EP1917481A1

EP1917481A1 - Cooking appliance

Info

Publication number: EP1917481A1
Application number: EP06792568A
Authority: EP
Inventors: Maximilian Neuhauser; Klemens Roch; Wolfgang Schnell; Günter ZSCHAU; Edmund Kuttalek; Martin Keller; Wolfgang Fuchs; Ingo Bally; Kerstin Feldmann
Original assignee: BSH Bosch und Siemens Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2005-08-17
Filing date: 2006-07-26
Publication date: 2008-05-07
Anticipated expiration: 2026-07-26
Also published as: US20090229475A1; EP1917481B1; ES2745809T3; WO2007020159A1; DE102005038881A1; PL1917481T3

Abstract

Disclosed is a cooking appliance comprising at least one muffle (5) which delimits a cooking chamber (3) and whose muffle aperture is surrounded by a muffle frame, a door (7) for closing the muffle aperture, said door being movable by means of a driving device (9, 10), and a control circuit (13) for triggering the driving device. The door can be moved only when at least one clearing safety signal is provided.

Description

Cooking appliance

The present invention relates to a cooking appliance, in particular a high-installation cooking appliance, with at least one muffle delimiting a cooking chamber with a muffle opening, a movable door by means of a drive device for closing the muffle opening and a control circuit for driving the drive device.

So far, high-installation cooking appliances are known in which a bottom door is moved by pressing a corresponding movement button in the desired direction.

For example, from DE 101 64 239 A1 a generic high-installation cooking appliance is known in which a control device controls the method of a bottom door.

The disadvantage is that such a simple movement control of the door provides no protection against a malfunction of the control device and except for the Einklemmfall also provides no further protective measures for the operator.

It is therefore the object of the present invention to provide a cooking appliance, in particular a Hocheinbaugargerät with improved reliability in the process of the bottom door.

The present object is achieved by the cooking appliance with the features of claim 1 and a method according to claim 18.

For this purpose, the cooking appliance, which may be in particular a high-installation cooking appliance, but also a cooking appliance with a baking tray, constructed so that the door is movable only if at least one safety signal is present, so a signal that activates specific functionality hardware or software. Without the presence of the safety signal, no movement of the door is possible even if the travel switches are operated correctly. The safety signal is usually issued defined by at least one processor unit, typically a microcontroller, which is possible only when the device electronics or the electronics used to move the door is in a proper state. Also, compliance with other safety conditions can be implemented by the safety signal.

For improved protection against an unwanted procedure, the door can conveniently be moved only if two safety signals are present together. It is particularly advantageous if at least one of the safety signals is only present or is generated when a temperature of the closed cooking chamber is below a temperature threshold, especially if the temperature threshold value 600 ⁰ F or 425 ⁰ C. In this way it can be prevented that a user burns himself at a too hot oven part or a too hot food. It is equally advantageous if, in addition or alternatively, at least one of the safety signals is only present if a child safety device is not activated. This can prevent an unwanted procedure by children.

It is also advantageous if the security signals are pulsed signals, in particular square-wave signals, since this ensures the correct function when microcontrollers are used.

It is also advantageous if, in addition, a voltage supply of the drive device can be switched on by one of the safety signals, since this results in a dual safety function (switching on / activating the drive device).

It is advantageous for a secure and flexible construction if the control circuit comprises at least one lift circuit board for actuating the drive device and a control circuit board for controlling, switching and / or regulating the lift circuit board.

Then, advantageously, a first, internal safety signal is generated by the lift board and a second, external safety signal is generated by the control board. The internal safety signal is preferably applied by the lift board in response to a travel signal S3, e.g. B. an operation of a traversing panel 25, 26 or a movement command of a program automatic generated. The external safety signal is conveniently generated by the control board only on request of the lift board. The control board is preferably connected to a temperature sensor for monitoring a temperature of the cooking chamber and / or a child safety device, so as to control the corresponding activatability / deactivability of the external safety signal. For this purpose, a hardware-implemented circuit for deactivating the external security signal is favorably available, which is switchable in particular by signals of the temperature sensor and / or the child safety device, z. B. by means of a safety relay. However, the activability / deactivability can also be ensured by a computer program product for deactivating the external security signal, which is likewise controllable, in particular, by signals from the temperature sensor and / or the child safety device. It is also advantageous if the drive device comprises a drive motor which can be activated by directional relays, which in turn can be switched by at least one transistor, since transistors can be switched by control signals in a particularly simple, fast and cost-effective manner.

