household dishwasher

Abstract

Household dishwasher (1) with a wash tub (2), a load holder (12) for receiving loads and a lifting device (16) which is configured to move the load holder (12) in a first displacement plane (E1) from an initial state (AZ) arranged inside the wash tub (2) to an end state (EZ) arranged outside the wash tub (2) and vice versa, and which is configured to raise the load holder (12) in a second displacement plane (E2) different from the first displacement plane (E1) from an initial position (AP) to an end position (EP) and to lower it from the end position (EP) to the initial position (AP), wherein the lifting device (16) has a linear drive (17) and a coupling unit (22) for coupling the load holder (12) to the linear drive (17), wherein the coupling unit (22) is configured from a first coupling state (K1),in which the dishware holder (12) is coupled to the linear drive (17) in such a way that it can only be moved in the first displacement plane (E1) with the aid of the linear drive (17), into a second coupling state (K2) in which the dishware holder (12) is coupled to the linear drive (17) in such a way that it can only be moved in the second displacement plane (E2) with the aid of the linear drive (17), and vice versa, wherein the coupling unit (22) has a first coupling element (26) which is coupled to the linear drive (17) in the first coupling state (K1) and which is decoupled from the linear drive (17) in the second coupling state (K2), and wherein the linear drive (17) has a spindle element (19) rotatably mounted in or on the washing container (2),wherein the first coupling element (26) is in positive engagement with the spindle element (19) in the first coupling state (K1) and is out of positive engagement with the spindle element (19) in the second coupling state (K2).

Description

[0001] The present invention relates to a household dishwasher.

[0002] A dishwasher comprises a wash tub and at least one dishware receptacle that can be moved into and out of the wash tub. In particular, such a dishwasher can comprise several dishware receptacles arranged one above the other, such as a lower basket, an upper basket, or a cutlery drawer. Since the lower basket is located near the bottom of the wash tub, loading or unloading the lower basket requires the user to kneel or bend down toward the lower basket.

[0003] The document DE 600 09 799 T2 discloses a lifting device for a lower basket of a dishwasher, wherein the dishwasher comprises a wash tub with a bottom wall, a rear wall, and a front surface provided with a locking door, and two pairs of intersecting levers which are pivotally connected to one another. The levers are pivotally connected to one another along a center line, have upper ends for supporting the lower basket, and have lower ends which are movable toward and away from one another in a controlled manner by the rotational movement of at least one telescopic shaft. The at least one telescopic shaft is carried by the lower ends of the levers and extends horizontally along the bottom wall of the wash tub. The rotational movement of the at least one telescopic shaft is controlled by a motor device which is fixedly attached to the rear wall of the wash tub.The at least one telescopic shaft may comprise mutually slidable parts that are connected to one another by means of a coupling device to perform a rotary movement. Furthermore, the motor device may comprise an electric motor that provides the rotary movement of the at least one telescopic shaft. Furthermore, the upper ends of the levers may be articulated to associated coupling boxes that are slidably mounted on sliding bushings that are rigidly connected to the lower basket.

[0004] The document DE 10 2015 002 945 A1 discloses a drawer with a drawer body and a guide. The drawer has a lifting device adapted to displace the drawer body vertically when fully extended. The drawer can be motorized, in particular with a linear motor with reversible direction of rotation, and preferably has one or more limit switches. Furthermore, the lifting device can have a scissor drive and / or a spindle drive. The extension device and the lifting device can also be coupled such that the vertical displacement of the drawer body only occurs when the drawer body is fully extended. Furthermore, a drive means of the drawer can be drivingly coupled to the drive of the extension device in a first drawer state and to the drive of the lifting device in a second drawer state.

[0005] The document DE 10 2005 010 616 A1 discloses a dishwasher with a storage container for items to be cleaned, to which a drive is assigned which automatically moves the storage container into or out of a treatment chamber of a washing container by actuating a switching element.

[0006] The document WO 2014 / 102 367 A1 discloses a dishwasher with a body, a door through which the body is accessible, and a height-adjustable lower dishware holder in which dishes can be placed.

[0007] The document WO 2015 / 165606 A1 discloses a dishwasher with a lifting device for raising and lowering a lower dishware holder.

[0008] EP 1 066 789 B1 discloses a lifting device for raising a lower dishware holder of a dishwasher. The lifting device comprises a scissor-type lifting table.

