Household appliance, in particular water-bearing household appliance

Abstract

The invention relates to a household appliance, in particular a water-bearing household appliance, with a housing (3) providing a compartment (4) and having a loading opening (5) for accessing the compartment (4), with a door (6) rotatably mounted about a pivot axis for closing the loading opening (5), with a motor unit (14) operatively connected to the door (6), and with a coupling device (15) arranged between the motor unit (14) and the door (6), which is operatively connected to the motor unit (14) on the drive side and to the door (6) on the output side, wherein the coupling device (15) has a first coupling (16) which is switchable and can be moved from a disengaged position to a coupled position and vice versa, characterized in thatthat the device door (6) can be moved by means of the motor unit (14) from a closed position closing the loading opening (5) to an open position and vice versa, depending on the direction of rotation of the motor unit (14), and that the first clutch (16) is designed to effect an automatic switching from the uncoupled position to a coupled position when the motor unit (14) is in operation, wherein the first clutch (16) assumes a first coupled position or a second coupled position depending on the direction of rotation of the motor unit (14).

Description

[0001] The invention relates to a household appliance, in particular a water-bearing household appliance, with an appliance housing providing an appliance compartment and having a loading opening for access to the appliance compartment, with an appliance door rotatably mounted about a pivot axis for closing the loading opening, with a motor unit that is operatively connected to the appliance door, and with a coupling device arranged between the motor unit and the appliance door, which is operatively connected to the motor unit on the drive side and to the appliance door on the output side, wherein the coupling device has a first coupling that is switchable and can be moved from a disengaged position to a coupled position and vice versa.

[0002] Household appliances in general, and water-using household appliances in particular, are well known from the prior art, which is why a separate printed reference is not required here. Therefore, reference is made only by way of example to EP 4 114 243 A1, which discloses a household appliance of this type in the form of a dishwasher.

[0003] A household appliance within the meaning of the invention is, in particular, a water-using household appliance, such as a dishwasher, a washing machine, and / or a dryer. However, the term "household appliance" also includes refrigerators, ovens, steam cookers, microwave ovens, and / or the like.

[0004] A typical household appliance has a housing that provides a storage compartment. The housing has a loading opening to allow user access to this compartment.

[0005] For closing the loading opening during use of the appliance, a door is provided, which is pivotally mounted on the appliance housing around a pivot axis. Under normal operating conditions, the user can move the door from an open position to a closed position that seals the loading opening, and vice versa. In the case of a water-bearing appliance, the door's closure of the loading opening in the closed position is preferably fluid-tight.

[0006] To simplify the pivoting movement of the appliance door from an open position to a closed position that closes the loading opening, the use of a motor unit operatively connected to the appliance door is known from EP 4 114 243 A1, mentioned above. This motor unit allows the appliance door to be moved from an open position to a closed position that closes the loading opening after prior activation of the motor unit by the user, without any further manual intervention by the user.

[0007] For power transmission between the motor unit and the device door, a coupling device is provided according to EP 4 114 243 A1. This coupling device has a first coupling and a second coupling. The first coupling is designed to be switchable, whereas the second coupling is designed as an overload coupling.

[0008] The first coupling can be in either a disengaged or a engaged position. In the engaged position, power is transmitted from the motor unit to the door, moving the door from an open position to a closed position that seals the loading opening. In the disengaged position, the power transmission from the motor unit to the door is interrupted, allowing the door to pivot freely when the motor unit is not in operation. This allows the user, in particular, to move the door from the closed position to an open position.

[0009] The second coupling of the coupling device is designed as an overload coupling and interrupts the power supply in the event of an overload. Such an overload can occur, for example, if the device door is blocked, meaning that a motor-driven pivoting movement of the device door to the closed position is not possible due to the obstruction. In such a case, the overload coupling engages, particularly for reasons of increased safety for the user and to protect the affected components.

[0010] Although the design known from EP 4 114 243 A1 has proven itself in everyday practical use, there is room for improvement. In particular, the aim is to enable even simpler operation of the household appliance by the user. It is therefore the Taskthe invention to further develop a household appliance of the generic type in such a way that, by design, simplified handling of the appliance door by a user is permitted.

[0011] To Solution The invention proposes a household appliance of the generic type to solve this problem, characterized in that the appliance door can be moved from a closed position closing the loading opening to an open position and vice versa by means of the motor unit, depending on the direction of rotation of the motor unit, and that the first clutch is arranged to effect an automatic switching from the uncoupled position to a coupled position when the motor unit is in operation, wherein the first clutch assumes a first coupled position and a second coupled position depending on the direction of rotation of the motor unit.

