WO2007033919A1

WO2007033919A1 - Cooking appliance

Info

Publication number: WO2007033919A1
Application number: PCT/EP2006/066285
Authority: WO
Inventors: Ingo Bally; Kerstin Feldmann; Wolfgang Fuchs; Martin Keller; Edmund Kuttalek; Maximilian Neuhauser; Klemens Roch; Wolfgang Schnell; Günter ZSCHAU
Original assignee: BSH Bosch und Siemens Hausgeräte GmbH
Priority date: 2005-09-19
Filing date: 2006-09-12
Publication date: 2007-03-29
Also published as: US20090320821A1; DE102005044695A1; RU2008113528A; EP1929213A1

Abstract

The invention relates to a cooking appliance, in particular, a cooking appliance which is mounted in an elevated manner. Said cooking appliance comprises at least one muffle which is defined by a cooking chamber and which comprises a muffle opening, a door which is used to close the muffle opening and a drive motor which is used to displace the door. The drive motor is equipped with a self-locking transmission.

Description

Cooking appliance

The present invention relates to a cooking appliance, in particular a Hocheinbau- cooking appliance, with at least one a cooking space delimiting muffle with muffle opening, a door to close the muffle opening and a drive motor for moving the door.

As a locking device for cooking appliances with motorized door locking hooks are previously known. These locking hooks disadvantageously require space.

It is the object of the present invention to provide a cooking appliance with a possibility for secure and compact locking of the door.

The present object is achieved by the cooking appliance having the features of patent claim 1. Advantageous embodiments are the dependent claims individually or in combination removed.

For this purpose, the cooking appliance, in particular a high-installation cooking appliance, but also a cooking appliance with a motor-driven baking tray, equipped with a drive motor with a self-locking gear. Due to the self-locking gear mechanism, a mechanical mounting of the door against the engine can be made more difficult in the closed state of the door so that an opening of the door can be reliably prevented.

Advantageously, the self-locking gear is a worm gear.

It has been found to be particularly favorable for a Hocheinbaugargerät when the self-locking gear has a gear ratio in the range of 30: 1 to 60: 1, in particular in the range of 40: 1 to 50: 1, especially from 45: 1. The bottom door of a Hocheinbaugargerätes did not act at a 45-gear ratio even with a load of more than 20 kg.

It is advantageous for self-locking when the drive motor is short-circuited in the closed state, since an opening force must then be expended against the self-induction of the motor. The invention will be described in more detail below with reference to the embodiments shown in 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 in front view, the embodiment of Figure 5 in the closed state with a more detailed description of the location of individual housing elements. Fig. 7 is a plan view in section of the embodiment of Fig. 6; Fig. 8 for a more detailed description parts of the drive device; 9 is a side view similar to FIG. 4 is a view of another embodiment of the high-installation cooking appliance;

10 shows the embodiment of the cooking appliance according to FIG. 9 in a front view in a sectional view;

11 shows a detail from FIG. 10 in greater detail;

Fig. 12 shows another embodiment of the high-installation cooking appliance with emergency opening arrangement in Fig. 7 analog representation.

The figures are not drawn to scale to better illustrate the individual elements.

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. In FIG. 4 it can be seen that the cooking space 3 is delimited by a muffle 5, which is provided with a heat-insulating sheath, 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, wherein they with its underside in abutment with a countertop 8 of a kitchen appliance. 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 designed as an L-shaped carrier, whose vertical leg extends from the housing-side drive motor 9 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 separate and communicating via a communication bus circuit boards, is a central control unit for the device operation and controls and / or regulates z. As a heating, a method of the bottom door 3, a conversion of user input, a lighting, a pinch protection, a clocking of 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 hob, while the radiator 18 is provided between the two cooking area heaters 16,17 surface heating element, which almost encloses the cooking area heaters 16, 17. The hotplate heaters 16, 17 define for the user associated cooking zones or hobs; the hotplate heaters 16, 17 together with the surface heating element 18 define a bottom heat zone. The zones may be indicated by a suitable decoration on the surface. The radiators 16, 17, 18 are each controlled 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 control panel 12 provided in the control knob, the high-installation 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 can be controlled individually by means of control elements 11, which are provided in the control panel 12, 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, not only the hotplate heaters 16, 17 but also the surface heating element 18 are activated by the control device 13.