[0009] The document EP 1 744 656 B1 discloses a dishwasher with at least one lower basket for dishes to be cleaned, which is movable between a first position in a container of the dishwasher and a second position mainly outside the container.

[0010] US 2007 / 0 035 220 A1 discloses a dishwasher with a lifting device for raising a lower dishware holder. The lifting device has pivoting arms pivotably attached to a wash tub of the dishwasher.

[0011] Against this background, one object of the invention is to provide an improved household dishwasher.

[0012] Accordingly, a household dishwasher is proposed. The household dishwasher comprises a washing container, a dishware holder for receiving dishes, and a lifting device configured to displace the dishware holder in a first displacement plane from an initial state arranged inside the washing container to a final state arranged outside the washing container, or vice versa. The lifting device is configured to raise the dishware holder in a second displacement plane different from the first displacement plane from an initial position to an end position and to lower it from the end position to the initial position.The lifting device comprises a linear drive and a coupling unit for coupling the dishware holder to the linear drive. The coupling unit can be moved from a first coupling state, in which the dishware holder is coupled to the linear drive in such a way that it can only be moved in the first displacement plane with the aid of the linear drive, to a second coupling state, in which the dishware holder is coupled to the linear drive in such a way that it can only be moved in the second displacement plane with the aid of the linear drive, and vice versa. The coupling unit comprises a first coupling element, which is coupled to the linear drive in the first coupling state and decoupled from the linear drive in the second coupling state.The linear drive has a spindle element rotatably mounted in or on the rinsing container, wherein the first coupling element is in positive engagement with the spindle element in the first coupling state and is out of positive engagement with the spindle element in the second coupling state.

[0013] Because the linear drive enables movement along both the first and second planes, additional drive elements are unnecessary. The washware holder can therefore be moved out of the wash tub, into it, raised, and lowered using just one linear drive.

[0014] The dishware holder is preferably a lower dishware holder or a lower basket. The lifting device preferably has only one or precisely one linear drive (linear stage). The linear drive can also be referred to as a linear stage. In particular, in the first coupling state, the dishware holder can be displaced only in the first displacement plane and not in the second displacement plane, and in the second coupling state, it can be displaced only in the second displacement plane and not in the first displacement plane.

[0015] The first coupling element can also be manually decoupled from the linear drive, so that the dishware holder can also be manually moved from the initial state to the final state and vice versa. In particular, in the second coupling state, the first coupling element is no longer directly coupled to the linear drive, in particular a spindle element of the linear drive. However, an indirect coupling of the first coupling element to the linear drive, i.e., a coupling via additional coupling elements, is possible in the second coupling state.

[0016] The spindle element preferably has an engagement section on the outside, for example an external thread, which runs around the spindle element in a thread-like or screw-like manner and into which a corresponding, in particular first, counter-engagement section, for example an internal thread, of the first coupling element engages in a form-fitting manner in the first coupling state. In the second coupling state, the counter-engagement section of the first coupling element is out of form-fitting engagement with the engagement section of the spindle element. When the coupling unit is moved from the first coupling state to the second coupling state, the first coupling element can be lifted off the spindle element against the direction of gravity. For this purpose, the first coupling element in the first coupling state does not completely encompass the spindle element circumferentially, but in particular with an encompassing angle of less than 180°.The spindle element is preferably arranged below the dishware holder.

[0017] Preferably, the linear drive comprises only one such spindle element. The spindle element is preferably arranged within the washing container.

[0018] According to one embodiment, the first displacement plane is positioned perpendicular to the second displacement plane.

[0019] In this context, "perpendicular" is understood to mean, in particular, an angle of 90° ± 20°, preferably 90° ± 10°, more preferably 90° ± 5°, more preferably 90° ± 1°, more preferably exactly 90°. The first displacement plane is preferably positioned horizontally. This means that the first displacement plane is oriented perpendicular to a direction of gravity. The second displacement plane is preferably positioned vertically. This means that the second displacement plane is parallel to the direction of gravity or oriented in the direction of gravity. The first displacement plane can also be referred to as a horizontal displacement plane, and the second displacement plane can also be referred to as a vertical displacement plane.

[0020] According to a further embodiment, the linear drive has a drive element coupled to the spindle element, wherein the first coupling element and the spindle element are configured to convert a rotational movement of the drive element into a translational movement of the dishware holder in the first displacement plane.