[0012] In contrast to the prior art according to EP 4 114 243 A1, the household appliance according to the invention has a coupling device that can be switched not only unidirectionally but also bidirectionally. This allows the user to move the appliance door, using the motor unit, not only from an open position to a closed position that closes the loading opening, but also in the reverse direction, i.e., from the closed position that closes the loading opening to an open position. This simplifies handling of the appliance door and thus also simplifies the operation of the household appliance.

[0013] Depending on the direction of rotation of the motor unit in the intended application, the appliance door pivots, driven by the motor, either from the closed position to an open position or from an open position to the closed position. According to the invention, the first coupling is configured to effect an automatic switching from the disengaged position to the engaged position when the motor unit is in operation. Thus, the coupling also switches automatically when the motor unit is operating. The coupling can assume either a first coupled position or a second coupled position. Whether the coupling assumes the first or second coupled position depends on the direction of rotation of the motor unit, i.e., on whether the appliance door is to be moved from an open position to the closed position or vice versa.

[0014] The coupling described above is referred to here and in the following only as the "first" coupling for the sake of clarity, since the coupling can additionally have a second coupling according to an embodiment to be described later; however, the latter is optional.

[0015] As a result, the first clutch can assume three operating positions. A first engaged position for pivoting the door in one direction, a second engaged position for pivoting the door in a second direction, and a disengaged position in which power transmission between the motor unit and the door is interrupted. The clutch engages automatically when the motor unit is operating. When the motor unit is not operating, the clutch is in the disengaged position, allowing the user to manually pivot the door, either towards the closed position or towards the open position.

[0016] As soon as the user activates the motor unit for motorized door swiveling, the first clutch also engages. Separate operation of the clutch by the user is therefore not required. Whether the clutch assumes the first or second switching position when the motor unit is operating depends on the direction in which the motor unit rotates, i.e., whether the user has selected to open or close the appliance door.

[0017] The inventive design enables an electromechanical movement of the appliance door, both moving the appliance door into the closed position and moving it into an open position. The drive train provided for this purpose comprises a motor unit and a coupling device interacting with it.

[0018] The coupling device includes, among other things, a first coupling, which is switchable. The unique design feature of this coupling is that no separate switching by the user is required; instead, the coupling engages automatically as a purely mechanical coupling when the motor unit is in operation. The coupling is bidirectional and, depending on the direction of rotation of the motor unit, assumes either a first coupled position or a second coupled position. In both positions, a force is transmitted from the motor unit to the door. In the first coupled position, the door rotates in one direction, while in the second coupled position, it pivots in the opposite direction.The coupling provided according to the invention allows both the closing and opening of the device door by means of the motor unit. This occurs without the need for any manual switching of the coupling by the user. Instead, the coupling switches to the appropriate position as a result of the motor unit's operation. Consequently, simplified handling is achieved while maintaining operational reliability.

[0019] According to a further feature of the invention, the first coupling has a rotating part arranged in a rotationally fixed manner on a motor shaft of the motor unit, which carries a first clamping piece rotatably arranged thereon about a pivot axis and a second clamping piece rotatably arranged thereon about a pivot axis.

[0020] The first coupling therefore has a rotating part. This part is fixed against rotation on a motor shaft of the motor unit. As a result of the motor unit's operation, the coupling-side rotating part rotates, depending on the direction of rotation of the motor unit.

[0021] Clamping pieces are arranged on the rotating part, specifically a first clamping piece on one side and a second clamping piece on the other. These two clamping pieces are each pivotally mounted on the rotating part about an axis, and can therefore pivot relative to the rotating part. As a result of this pivoting movement, the clamping pieces move radially relative to the rotating part from a retracted position to an extended position and vice versa.

[0022] According to a further feature of the invention, the first clamping piece and the second clamping piece form a rocker element and are designed to pivot about a common pivot axis. Depending on the direction of rotation of the rotating part, either the first clamping piece or the second clamping piece moves radially outwards, i.e., into an extended position.

[0023] According to a further feature of the invention, the first coupling has a coupling part that at least partially receives the rotating part and has an inner contour on the rotating part side that interacts with the clamping pieces. It is also preferably provided that the inner contour has receiving recesses corresponding to the end sections of the clamping pieces located away from the pivot axis.