In order to achieve the most uniform possible tanning image of the food during the bottom heat, 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. 3 shows schematically the position of a circulating air pot 23 with a circulating air motor and an associated ring radiator, z. B. for generating hot air circulation in a hot air operation. The open to the cooking chamber 3 Umlufttopf 23 is separated from this typically by a baffle (not shown). 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. By the control circuit 13, the various operating modes, such as, for example, top heat, hot air or Schnellaufheizbetrieb, by an appropriate 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 one Without automatic operation (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 manual operation gives the user more user-friendliness and, moreover, both hands are used, a then only 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 be achieved with the bottom door 7 at the desired target position PO, P1, P2, PZ, by means of, for example, several seconds (eg two seconds), pressing a confirmation key 28 in FIG 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 embodiment, a plurality of target positions PO, P1, P2, PZ can be einspeicherbar. 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-P0, 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 to bridge 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. For example, the sensor unit may include one or more induction, reverberation, opto, SAW sensors, and so forth. 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 measured 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 traversing field 25, 26 and a single switch per traversing field is 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 be 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.

Fig. 6 shows schematically (not to scale) indicated from the front, the position of individual elements of the housing 1 in the closed state, in which the bottom door 7 on the muffle 5 final touches and thereby the housing 1 visually terminates. The housing 1 consists of an (inner) housing body

34 (dashed lines) and a housing cover or panel 35 which surrounds the housing body 34 at least front and side. The gap 36 between the housing body 34 and housing cover 35 is designed so that cooling air can flow at least partially. These are in the housing cover 35 lower ventilation openings 37, z. As ventilation slots provided, which are mounted lower than the upper surface 38 of the housing body 34, preferably in an area in the vicinity of the muffle opening or the lift floor 7. The ventilation openings 37 are here at the bottom of the housing cover

35 introduced; but can also be present for example laterally. Accordingly, there are one or more upper vents 39, z. B. a vent slot in the upper part of the housing cover 35, especially in the ceiling. Thereby, an air flow of cooling air through the gap 36 can be constructed, typically from bottom to top, which is then discharged through the ceiling.

In the housing body 34, the muffle 5 (dotted drawn) is introduced, the associated space 40 - is lined - with the exception of the front - with insulating material. The muffle 5 is conversely configured U-shaped. In order to look into the cooking chamber 3, a plurality of viewing windows 4 are present, namely a muffle 5 directly covering the first (inner) window 41 (dash-dotted lines), which therefore at least partially represents a wall of the muffle 5, further through the housing body 34th held second (middle) window 42 (also indicated by dash-dotted lines) and a third (outer) viewing window 43 in the housing cover 35th Optionally, additional intermediate windows can be drawn in (not shown), which are preferably fastened to the housing body 34, or fewer viewing windows 4 may be present, eg. B. only the inner and outer windows 41, 43. From, for example, the ventilation slots 37, 39 may be introduced in a different arrangement and shape.

Fig. 7 shows a plan view of the housing 1 corresponding to the cutting surface Ill-Ill of Fig. 6 (ie without upper housing wall) a more detailed, not to scale view of the housing interior with different elements arranged therein. From this point of view, the spaces 36 between the housing body 34 and housing cover 35 are clearly visible, namely the lateral spaces 44, the front gap 45 and the rear gap 46. Because of the three viewing windows 41, 42, 43, the front gap 45 is perpendicular to a first front intermediate space 45a between the middle viewing window 42 and outer viewing window 43 and a second front gap 45b between the middle viewing window 42 and inner viewing window 41 divided. Of course, the spaces must not be empty, but may have different elements therein, such as. As lifting elements 10, brackets, bushings, insulation, air guide elements such as baffles, screws, struts, etc., and not every space 36 must allow a significant flow of air.

On the housing body 34 are in particular attached: electrical or electronic assemblies 47 such as the control circuit 13, a drive device 48 and a ventilation device 49th

The ventilation device 49 comprises at least one fan, which in this embodiment is exactly one fan which draws in air from two directions by means of two suction openings. For this purpose, a two-part fan is advantageously used, in which in addition the exhaust air is output at least substantially unmixed. Particularly suitable is the double-radial fan 50 shown here, which has two opposite suction openings and laterally discharges sucked-in air. In this case, the two sucked air flows are discharged substantially laterally parallel to each other.

