DE102013212814A1 - Operating device with a control with magnets held cap and base and home appliance with such an operating device - Google Patents

Abstract

The invention relates to an operating device (8) for a domestic appliance (1), having an operating element receptacle (9) of the household appliance (1) which can be controlled by the operating device (8) by means of magnetic force and relative to the operating element receptacle (9 ) and is detachably positionable from there, and the operating element (10) has an operating element base (10b) and an operating element cap (10a) covering the operating element base (10b) from above, at least in regions, the operating element cap (10a) and the operating element base (10b) non-destructively releasably connected by means of magnetic holding force, in particular for axially connecting and holding a holding magnet (27) of the control element cap (10a) and a holding magnet (28) of the control element base (10b) are each arranged centrally. The invention also relates to a household appliance (1) with an operating device (8).

Description

The invention relates to an operating device for a household appliance with an operating element which is durable on a control element receptacle of the controllable with the operating device household appliance by magnetic force and relative to the control element holder movable and detachably positioned from there. The operating element comprises a control element base and a control element cap covering the control element base from above, at least in regions. The control cap is connected to the control element base and rotatable relative to the control element base for setting operating conditions of the household appliance.

Such operating devices are known. For example, shows the DE 102 12 953 A1 an operating device for an electrical appliance, in which an operating unit has a disc-shaped bearing device and a rotary knob rotatably mounted thereon. By means of holding magnets, the operating unit is removably attached to a cover, which is a hob plate. In a space between the rotary knob and the bearing device, a metallic padding is arranged on the rotary knob. At the ends of the upholstery angular heels are formed, for which correspondingly below the cover Hall sensors are arranged. The ends of the padding are magnetically active or populated with small magnets so that a signal is triggered when moving across the Hall sensors. The Hall sensors are in turn connected to a controller so that the signal generated by the rotation can be evaluated and the associated operating condition setting made.

In such an embodiment, the rotational position adjustment and recognition may be subject to tolerances, so that it may possibly lead to misinterpretations of the rotational position and thus undesirable operating condition settings may occur.

Moreover, it is provided in the prior art that the bearing device is seated with its underside on the top of the hob plate of glass ceramic and is held on the other hand only by a magnet of the bearing device on the one hand and an interacting further magnet under the cooktop plate. Especially in these embodiments, in which the bearing device is formed flat on its underside and is positioned on a flat surface on the cover and thus the cooktop panel, an undesired slipping can occur when pressing the rotary knob, so that errors in the detection and the Operating condition setting may occur.

It is an object of the present invention to provide an operating device and a household appliance, in which or at which the rotational position setting in a control element with a control element base and a relative rotatable control element cap specified and unwanted movements of the operating element during the movement of the control element cap are prevented.

This object is achieved by an operating device and a household appliance according to the independent claims.

An operating device according to the invention for a household appliance comprises an operating element, which has a control element base and a control element cap covering the control element base from above, at least in regions. The control cap is connected to the control element base and rotatable relative to the control element base for setting operating conditions of the household appliance.

In particular, it is provided that the operating element on a control element holder of the operating device by means of magnetic force durable and relative to the control element holder is movable and detachably positioned from there.

An essential idea of the invention can be seen in the fact that the control element cap and the operating element base are non-destructively releasably connected by means of magnetic holding force. By such a configuration, a reversibly repeatable separation and reassembly of the control cap and the control element base can be easily performed. By this configuration, the cleaning of the individual components of the operating element is improved. In addition, the accessibility to the receiving space is achieved, whereby installation or maintenance or replacement work can be easily performed. As a result, a very fast separation and positionally accurate connection of the control cap and the control element socket is possible.

In particular, for axially connecting and holding the control element cap with the control element base, a holding magnet on the control element cap and a holding magnet on the control element base are respectively arranged centrally and magnetically interacting. In this embodiment, two magnets are each formed with a north pole and a south pole and specifically positioned.

In particular, it is provided that the holding magnet in the control element base for magnetic interaction with a control element-external central magnet for magnetic holding the entire operating element is formed on the operating element holder. This is a particularly advantageous embodiment, since with three magnets on the one hand the holding connection between the two separate parts of the control element cap and the control element base is reached and on the other hand, the entire control can then also be held on the control element holder. The holding magnet in the control element base is thus designed to be multifunctional with regard to its holding action and enters with two further, in particular in the axial direction, magnets in corresponding holding interaction. This concept also allows a very space-saving design.

It can also be provided that for axially connecting and holding a holding magnet on the control element cap and a magnetically interacting component, in particular a ferromagnetic element, are arranged on the control element base. In such an embodiment, an at least two-pole magnet can be saved and used, for example, a metal element for magnetic interaction. For example, a metallic plate may be provided for this purpose.

In particular, it is provided in this alternative embodiment that the magnetically interacting component in the control element base with a control element external central magnet, which has at least one north pole and at least one south pole, for magnetically holding the entire operating element on the control element holder is magnetically coupled.

It can be provided in a further embodiment that a holding magnet on the control element base and a magnetically interacting component, in particular a ferromagnetic element, are arranged on the control element cap. Again, thus at least a two-pole magnet is saved. For example, a metallic plate may be provided as a ferromagnetic element.