[0024] In its intended use, the clamping pieces provided by the rotating part interact with the inner contour of the coupling part by engaging the end sections of the clamping pieces furthest from the pivot axis into the corresponding receiving recesses of the coupling part's inner contour. In this position, the coupling is engaged, meaning that force can be transmitted from the rotating part to the coupling part. This coupled position occurs automatically as a result of the motor unit operating. If the motor unit is not operating, the rotating part does not rotate, and therefore the clamping pieces do not pivot. Consequently, the coupling is in its disengaged position, and no force is transmitted from the rotating part to the coupling part. The coupling part can therefore rotate freely relative to the rotating part, allowing the user to manually pivot the device door.

[0025] The clutch only engages when the motor unit is rotating. It is therefore a type of freewheel clutch. When operating manually, i.e., when the motor unit is not active, the clutch does not engage, allowing operation without the motor unit. However, as soon as the user chooses to switch on the motor unit, the clutch engages, enabling motorized operation. The rotating part of the clutch provides a first clamping element on one side and a second clamping element on the other. Depending on the direction of rotation of the motor unit, either the first or the second clamping element engages in the corresponding recess of the clutch part. This allows, as previously described, motorized operation of the appliance door from the open position to the closed position and vice versa.

[0026] According to a further feature of the invention, the rotating part is provided to carry a further first clamping piece and a further second clamping piece, both rotatably arranged thereon about a pivot axis. According to a further feature of the invention, these further clamping pieces can form a rocker element and be rotatable about a common pivot axis.

[0027] According to this preferred embodiment, four clamping pieces are used in particular: two first clamping pieces and two second clamping pieces. Depending on the direction of rotation of the motor unit, either the two first clamping pieces or the two second clamping pieces engage. The use of multiple clamping pieces has the advantage that a greater torque transmission is permitted and that, moreover, the force is introduced symmetrically from the rotating part to the coupling part, which increases the service life of the coupling device according to the invention.

[0028] According to a further feature of the invention, it is provided that the first clamping pieces and / or the second clamping pieces interact with a control cam provided by a control means.

[0029] During operation, the control cam of the control device causes the clamping pieces that interact with it to pivot radially relative to the rotating part. For this purpose, the first clamping pieces and / or the second clamping pieces have a control pin that engages in the control cam of the control device. Such a control pin is preferably formed in an end section of a clamping piece located away from the pivot axis.

[0030] If, during normal operation of the motor unit, the rotating part undergoes a rotational movement, the clamping pieces rotate together with the rotating part around its axis of rotation. Simultaneously, the clamping pieces pivot relative to the rotating part around their own pivot axis, due to the guidance of the control pins in the corresponding control cam of the control mechanism. Depending on the direction of rotation of the rotating part, either the first clamping pieces or the second clamping pieces, with their end sections located away from the pivot axis, are moved radially outwards relative to the rotating part, allowing the clamping pieces to engage in the corresponding receiving recesses of the coupling component.

[0031] According to a further feature of the invention, the control means is pivotably mounted on a sleeve body through which the motor shaft passes, forming a friction fit.

[0032] The design of the friction fit ensures that the control element does not rotate under frictional load when the rotating part rotates, but before the clamping pieces carried by the rotating part have reached their final position relative to the rotating part. Until this final position is reached, the control element remains stationary relative to the rotating part, which allows the clamping pieces to be guided along the associated control cam.

[0033] Once the clamping pieces have pivoted into their final position relative to the rotating part, they engage the control element, causing it to rotate along with the rotating part under the mechanical interposition of the clamping pieces. To enable this, the control element is rotatably mounted on the sleeve body. The friction fit between the bearing sleeve and the control element therefore does not prevent the control element from rotating along with the rotating part, but merely ensures that the clamping pieces rotate relative to the rotating part until they reach their final position as defined by the control guide.

[0034] The design of the aforementioned clutch allows for automatic clutch engagement as soon as the motor unit starts moving, shifting into either a first or second position depending on the motor unit's direction of rotation. When the motor unit starts moving, the rotating part of the clutch rotates, and this rotation also causes the clamping elements to rotate relative to the rotating part. Depending on the direction of rotation, either one clamping element or the other extends radially from the rotating part. Consequently, the clamping elements engage with the clutch part depending on the direction of rotation: in the first direction of rotation, the first clamping elements engage with the clutch part, and in the second direction of rotation, the second clamping elements engage with the clutch part.

