DRIVE DEVICE FOR A DRIVE THROUGH OF A GARDEN APPLIANCE WITH A COOKING COMPARTMENT AND GARDEN APPLIANCE

Description

[0001] The invention relates to a drive device for an extension of a cooking appliance with a cooking chamber of the type mentioned in the preamble of claim 1 and a cooking appliance of the type mentioned in the preamble of claim 10.

[0002] Cooking appliances with a cooking chamber are already known from the prior art in a multitude of embodiments and comprise a housing, a cooking chamber arranged in the housing and bounded by cooking chamber walls, as disclosed in US 3,485,231 A.

[0003] Furthermore, cooking appliances are also known with a cooking chamber door that can be moved back and forth between a closed position and an open position for closing a cooking chamber opening in the closed position of the cooking chamber door and for accessing the cooking chamber via the cooking chamber opening in the open position of the cooking chamber door.

[0004] There are also cooking appliances with a pull-out shelf arranged on at least one wall of the cooking chamber for holding a separate accessory for the cooking appliance to hold food being cooked. The pull-out shelf can be manually moved back and forth between a recessed position, in which it is completely enclosed in the cooking chamber, and a fully extended position, in which it is at least partially extended from the cooking chamber. Furthermore, embodiments of such cooking appliances are also known in which the cooking appliance has a drive device for automatically driving the pull-out shelf. For example, publications EP 0 521 251 A1 and EP 1 248 046 A2 show such a drive device in the form of an electric motor. This significantly improves the ease of use for a user of the cooking appliance according to the invention.Furthermore, this significantly reduces the risk of injury to the user of the cooking appliance according to the invention, since, for example, unlike with manual operation of the pull-out mechanism, the user does not come into unwanted contact with hot surfaces of the cooking appliance.

[0005] The publication EP 2 716 978 A2 discloses an extension which is mechanically coupled to the oven door, wherein a pivoting movement of the oven door can be transferred to the extension via a coupling device and the extension can be moved automatically depending on the movement of the oven door.

[0006] The invention thus addresses the problem of improving a drive device for an extension of a cooking appliance and a cooking appliance with an extension.

[0007] According to the invention, this problem is solved by a drive device for a pull-out drawer of a cooking appliance with the features of claim 1, characterized in that the drive device comprises an overload protection device to protect the drive device from damage caused by improper operation of the cooking chamber door and / or the pull-out drawer, wherein the overload protection device is designed as a slip clutch with a first contact surface and a second contact surface which is force-transmitting to the first contact surface in the non-overload case, and wherein the two aforementioned contact surfaces are each designed as a friction surface and / or as a positive locking surface, and wherein the overload protection device is designed such thatthat a contact force between the first contact surface and the second contact surface can be manually adjusted from any part of the cooking appliance by means of an adjusting element of the overload protection device, without any disassembly of the drive device. Furthermore, this problem is solved by a cooking appliance with the features of claim 10. Advantageous embodiments and further developments of the invention are set forth in the following dependent claims.

[0008] The advantage achievable with the invention lies particularly in the fact that a drive device for a pull-out drawer of a cooking appliance and a cooking appliance with a pull-out drawer are improved. The overload protection device according to the invention effectively protects the drive device from damage caused by improper operation of the cooking chamber door and / or the pull-out drawer. Such a situation can occur, for example, if food that is too heavy has been placed on the separate accessory held by the pull-out drawer, if the cooking chamber door is moved at too high a speed, if the pull-out drawer is moved manually in an incorrect manner, or if a separate accessory, such as the separate accessory held by the pull-out drawer, is not positioned correctly.Furthermore, the overload protection device makes it possible to design and manufacture the individual components of the cooking appliance according to the invention that are relevant for the automatic movement of the extension in a more material-efficient manner. It is also possible to manufacture the aforementioned components with larger tolerances and thus more cost-effectively. Thus, the aforementioned readjustment of the overload protection device simplifies assembly during the manufacture of the cooking appliance according to the invention, which is equipped with the drive device according to the invention. This is because the readjustment capability allows, for example, component and assembly tolerances to be easily compensated for. Moreover, the design of the overload protection device according to the invention allows for on-site readjustment of the overload protection device for the drive device, even after commissioning at the end customer's site.Such readjustment may be necessary, for example, if the contact force acting between the first and second contact surfaces falls below a minimum threshold required for the proper functioning of the overload protection device due to wear and tear. The term "drive rod" is to be interpreted generally here and also includes, for example, rail-like or plate-like designs.