[0021] The drive element is preferably an electric motor. In particular, the drive element can be a stepper motor. A translational movement is understood here to mean a linear movement in only one direction. In particular, with the aid of the first coupling element and the spindle element, a rotary movement of the drive element for moving the dishware holder from the initial state to the final state and vice versa can be converted into a linear movement.

[0022] According to a further embodiment, the coupling unit has a second coupling element which is decoupled from the linear drive in the first coupling state and coupled to the linear drive in the second coupling state.

[0023] The second coupling element preferably comprises a bevel gear that is arranged in a rotationally fixed manner on a threaded spindle. The threaded spindle is preferably rotatably mounted in a housing of the coupling unit. The threaded spindle has a helical or thread-shaped circumferential engagement portion, in particular an external thread, on the outside, which is configured to positively engage a corresponding, in particular second, counter-engagement portion of the first coupling element. This means that the second coupling element can be operatively connected to the first coupling element.

[0024] According to a further embodiment, the second coupling element is operatively connected to the first coupling element in such a way that the second coupling element is configured to decouple the first coupling element from the linear drive when the coupling unit is moved from the first coupling state to the second coupling state.

[0025] In particular, this means that the second coupling element is configured, with the aid of a rotational movement thereof, to lift the first coupling element from the spindle element of the linear drive in order to decouple it directly from the linear drive. An indirect coupling of the first coupling element to the linear drive via the second coupling element can still exist in the second coupling state. When the coupling unit is moved from the second coupling state to the first coupling state, the second coupling element in turn couples the first coupling element, in particular directly, to the linear drive. An indirect coupling is understood here to mean a coupling via further components or coupling elements. A direct coupling is understood to mean a direct connection.

[0026] According to a further embodiment, the second coupling element has an engagement portion which positively engages with a counter-engagement portion of the first coupling element in order to decouple the first coupling element from the linear drive.

[0027] As previously mentioned, the engagement portion of the second coupling element is designed as a helical or spirally circumferential engagement portion on the threaded spindle of the second coupling element. The first coupling element preferably has a corresponding, in particular second, counter-engagement portion designed as an internal thread.

[0028] According to a further embodiment, the linear drive has a driven third coupling element into which the second coupling element engages in a form-fitting manner when the coupling unit is moved from the first coupling state into the second coupling state.

[0029] The third coupling element is preferably rotatably mounted in or on the washing container. The third coupling element preferably has a spur gear that engages a corresponding spur gear mounted on the spindle element in a rotationally fixed manner. This means that during a rotational movement of the spindle element, the third coupling element is also driven. In addition to the spur gear, the third coupling element also has a bevel gear that is configured to positively engage the corresponding bevel gear of the second coupling element in order to drive it.

[0030] According to a further embodiment, in the second coupling state, the second coupling element drives the first coupling element to raise the dishware holder from the starting position to the end position and to lower it from the end position to the starting position.

[0031] This means that in the second coupling state, the second coupling element is driven via the spindle element, the spur gear provided on the spindle element, the spur gear of the third coupling element, the bevel gear of the third coupling element, and the bevel gear of the second coupling element. The second coupling element, in turn, drives the first coupling element to raise it, together with the dishware holder, from the starting position to the end position and, conversely, to lower it from the end position back to the starting position.

[0032] According to a further embodiment, the first coupling element comprises a first half-shell, a second half-shell pivotably coupled to the first half-shell, and a closure connecting the half-shells, wherein the first coupling element can be manually decoupled from the second coupling element by opening the closure.

[0033] Preferably, the first half-shell and the second half-shell are pivotally connected to one another about a pivot axis. The closure preferably comprises a closure element and a manually actuated quick-release element. By actuating the quick-release element, the two half-shells can be pivoted away from each other, causing the first coupling element to disengage from the second coupling element. This allows the dishware holder to be moved manually without the linear drive.

[0034] According to a further embodiment, the second coupling element is rotatably mounted in a housing of the coupling unit.

[0035] In particular, the threaded spindle of the second coupling element is rotatably mounted in the housing. Preferably, the second coupling element is oriented vertically, i.e., in the direction of gravity. The threaded spindle of the second coupling element is positioned, in particular, perpendicular to the spindle element of the linear drive.