In this further alternative, preferably, the holding magnet in the control element base with a control element external magnetically interacting component, in particular a ferromagnetic element, for magnetically holding the entire operating element on the control element holder magnetically coupled.

It is preferably provided that at least one adhesive element, whose material has a greater frictional resistance or coefficient of friction than the underside, is formed on a underside of the control element socket facing the operating element receptacle positioned on the control element receptacle. As a result, the rotational position adjustment is specified in an operating element with a control element base and a relative thereto rotatable control cap and unwanted movements of the control element in the movement of the control element cap are prevented. As a result, incorrect operations can be at least reduced and a user-friendly and reliable operation of the operating device is achieved.

Even in the position of the operating element positioned on the operating element holder and relative movement between the operating element cap and the operating element base, a position-safe arrangement in the operating element receptacle is achieved.

It is preferably provided that the adhesive element protrudes downwards over the flat underside. As a result, the support and adhesive effect of the adhesive element is improved, since at least a large part of the weight acts on the adhesive element on the control element receiving and thus the position assurance is further improved. Nevertheless, the underside is not fully formed with the adhesive element, which has advantages in terms of material costs, manufacturing and the haptic feel when attacking by a user. It is the adhesive effect and the displacement protection increases, since the control element is then also substantially above this adhesive element on the control element receptacle and thus by the weight force the displacement safety is increased in a direction perpendicular to the axis of rotation.

Preferably, a groove is formed on the underside, in which the adhesive element is arranged. A mechanically stable attachment is thus achieved permanently and an undesirably large projection of the adhesive element on the underside is prevented, which also has advantages in the handling of the operating element when placed on the control element holder. An undesirable deformation or abrasion of the adhesive element is thereby also prevented. The introduction into a groove also prevents undesired deformation or abrasion of the adhesive element.

Preferably, the adhesive element is formed as a circumferential ring, which brings the uniform adhesive retention in each radial direction with it. It is preferably provided that the adhesive element is designed as a circumferential ring, which is arranged rotationally symmetrical about the axis of rotation of the operating element. Thereby achieved a circumferential and thus interruption-free edition of the adhesive element. It is characterized also a circumferential and thus interruption-free edition of the adhesive element given so that in all Verschieberungen also a very uniform adhesion effect can be achieved.

Preferably, the adhesive element is formed from a liquid silicone, which favors the above-mentioned advantages and even with larger temperature differences, as they may occur in a hob, the functionality of the adhesive element is not affected.

It is preferably provided that the operating device has an infrared transmitting-receiving device for selecting a functional subunit of the household appliance. The infrared transmitting-receiving device comprises transceiver units, which are arranged outside the control element base under the control element base and are designed to be detected by a bottom of the control element base permeable to at least infrared signals. Such an embodiment with an infrared detection allows in a direction perpendicular to a longitudinal axis of the operating element a particularly compact structure and a very reliable detection of a selection of the functional subunit.

In this context, it is preferably provided that a number of transceiver units corresponding to the functional subunits is arranged below the operating element and preferably on a circuit carrier which is arranged below a control element receptacle.

It is particularly advantageous that, in addition to the infrared permeability of the bottom of the control element base, a cover of the control element cap is at least partially permeable to infrared signals. Touched in this context, a user at specific locations on an upper side of the lid, the control element cap, this can be detected by the infrared detection and the positionally associated each functional subunit can be selected.

By then subsequent adjustment of an operating parameter of the functional part unit, which can be done by turning the control cap, then this value setting of the operating parameter is made possible. In particular, each rotational position which is set is then linked to a specific value of this operating parameter of the functional subunit.

Thus, for example, in a domestic appliance for preparing food, in particular a hob, be provided that a specific associated cooking zone is selected by a certain positional touch a top of the lid of the control cap and then subsequently by turning the control cap a desired cooking level of this selected cooking zone can be adjusted.

It is preferably provided that the bottom of the control element base is made of a plastic, preferably PSU (polysulfone) or PESU (polyethersulfone).

These plastics are particularly advantageous since they have advantageous mechanical and optical properties with respect to stability and torsional stiffness on the one hand and wavelength permeability on the other hand. In addition, they are also very robust against even very fluctuating temperature influences, as may be the case, for example, when used in a cooking appliance, such as a hob. These plastic materials are very heat-resistant and, however, also have the required transparency in the spectral range visible to humans and in the infrared radiation range.

It is preferably provided that on a lower side or an inner side of the lid of the control element cap rotation detection markings are formed. Depending on the respectively set rotational position and an externally to the operating element arranged rotational position detection device then the rotational position is detected and then linked operating condition setting, in particular the setting of a cooking level of a cooking zone performed. The rotary position detection device or rotary position detection device is preferably arranged below the control element receptacle and thus also below a hob plate of a hob. It is in particular positioned on a circuit carrier. The rotational position detection device preferably comprises detectors which detect the rotational position on the basis of an optical function. For this purpose, an evaluation of the radiation passing through the control element base by the detectors is preferably evaluated. Depending on whether this emitted light of the detectors when turning the control cap is swept by one or more rotation detection marks, then the respectively associated rotational position and the associated operating condition setting is detected.