A typical use case involves the following steps:

(A) generating a starting signal, in particular by actuating at least one

Verfahrschaltfeldes; (b) receiving the start signal on the lift board;

(c) generating an internal safety signal on the lift board;

(d) requesting an external safety signal from the control board by the lift board;

(e) generating an external safety signal on the control board if no lock is present;

(f) if there is no lock, outputting the external safety signal to the lift board and to a power supply of the drive device;

(g) Operating the drive device in the desired direction through the lift board as long as both the internal security signal and the external security signal are present.

For ease of operation, the drive device is advantageously operable by operating both traversing panels even when the main switch is turned off.

The invention will be described in more detail below with reference to the attached schematic figures. Show it:

1 is a perspective view of a mounted on a wall Hoch- built-in appliance with lowered bottom door. 2 is a perspective view of the high-Einhaugargeräts with closed bottom door.

3 is a perspective view of a housing of the Hoch-Einbaugargeräts without the bottom door. 4 shows a schematic side view in a sectional view along the line I-I from FIG. 1 of the wall mounted high-mounted cooking appliance with lowered bottom door;

5 shows a front view of another embodiment of a high-installation cooking appliance; Fig. 6 schematically shows a structure of a control circuit relating to a method of the floor door.

1 shows a high-installation cooking appliance with a housing 1 is shown. The back of the housing 1 is mounted on a wall 2 in the manner of a hanging cabinet. In the housing 1, a cooking chamber 3 is defined, which can be controlled via a front side in the housing 1 introduced viewing window 4. 4, it can be seen that the cooking chamber 3 is delimited by a muffle 5, which is provided with a heat-insulating jacket, not shown, and that the muffle 5 has a bottom-side muffle opening 6. The muffle opening 6 is closable with a bottom door 7. In Fig. 1, the bottom door 7 is shown lowered, being with its underside in contact with a worktop 8 a kitchen device. In order to close the cooking chamber 3, the bottom door 7 is in the position shown in FIG. 2, the so-called. "Zero position" to adjust. To adjust the bottom door 7, the Hoch-Einbaugargerät a drive device 9, 10 on. The drive device 9, 10 has a drive motor 9 shown in dashed lines in FIGS. 1, 2 and 4, which is arranged between the muffle 5 and an outer wall of the housing 1. The drive motor 9 is arranged in the region of the rear side of the housing 1 and is, as shown in FIGS. 1 or 4, in operative connection with a pair of lifting elements 10, which are connected to the bottom door 7. 4, each lifting element 10 is configured as an L-shaped carrier whose vertical leg extends from the drive motor 9 on the housing side To adjust the bottom door 7, the drive motor 9 can be actuated by means of a control panel 12 and a control circuit 13, which is arranged according to FIGS. 1 and 2 at the front of the bottom door 7. As shown in Fig. 4, the control circuit 13 is located behind the control panel 12 within the bottom door 7. The control circuit 13, which is composed here of several spatially and functionally separated and communicating via a communication bus circuit boards, provides a central control unit for the Device operation is and controls and / or controls z. As a heating, a method of the bottom door 3, a conversion of user input, lighting, a pinch protection, clocking the radiator 16, 17, 18, 22 and much more.

