3 and 4 the first partial heating surface 1THb is arranged in the lower left corner, and the L-shaped second partial heating surface 2THb extends to the right and above. 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 right arrangement of the heating devices 11a 'and 11b, the offset is chosen differently than on the left as an example for as many different possible arrangements. The two heating devices are still in direct contact with one another, as are the first partial heating surfaces 1THa 'and 1THb. However, the adjacent outer sides are no longer congruent, but somewhat offset from one another. Thus, they can each 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 it is only marginally disturbing thermally.

Another cooktop 135 according to the invention Fig. 8 has two heating devices 11a on the left accordingly 1 and 2 that are adjacent to each other, but are not congruent, but are somewhat offset. Their outer shape is square. However, the first partial heating surfaces 1THa are congruent with each other.

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

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

In the Fig. 9 Another cooktop 235 according to the invention is shown, in which an arrangement 31a corresponding to the left behind a front central operating device 236 corresponds 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 at the front and a larger round heating device 35d at the rear. These have no subdivision into different partial heating surfaces at all. Due to their size, they are well adapted to the available space also because of the operating device 236.

In the still further hob 335 according to the invention according to the 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 in an abutting manner. A special feature of these heating devices 111a and 111a ', each of which has a square outer shape, is that their first partial heating surfaces 1THa and 1THa' abut each other in the middle or in the common central region 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 other mirror-symmetrical to it. 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 completely operate the four entire heating devices 111a and 111a 'with all partial heating surfaces 1THa, 1THa', 2THa and 2THa 'for such paella pans or the like.

The associated second partial heating surfaces 2THa and 2THa 'are then grouped together as a kind of rectangular ring around them. Here, too, different bridge functions or bridge arrangements and thus a total interconnection of heating surfaces or partial heating surfaces are possible in order to be able to optimally heat different sized cooking vessels. Technically somewhat more difficult or complex is an internal electrical connection to the first partial heating surfaces 1THa and 1THa 'because they do not adjoin an exposed outside of the heating device. This can also be done by installing a suitable heating conductor. The heaters 111a and 111a 'so far apart it is possible to remove that an electrical connection possibility is created in an intermediate space. However, such a large distance harbors problems that are not desired for other reasons and foreseeably worsens the function of the bridge if the gaps are too large. Thus there is still the possibility of an electrical supply to a partial heating surface from below, or with non-glowing electrical supply lines over the respective second partial heating surface 2THa and 2THa '. For example, these can be significantly thicker and therefore cannot be heated with the same current. Alternatively, the heating conductors can be pulled straight at these points so that they are not corrugated. 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 generally narrowly along the side of the heating conductors of the other partial heating surface and thus have little or no impact on this surface.

Claims (15)

Heating device for a hob, the heating device comprising: - a flat beam with an outer edge, the carrier has a substantially rectangular shape, at least two heating elements, each of which has at least one heating conductor and which together form a heating surface,
in which - the heating conductors are attached to the carrier, - each heating element defines a partial heating surface, the heating elements and / or the partial heating surfaces can be operated independently of one another and / or each have their own electrical connections, the partial heating surfaces lie within the rectangular shape of the support,
characterized in that - the partial heating surfaces of the heating elements do not overlap, a first partial heating surface is rectangular and extends with at least one of its outer sides to the outer edge or to an inner side of the outer edge of the carrier and runs parallel to the outer edge, - A second partial heating surface covers the rest of the carrier, which is left free from the first partial heating surface. Heating device according to claim 1, characterized in that the first partial heating surface extends with two of its outer sides in each case to the outer edge or to an inner side of the outer edge of the carrier and runs parallel to it, in particular the first partial heating surface lying in a corner of the carrier. Heating device according to claim 1 or 2, characterized in that the first partial heating surface has a square shape, in particular an outside having a length between 110 mm and 150 mm. Heating device according to one of the preceding claims, characterized in that the second partial heating surface has an L-shape, preferably with legs of approximately the same width, in particular with legs of different lengths. Heating device according to one of the preceding claims, characterized in that the carrier has a square shape. Heating device according to one of the preceding claims, characterized in that the first partial heating surface is square. Heating device according to one of the preceding claims, characterized in that an elongated temperature sensor or temperature limiter extends above the heating elements over at least the first partial heating surface, preferably also partially over the second partial heating surface. Heating device according to claim 7, characterized in that the elongate 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 temperature sensor or temperature limiter over at least the first partial heating surface, preferably to the opposite outer edge of the carrier , Heating device according to one of claims 1 to 6, characterized in that a small or point-shaped temperature sensor is arranged above at least the first partial heating surface, preferably another point-shaped temperature sensor being arranged above the second partial heating surface. Hob with several heating devices according to one of the preceding claims, wherein two heating devices are arranged side by side such that the respective first partial heating surfaces of the two heating devices are adjacent and parallel to one another with their outer sides. Hob according to claim 10, characterized in that the at least two heating devices are arranged side by side with a small distance, preferably less than 2 cm, in particular the respective first partial heating surfaces of the two heating devices with their outer sides congruent or parallel over the same length lie. Hob according to claim 10 or 11, characterized in that the two heating devices arranged next to one another touch with their outer edges. Hob according to one of claims 10 to 12, characterized in that the two heating devices arranged next to one another are mirror-symmetrical, a center line running centrally between the two heating devices forming an axis of mirror symmetry. Hob according to one of claims 10 to 13, characterized by further heating devices which are round or oval. Hob according to one of claims 10 to 14, characterized in that exactly two equally large rectangular heating devices are arranged next to one another in a rear region of the hob, preferably at a distance between 2 cm and 10 cm from one another, with exactly two in a front region of the hob Rectangular heating devices of the same size are arranged next to one another, with the two heating devices, each with the outer sides of their first partial heating surfaces, being adjacent and parallel to one another on at least the left or right side of the hob, in particular the outer sides of their first partial heating surfaces being congruent or respectively lie parallel next to each other over the same length.

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