[0009] In principle, the drive device and the cooking appliance according to the invention can be freely selected within wide suitable limits with regard to type, function, material, and dimensions. For example, the cooking appliance according to the invention can be an oven or another cooking appliance with a cooking chamber. By way of example, reference is made here only to steam cookers, microwave ovens, or combination cookers, i.e., cooking appliances with different heating methods. Similarly, the design of the separate accessory part of the cooking appliance held on the extension is also freely selectable within wide suitable limits. For example, the separate accessory part can be a baking tray or a grill rack. Furthermore, the cooking appliance according to the invention can be designed as a household appliance or as a commercial cooking appliance, i.e., a cooking appliance for professional use.The pull-out drawer can also be designed as a so-called full-extension drawer, which, in its extended position, is completely pulled out of the cooking chamber of the cooking appliance. In this case, access to the drawer, a separate accessory placed on the drawer, or the food being cooked is further facilitated. With multiple shelf levels in the cooking appliance according to the invention, the pull-out drawer can, in principle, be positioned in any of the shelf levels. Furthermore, the cooking appliance according to the invention is suitable and advantageously usable for all conceivable sizes of cooking appliances with a cooking chamber.It is particularly advantageous if the drive device is designed such that the automatic movement of the drawer slide occurs, on the one hand, between its insertion position and its extension position, by means of the drive device, depending on the movement of the oven door between its closed and open positions, and / or, on the other hand, between its extension position and its insertion position, by means of the drive device, depending on the movement of the oven door between its open and closed positions. This is because it ensures that a collision between the drawer slide and the oven door is effectively prevented during both automatic and automatic or manual movement of the oven door.

[0010] A particularly advantageous embodiment of the drive device according to the invention provides that the overload protection device is designed such that the aforementioned readjustment can be carried out by manipulating only a single readjusting element of the overload protection device. In this way, the aforementioned readjustment of the overload protection device is significantly simplified.

[0011] A further advantageous embodiment of the drive device according to the invention provides that the overload protection device is essentially arranged in and mounted on an overload protection housing, wherein the overload protection housing can be detachably or permanently connected to a housing of the cooking appliance. This effectively protects the overload protection device from environmental influences that could impair its function. Furthermore, the overload protection device can be handled essentially as a single unit, thus further simplifying the manufacture of the drive device according to the invention and the cooking appliance equipped with it.

[0012] A drive device according to the invention provides that the drive device has a drive fork with a first contact surface, which can be coupled to a hinge of the oven door in a force-transmitting manner, and a toothed disc with a second contact surface, which is coupled directly or indirectly to the extension in a force-transmitting manner. The toothed disc and the drive fork are mounted on a common bearing shaft of the drive device in a torque-transmitting manner and can be preloaded against each other by means of a spring of the overload protection device and the adjusting element. Preferably, a friction and / or positive locking lining having the first contact surface or the second contact surface is arranged on the drive fork or on the toothed disc in a rotationally secure manner. In this way, the drive device according to the invention can be implemented in a particularly simple and robust manner in terms of design and manufacturing.Furthermore, in the present embodiment of the drive device according to the invention, an electric motor and its signal-transmitting and energy-transmitting connection to a control unit of the cooking appliance are unnecessary. The drive device according to the invention for the automatic drive of the extension according to this embodiment can be implemented using purely mechanical means. The preferred embodiment of this embodiment also has the further advantage that, for example, the coefficient of friction between the first and second contact surfaces can be easily adjusted by means of the friction and / or positive-locking coating. Moreover, it is possible, for example, to adjust the aforementioned coefficient of friction independently of the drive fork or the toothed disc by means of the friction and / or positive-locking coating, so that there is greater freedom in the choice of material for the aforementioned component of the drive device.