FIG. 1 shows that an upper side of the bottom door 7 has a hob 15. Almost the entire surface of the hob 15 is occupied by radiators 16, 17, 18, which are indicated in phantom in Fig. 1. In Fig. 1, the radiator 16, 17 are two spaced apart, different sized cooking surface heaters, while the radiator 18 is provided between the two cooking area heaters 16,17 surfaces radiator, the heating elements 16, 17 almost encloses. The Hotplate heaters 16, 17 define cooking zones or hobs associated with the user; the hotplates radiator 16, 17 together with the surface heater 18 define a bottom heat zone. The zones may be indicated by a suitable decoration on the surface. The radiators 16, 17, 18 can each be actuated via the control circuit 13.

In the exemplary embodiment shown, the radiators 16, 17, 18 are configured as radiant heaters, which are covered by a glass ceramic plate 19. The glass ceramic plate 19 has approximately the dimensions of the top of the bottom door 7. The glass ceramic plate 19 is further equipped with mounting holes (not shown) through the base for holding support members 20 for Gargutträger 21 protrude, as shown in Fig. 4. Instead of a glass ceramic plate 19, other - preferably quick-responding - covers can be used, for. B. a thin sheet.

With the help of a provided in the control panel 12 control knob, the Hocheinbau- cooking appliance can be switched to a cooking or a bottom heat mode, which will be explained below.

In the hob mode, the cooking surface heaters 16, 17 by means of control elements 11, which are provided in the control panel 12, are individually controlled via the control circuit 13, while the surface heating element 18 remains out of operation. The hotplate mode is executable with the bottom door 7 lowered, as shown in FIG. But it can also be operated with closed cooking chamber 3 with raised floor door 7 in an energy saving function.

In the lower heat mode of the control device 13 not only the hotplate heaters 16, 17 but also the surface radiator 18 are driven.

In order to achieve as uniform a tanning image of the cooking product as possible during the bottom heating operation, it is crucial that the cooking surface 15 providing the bottom heat has a uniform distribution of the heat output over the surface of the hob 15, although the heating elements 16, 17, 18 have different nominal powers. Preferably, therefore, the radiators 16, 17, 18 are not switched by the control circuit 13 to a continuous operation, but the power supply to the radiators 16, 17, 18 is clocked. The different sized nominal heating powers of the radiator 16, 17, 18 are individually reduced so that the radiators 16, 17, 18 provide a uniform over the surface of the hob 15 distribution of the heat output. Fig. 4 shows schematically the position of a fan 23, z. B. for generating circulating air in a hot air operation or for supplying fresh air. In addition, a mounted on an upper side of the muffle 5 Oberhitzeheizkörper 22 is provided, the single-circuit or mehrkreisig, z. B. with an inner and an outer circle, can be executed. Also can - not shown here for clarity - another radiator such as a ring heater between the rear wall of the housing 1 and the muffle be present. By the control circuit 13, the various operating modes, such as, for example, top heat, hot air or Schnellaufheizbetrieb, by a corresponding activation and adjustment of the heating power of the radiator 16, 17, 18, 22, possibly with activation of the fan 23, are set , The adjustment of the heating power can be done by appropriate timing. In addition, the hob 15 can also be designed differently, for. B. with or without roasting zone, as a pure - one or mehrkreisige - warming zone without cooktops and so on. The housing 1 has a seal 24 towards the bottom door 7.

The control panel 12 is arranged mainly at the front of the bottom door 7. There are alternatively other arrangements conceivable, for. B. at the front of the housing 1, divided into different sub-fields and / or partially on side surfaces of the cooking appliance. Further designs are possible. The controls 11 are not limited in their design and can, for. B. z. As control knob, toggle switch, pushbuttons and membrane keys include the display elements 14 include z. B. LED, LCD and / or touchscreen displays.

In Fig. 5 is schematically and not to scale a high-mounted cooking appliance shown from the front, in which the bottom door 7 is open on contact with the worktop 8. The closed state is shown in dashed lines.