In the design shown here, an intake opening of the double-radial fan 50 is connected to an intake passage 51, which is the front intermediate space 45 From above at least partially covers and thereby sucks in cooling air from below from the lower vents 37 through the front gap 45. Thereby, the front gap 45 is cooled for improved user safety, which provides a rather low thermal insulation because of the viewing window 4, 41-43.

The other (rear) suction port of the double-radial fan 50 is open. As a result, cooling air is sucked in particular from the lateral interspaces 44 and the rear gap 46 and flows over the upper surface 38 to the fan 50. As a result, the components arranged on the upper surface 38 are also circulated or flowed through and thus cooled. This is particularly advantageous for the electronic modules 47

The exhaust air of the fan 50 passes through an exhaust duct 52 to an overhead air outlet 53 which blows out the air through the vent opening (s) 39 of FIG.

The drive device 48 comprises a motor 9, which is fastened centrally on the surface 38 of the housing body 34 and on which a guide housing 54 rests. Through the guide housing 54 run two guide channels (not shown). The guide housing 54 has a circular recess for insertion of a pinion 55 of the motor 9. The guide channels lead open laterally past the recess, so that located in the guide channels ropes, cables, etc. are brought into engagement with the pinion 55. At the outer openings of the guide channels, so here four openings, guide tubes 56 are mounted, which together with the guide channels form continuous cable channels. The guide tubes 56 extend in this embodiment from the guide housing 54 to the edge of the upper surface 38 in an area above the lifting elements 10 and further beyond the edge down into the lifting elements 10 into it.

In each of the two cable channels runs a pitch cable as a drive cable (not shown). The pitch cable has a bendable metal core and is wrapped in wire. One end of each pitch cable is firmly connected to the bottom door 7, the other is free. Since both pitch cables are on opposite sides in engagement with the pinion 55, they are linearly displaced by rotation of the pinion 55 in opposite directions. The ascending cable drive can be obtained, for example, from WEBASTO, Germany. The guide tubes 56 are elastically deformable, z. B. molded from aluminum injection. At least one load-carrying guide tube 56 (ie, a guide tube 56 which guides a portion of a pitch cable which is fixedly connected to the floor door 7 directly or indirectly, thereby bearing a load on this portion of the pitch cable) rests on a support 57 , The bearing force depends on the size of the load on the pitch cable. In this embodiment, such a support 57 is provided for each load-carrying guide tube 56. The pads 57 are located substantially at the edge of the upper surface 38 of the housing body 34 so that the load deflectable length - the "arm" - of the guide tube 56 becomes large. As a result, the load dependence of the respective guide tube 56 on the support 57 aufgeübt, substantially vertical, force designed as large as possible. The contact force is dependent, for example, on the loading of the base door 7 or placing it on a base or an object. By measuring the contact force, for example, an overload of the bottom door 7 or a pinch protection can be realized.

The length of the guide tubes 56 is of structural design and may be relatively short or may extend to the attachment of the pitch cable to the bottom door 7 (when closed).

To use the support of the pitch cable for load measurement, the use of guide tubes 56, although for reasons of sliding and abrasion advantageous, but not essential. It is also possible to guide the pitch cables - or cables or ropes in general - freely over suitably positioned (eg over the edge of the surface reaching) supports. The requirements are then conveniently carried out accordingly, z. B. made of a suitable hard and / or lubricious material, surface-treated or surface-coated.

Also, the use of a riser drive is not mandatory, but due to the simple design and installation and the precise displacement advantageous. Alternative drives include, for example, those driving a cable drum, etc.

Fig. 8 shows a detailed description of the drive principle in plan view, the guide housing 54 with the adjoining guide tubes 56, which form two separate guide channels, namely - in this illustration - an upper and a lower guide channel. In each of the guide channels 54, 56 runs a pitch cable 58, typically of a length in the order of one meter. The guide channels direct the lead cable 58 to a recess in the guide housing 54, through which a driven by the drive motor gear or pinion 55 is inserted therethrough. The teeth of the pinion 55 are in engagement with the wrapping wire of the respective pitch cable 58, which forms a kind of linear sequence of teeth from the point of view of the pinion 55.