[0036] According to a further embodiment, the lifting device has a guide rail along which the coupling unit is guided in the first displacement plane.

[0037] Preferably, a guide element is provided that is guided linearly along the guide rail. The guide element, in turn, is connected to the housing of the coupling unit to guide the coupling unit linearly along the guide rail.

[0038] According to a further embodiment, the lifting device has a position sensor which is designed to detect a position of the coupling unit relative to the guide rail when the coupling unit is displaced along the guide rail.

[0039] The position sensor is preferably an inductive sensor, an optical sensor, or any other type of sensor. The position sensor can thus constantly detect the position of the dishware holder.

[0040] According to a further embodiment, the guide rail has an encoder.

[0041] With the help of the encoder and / or the position sensor, the position of the dishware holder can be constantly detected. The encoder can also be referred to as a pulse generator or can be designed as a pulse generator.

[0042] Further possible implementations of the household dishwasher also include combinations of features or embodiments described above or below with respect to the exemplary embodiments that are not explicitly mentioned. In this case, the person skilled in the art will also add individual aspects as improvements or additions to the respective basic form of the household dishwasher.

[0043] Further advantageous configurations and aspects of the household dishwasher are the subject of the dependent claims and the exemplary embodiments of the household dishwasher described below. The household dishwasher is explained in more detail below using preferred embodiments with reference to the accompanying figures.

[0044] It shows Fig. 1 is a schematic perspective view of an embodiment of a household dishwasher; Fig. 2 a schematic sectional view of the household dishwasher according to Fig. 1; Fig. 3 is a further schematic sectional view of the household dishwasher according to Fig. 1; Fig. 4 is a further schematic sectional view of the household dishwasher according to Fig. 1; Fig. 5 a schematic view of an embodiment of a lifting device for the household dishwasher according to Fig. 1; Fig. 6 a schematic view of another embodiment of a lifting device for the household dishwasher according to Fig. 1; and Fig. 7 a schematic view of an embodiment of a coupling element for the lifting device according to Fig. 5 or Fig. 6.

[0045] In the figures, identical or functionally equivalent elements have been given the same reference numerals unless otherwise stated.

[0046] The Fig. 1 shows a schematic perspective view of an embodiment of a household dishwasher 1. The household dishwasher 1 comprises a washing container 2, which can be closed, in particular watertight, by a door 3. For this purpose, a sealing device can be provided between the door 3 and the washing container 2. The washing container 2 is preferably cuboid-shaped. The washing container 2 can be arranged in a housing of the household dishwasher 1. The washing container 2 and the door 3 can form a washing chamber 4 for washing dishes.

[0047] Door 3 is in the Fig. 1 in its open position. The door 3 can be closed or opened by pivoting about a pivot axis 5 provided at a lower end of the door 3. With the help of the door 3, a loading opening 6 of the washing container 2 can be closed or opened. The washing container 2 has a base 7, a ceiling 8 arranged opposite the base 7, a rear wall 9 arranged opposite the closed door 3 and two side walls 10, 11 arranged opposite one another. The base 7, the ceiling 8, the rear wall 9 and the side walls 10, 11 can be made, for example, from a stainless steel sheet. Alternatively, the base 7 can, for example, be made from a plastic material.

[0048] The household dishwasher 1 further comprises at least one dishware receptacle 12 to 14. Preferably, several, for example three, dishware receptacles 12 to 14 can be provided, wherein the dishware receptacle 12 can be a lower dishware receptacle or a lower basket, the dishware receptacle 13 can be an upper dishware receptacle or an upper basket, and the dishware receptacle 14 can be a cutlery drawer. Fig. As further shown in Figure 1, the dishware receptacles 12 to 14 are arranged one above the other in the washing container 2. Each dishware receptacle 12 to 14 can be selectively moved into or out of the washing container 2. In particular, each dishware receptacle 12 to 14 can be pushed or moved into the washing container 2 in an insertion direction E (arrow) and pulled or moved out of the washing container 2 in an extension direction A (arrow) opposite to the insertion direction E (arrow).

[0049] The dishware holder 12 can also be moved in the extension direction A (arrow) and the insertion direction E (arrow) by means of a lifting device to be explained later, and can be raised and lowered again from an initial position to an end position in which it is preferably arranged in front of the dishware holder 13 and at approximately the same height as the latter.