It is preferably provided that the bottom of the control element base and the lid of the control element cap in the respectively required surface areas for the respective wavelengths of the infrared signals and / or the optical signals are permeable to then perform the respective functions and to obtain the desired information.

In addition, it can also be provided that in the receiving space of the operating element at least one light guide is arranged, which is preferably arranged in a recess of the control element base. By means of such a design with a light guide, a user can also be presented with visual information on the control element. Thus, it can also be displayed in the context whether the desired selection of the functional subunit has taken place, so that this can be perceived quickly and intuitively by a user.

In a particularly advantageous manner, it is provided that the infrared transmitting-receiving device is designed and arranged such that the transceiver units are arranged under the light guide and are formed in a particularly advantageous embodiment for axial detection through the light guide. When viewed in the direction of the longitudinal axis of the operating element, the light guide thus covers the infrared transmitting-receiving units, as it were, from above. Such a configuration allows a particularly compact construction in a direction perpendicular to a longitudinal axis of the control element, since the light guide and the receiving device are quasi positioned with each other. The infrared radiation can thus be emitted upwards through the light guide, so that the light in the light guide would not be affected. The coupled through the light guide, passed through and again decoupled light is in particular light in the visible for human spectral range.

The arrangement of the optical waveguide and the infrared transceiver units also allows the infrared signal passing through the optical waveguide from above to reach the infrared transceiver device underneath without any restriction.

It is preferably provided that the light guide is designed as an annular disc-shaped body, at the edge of an upwardly raised web is formed as a light outcoupling region. This embodiment of the optical waveguide allows a very flat design of the light guide from Lichteinkoppelbereich to the light coupling area forming web, which is also very stable and torsionally rigid by the ring structure. By the web as Lichtauskoppelbereich this is defined geometrically and with respect to the orientation exactly and remains in the context of permanently positionally obtained accordingly, so that the direction of the light emission from the Lichtauskoppelbereich is very precise. In particular, the light guide is designed in one piece.

The optical waveguide comprises a light coupling-in area which, viewed in the radial direction and thus perpendicular to the longitudinal axis, is arranged closer to the longitudinal axis than the light coupling-out area. In particular, it is provided that light sources are arranged below the light input region of the light guide and are positioned outside the control element. The light sources are preferably positioned on a circuit carrier, which is arranged under a control element receptacle.

Preferably, a receiving space is formed between the control element base and the control element cap, in which a Drehstellungseinstelleinrichtung is arranged. The Drehstellungseinstelleinrichtung is formed for rotational position adjustment and rotational position holder and can therefore also be referred to as Drehstellungseinstell- and rotational position holding device.

The Drehstellungseinstelleinrichtung includes first Drehstellungseinstellmittel, which are arranged on the control element base in this receiving space. The Drehstellungseinstelleinrichtung includes second Drehstellungseinstellmittel, which are arranged on the control element cap and are also arranged in the receiving space. The second Drehstellungseinstellmittel are adapted to adjust a rotational position of the control cap relative to the control element base for interaction with the first Drehstellungseinstellmitteln. By such a configuration, special advantages are achieved. On the one hand, a Drehstellungseinstelleinrichtung is thus provided in which the corresponding means are arranged very close to each other, whereby the interaction and the precision in the adjustment of the rotational position is increased. In addition, a compact structure is achieved by such integration of this rotational adjustment means in the receiving space. Not least, the Drehstellungseinstellmittel are thus protected protected, so that contamination is prevented. Furthermore, they are protected by the arrangement in the receiving space in the control element and thus in the interior of the control element from undesirable temperature influences.

In particular, it is provided that the first Drehstellungseinstellmittel are magnets having a first magnetic polarity on the second Drehstellungseinstellmitteln facing sides. Preferably, the second Drehstellungseinstellmittel are magnets which also have a first magnetic polarity on the first Drehstellungseinstellmitteln facing sides. This embodiment is particularly advantageous because a magnetic interaction of the Drehstellungseinstellmittel on the one hand is very accurate and on the other hand such magnets are permanently functional and robust. Just by such a polarity of the magnets can in the relative rotation of the control element cap to the control element base the above-mentioned precision of the rotational position adjustment can be increased again, as well as a rejection behavior in a certain range of motion about an axis of rotation of the control element cap also virtually an undesired rotational position is prevented. Because of the repulsion of the magnets is then optionally automatically carried out a further rotation of the control element cap.

It is preferably provided that the Drehstellungseinstelleinrichtung is designed for haptically perceptible adjustment of a rotational position. This is a very noteworthy embodiment because the user receives feedback as to whether he has already reached a rotational position required for an operating condition setting. In addition, the reliable setting of the rotational position can be achieved by such a haptic perceptible configuration and this positionally highly accurate and accurate possible. Unwanted tolerances in the rotational position adjustment and associated possible misinterpretations of the rotational position with respect to the then connected desired operating condition setting of the household appliance can be avoided.