In this embodiment, two traversing panels 25 are located on the front side of the fixed housing 1. Each traversing panel 25 comprises two pushbuttons, namely an upper CLOSE button 25a for a bottom door 7 traveling upwards in the closing direction and a lower OPEN button 25b for a down in opening direction traversing bottom door 7. Without automatic mode (see below) moves the bottom door 7 only by continuous simultaneous pressing the CLOSE buttons 25a both traversing panels 25 upwards, if possible; also moves the bottom door 7 only by continuous simultaneous pressing of the UP buttons 25b both traversing panels 25 down, if possible (manual operation). Since in manual mode an increased operating attention of the user is given and also both hands are used here, an anti-trap is then optional. In an alternative embodiment, traversing panels 26 are mounted on opposite outer sides of the housing 1 with corresponding ZU buttons 26a and UP buttons 26b, as shown in dotted lines.

The dot-dashed control circuit 13, which is located inside the bottom door 7 behind the control panel 12, the drive motor 9 switches so that the bottom door 7 gently anfährt, d. H. not abruptly by simply hiring the drive motor 9, but by means of a defined ramp.

In this exemplary embodiment, the control circuit 13 comprises a memory unit 27 for storing at least one target or travel position PO, P1, P2, PZ of the bottom door 7, preferably with volatile memory modules, eg. B. DRAMs. If a target position PO, P1, P2, PZ is stored, the bottom door can move independently after pressing one of the keys 25a, 25b or 26a, 26b of the traversing panels 25 and 26 in the set direction until the next target position is reached or one of the buttons 25a, 25b or 26a, 26b is pressed again (automatic mode). In this embodiment, the lowest target position PZ corresponds to the maximum opening, the (zero) position PO to the closed state, and P1 and P2 are freely adjustable intermediate positions. If the last target position for one direction has been reached, manual operation must also be continued if this is possible (ie the last end positions do not correspond to a maximum open or closed final state). Analog must then, if for one direction no target position is stored - which z. B. for an upward movement into the closed position would be the case if only PZ is stored, but not PO, P1, P2 - be driven in this direction in manual mode. If no target position is stored, eg. B. in a new installation or after a power disconnection, no automatic mode is possible. If the bottom door 7 is moved in automatic mode, an anti-pinch protection is preferably activated.

Automatic mode and manual operation are not mutually exclusive: by permanently actuating the positioning panel (s) 25, 26, the bottom door 7 also moves in manual mode if a target position could be approached in this direction. It can be z. B. a maximum actuation time of the traversing fields 25 and 26, respectively, of the associated keys 25a, 25b and 26a, 26b, are set to activate the automatic mode, z. B. 0.4 seconds. A target position PO, P1, P2, PZ may be any position of the bottom door 7 between and including the zero position PO and the maximum open position PZ. However, the maximum stored opening position PZ need not be the position with abutment on the work surface 8. Storing the target position PO, P1, P2, PZ can with the bottom door 7 at the desired target position PO, P1, P2, PZ, by means of, for example, lasting several seconds (eg lasting two seconds), pressing a confirmation button 28 in Control panel 12 are performed. Existing optical and / or acoustic signal transmitters which output corresponding signals after storing a target position are not shown for the sake of clarity. A start-up of the desired target position PO, P1, P2, PZ to be set is done, for example, by - in this embodiment - ambidextrous operation of the movement panels 25 and 26 and manual method to this position.

In the memory unit 27, only one or, as shown in this exemplary embodiment, a plurality of target positions PO, P1, P2, PZ can also be storable. In the case of a plurality of target positions PO, P1, P2, PZ, these can be approached successively by actuating the corresponding movement keys 25a, 25b or 26a, 26b. By multiple target positions PO, P1, P2, PZ, the high-installation cooking appliance can be easily adapted to the desired operating height of multiple users. The target position (s) are advantageously erasable and / or overwritten. In one embodiment, for example, only one target position can be stored in the opened state, while the zero position PO is automatically detected and can be automatically approached. Alternatively, the zero position PO must be stored in order to be automatically approachable.

It is particularly advantageous for ergonomic use if the or a target position P1, P2, PZ opens the bottom door 7 at least about 400 mm to about 540 mm (ie P1-PO, P2-P0, PZ-PO> 40cm to 54 cm). In this opening dimension the food supports 21 are easy to insert into the support members 20. It is advantageous if the viewing window 4 is mounted approximately at eye level of the user or slightly below, z. B. by means of a template that indicates the dimensions of the cooking appliance.