[0013] An advantageous further development of the aforementioned further development of the drive device according to the invention, referring back to claim 3, provides that the bearing shaft is mounted with a first end of the bearing shaft and a first bearing element of the drive device on a side of the overload protection housing facing the cooking chamber of the cooking appliance and with a second end of the bearing shaft and a second bearing element of the drive device on a side of the overload protection housing opposite the aforementioned side, wherein the first and the second bearing elements are designed to reduce friction compared to a direct mounting of the bearing shaft on the overload protection housing, preferably that the second bearing element is designed to connect the drive fork to the bearing shaft in a positive-locking manner, particularly preferably that the bearing shaft has a contour that engages positively with the second bearing element and with the toothed disc.This significantly reduces friction between the bearing shaft and the overload protection housing. Furthermore, the preferred and especially the particularly preferred embodiment of this improved design allows for a further simplified construction and assembly, as well as savings in components and material.

[0014] An advantageous further development of the latter embodiment of the drive device according to the invention provides that the bearing shaft has an external thread at its second end and the adjusting element is designed as an adjusting nut with an internal thread corresponding to the external thread. In this way, the adjusting element and its operative connection with the remainder of the overload protection device are realized in a particularly simple manner from a design and manufacturing perspective.

[0015] An advantageous embodiment of the drive device according to any one of claims 4 to 6 provides that the toothed disc and the drive fork are arranged between the spring and the adjusting element, preferably that the spring is designed as at least one disc spring. This enables a particularly compact and reliable arrangement of the toothed disc and the drive fork of the drive device according to the invention. The preferred embodiment of this embodiment also has the further advantage that the spring, due to the at least one disc spring, can be designed to be very compact on the one hand and very flexible on the other, for example by a suitable series and / or parallel connection of individual disc springs in the case of a plurality of disc springs.

[0016] A further advantageous embodiment of the drive device according to the invention provides that the overload protection device is designed such that it compensates for both incorrect operation of the extension towards its retracted position and incorrect operation of the extension towards its extended position. In this way, the protection of the drive device against overload is further improved.

[0017] Furthermore, an advantageous embodiment of the drive device according to the invention provides that the overload protection device is arranged on the housing of the cooking appliance by means of the drive device in such a way that the adjusting element is directly accessible from the outside. This further simplifies access to the adjusting element for readjusting the contact force between the first and second contact surfaces of the overload protection device. For example, it is thus unnecessary to first remove a cover or the like that conceals the adjusting element.

[0018] An advantageous embodiment of the cooking appliance according to the invention provides that the drive device comprises a drive unit arranged outside the cooking chamber and mechanically coupled to a hinge of the cooking chamber door for generating torque, a drive shaft connected to the drive unit for torque transmission and passing substantially tightly through one of the cooking chamber walls, and a drive rod connected to the drive shaft for torque transmission and to the extension for force transmission, wherein the overload protection device is designed as an integral component of the drive unit. Due to the arrangement of the drive unit outside the cooking chamber, the drive device, with the exception of the drive shaft and the drive rod, is located outside the cooking chamber, so that the space available in the cooking chamber is occupied by the drive device only to a very small extent.Accordingly, the volume of the cooking chamber is essentially available for the cooking process. If side racks or the like are arranged in the cooking chamber, a conflict of installation space between the side racks or the like on one side and the drive unit on the other is essentially prevented according to the invention. Thus, existing accessories, such as existing side racks or the like, can be used when equipping the cooking chamber. Adapting the aforementioned accessories to the equipment of the cooking appliance according to the invention with the drive unit is therefore not necessary.

[0019] An embodiment of the invention is shown purely schematically in the drawings and is described in more detail below. It shows Figure 1 shows an embodiment of the cooking appliance according to the invention with the drive device according to the invention in a partial frontal view, with the cooking chamber door in its open position; Figure 2 shows the embodiment in a partial detailed view in the area of ​​the extension, with the extension being moved into its extended position with the cooking chamber door at a 75° angle, in a perspective view; Figure 3 shows the embodiment according to the Fig. 2 Figure 4 shows a partial top view and the embodiment in an enlarged and 180° rotated detail view in the area of ​​the overload protection device, in a partial, cutaway side view.

[0020] In the Fig. 1 bis 4 An embodiment of the cooking appliance according to the invention, including the drive device according to the invention, is shown purely by way of example.