It is preferably provided that a rotational position is formed as a haptic perceptible latching by a non-contact interaction of the first and second Drehstellungsseinstellmittel. This is particularly advantageous to the effect that with the possibility of an endless rotation of the control element cap to the control element base about an axis of rotation of the user would be quasi relatively disoriented with respect to the already covered rotary travel. By such latching of the operating user clearly experiences the position of the desired rotational position, which is then also held both in the direction of rotation in a clockwise direction about the axis of rotation and counterclockwise. The further movement of the control cap both counterclockwise and clockwise then calls each conscious operation with a dedicated effort required by a user to solve this locked rotary position again. This haptic perceptible latching is thus in the context of no actual mechanical coupling between two components, but is perceived by the contact only interaction of Drehstellungseinstellmittel only correspondingly. In particular, this is particularly advantageous in the configuration of the opposite pole magnets of the Drehstellungseinstellmittel.

It is preferably provided that the first Drehstellungseinstellmittel are arranged in the circumferential direction about an axis of rotation of the control element cap and the second Drehstellungseinstellmittel are arranged in the direction of rotation about the axis of rotation. In particular, it is provided that the first and the second Drehstellungseinstellmittel are each arranged on a circle about the axis of rotation, wherein the two circles preferably have the same radius. The first and second rotational position adjustment means are therefore on different parallel planes, the planes extending perpendicular to the axis of rotation.

In particular, the first Drehstellungseinstellmittel are spaced in a first circle about the axis of rotation and arranged equidistant from each other. The same is also provided for the second Drehstellungseinstellmittel to a second circle.

By this arrangement on each circles and in particular on such circles, the same radius, the above advantages in terms of exact interaction and thus high precision in the rotational position adjustment and support are favored. Just the rotational position holder is achieved by the said embodiment with the explained magnets particularly precise and reliable. The haptic perceptible locking is thereby targeted by the user and exactly understandable.

Preferably, it is provided that viewed at a set rotational position in the direction of the axis of rotation about the axis of rotation circumferentially a second Drehstellungseinstellmittel between two first Drehstellungseinstellmitteln is arranged. Thus, looking at the operating element along the axis of rotation and projecting the first and second rotational position setting means into a plane of projection, the first and second rotational position setting means preferably lie on a circle of equal radius and a first rotational position setting means is disposed between two second rotational position setting means on this circle. Especially in an embodiment in which the Drehstellungseinstellmittel are magnets with appropriate polarity, this variant is particularly advantageous. Due to the magnetic interaction is achieved that a second Drehstellungseinstellmittel is held quasi exactly midway between two first Drehstellungseinstellmittel and thus the set rotational position is reached and held very precisely.

In particular, it is provided that the number of first Drehstellungseinstellmittel is greater than the number of second Drehstellungseinstellmittel. It is preferably provided that two second Drehstellungseinstellmittel are arranged on the control cap and at the control element socket at least eight, in particular at least ten, preferably twelve first Drehstellungseinstellmittel are arranged. These Drehstellungseinstellmittel are preferably each arranged on a circle about the axis of rotation. Just by the arrangement of the Drehstellungseinstellmittel in the receiving space of the control element and both on the control element cap and on the control element base allows in addition to the advantages already mentioned above such a corresponding high number of first Drehstellungseinstellmitteln. Due to the immediately adjacent arrangement of the first and second Drehstellungseinstellmittel even with such a relatively high number of first Drehstellungseinstellmitteln a precise detection of the respective rotational position of the control element cap is made possible relative to the control element base. It can be made possible by the high number of first Drehstellungseinstellmitteln a large number of different rotational positions and precisely adjusted and maintained. As a result, the functionality of the operating device can be increased, since with an increasing number of different rotational positions, an increasing number of associated or linked operating condition settings is achieved.

Further features of the invention will become apparent from the claims, the figures and the description of the figures. The features and feature combinations mentioned above in the description as well as the features and feature combinations mentioned below in the description of the figures and / or in the figures alone can be used not only in the respectively specified combination but also in other combinations or in isolation, without the scope of To leave invention. Thus, embodiments of the invention are to be regarded as encompassed and disclosed, which are not explicitly shown and explained in the figures, however, emerge and can be produced by separated combinations of features from the embodiments explained.

Embodiments of the invention are explained in more detail below with reference to schematic drawings. Show it:

1 a perspective view of an embodiment of a household appliance according to the invention;

2 a perspective sectional view of the household appliance according to 1 ;

3 a sectional view of the embodiment in 2 ;

4 a plan view of subcomponents of the operating device according to 1 and 2 as installed in the household appliance;

5 a view of an underside of a lid of the operating element of the operating device according to 2 and 3 ;

6 a perspective sectional view of another embodiment of an operating element of the operating device; and

7 an exploded view of the operating element according to 6 ,

In the figures, identical or functionally identical elements are provided with the same reference numerals.

In 1 is in a schematic representation as a hob 1 trained household appliance for preparing food shown. The stove top 1 comprises a cooking field plate designed as a household appliance plate 2 , which may be formed of glass or glass ceramic. On a top 2a the hob plate 2 are in number, position and shaping only exemplary five cooking zones 3 . 4 . 5 . 6 and 7 shown.

Under the hob plate 2 are in 1 not shown heating units arranged around the surface areas of the cooking zones 3 to 7 being able to heat, being on the cooking zones 3 to 7 Preparation vessels with food for preparation can be set up. In the context, for example, both radiant heaters and inductors are to be understood as heating units, in which appropriate energy is introduced for heating the food in preparation vessels. In inductors, as is known, the cooking zones 3 to 7 in the form of the material of the hob plate 2 not directly heated, but heated by the electromagnetic interaction only the preparation vessel directly.