[0050] The Fig. Figures 2 to 4 each show schematic sectional views of the household dishwasher 1. A rotatable spray arm 15 for distributing wash liquor is provided in the wash tub 2 between the floor 7 and the dishware holder 12. Several such spray arms 15 may be provided.

[0051] The household dishwasher 1 comprises, as already mentioned, a lifting device 16 which is designed to lift the dishware holder 12 in a first displacement plane E1 from a Fig. 2 shown initial state AZ arranged within the rinsing container 2 into a state shown in the Fig. 3, arranged outside the washing container 2, and vice versa. In this case, the washware holder 12 is moved in the extension direction A (arrow) or in the insertion direction E (arrow). The lifting device 16 is also shown in an enlarged view in the Fig. 5 shown.

[0052] The lifting device 16 is further configured to lift the dishware holder 12 in a second displacement plane E2, which differs from the first displacement plane E1, from a position shown in the Fig. 3 shown starting position AP into a position shown in the Fig. 4 and lower it from the end position EP back to the starting position AP. This means that with the aid of the lifting device 16, the washware holder 12 can be moved out of the washing container 2 and back into it, as well as raised and lowered.

[0053] The first displacement plane E1 is positioned horizontally. In particular, the first displacement plane E1 is oriented perpendicular to a direction of gravity g (arrow). The first displacement plane E1 can also be referred to as a horizontal displacement plane. The extension direction A (arrow) and the insertion direction E (arrow) are arranged in or parallel to the first displacement plane E1. The second displacement plane E2 is oriented vertically and thus parallel to the direction of gravity g (arrow). The second displacement plane E2 can also be referred to as a vertical displacement plane. The first displacement plane E1 and the second displacement plane E2 are positioned perpendicular to each other.In the present case, perpendicular means that an angle of 90° ± 20°, preferably of 90° ± 10°, more preferably of 90° ± 5°, more preferably of 90° ± 1°, more preferably of exactly 90, is provided between the first displacement plane E1 and the second displacement plane E2.

[0054] In the starting position AP, the washware holder 12 is preferably positioned below and next to the washware holder 13. In the end position EP, the washware holder 12 is preferably positioned at the same height as the washware holder 13 and next to it. The lifting device 16 has a linear drive 17 (English: "linear stage") for moving the washware holder 12 from the starting state AZ to the end state EZ and vice versa, or for moving the washware holder 12 from the starting position AP to the end position EP and vice versa. The linear drive 17 can also be referred to as a linear table. In particular, only a single or exactly one linear drive 17 is provided.

[0055] The linear drive 17 comprises a drive element 18, in particular an electric motor. The drive element 18 can be, for example, a stepper motor. The drive element 18 can, as shown in the Fig. 2 to 4, be arranged outside the rinsing container 2. Alternatively, the drive element 18 can also be arranged inside the rinsing container 2. In this case, the drive element 18 is preferably encapsulated in a watertight manner.

[0056] The linear drive 17 comprises, in addition to the drive element 18, a spindle element 19 coupled thereto in a rotationally fixed manner. The spindle element 19 can be, for example, a threaded spindle. The spindle element 19 can be rotatably mounted on the washing container 2. The spindle element 19 is arranged within the washing container 2, i.e., in the washing chamber 4. The spindle element 19 comprises an engagement section 20 ( Fig. 5). For example, the engagement portion 20 is an external thread provided on the spindle element 19.

[0057] The lifting device 16 further comprises a guide rail 21, in particular a linear guide. The guide rail 21 is arranged parallel to the spindle element 19. The guide rail 21 can be mounted on or in the washing container 2. Unlike the spindle element 19, the guide rail 21 is mounted in a rotationally fixed and non-rotatable manner. The guide rail 21 can be assigned to the linear drive 17.

[0058] The lifting device 16 is further assigned a coupling unit 22 for coupling the washware holder 12 to the linear drive 17. The coupling unit 22 carries the washware holder 12. The coupling unit 22 can also be referred to as a washware holder support. The coupling unit 22 is connected to a Fig. 2, Fig. 3 and Fig. 5 (left side of the Fig. 5) shown first coupling state K1 into one in the Fig. 4 and Fig. 5 (right side of the Fig. 5) shown second coupling state K2 and vice versa.