[0021] The cooking appliance 2 is designed as a household oven and comprises a housing 4, a cooking chamber 16 arranged in the housing 4 and bounded by cooking chamber walls 6, 8, 10, 12, 14, a cooking chamber door 18 that can be moved back and forth between a closed position and an open position for closing a cooking chamber opening 20 of the cooking chamber 16 in the closed position of the cooking chamber door 18 and for accessing the cooking chamber 16 by means of the cooking chamber opening 20 in the open position of the cooking chamber door 18, and a pull-out section 22 arranged on two opposing cooking chamber side walls 10, 12 of the cooking chamber walls 6 to 14 for holding a separate accessory part of the cooking appliance 2 (not shown) designed as a baking tray for receiving food (also not shown), wherein the pull-out section 22 can be moved between an insertion position in which the pull-out section 22 is completely received in the cooking chamber 16 and a Extension position in which the extension 22 is at least partially extended out of the cooking chamber 16,It can be transferred back and forth. Extract 22 is in the , Fig. 1 not shown.

[0022] Furthermore, the cooking appliance 2 has a drive device 24 for the automatic drive of the extension 22, wherein the drive device 24 has a drive unit 26 arranged outside the cooking chamber 16 for generating a torque, a drive shaft 28 connected to the drive unit 26 in a torque-transmitting manner and passed substantially tightly through the cooking chamber floor 6 of the cooking chamber walls 6 to 14 and a drive rod 30 connected to the drive shaft 28 in a torque-transmitting manner and to the extension 22 in a force-transmitting manner.

[0023] In the present embodiment, the drive unit 26 is thus arranged below the cooking chamber floor 6, with the drive shaft 28 passing through the cooking chamber floor 6.

[0024] Furthermore, the drive unit 26 is designed here as a gearbox mechanically coupled to the oven door 18, namely to a hinge 32 of the oven door 18.

[0025] The drive unit 26, designed as a gearbox, has a pair of gears, wherein one gear 34 of the gear pair is mechanically coupled to the oven door 18, namely to the hinge 32, and the other gear 36 of the gear pair is mechanically coupled to the drive shaft 28. Both gears 34 and 36 each have spur teeth, with gear 34 being designed only as a gear segment, i.e., as a toothed disc.

[0026] The oven door 18, namely the hinge 32, further comprises a coupling bolt 38, and the drive unit 26, which is mechanically coupled to the oven door 18, namely to the hinge 32, has a drive fork 40 designed to correspond to the coupling bolt 38. The coupling bolt 38 and the drive fork 40 are designed and arranged in such a way that the coupling bolt 38 is movable at least partially independently of the drive fork 40 when the oven door 18 is moved from its closed position to its open position and / or from its open position to its closed position. This will be explained in more detail below.

[0027] In the present embodiment, the extension 22 is arranged on the two opposing oven walls 10, 12 of the oven walls 6 to 14. The extension 22 has a left extension rail 42, 44 on one oven wall 10 and a right extension rail 44 on the other oven wall 12 for holding the separate accessory, which are rigidly connected to each other by means of a connecting rail 46. The connecting rail 46 is located at one end of the extension 22, opposite the oven opening 20, on the two extension rails 42, 44, with the drive rod 30 being force-transmittingly connected to the connecting rail 46. For this purpose, the drive rod 30 engages with a cam (not shown) in a cam (also not shown) of the connecting rail 46, transmitting force.

[0028] As from the Fig. 2 and 3As can also be seen, the extension 22 is detachably held by means of the two extension rails 42, 44 on each of the side racks 48, 50 arranged on the associated oven side wall 10, 12. The side racks 48, 50 can be designed such that, in addition to the extension 22, at least one further separate accessory of the cooking appliance 2 (not shown) for holding further food items (not shown), for example, another baking tray or a grill rack, can be held on the two side racks 48, 50.

[0029] According to the invention, the drive device 24 has an overload protection device 60 to protect the drive device 24 from damage caused by improper operation of the oven door 18 and / or the pull-out drawer 22, wherein the overload protection device 60 is designed as a slip clutch with a first contact surface 62 and a second contact surface 64 which is connected to the first contact surface 62 in a force-transmitting manner in the non-overload case, and wherein the two aforementioned contact surfaces 62, 64 are each designed as a friction surface, and wherein the overload protection device 60 is designed such that a contact force between the first contact surface 62 and the second contact surface 64 can be manually adjusted by means of an adjusting element 65 of the overload protection device 60 without any disassembly of the drive device 24 from any part of the cooking appliance 2.The overload protection device 60 is designed here as an integral component of the drive unit 26.