The stove top 1 also includes an operating device 8th , which in the embodiment in the front region of the hob plate 2 is arranged. The operating device 8th includes a control element receptacle 9 , which in the embodiment in the hob plate 2 is arranged. In the control panel recording 9 is a control 10 positionable. The operating element 10 is configured in the embodiment disc-shaped or discus-shaped and non-destructive releasable and thus reversibly removable and replaceable on the hob plate 2 , in particular the control element recording 9 , educated. The control element holder 9 may be a separate to the hob plate insert or may be a partial surface area of the hob plate 2 be.

In 2 is in a perspective sectional view along the section line II-II the hob 1 in the area of the operating device 8th shown.

The operating device 8th includes under the hob plate 2 a circuit carrier 11 , on which a control element external central magnet or holding magnet 12 is arranged. The holding magnet 12 is arranged in a receptacle that serves as a partition 13 at least partially circumferentially about an axis A, which is the longitudinal axis of the operating device 8th and thus also the operating element 10 represents arranged. In a direction perpendicular to the axis A and thus in the radial direction is directly on the holding magnet 12 and the partition 13 then a plurality of light sources 14 positioned. The light sources 14 are spaced in the direction of rotation about the axis A and arranged equidistant from each other. The light sources 14 are preferably light emitting diodes.

Again radially outward to the light sources 14 is another wall 15 trained, which is assigned to a housing component-specific. To this enclosure is also the inner receptacle or the partition wall 13 belong. In the embodiment, the wall 15 Part of a circumferential ring 16 , Through the wall 15 or the ring 16 a Streufichtabschottung is achieved, so that the light from the light sources 14 does not undesirably exude sideways outward. The operating device 8th also includes an infrared transceiver 17 ( 4 ), a plurality, in the exemplary embodiment five, transceiver units 18 having. The number of transceiver units 18 corresponds to the number of cooking zones 3 to 7 , The transceiver units 18 are by enclosures 19 also surrounded laterally accordingly, so that the detection is improved and also here no stray light effects or the like can act.

In addition, the operating device includes 8th still detectors 20 ( 5 ) and 21 , by means of which a rotation detection or a rotation detection of the operating element 10 about the axis of rotation or longitudinal axis A relative to the top 2a and thus also for control element recording 9 is detectable.

It is at this point to mention that the operating element 10 a control cap 10a and a control base 10b having. The control panel 10b and the control cap 10a are relatively movable and in the context of the axis A relative to each other rotatable.

The entire operating element 10 and thus the control cap 10a and the control base 10b are by magnetic holding forces on the operating element holder 9 non-destructively releasably attachable.

For this purpose, it is provided that an internal control further holding magnet 27 in the control panel 10b is arranged. This holding magnet 27 occurs in magnetic interaction with the central magnet or control element external holding magnet 12 to the entire control 10 on the control panel receptacle 9 to keep.

To connect the control cap 10a and the control base 10b is a third holding magnet 38 provided in the control cap 10a is attached.

Due to the magnetic interaction of the holding magnets 27 and 38 centrally located in the control element 10 are arranged, at least one sure axial holding the control cap 10a to the control panel socket 10b reached.

As from the illustration in 2 The three magnets are recognizable 12 . 27 and 38 all arranged in a vertical direction one above the other and in particular also positioned coaxially to the axis A. By such a configuration and arrangement of the holding magnets 27 and 38 on the one hand, the axial holding, on the other hand, the relative mobility and in particular the relative rotation of the control cap 10a to the control panel socket 10b reached. The control panel 10b is in the mounted state of the operating element 10 on the control element holder 9 Positionally positioned.

As from the illustration in 2 is to be further seen, viewed in the vertical direction and thus in the direction of the axis A, the transceiver units 18 within the dimensions of the control 10 arranged and in particular under a light guide 22 positioned.

The light guide 22 is arranged inside the control element and thus in a receiving space 39 arranged, the receiving space 39 through the control cap 10a and the control base 10b is limited or enveloped.

The control cap 10a includes a lid 23 , wherein the operating base 10b a floor 24 having. A jacket wall 25 is integral with the ground 24 connected and thus the control element socket 10b belong.

On a the recording room 39 facing inside of the floor 25 is beyond a recording 26 for the holding magnet 27 educated.

The circuit carrier 11 with its elements arranged on it, as in 2 are visible below the hob plate 2 arranged, whereas the operating element 10 on the Operating element receptacle 9 over the top 2a attachable.

The light guide 22 includes a light input region 28 , which is arranged closer to the axis A, as a Lichtauskoppelbereich 29 , The light guide 22 is designed as an annular disc, wherein on its axis A remote from the radial outer end an upwardly extending raised web 30 is formed, which then at its end the Lichtauskoppelbereich 29 forms. The light sources 14 are viewed in the direction of the axis A in a straight line extension below the Lichteinkoppelbereich 28 educated.