By rotation of the pinion 55 by means of the drive motor - here shown in clockwise direction by the solid arrows - the upper pitch cable 58 is linearly shifted from left to right and the lower cable 58 is shifted to the same extent from right to left, as indicated by the dashed arrows ,

Since the pitch cables 58 are in constant engagement with the pinion 55 and thus permanently coupled to the drive motor, one can also achieve effective locking of the bottom door in the opening direction, for. B. to protect against opening a hot cooking chamber, for example, in the pyrolysis, or with activated child safety. So far, a mechanical lock is used to lock the door, which typically closes the door depending on certain parameters such as a threshold temperature, etc. by means of a locking hook. However, such a locking can be dispensed with if the drive motor, for example, according to reference numeral 9 of Fig. 7, the pinion 55 via a self-locking gear (not shown) drives. If the drive motor is switched off-which is preferably done by power switching off and deactivation of direction switches-a mechanical force and an induction force of the drive motor must be overcome to open the cooking chamber, or generally to move the bottom door. The applied force must be greater, the greater the ratio of the gearbox. For the embodiment shown, a gear ratio in the range of 30: 1 to 60: 1 has proven to be a good compromise between self-locking and travel speed. In particular, a gear ratio in the range of. 40: 1 to 50: 1, especially 45: 1, is suitable. At a ratio of 45, the floor door could not be opened at a load of more than 20 kg. One of several possible embodiments of the transmission is a worm gear. Other types of transmission are known to those skilled in mechanical engineering.

Of course, the gear ratio is not limited to this area, but can by the expert, for example, to the specifications of the drive motor used, the mechanical friction of the operating mechanism 'the bottom door, the type of drive (riser, cable drum, etc.), the weight and the loading of the bottom door etc. be adjusted.

Fig. 9 shows a side view similar to FIG. 4 is a view of another embodiment of the high-installation cooking appliance with a more detailed description of the drive device of FIGS. 7 and 8. The drive motor 9, the guide housing 54, the vent 49 and the electronic assemblies 47 are for better representation not shown. The other side of the cooking appliance has an analog structure.

It can be seen the elastically deformable guide tubes 56 which rest on top of the support 57 and then bent down into the lifting elements 10 lead. From the free openings of the guide tubes 56 exit the slope cable 58, namely a load-bearing on this side portion of a pitch cable 58 (left), via a fastener 59 on the lower telescopic rod 60 of the lifting element 10, and thus indirectly with the bottom door 7, fixed connected is. The other (right) pitch cable 58 has a free end on this side. On the other side of the cooking appliance, the respectively other pitch cable 58 is fastened or free. By operating the drive motor, the pitch cables 58 are linearly displaced as described above and raise or lower the floor door 7 accordingly.

FIG. 10 shows the embodiment of the cooking appliance according to FIG. 9 in a front view in a sectional view onto the sectional plane IV-IV from FIG. 9.

It can be seen that the pitch cables 58 and the guide tubes 56 are deflected on the support 57 from the horizontal to the vertical. On each of the pads 57 a (deflection) force is thus applied through the respective load-bearing portion of the pitch cable 58 via the elastically deformable guide tubes 56, which depends essentially on the load on the load-bearing portion of the Pitch cable 58, including the weight of the bottom door 7 and its load. In this illustration, only the normal components Fn1, Fn2 of the respective deflecting force are plotted.

By measuring the deflecting force, in particular the respective normal force Fn1 or Fn2 on the corresponding support 57, it is possible to detect, for example, an overload of the bottom door 7 or a trapping case.

An overload of the bottom door 7 is measurable, for example, by exceeding a certain threshold load.

A trapping case in the closing direction of movement of the bottom door 7, ie mostly between the bottom door 7 and housing 1, and in the opening direction of the bottom door 7, so mostly between the bottom door 7 and worktop, can be detected, for example, if a difference between Fn1 and Fn2 is greater than one certain set threshold. Alternatively, time differences in the discharge between both sides can be detected.

Fig. 11 shows a detail indicated by the dashed circle in Fig. 10 in greater detail.

Here, the support 57 moves a switching lug 62, which switches a switch 63 on discharge. In this embodiment, only an undershooting or exceeding of a load threshold value can be detected. Possible applications, embodiments and measuring principles are described for example in DE 102 28 140 A1 and DE 101 64 239 A1.