[0030] As will be explained in more detail below, the overload protection device 60 is designed in such a way that the aforementioned adjustment can only be carried out by handling the single adjusting element 65 of the overload protection device 60.

[0031] In the present embodiment, the overload protection device 60 is essentially arranged in an overload protection housing 67 and mounted on the overload protection housing 67, wherein the overload protection housing 67 can be detachably or indetachably connected to the housing 4 of the cooking appliance 2.

[0032] According to the invention, the drive fork 40 has the first contact surface 62 and the toothed disc 34 has the second contact surface 64, wherein the toothed disc 34 and the drive fork 40 are mounted on a common bearing shaft 70 of the drive device 24 in a torque-transmitting manner and can be preloaded against each other by means of a spring 72 of the overload protection device 60 and the adjusting element 65, and wherein, preferably, a friction lining 66 having the first contact surface 62 is arranged on the drive fork 40 in a rotationally secure manner. The toothed disc 34 and the drive fork 40 are arranged between the spring 72, which is designed as a disc spring, and the adjusting element 65.

[0033] The bearing shaft 70 is supported at one end of the bearing shaft 70 and a first bearing element 74 of the drive device 24 on a side 68 of the overload protection housing 67 facing the cooking chamber 16 of the cooking appliance 2, and at the other end of the bearing shaft 70 and a second bearing element 76 of the drive device 24 on a side 69 of the overload protection housing 67 opposite the aforementioned side 68, wherein the first and the second bearing elements 74, 76 are designed to reduce friction compared to a direct support of the bearing shaft 70 on the overload protection housing 67. Furthermore, the second bearing element 76 positively connects the drive fork 40 to the bearing shaft 70, wherein the bearing shaft 70 has a contour that positively engages with the second bearing element 76 and with the toothed disc 34. This contour is crescent-shaped.

[0034] Furthermore, the bearing shaft 70 has an external thread at its second end, and the adjusting element 65 is designed as an adjusting nut with an internal thread corresponding to the external thread. Stops (not shown) on the overload protection housing 67 ensure that the clamping force can only be adjusted by manipulating the single adjusting element 65. This is because rotation of the bearing shaft 70 is effectively prevented when adjusting the clamping force using the aforementioned stops. In addition, the rotation of the second bearing element 76 with the bearing shaft 70 prevents the adjusting element 65, designed as an adjusting nut, from unintentionally loosening from the bearing shaft 70.Due to the fact that the bearing shaft 70 protrudes downwards from the overload protection housing 67 at its second end, it is possible to handle the adjusting element 65 without any disassembly of the drive device 24 from the housing 4 of the cooking appliance 2.

[0035] Furthermore, in the present embodiment, the overload protection device 60 is arranged on the housing 4 of the cooking appliance 2 by means of the drive device 24 in such a way that the adjusting element 65 is directly accessible from the outside.

[0036] The following describes the functioning of the cooking appliance according to the invention with the drive device according to the present embodiment, based on the Fig. 1 bis 4 explained in more detail.

[0037] Initially, the cooking appliance 2 is in a non-operating state and the cooking chamber door 18 is in its closed position. The pull-out tray 22 is in its inserted position.

[0038] The user now wants to place the food to be cooked, for example a piece of meat, onto the separate accessory, which is held against the extension 22 and designed as a baking tray. The user, the food to be cooked, and the separate accessory are in the Fig. 1 bis 4 not shown.

[0039] For this purpose, the user grasps the oven door 18 and manually moves it from its closed position to its open position. The position of the oven door 18 changes gradually from its closed position, i.e., 0°, to its open position, namely 90°. This transition is not shown in detail, but the Fig. 2 and 3 with a 75° angle and the Fig. 1 correspond to the 90° position of the oven door 18. From the oven door 18, the Fig. 2 and 3 Only the hinge 32 of the oven door 18 with a hinge blade 33 can be seen.

[0040] During the aforementioned manual movement of the oven door 18 from its closed position to its open position, the extension 22 is automatically moved from its inserted position to its extended position due to the mechanical coupling by means of the drive device 24. During the movement of the oven door 18 from its closed position to its open position, an actuating rod 52 of the hinge 32, which is pivotally mounted at one end on the hinge blade 33, is automatically moved along with it. The coupling bolt 38 is arranged on the actuating rod 52, so that the coupling bolt 38 is also automatically moved along with it. The actuating rod 52 is longitudinally displaceable and pivotally fixed at its other end, located opposite the aforementioned end, to a remaining portion of the hinge 32. For this purpose, the aforementioned remaining portion of the hinge 32 has a retaining bolt 54, and the actuating rod 52 has a corresponding longitudinal guide 56.