The floor 24 is fully formed and thus covers the light guide 22 completely from below. The light of the light sources 14 Thus, first through the ground 24 and then to the light coupling area 28 radiated. The floor 24 is preferably permeable to light in the visible to human spectral range as well as infrared rays. In particular, the bottom is made of a plastic, preferably of PSU or PESU. By means of the infrared transceiver 17 and thus also with the transceiver units 18 , which operate on the basis of the detection of infrared rays, a configuration is formed, which is designed to detect a selection of a functional subunit of the hob. In particular, this device 17 designed to select a cooking zone 3 to 7 capture. For this purpose, each of the infrared transmitting-receiving units 18 with one of the cooking zones 3 to 7 linked to the desired selection, which is then recognized and evaluated by a control unit, not shown, and then the respective cooking zone 3 to 7 associated heating unit is activated. In this context, it is provided that a user, for example with a finger on a top 31 of the lid 23 locally specifically picks up or hangs up the finger accordingly, so that this on the infrared transceiver units 18 is recognized locally. For example, provided that the cooking zone 4 should be selected, the user puts a finger on the top 31 at the local specified designated area at the top 31 on, located vertically above the associated infrared transceiver unit 18 located. For example, in the context of the plan view of the circuit carrier 11 in 4 the lower left infrared transceiver unit 18 be. The in the direction of rotation about the axis A, according to 4 perpendicular to the plane of the figure, subsequent infrared transceiver unit 18 is then the cooking zone 5 associated with the then in the direction of rotation in the clockwise direction about the axis A in turn subsequent infrared transceiver unit 18 the cooking zone 3 is assigned, then the subsequent Infra-transceiver unit of the cooking zone 6 is assigned and finally in the direction of rotation in a clockwise direction about the axis A in 4 right and front and bottom arranged the infrared transceiver unit 18 the cooking zone 7 assigned.

The lid 23 is formed in the embodiment of a chemically hardened glass and locally locally opaque and permeable to other locally local surface areas for light in the visible to human spectral range and infrared rays.

In addition, the operating element includes 10 an annular end element 32 , which is the control cap 10a is associated. This final element 32 overlaps the outside of the shell wall 25 , so that in the axial direction, an overlap between the jacket wall 25 and the final element 32 given is.

The final element 32 also encompasses a margin 33 of the lid 23 , In addition, this end element includes 32 an upper flange or a support web 34 that on the top 31 rests. Preferably, this end element 32 made of stainless steel or plastic.

The light guide 22 is with its decoupling area 29 completely off the lid 23 covered, the partial surface of the lid 23 , which in the vertical direction over the Lichtauskoppelbereich 29 is arranged, is transparent to light in the visible spectral range and also for infrared rays.

For the design of the respective partial surfaces of a bottom 40 of the lid 23 is as shown in 5 giving a view on this bottom 40 of the lid 23 shows an annular imprint or a foil 35 is provided, which is transparent to light in the visible spectral range and infrared rays. Radially inward following this the surface of the underside 40 as outer circumferential ring forming film 35 is a printed or foil-covered area 36 formed, which is impermeable to infrared rays and light in the visible spectral range. In this surface area, a plurality of adjacent in the circumferential direction about the axis A and spaced from each other markings 37 formed, which are designed in particular white color. Through these markings 27 is done by means of the detectors 20 and 21 the direction of rotation and the rotation of the control cap 10a about the axis A and determines therefrom the desired setting of an operating parameter of the selected functional units of the cooking zone 3 to 7 set. In particular, by this direction of rotation and the rotation is the Cooking level of the selected cooking zone 3 to 7 set.

The marks 37 are positioned radially so that they turn when turning the control 9 around axis A to above the detectors 20 and 21 Run away and thereby recognized and adjusted rather than the direction of rotation and the desired uniformity of the cooking stage. This is particularly dependent on how many such marks 37 via at least one detector 20 . 21 away or pass by.

In 3 is a sectional view of the 2 shown, here the hob plate 2 with attached control 10 is shown.

As can be seen there, the ground points 24 a bottom 24a on. In this bottom 24a that on the top 2a the hob plate 2 can partially rest when the operating element 10 in the control panel recording 9 is arranged resting, is a circumferential groove 41 formed, which thus represents an annular groove. In this groove 41 is an adhesive element 42 arranged, which from the groove 41 partially down to the bottom 24a is arranged protruding. This adhesive element 42 has a greater frictional resistance than the bottom 24a , In particular, this adhesive element 42 made of liquid silicone. Such a configuration improves the adhesion and the slip resistance of the attached operating element 10 achieved what just in this multi-part design of the control 10 with a rotating control cap 10a is advantageous.

The operating element 10 is thus on the control element recording 9 Applied state by the magnetic interaction between the holding magnets 12 and 27 and the adhesive element 42 held axially and radially. The magnetic interaction between the holding magnets contributes 12 and 27 reinforced for axial position guide, whereas the adhesive element 42 essentially contributes to horizontal and thus radial slip resistance.

In the recording room 39 of the operating element 10 is also a Drehstellungseinstelleinrichtung 43 educated. This Drehstellungseinstelleinrichtung 43 is thus completely configured inside the control element and comprises first Drehstellungseinstellmittel acting as magnets 44 in the control panel 10b are arranged. In the exemplary embodiment it is provided that in the control element base 10b at least eight, preferably at least ten, in particular twelve such magnets 44 are arranged. They are spaced in a circle about the axis A and arranged equidistant from each other.