Not shown is an existing power failure override for bridging of about 1 to 3 s power failure, preferably to 1, 5 s power failure.

The drive motor 9 from FIG. 1 has at least one sensor unit 31, 32 arranged on a motor shaft 30, possibly in front of or behind a transmission, in order to measure a travel path or a position and / or a speed of the bottom door 7. The sensor unit For example, it may include one or more induction, reverberation, opto, SAW sensors, and so on. Here are for easy distance and speed measurement here two Hall (part) elements 31 offset by 180 ° - ie opposite - attached to the motor shaft 30, and a Hallmeßaufnehmer 32 is fixedly mounted at this area of the motor shaft spaced. If a Hall element 31 then moves past the measuring transducer 32 when the motor shaft 30 rotates, a measuring or sensor signal is generated which is, to a good approximation, digital. With (not necessarily) two Hall elements 31, therefore, two signals are output during one revolution of the motor shaft 30. By time evaluation of these signals, z. B. their time difference, the speed vL of the bottom door 7 can be determined, for example via comparison tables or a conversion in real time in the control circuit 13. By addition or subtraction of the measurement signals, a travel or a position of the bottom door 7 can be determined.

A speed control can realize the speed, for example via a PWM-controlled power semiconductor.

For zero point determination, the distance measurement is automatically readjusted by initialization in the zero position PO of the bottom door 7 at each startup, so z. B. a faulty sensor signal output or -aufnähme not traditional.

The drive motor 9 is operated by actuation of both traversing panels 25 and 26, even when the main switch 29 is turned off.

Instead of two separate switches per travel field 25, 26 is also a single switch per process field possible, for. B. a toggle switch with a neutral position, which switches only under pressure. Other shapes are possible. Also, the nature and arrangement of the controls 28,29 of the control panel 12 is not limited.

The arrangement and distribution of the control circuit 13 is flexible and not limited, so it can also several boards, z. B. include a display board, a control board and an elevator board, which are spatially separated.

A 4 mm opening dimension can be detected by limit switches 33, which deactivate anti-pinch protection when actuated. The high-installation cooking appliance can also be designed without a storage unit 27, in which case no automatic operation is possible. This can be for increased operating safety, eg. B. as protection against pinching, be useful.

6 shows a schematic circuit diagram of the drive circuit 9 connected to the control circuit 13. The control circuit 13 consists of three separate circuit boards or modules, namely an elevator board 34 for directly operating the drive motor 9, a control board 35, inter alia, for switching and / or Rules of the lift board 34 and a display board 36 for controlling the control panel 12, z. B. the display unit 14, and processing and / or forwarding of actuating signals of the operating elements 11. The boards 34-36 are connected to each other for communication via a Dll bus 37; Therefore, the boards 34-36 may also be arranged at different locations in the cooking appliance, z. B. the display board 36 behind the panel 12, the control board 35 in the fixed part of the housing 1 and the lift board 34 in the vicinity of the drive motor. 9

The direction of movement of the drive motor 9 and thus the bottom door 3 is determined by two (not shown here) relays, which are controlled by transistors. If one of the relays is active, the drive motor 9 moves in the assigned direction. If both relays are active - which should normally be prevented - the drive motor blocks 9. If no relay is active, the motor 9 is short-circuited and no movement is possible (idle state). In this embodiment, the motor 9 can only be driven if there are at least two safety signals; ie here, that only then the transistors can be controlled accordingly. A first safety signal is an (internal) safety signal S1 generated by the lift circuit board 34 itself, which, for. B. is generated with correct actuation of the movement or lift function, for example by pressing the traversing switches 25a, 25b, 26a, 26b. The first safety signal S1 ensures that a travel signal is correctly accepted and processed on the lift board 34 - that is, there is no error-related switching of the relay by the lift board 34 - since otherwise the circuit for the safety signal, typically a microcontroller, would not trigger , Thus, this safety signal S1, that the electronics of the lift board basically works correctly. The second safety signal is an (external) safety signal S2 generated by the control board 35, which typically takes into account other states managed by the control board 35, e.g. B a temperature in the closed cooking chamber 3 or an activation of a child safety lock 40. In this embodiment, the external safety signal S2 switches twice: first, the power supply of the relay and secondly together with the internal Safety signal S1 the corresponding transistor. The safety signals S1, S2 are pulse signals ("wiggler signals") which are clocked at 1 KHz in this embodiment, more precisely square-wave signals, which is advantageous since the microcontrollers which are usually present must function properly for this purpose.