[0041] When the oven door 18 moves from its 0° position (closed position) to approximately its 55° position, the extension 22 remains in its inserted position. The coupling bolt 38 is therefore initially moved independently of the drive fork 40.

[0042] After the oven door 18 passes approximately a 55° angle, the coupling bolt 38 engages the drive fork 40, so that as the oven door 18 continues to move from its closed to its open position, the coupling bolt 38 automatically moves the toothed disc 34 by means of the drive fork 40. This rotation of the toothed disc 34 also rotates the gear 36, the drive shaft 28, and the drive rod 30, which is connected to the drive shaft 28 to transmit torque.Due to the fact that the drive rod 30 engages with the cam (not shown) in the cam of the connecting rail 46, transmitting force, the aforementioned rotary movement of the drive shaft 28 is converted by means of the drive rod 30 and the aforementioned cam-cam pairing into a linear movement of the extension 22 parallel to the two side grids 48, 50, so that the extension 22 is automatically transferred from its inserted position to its extended position. See the figure below. Fig. 2 and 3 .

[0043] According to the Fig. 1 The oven door 18 is in its open position, i.e., at a 90° angle. The pull-out shelf 22 is in its extended position. The user can then place the food onto the separate accessory, namely the baking tray, which is attached to the pull-out shelf 22, as desired.

[0044] Once this has occurred, the user wishes to return the extension 22 to its inserted position and close the oven door 18 to begin cooking. To do this, the user grasps the oven door 18 and manually moves it from its open position to its closed position. This movement of the oven door 18, as described above, is repeated, but in reverse. The drive device 24 is designed such that, as the oven door 18 moves from its 90° position (open position) to its closed position, the extension 22 is automatically moved along with it in the manner described above, without colliding with the oven door 18.Thus, when the oven door 18 is moved from its open position to its closed position, and consequently when the extension 22 is moved from its extended position to its retracted position, the coupling bolt 38 does not move independently of the drive fork 40. The drive fork 40 is therefore immediately moved along with the coupling bolt 38. During the aforementioned movement of the oven door 18 from its open position to its closed position, the coupling bolt 38 automatically moves the toothed disc 34 by means of the drive fork 40, so that the gear 36, and thus the drive shaft 28 and the drive rod 30, are also rotated.Due to the fact that the drive rod 30 engages with the cam (not shown) in the cam of the connecting rail 46 in a force-transmitting manner, the aforementioned rotary movement of the drive shaft 28 is converted by means of the drive rod 30 and the aforementioned cam-cam pairing into a linear movement of the extension 22 parallel to the two side grids 48, 50, so that the extension 22 is automatically transferred from its extended position to its retracted position.

[0045] In order to protect the drive device 24 from damage caused by an overload, the drive device 24 additionally has the overload protection device 60 designed as a slip clutch according to the invention.

[0046] The friction lining 66, which is attached to the drive fork 40 and designed as a rubber coating, is pre-tensioned against the toothed disc 34 by means of the spring 72. According to the invention, the spring force of the spring 72 is adjustable and readjustable, so that a normal force, i.e., the contact force with which the two contact surfaces 62, 64 are pressed together, can be adjusted or readjusted in advance or during maintenance of the cooking appliance 2 in the manner described above. When the cooking chamber door 18 is moved into its closed or open position, the drive fork 40 on one side and the toothed disc 34 on the other side are resynchronized with each other by means of the two contact surfaces 62, 64, i.e., properly aligned with each other. The overload protection device 60 is thus designed such that the aforementioned synchronization occurs automatically every time the cooking chamber door 18 is moved into its closed or open position.In the present embodiment, the overload protection device 60 is thus simultaneously designed as a synchronizer for automatically aligning the drive fork 40 and the toothed disc 34 into a correct position relative to each other. Due to the aforementioned design of the slip clutch 60, it can compensate for an overload in both directions of rotation of the toothed disc 34. Accordingly, the overload protection device 60 is designed such that it compensates for both incorrect operation of the extension 22 in the direction of its insertion position and incorrect operation of the extension 22 in the direction of its extension position.