The Drehstellungseinstelleinrichtung 43 moreover comprises second Drehstellungseinstellmittel acting as magnets 45 are formed and in the control cap 10a are arranged. The magnets 44 point to the magnet 45 facing sides the same magnetic polarity as the magnets 45 on the magnets 44 facing sides. The number of these magnets 45 is smaller than the number of magnets 44 , In the exemplary embodiment it is provided that the number of magnets 45 two or four.

These magnets 45 are also arranged on a circle about the axis A, wherein the radius of this circle of magnets 45 equal or substantially equal to the radius of the circle of magnets 44 is.

The magnets 44 are for rotational position adjustment in magnetic interaction with the magnets 45 , It is provided that the Drehstellungseinstelleinrichtung 43 is designed for haptically perceptible adjustment of a rotational position for a user. In particular, it is provided that by the non-contact interaction of the magnets 44 and 45 a rotational position is formed as a haptic perceptible latching. In the embodiment shown, a rotational position is reached when a magnet 45 in a projection view along the axis A between two magnets 44 is arranged. Due to the corresponding polarity of the magnets 44 and 45 It virtually prevents a magnet 45 viewed vertically above a magnet 44 is arranged and then the control cap 10a would remain independent in such a position. Rather, by the design of the magnets 44 and 45 a quasi-self-holding rotational position of the control element cap 10a relative to the control base 10b then reached when the magnet 45 exactly between two adjacent magnets 44 is positioned along the axis A in a corresponding projection view. This then also perceptible haptic latching in this rotational position is due to the non-contact magnetic interaction with respect to the repulsion of the magnets 44 and 45 allows. The user can thus intuitively and easily understand the respective rotational position and the associated adjustment of the operating parameter value for the selected functional subunit in the form of a cooking zone 3 to 7 also feel. Preferably, each possible rotary position is assigned an individual operating parameter value, so that corresponding settings are possible.

Due to the functionality and design of the Drehstellungseinstelleinrichtung 43 In this regard, the rotational position adjustment and then the attitude of the set rotational position are reached.

As you can see, the magnets are 44 arranged on a circle in the radial direction with a larger radius like the dividing wall 13 is formed, but immediately adjacent thereto runs. As a result, the further radial area between the web and the magnets 44 not occupied, so that thereby the transmission and reception of the optical signals and the infrared signals can take place unhindered. The magnets are also corresponding 45 on the circuit provided for this purpose, relatively close to the holding magnet 38 arranged.

As from the illustration in 3 can also be seen, includes the control cap 10a a carrier part 46 which at the bottom 40 of the lid 23 is arranged and both the magnets 45 as well as the holding magnet 38 wearing.

It should be mentioned that in 3 a sectional view is shown, in which the control cap 10a aware in a position relative to the control element base 10b is held, where the magnets 44 and 45 lie one above the other, in this regard, the respective radial positions of the magnets 44 and 45 to clarify. It has already been explained above that such a position due to the repulsion of the magnets 44 and 45 is not given and no self-holding rotary position and haptic perceptible catch represents.

In 6 is an exploded view of the control element in a further perspective sectional view 10 according to the illustrations in 2 and 3 shown. One the magnets 44 receiving annular support plate 47 of the control base 10b can be seen.

In 7 is a full exploded view of the control 10 according to 2 . 3 and 6 shown. There is also a ring 48 to recognize the carrier plate 46 encompasses the circumference.

It can also be provided that the magnet 27 is replaced by a ferromagnetic element, such as a metallic plate, and the magnets 38 and 12 are formed.

Likewise, it can be provided that the magnet 27 is formed and the magnets 38 and 12 are replaced by ferromagnetic elements, in particular metallic plates.

It is preferably provided in the embodiments that the magnetic holding force between the magnetically interacting elements in the control element cap 10a and the control base 10b is greater than the magnetic holding force between the magnetically interacting elements in the control panel 10b and the control element external element.

LIST OF REFERENCE NUMBERS

1

 hob

2

 Hotplate

2a

 top

3

 cooking zones

4

 cooking zones

5

 cooking zones

6

 cooking zones

7

 cooking zones

8th

 operating device

9

 Operating element receptacle

10

 operating element

10a

 Control element cap

10b

 Operating element base

11

 circuit support

12

 holding magnet

13

 admission

14

 light sources

15

 wall

16

 ring

17

 Infrared transceiver

18

 Transceiver units

19

 enclosures

20

 detector

21

 detector

22

 optical fiber

23

 cover

24

 ground

24a

 bottom

25

 shell wall

26

 admission

27

 holding magnet

28

 Lichteinkoppelbereich

29

 Lichtauskoppelbereich

30

 web

31

 top

32

 termination element

33

 margin

34

 support web

35

 foil

36

 Area

37

 marks

38

 holding magnet

39

 accommodation space

40

 bottom

41

 groove

42

 adhesive element

43

 Rotary position device

44

 magnets

45

 magnets

46

 support part

47

 support plate

48

 ring

A

 axis

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10212953 A1 [0002]

Claims (15)