[0059] In the first coupling state K1, the coupling unit 22 and thus the washware holder 12 are coupled to the linear drive 17 in such a way that the washware holder 12 can be displaced with the aid of the linear drive 17 only in the first displacement plane E1, i.e., in the extension direction A (arrow) and in the insertion direction E (arrow), and not in the second extension plane E2. In the second coupling state K2, the coupling unit 22 and thus the washware holder 12 are in turn coupled to the linear drive 17 in such a way that the washware holder 12 can be displaced with the aid of the linear drive 17 only in the second displacement plane E2 and not in the first displacement plane E1.

[0060] This means that in the first coupling state K1, the washware holder 12 can only be moved from the initial state AZ to the final state EZ and vice versa with the aid of the linear drive 17, and in the second coupling state K2, the washware holder 12 can only be raised from the initial position AP to the final position EP and lowered from the final position EP to the initial position AP with the aid of the linear drive 17. This means that a simultaneous displacement of the washware holder 12 in the first displacement plane E1 and in the second displacement plane E2 is preferably not possible. The movements of the washware holder 12 in the first displacement plane E1 and in the second displacement plane E2 are thus separated or decoupled from one another.

[0061] As previously mentioned, the lifting device 16 thus has only one linear drive 17, which is responsible for both the displacement of the washware holder 12 in the first displacement plane E1 and the displacement of the washware holder 12 in the second displacement plane E2. This means that two different drives are not required for the displacement of the washware holder 12 in the first displacement plane E1 and in the second displacement plane E2.

[0062] The linear drive 17 further comprises a guide element 23 guided linearly along the guide rail 21 in the first displacement plane E1, i.e., in the extension direction A (arrow) and in the insertion direction E (arrow). The guide element 23 can also be assigned to the coupling unit 22. The coupling unit 22 further comprises a housing 24 connected to the guide element 23. The housing 24 is guided along the guide rail 21, in particular with the aid of the guide element 23.

[0063] An opening or bore 25 is provided in the housing 24. A first coupling element 26 of the coupling unit 22 is accommodated at least partially in the bore 25. The first coupling element 26 has a first counter-engagement section 27 ( Fig. 5). The first counter-engagement portion 27 can be a thread. The first counter-engagement portion 27 does not completely encompass the engagement portion 20, but only partially, so that the first coupling element 26 can be lifted off the spindle element 19 against the direction of gravity g (arrow).

[0064] The first counter-engagement section 27 is configured to positively engage the engagement section 20 of the spindle element 19. A positive connection is created by the interlocking or engaging of at least two connection partners, in this case the engagement section 20 and the first counter-engagement section 27. Upon rotation of the spindle element 19, the first coupling element 26 then moves in the first displacement plane E1 in the extension direction A (arrow) or in the insertion direction E (arrow). In the first coupling state K1, the first coupling element 26 is thus coupled to the linear drive 17 by the first counter-engagement section 27 of the first coupling element 26 positively engaging the engagement section 20 of the spindle element 19.

[0065] In the second coupling state K2, the first coupling element 26 is decoupled from the linear drive 17. This means that in the second coupling state K2, the first counter-engagement portion 27 of the first coupling element 26 no longer engages with the engagement portion 20 of the spindle element 19. For this purpose, the first coupling element 26 is lifted from the spindle element 19 counter to the direction of gravity g (arrow) when the coupling unit 22 is moved from the first coupling state K1 to the second coupling state K2.

[0066] To decouple the first coupling element 26 from the spindle element 19, the coupling unit 22 comprises a second coupling element 28. The second coupling element 28 comprises, for example, a bevel gear 29, a threaded spindle 30 which is connected to the bevel gear 29 in a rotationally fixed manner and mounted within the bore 25, which is guided through the first coupling element 26 and is in positive engagement with it. For this purpose, the threaded spindle 30 has an engagement section 31 ( Fig. 5), for example an external thread, which is designed to engage in a corresponding second counter-engagement section 32 ( Fig. 5), for example an internal thread, of the first coupling element 26.

[0067] The coupling unit 22 is also assigned a third coupling element 33. The third coupling element 33 can be operatively connected to the second coupling element 28 and can be coupled to it or decoupled from it. The third coupling element 33 is rotatably mounted on the rinsing container 2. The third coupling element 33 can comprise a spur gear 34 and a bevel gear 35, which is designed to positively engage the second coupling element 28, in particular the bevel gear 29. The spur gear 34 of the third coupling element 33 is in turn engaged with a spur gear 36 provided at the end of the spindle element 19. The spur gear 36 is connected to the spindle element 19 in a rotationally fixed manner, such that the spur gear 36 rotates when the spindle element 19 rotates.