[0047] Alternatively or in addition to the two contact surfaces 62, 64, i.e., a purely frictional connection, it is also conceivable that the slip clutch in other embodiments forms a purely positive connection or a combination of positive and frictional connection in a non-overload case. Thus, in other embodiments of the cooking device according to the invention, the two contact surfaces of the slip clutch can each be designed as a purely positive-locking surface or as a friction surface and simultaneously a positive-locking surface. Instead of the rubber lining 66, other linings, for example material combinations, are also conceivable. Of course, slip clutches are also conceivable in which no lining is used at all, but in which the two contact surfaces are formed, for example, directly on the drive fork and on the toothed disc. The slip clutch can alternatively also be arranged at another location on the drive device.For example, it would be conceivable that the drive shaft is split into two parts, with the slip clutch then being formed at the power transmission point from one part of the drive shaft to the other part. Furthermore, in other embodiments, it would be possible for the connection point between the drive shaft and the drive rod to be designed as the slip clutch.

[0048] Due to the inventive design of the cooking appliance 2 with the drive device 24, the drive device 24 is effectively protected against damage in the event of improper operation of the cooking chamber door 18 and / or the pull-out drawer 22. Furthermore, it is possible to design and manufacture the individual components of the cooking appliance 2 relevant for the automatic movement of the pull-out drawer 22 in a more material-efficient manner. This also makes it possible to manufacture the aforementioned components with larger tolerances and thus more cost-effectively. Therefore, the aforementioned readjustment of the overload protection device 60 simplifies assembly during the manufacture of the cooking appliance 2 equipped with the drive device 24. This is because the possibility of readjustment allows, for example, component and assembly tolerances to be easily compensated for.On the other hand, the overload protection device 60 of the drive device 24 allows for on-site readjustment of the overload protection device 60 after commissioning at the end customer's site. Such readjustment may be necessary, for example, if the contact force acting between the first and second contact surfaces 62, 64 falls below a minimum required for the proper functioning of the overload protection device 60 due to wear and tear. The term "drive rod" is to be interpreted generally here and also includes, for example, rail-like or plate-like designs.

[0049] The design of the drive device 24, namely the drive unit 26 with the integrated overload protection device 60, allows for a defined adjustment of the coefficient of friction acting between the two contact surfaces 62, 64, since the friction lining 66 rubs only along the second contact surface 64 with the first contact surface 62. The stops (not shown) on the overload protection housing 67 ensure that readjustment of the contact force is only possible by manipulating the single adjusting element 65. This is because a rotational movement of the bearing shaft 70 is effectively prevented when adjusting the contact force using the aforementioned stops. Furthermore, the rotation of the second bearing element 76 with the bearing shaft 70 prevents the adjusting element 65, designed as an adjusting nut, from unintentionally loosening from the bearing shaft 70.Furthermore, due to the fact that the bearing shaft 70 protrudes downwards from the overload protection housing 67 at its second end, it is possible to handle the adjusting element 65 without any disassembly of the drive device 24 from the housing 4 of the cooking appliance 2.

Claims

1. Drive device (24) for a pull-out component (22) of a cooking appliance (2) comprising a cooking chamber (16) which is closable by a cooking chamber door (18), for automatically driving the pull-out component (22), the drive device (24) comprising an overload protection device (60) for protecting the drive device (24) from damage caused by improper operation of the cooking chamber door (18) and / or the pull-out component (22), and the overload protection device (60) being designed as a slip clutch comprising a first contact face (62) and a second contact face (64) which is connected to the first contact face (62) so as to transmit force in the absence of overloading, and the two aforementioned contact faces (62, 64) each being designed as a friction face and / or an interlocking face, characterised in that the overload protection device (60) is designed such that a contact force between the first contact face (62) and the second contact face (64) is manually re-settable by means of a re-setting element (65) of the overload protection device (60) without the drive device (24) being disassembled from the rest of the cooking appliance (2) in any way, and the drive device (24) has a drive fork (40) which comprises the first contact face (62) and is couplable to a hinge (32) of the cooking chamber door (18) in a force-transmitting manner, and a toothed washer (34) which comprises the second contact face (64) and is directly or indirectly coupled to the pull-out component (22) in a force-transmitting manner, the toothed washer (34) and the drive fork (40) being mounted on a common bearing shaft (70) of the drive device (24) in a torque-transmitting manner, and being preloadable against one another by means of a spring (72) of the overload protection device (60) and the re-setting element (65).