A typical sequence of an actuation of the drive motor 9 is as follows: a user wants to open a closed cooking chamber 3, in which a prepared food is located, to remove the food. For this he presses one of the "UP" buttons 25b briefly in the automatic mode, ie shorter than 0.4 seconds. The actuation of the "UP" - button 25b is sensed by the display board 36 and forwarded in this embodiment via the signal bus 37 to the lift board; Alternatively, the actuating signal S3 can be conducted via a direct line to the lift board 34. The lift board 34 detects the correct actuation signal S3, and generates the internal safety signal S1. In addition, the lift board 34 now requests the external security signal S2 via the bus 37 from the control board 35. The control board 35 checks whether a transmission of the external security signal S2 is not precluded by further conditions; it is first checked whether the child safety device 40 is turned off and second, whether a temperature sensor 39 indicates a temperature in the cooking chamber 3, which is less than a temperature threshold of z. B. 425 ⁰ C or 600 ⁰ F. Only if no further conditions are present, the external safety signal S2 is output. In this embodiment, the corresponding transistor and thus the corresponding directional relay via a control line 38 is driven only when both the internal security signal S1 and the external security signal S2 are present. The external safety signal S2 additionally activates the voltage supply of the relays by switching on the transformer 41 for the drive motor 9. Only then can the drive motor 9 be actuated, and the bottom door 3 moves accordingly. The external safety signal S2 thus has a dual safety function. Alternatively, however, the external security signal S2 may also have only one of these functionalities. Before the bottom door 7 is moved, both relays are also checked for their functionality.

One of the temperature sensor 39, z. As a Pt500 or Pt1000 temperature sensor, output temperature reading uses the control board 35, for example, to check whether the cooking chamber 3 is too hot to open. Is the temperature above a certain temperature threshold, z. For example, if 415 ⁰ C or 600 ⁰ F, the rule board 35 does not output an external security signal, and the bottom door 7 does not move (lock). This locking or deactivation of the external safety square signal S2 can be done via a hardware circuit, for. B. so that when exceeding the Temperature threshold a switch necessary for switching the external safety signal S2 forcibly opens or remains open. Alternatively, the locking can also be done programmatically.

The control circuit 13 may also be different or not at all divided, and the nature and arrangement of the interconnection and signal control is of course not limited to the cited embodiment. It can also be used more or less than two security signals, z. B. only safety signal S1 or S2, since even a security signal provides increased reliability in the process. Also, further safety conditions can be observed when moving the door.

LIST OF REFERENCES

1 housing

2 wall

3 cooking space

4 viewing window

5 muffles

6 muffle opening

7 bottom door

8 worktop

9 drive motor

10 lifting element

11 control element

12 control panel

13 control circuit

14 ad elements

15 hob

16 cooktop heaters

17 cooktop heaters

18 surfaces radiator

19 glass ceramic plate

20 mounting part

21 food support

22 top heaters

23 fans

24 seal

25 traversing panel

25a travel switch upwards

25b Travel switch down

26 traversing panel

26a Travel switch upwards

26b Travel switch down

27 storage unit

28 confirmation button

29 main switch

30 motor shaft

31 Hall element 32 transducers

33 limit switch

34 lift board

35 control board

36 Display board

37 bus line

38 control line

39 temperature sensor

40 child safety lock

41 transformer

FT1 first time-force profile

FT2 second force time profile

PO zero position

P1 intermediate position

P2 intermediate position

PZ end position

R1 speed ramp

R2 speed ramp

S1 internal safety signal

S2 external safety signal

S3 travel signal vL Travel speed of the bottom door

Claims

claims

1. Cooking appliance, with at least one cooking chamber (3) delimiting muffle (5) with a muffle opening (6), - a by means of a drive device (9,10) movable door (7) for closing the muffle opening (6) and a control circuit ( 13) for activating the drive device (9, 10), characterized in that the door (7) can only be moved if at least one safety signal (S1.S2) activating the method is present.