[0068] The functionality of the lifting device 16 is explained below. First, the dishware holder 12 is located, as shown in the Fig. 2 and Fig. 5 (left side), in the initial state AZ arranged in the washing container 2. The first coupling element 26 of the coupling unit 22 is in positive engagement with the spindle element 19 of the linear drive 17. By activating the linear drive 17, the coupling unit 22 moves together with the washware holder 12 in the first displacement plane E1 in the pull-out direction A (arrow) from the initial state AZ into the position shown in the Fig. 3 shown final state EZ.

[0069] As soon as the dishware holder 12 has been moved into the final position EZ, the second coupling element 28 couples to the linear drive 17. The bevel gear 29 of the second coupling element 28 engages positively with the bevel gear 35 of the third coupling element 33. This causes the threaded spindle 30 of the second coupling element 28 to rotate, whereby the first coupling element 26 is lifted off the spindle element 19 and displaced upwards in the second displacement plane E2 against the direction of gravity g (arrow) in the direction of the dishware holder 12. The first coupling element 26 is thereby disengaged from the spindle element 19 by being lifted off the spindle element 19. Fig. 5 (right side) shows the first coupling element 26 immediately after it has been lifted off the spindle element 19. The dishware holder 12 is now, after the first coupling element 26 has been uncoupled from the spindle element 19, lifted off the Fig. 3 shown starting position AP into the position shown in the Fig. 4 shown end position EP raised.

[0070] With the help of the coupling unit 22, a decoupling of the movements of the washware holder 12 in the first displacement plane E1 and the second movement plane E2 can be achieved. Advantageously, both movements can be realized with a single linear drive 17.

[0071] The Fig. Figure 6 shows a further embodiment of the lifting device 16. In this embodiment of the lifting device 16, a position sensor 37 is provided on the guide element 23. The position sensor 37 can be, for example, an inductive sensor, an optical sensor, or any other sensor. The guide rail 21 can also have an encoder. Thus, the position of the coupling unit 22 and thus also of the washware holder 12 can always be determined using the position sensor 37 and / or the encoder.

[0072] The Fig. Figure 7 shows a further development of the first coupling element 26. In this embodiment of the first coupling element 26, it is divided into two half-shells 38, 39, in particular a first half-shell 38 and a second half-shell 39, which are pivotally connected to one another at a pivot axis 40. Opposite the pivot axis 40, a closure 41 is provided, which comprises a closure element 42, in particular a bolt or a screw, and a quick-release element 43.

[0073] By actuating the quick-release element 43, the closure element 42 can be released, allowing the closure 41 to be opened to open the half-shells 38, 39. This allows the engagement portion 31 of the first coupling element 26 and the second counter-engagement portion 32 of the threaded spindle 30 to be disengaged from the positive engagement. This allows the dishware holder 12 to be moved manually in the first displacement plane E1 and / or the second displacement plane E2.

[0074] Although the present invention has been described using exemplary embodiments, it can be modified in many ways. Reference symbols used 1 household dishwasher 2 rinsing containers 3 Door 4 Washing compartment 5 swivel axis 6 Loading opening 7 Floor 8 Ceiling 9 Rear wall 10 Side wall 11 Side wall 12 Dishwasher waste holder 13 Dishwasher drawer 14 Dishwasher drawer 15 Spray arm 16 Lifting device 17 Linear drive 18 Drive element 19 Spindle element 20 intervention section 21 Guide rail 22 Coupling unit 23 Guide element 24 housings 25 bore 26 coupling element 27 Counter-intervention section 28 coupling element 29 Bevel gear 30 threaded spindle 31 intervention section 32 Counter-intervention section 33 Coupling element 34 Spur gear 35 bevel gear 36 Spur gear 37 Position sensor 38 half shell 39 half shell 40 axis of rotation 41 Closure 42 locking element 43 Quick release element A Extension direction (arrow) AP starting position AZ initial state E Insertion direction (arrow) EP final position EZ final state E1 displacement level E2 displacement level g Direction of gravity (arrow) K1 coupling state K2 coupling state