2. Drive device (24) according to claim 1, characterised in that the overload protection device (60) is designed such that the aforementioned re-setting can be carried out solely by handling a single re-setting element (65) of the overload protection device (60).

3. Drive device (24) according to claim 1 or 2, characterised in that the overload protection device (60) is substantially arranged in an overload protection housing (67) and mounted on the overload protection housing (67), the overload protection housing (67) being detachably or non-detachably connectable to a housing (4) of the cooking appliance (2).

4. Drive device (24) according to any of claims 1 to 3, characterised in that a friction lining and / or interlocking lining (66) having the first contact face (62) or the second contact face is arranged for conjoint rotation on the drive fork (40) or on the toothed washer.

5. Drive device (24) according to claim 3, characterised in that the bearing shaft (70) is mounted on a side (68) of the overload protection housing (67) facing the cooking chamber (16) of the cooking appliance (2) via a first end of the bearing shaft (70) and a first bearing element (74) of the drive device (24), and on a side (69) of the overload protection housing (67) opposite the aforementioned side (68) via a second end of the bearing shaft (70) and a second bearing element (76) of the drive device (24), the first and the second bearing element (74, 76) each being designed to reduce friction compared to the bearing shaft (70) being directly mounted on the overload protection housing (67), preferably in that the second bearing element (76) is designed to interlockingly connect the drive fork (40) to the bearing shaft (70), particularly preferably in that the bearing shaft (70) has a contour which interlockingly engages with the second bearing element (76) and the toothed washer (34).

6. Drive device (24) according to the preceding claim, characterised in that the bearing shaft (70) has an external thread at the second end of the bearing shaft (70) and the re-setting element (65) is designed as a re-setting nut comprising an internal thread corresponding to the external thread.

7. Drive device (24) according to any of the preceding claims, characterised in that the toothed washer (34) and the drive fork (40) are arranged between the spring (72) and the re-setting element (65), preferably in that the spring (72) is designed as at least one disc spring.

8. Drive device (24) according to any of the preceding claims, characterised in that the overload protection device (60) is designed such that the overload protection device (60) compensates for both incorrect operation of the pull-out component (22) in the direction of its slide-in position and incorrect operation of the pull-out component (22) in the direction of its pull-out position.

9. Drive device (24) according to any of the preceding claims, characterised in that the overload protection device (60) is arranged on the housing (4) of the cooking appliance (2) by means of the drive device (24) such that the re-setting element (65) is directly accessible from the outside.

10. Cooking appliance (2) comprising a housing (4), a cooking chamber (16) arranged in the housing (4) and delimited by cooking chamber walls (6, 8, 10, 12, 14), a cooking chamber door (18), which is movable back and forth between a closed position and an open position, for closing a cooking chamber opening (20) of the cooking chamber (16) in the closed position of the cooking chamber door (18) and for accessing the cooking chamber (16) by means of the cooking chamber opening (20) in the open position of the cooking chamber door (18), and a pull-out component (22), which is arranged on at least one cooking chamber wall (10, 12) of the cooking chamber walls (6, 8, 10, 12, 14), for holding a separate accessory of the cooking appliance (2) for receiving food to be cooked, the pull-out component (22) being automatically movable, by means of a drive device (24) of the cooking appliance (2) for driving the pull-out component (22), back and forth between a slide-in position in which the pull-out component (22) is completely received in the cooking chamber (16) and a pull-out position in which the pull-out component (22) has been moved at least partially out of the cooking chamber (16), characterised in that the drive device (24) is designed according to any of claims 1 to 9.

11. Cooking appliance (2) according to claim 10, characterised in that the drive device (24) has a drive unit (26), which is arranged outside the cooking chamber (16) and is mechanically coupled to a hinge (32) of the cooking chamber door (18), for generating a torque, a drive shaft (28) connected to the drive unit (26) in a torque-transmitting manner and passing through one of the cooking chamber walls (6) in a substantially sealed manner, and a drive rod (30) connected to the drive shaft (28) in a torque-transmitting manner and to the pull-out component (22) in a force-transmitting manner, the overload protection device (60) being designed as an integral part of the drive unit (26).