Operating device ( 8th ) for a household appliance ( 1 ), with a control element ( 10 ), which is mounted on a control element holder ( 9 ) of the operating device ( 8th ) controllable household appliance ( 1 ) by magnetic force and relative to the control element recording ( 9 ) is movable and detachably positionable from there, and the operating element ( 10 ) a control base ( 10b ) and a control panel ( 10b ) from above at least partially covering the control element cap ( 10a ), which with the operating element base ( 10b ) and for setting operating conditions of the household appliance ( 1 ) relative to the control element base ( 10b ) is rotatable, characterized in that the control element cap ( 10a ) and the control element socket ( 10b ) are non-destructively releasably connected by means of magnetic holding force. Operating device according to claim 1, characterized in that for axial connection and holding a holding magnet ( 38 ) on the control element cap ( 10a ) and a holding magnet ( 27 ) on the control panel socket ( 10b ) are each centrally located and interact magnetically. Operating device ( 8th ) according to claim 2, characterized in that the holding magnet ( 27 ) in the control panel socket ( 10b ) for magnetic interaction with an external control central magnet ( 12 ) for magnetically holding the entire operating element ( 10 ) on the control element holder ( 9 ) is trained. Operating device ( 8th ) according to claim 1, characterized in that for axial connection and holding a holding magnet ( 38 ) on the control element cap ( 10a ) and a magnetically interacting component, in particular a ferromagnetic element, on the control element base ( 10b ) are arranged. Operating device ( 8th ) according to claim 4, characterized in that the magnetically interacting component in the control element base ( 10b ) with a control element external central magnet ( 12 ) for magnetically holding the entire operating element ( 10 ) on the control element holder ( 9 ) is magnetically coupled. Operating device ( 8th ) according to claim 1, characterized in that a holding magnet ( 27 ) on the control panel socket ( 10b ) and a magnetically interacting component, in particular a ferromagnetic element, on the control cap ( 10a ) are arranged. Operating device ( 8th ) according to claim 6, characterized in that the holding magnet ( 27 ) in the control panel socket ( 10b ) with a control element external magnetically interacting component, in particular a ferromagnetic element, for magnetically holding the entire operating element ( 10 ) on the control element holder ( 9 ) is magnetically coupled. Operating device ( 8th ) according to one of the preceding claims, characterized in that at an im on the control element receptacle ( 9 ) positioned state of the operating element ( 10 ) on the control element holder ( 9 ) facing the underside ( 24a ) of the control element socket ( 10b ) at least one adhesive element ( 42 ) is formed, whose material has a greater frictional resistance than the underside ( 24a ). Operating device ( 8th ) according to one of the preceding claims, characterized in that between the control element base ( 10b ) and the control cap ( 10a ) a recording room ( 39 ) is formed, in which a Drehstellungseinstelleinrichtung ( 43 ) is arranged, the first Drehstellungseinstellmittel ( 44 ) provided on the control element base ( 10b ), and second rotational position adjusting means (14); 45 ) attached to the control cap ( 10a ) are arranged and for setting a rotational position of the control element cap ( 10a ) relative to the control element base ( 10b ) for interacting with the first rotational position setting means ( 44 ) are formed. Operating device ( 8th ) according to claim 9, characterized in that the first Drehstellungseinstellmittel magnets ( 44 ), which are on the as the magnets ( 45 ) formed second Drehstellungseinstellmitteln facing sides have the same magnetic polarity, as the second Drehstellungseinstellmittel representing the magnets ( 45 ) on the magnets ( 44 ) facing sides and / or the Drehstellungseinstelleinrichtung ( 43 ) is configured for the adjustment of a rotational position which can be perceived haptically by a user, in particular by a non-contact interaction of the first and second rotational position setting means ( 44 . 45 ) A rotational position is formed as a haptic perceptible latching. Operating device ( 8th ) according to claim 9 or 10, characterized in that the first rotational position means ( 44 ) in the direction of rotation about an axis of rotation (A) of the control element cap ( 10a ) are arranged and the second Drehstellungseinstellmittel ( 45 ) are arranged in the direction of rotation about the axis of rotation (A), in particular both Drehstellungseinstellmittel ( 44 . 45 ) are each arranged on a circle with the same radius. Operating device ( 8th ) according to claim 11, characterized in that at a set rotational position in the direction of the axis of rotation (A) considered around the axis of rotation (A) circumferentially a second rotary adjusting means ( 45 ) between two first Drehstellungseinstellmitteln ( 44 ) is arranged. Operating device ( 8th ) according to one of claims 9 to 12, characterized in that the number of the first Drehstellungseinstellmittel ( 44 ) greater than the number of second rotational position setting means ( 45 ), in particular on the control element cap ( 10a ) two or four second Drehstellungseinstellmittel ( 45 ) and on the control element base ( 10b ) at least 8th , in particular at least 10 first rotational position adjustment means ( 44 ) are arranged. Operating device ( 8th ) according to one of the preceding claims, characterized in that it comprises an infrared transceiver device ( 17 ) for selecting a functional subunit ( 3 to 7 ) of the household appliance ( 1 ), which are connected to transceiver units ( 18 ) Control external to the control panel ( 10b ) is arranged and for detection by a permeable for at least infrared signals ground ( 24 ) of the control element socket ( 10b ) is trained. Household appliance ( 1 ) for preparing food, in particular cooktop ( 1 ), with an operating device ( 8th ) according to any one of the preceding claims.

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