2. Cooking appliance according to claim 1, characterized in that the door (7) is only movable when two safety signals (S1.S2) are present.

3. Cooking appliance according to claim 1 or 2, characterized in that at least one of the safety signals (S1, S2) is present only when a temperature of the closed cooking chamber (3) is below a temperature threshold.

4. Cooking appliance according to claim 3, characterized in that the temperature threshold is 600 ⁰ F or 425 ⁰ C.

5. Cooking appliance according to one of the preceding claims, characterized in that at least one of the safety signals (S1, S2) is present only if a child safety device (40) is not activated.

6. Cooking appliance according to one of the preceding claims, characterized in that the safety signals (S1, S2) are pulsed signals, in particular rectangular signals.

7. Cooking appliance according to one of the preceding claims, characterized in that by one of the safety signals, a power supply (38) of a drive motor (9) of the drive device (9,10) is switched on.

8. Cooking appliance according to one of the preceding claims, characterized in that the control circuit (13) at least one lift circuit board (34) for actuating a drive motor (9) of the drive device (9,10) and a control board (35) for switching and / or rules of the lift board (34).

9. cooking appliance according to claim 8, characterized in that by the lift board (34) a first, internal safety signal (S1) and by the control board (35) a second, external safety signal (S2) is generated.

10. cooking appliance according to claim 8, characterized in that the internal safety signal (S1) by the lift board (34) in response to a Verfahrsignal (S3) can be generated.

11. Cooking appliance according to claim 9 or 10, characterized in that the external safety signal (S2) by the control board (35) on request of the lift board (34) can be generated.

12. Cooking appliance according to one of claims 9 to 11, characterized in that the control board (35) with a temperature sensor (39) for monitoring a temperature of the cooking chamber (3) and / or a child safety device (40) is connected.

13. Cooking appliance according to claim 12, characterized in that a circuit for deactivating the external safety signal (S2) is present, which in particular by signals of the temperature sensor (39) and / or the child safety device (40) is switchable.

14. cooking appliance according to claim 12, characterized in that a computer program product for deactivating the external security signal (S2) is present, which in particular by signals of the temperature sensor (39) and / or the child safety device (40) is controllable.

15. Cooking appliance according to one of the preceding claims, characterized in that the drive device (9,10) comprises a drive motor (9) which can be activated by directional relays, which in turn are switchable by at least one transistor.

16. Cooking appliance according to one of the preceding claims, characterized in that the boards (34-36) by means of at least one bus line (37) can communicate with each other.

17. Cooking appliance according to one of the preceding claims, which is in the form of a high-installation cooking appliance, characterized in that the muffle opening is a bottom-side muffle opening (6) and the door is a bottom door (7).

18. A method for operating a high-installation cooking appliance according to one of the preceding claims, characterized in that it comprises the following steps:

(A) generating a starting signal (S3), in particular by actuating at least one traversing panel (25,26);

(b) receiving the start signal (S3) at the lift board (34);

(c) generating an internal security signal on the lift board (34);

(d) requesting an external safety signal from the control board (35) by the lift board (34); (e) generating an external safety signal (S2) on the control board, if none

Lock is present;

(f) if there is no interlock, outputting the external safety signal (S2) to the lift board (34) and to a power supply (38) of the drive device (9, 10); (g) operating the drive device (9, 10) in the desired direction through the lift board (34) as long as both the internal security signal (S1) and the external security signal (S2) are present.