Alternatively, other load-sensing sensors can measure the forces acting on the support 57, in particular, but not only, the normal force Fn. In these cases, further evaluation possibilities can be used to detect the trapping case, such as a change in the speed of the load, which possibly exceeds a certain threshold value or deviates from a setpoint value (eg a traversing speed or speed ramp) and thereby indicates trapping. FIG. 12 shows analogously to the representation of FIG. 7 a further embodiment of the cooking appliance with an emergency opening arrangement for moving the bottom door in the event of a power failure on the cooking appliance or a failure of the drive motor 9.

The drive motor 9 has on a lead-out 64 a gear in the form of a bevel gear 65, which is in operative connection with the motor shaft (not shown). In addition, a fixed, rotatably mounted shaft 66 is present, which carries a gear in the form of a bevel gear 67 at one end. The other end of the shaft 66 is designed and arranged as an engagement unit or area 69 for operation by a user. The shaft 66 is fastened to the housing body 34 by two brackets 68 and also has a retaining element 70 in the form of a spring which, in normal operation, holds the shaft 66 in a position with a retaining force Fr (indicated by the arrow) in which the bevel gear 67 the shaft of the bevel gear 65 of the drive motor 9 is decoupled. The shaft 66 is of hexagonal cross section, so that, for example, simply a control element, for. B. a crank or a hex key, can be placed (not shown). During normal operation, the end formed as engagement unit 69 is hidden behind the front panel or the front housing cover 35.

In emergency mode, when either the drive motor 9 can no longer be actuated via the control panel or the power of the entire device has failed, the bottom door can still be displaced by the emergency opening arrangement. For this purpose, the front panel is first removed in this embodiment, so that the user receives access to the engagement unit 69. The user then puts a crank with a suitable recess on the shaft 66 and pushes the shaft 66 against the retaining spring force Fr with their bevel gear 67 and thus into engagement with the bevel gear 65 of the drive motor 9. By following rotation of the crank of the drive motor. 9 and associated therewith, the pinion 55 and the pitch cables move causing the bottom door 7 to move.

To transition to normal operation, the pressure is taken from the shaft 66, the crank removed and the front panel replaced.

The toothed or bevel gear 65 may be attached directly to the motor shaft. The shaft 66 may also be flexible. The control unit can be firmly connected to the engagement unit 69 or the shaft 66. Also, the emergency opening arrangement can be procured that the wave is not decoupled in normal operation and thus runs along constantly. Apart from a shaft, any other device is suitable which transmits mechanical forces without current, namely from the engagement unit 69 or a control unit to the motor shaft.

LIST OF REFERENCE NUMBERS

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 hotplate radiators

17 hotplate radiators

18 surface heating elements

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 Measuring sensor Limit switch Housing body Housing cover Interspace lower ventilation openings upper surface of the housing body (34) upper ventilation gap first inner window second (middle) window third (outer) window lateral gaps front gap a first front gap b second front gap rear gap electrics and Electronic assemblies Drive system Ventilation device Fan Intake channel Exhaust air duct Air outlet Guide housing Gear Guide tubes Support Pitch cable Lower telescopic pole Riser cable attachment Upper telescopic rod Switch flag Switch Housing branch Gear Shaft 67 gear

68 brackets

69 intervention unit

70 retaining element

Fn1 normal force 1

Fn2 normal force 2

For retention force

PO zero position

P1 intermediate position

P2 intermediate position

PZ end position

Claims

claims

1. cooking appliance, in particular high-installation cooking appliance, with at least one a cooking chamber (3) delimiting muffle (5) with a muffle opening

(6), a door (7) for closing the muffle opening (6) and a drive motor (9) for moving the door (7), characterized in that the drive motor (9) is equipped with a self-locking gear.

2. Cooking appliance according to claim 1, characterized in that the self-locking gear is a worm gear.

3. Cooking appliance according to claim 1 or 2, characterized in that the self-locking gear has a transmission ratio in the range of 30: 1 to 60: 1.

4. Cooking appliance according to claim 3, characterized in that the self-locking gear has a transmission ratio in the range of 40: 1 to 50: 1, in particular of 45: 1, having.

5. Cooking appliance according to one of the preceding claims, characterized in that the drive motor (9) in the closed state of the door (7) is short-circuited.

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