Claims

[1] Household dishwasher (1) with a washing container (2), a washware holder (12) for receiving washware and a lifting device (16) which is designed to move the washware holder (12) in a first displacement plane (E1) from an initial state (AZ) arranged inside the washing container (2) to an end state (EZ) arranged outside the washing container (2) and vice versa, and which is designed to raise the washware holder (12) in a second displacement plane (E2) different from the first displacement plane (E1) from an initial position (AP) to an end position (EP) and to lower it from the end position (EP) to the initial position (AP), wherein the lifting device (16) has a linear drive (17) and a coupling unit (22) for coupling the washware holder (12) to the linear drive (17), wherein the coupling unit (22) is driven by a first Coupling state (K1),in which the washware holder (12) is coupled to the linear drive (17) in such a way that it can be displaced with the aid of the linear drive (17) only in the first displacement plane (E1), into a second coupling state (K2), in which the washware holder (12) is coupled to the linear drive (17) in such a way that it can be displaced with the aid of the linear drive (17) only in the second displacement plane (E2), and vice versa, wherein the coupling unit (22) has a first coupling element (26) which is coupled to the linear drive (17) in the first coupling state (K1) and which is decoupled from the linear drive (17) in the second coupling state (K2), and wherein the linear drive (17) has a spindle element (19) rotatably mounted in or on the washing container (2),wherein the first coupling element (26) is in positive engagement with the spindle element (19) in the first coupling state (K1) and is out of positive engagement with the spindle element (19) in the second coupling state (K2). [2] Household dishwasher (1) according to claim 1, characterized by that the first displacement plane (E1) is positioned perpendicular to the second displacement plane (E2). [3] Household dishwasher (1) according to claim 1 or 2, characterized by in that the linear drive (17) has a drive element (18) coupled to the spindle element (19), wherein the first coupling element (26) and the spindle element (19) are designed to convert a rotary movement of the drive element (18) into a translatory movement of the dishware holder (12) in the first displacement plane (E1). [4] Household dishwasher (1) according to claim 1, 2 or 3, characterized bythat the coupling unit (22) has a second coupling element (28) which is decoupled from the linear drive (17) in the first coupling state (K1) and coupled to the linear drive (17) in the second coupling state (K2). [5] Household dishwasher (1) according to claim 4, characterized by that the second coupling element (28) is operatively connected to the first coupling element (26) in such a way that the second coupling element (28) is designed to decouple the first coupling element (26) from the linear drive (17) when the coupling unit (22) is moved from the first coupling state (K1) to the second coupling state (K2). [6] Household dishwasher (1) according to claim 5, characterized bythat the second coupling element (28) has an engagement portion (31) which positively engages in a counter-engagement portion (32) of the first coupling element (26) in order to decouple the first coupling element (26) from the linear drive (17). [7] Household dishwasher (1) according to claim 4, 5 or 6, characterized by that the linear drive (17) has a driven third coupling element (33) into which the second coupling element (28) engages in a form-fitting manner when the coupling unit (22) is moved from the first coupling state (K1) into the second coupling state (K2). [8] Household dishwasher (1) according to one of claims 4 to 7, characterized by in that in the second coupling state (K2) the second coupling element (28) drives the first coupling element (26) in order to raise the dishware holder (12) from the starting position (AP) to the end position (EP) and to lower it from the end position (EP) to the starting position (AP). [9] Household dishwasher (1) according to one of claims 4 to 8, characterized by in that the first coupling element (26) has a first half-shell (38), a second half-shell (39) pivotably coupled to the first half-shell (38), and a closure (41) connecting the half-shells (38, 39), wherein the first coupling element (26) can be manually uncoupled from the second coupling element (28) by opening the closure (41). [10] Household dishwasher (1) according to one of claims 4 to 9, characterized by that the second coupling element (28) is rotatably mounted in a housing (24) of the coupling unit (22). [11] Household dishwasher (1) according to one of the preceding claims, characterized by that the lifting device (16) has a guide rail (21) along which the coupling unit (22) is guided in the first displacement plane (E1). [12] Household dishwasher (1) according to claim 11, characterized by in that the lifting device (16) has a position sensor (37) which is designed to detect a position of the coupling unit (22) relative to the guide rail (21) when the coupling unit (22) is displaced along the guide rail (21). [13] Household dishwasher (1) according to claim 11 or 12, characterized by that the guide rail (21) has an encoder.

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