[0035] If, despite the motor-driven opening or closing of the appliance door, manual assistance is provided by the user, the coupling part may rotate faster than the motor-driven rotating part, depending on the amount of manual force applied. This leads to automatic disengagement, as the clamping piece held in a recess is released from the recess when the coupling part rotates faster. Therefore, manual intervention by the user does not apply force to the motor unit, but rather results in automatic disengagement, since the positive locking between the clamping pieces and the coupling part is released when the coupling part rotates faster (i.e., at a higher speed) than the motor-driven rotating part of the coupling due to the manual intervention.

[0036] According to an advantageous embodiment, the coupling device has a second coupling designed as an overload coupling, for example as a claw coupling. This second coupling serves, particularly for safety reasons, to protect against pinching and overloading of the mechanical components and prevents door movement in the event of a blockage of the device door.

[0037] According to a further feature of the invention, the inner contour of the coupling part has four receiving recesses. When the device door is pivoted as intended, clamping elements engage in two of these receiving recesses. These are either the first two clamping elements or the second two clamping elements. Two of the receiving recesses, however, remain free.

[0038] According to an alternative embodiment, only two receiving recesses are provided. In the intended pivoting position of the device door, both recesses are occupied, either by the first two clamping pieces or by the second two clamping pieces, depending on the direction of rotation.

[0039] The advantage of the alternative embodiment is that it is less susceptible to re-engaging in the opposite direction, so that a disengagement process can be carried out over a larger rotation angle and is therefore safer.

[0040] Further features and advantages of the invention will become apparent from the following description with reference to the figures. These show Fig. 1 shows a purely schematic representation of a household appliance according to the invention, using a dishwasher as an example; Fig. 2 shows a schematic perspective view, partially showing the base of the dishwasher. Fig. 1; Fig. 3 in a further schematic representation of the machine base according to Fig. 2 Fig. 4 shows a schematic perspective view from the rear of a drive unit; Fig. 5 shows a schematic perspective view from the front of the drive unit. Fig. 4 ; Fig. 6 in schematic perspective view shows a section of the coupling device of the drive unit according to the Figs. 4 and 5 Fig. 7 shows a schematic top view of the coupling device according to Fig. 6 in a first position; Fig. 8 in schematic perspective view the coupling device according to Fig. 7 Fig. 9 shows a schematic top view of the coupling device according to Fig. 6 in a second position; Fig. 10 in schematic perspective view the coupling device according to Fig. 9 Fig. 11 shows a schematic top view of the coupling device according to Fig. 6 in a third position; Fig. 12 in schematic perspective view the coupling device according to Fig. 11Fig. 13 shows a schematic top view of the coupling device according to Fig. 6 According to an alternative embodiment and Fig. 14 in a schematic perspective view, the coupling device according to Fig. 13 .

[0041] Fig. 1 A purely schematic perspective representation shows a household appliance according to the invention, using a dishwasher 1 as an example.

[0042] The dishwasher 1 has a housing 3 that provides a compartment 4. In the illustrated embodiment, the housing 3 is enclosed within a casing 2 that serves as an outer housing.

[0043] The equipment compartment 4 provided by the device housing 3 is accessible for user access via a loading opening 5.

[0044] The dishwasher 1 also has a door 6 that is rotatable about a pivot axis and serves to close the loading opening 5. The door 6 can be moved from a closed position (closing the loading opening 5) to an open position and vice versa. Fig. 1 The device door 6 is shown in an open position, in which the loading opening 5 is partially open.

[0045] How in particular the Fig. 2 and 3 As can be seen, the device door 6 has a lever 12 arranged near the pivot axis. One lever 12 is provided on each side of the device door 6.

[0046] A force transmission means 9 is arranged at one end of a lever 12 in a manner known per se, which is guided over two rollers 10 and 11 and is arranged at the other end on a spring 8 of a spring mechanism 7.

[0047] When the device door 6 is manually opened by a user, the force transmission element 9, which is attached to a lever 12, is subjected to tensile stress, causing the spring 8 located at the other end of the respective force transmission element 9 to be tensioned. This tension stored in the spring 8 is released when the device door 6 is returned to the closed position, thus simplifying the closing of the device door 6. The design of such a spring-assisted device door 6 is known in the prior art, even with only one spring 8.

[0048] The dishwasher 1 further comprises a drive unit 13, which in turn includes a motor unit 14 and a coupling device 15. The drive unit 13 is operatively connected to the appliance door 6 and enables the appliance door 6 to pivot from an open position to a closed position that closes the loading opening 5, and vice versa. For this purpose, the motor unit 14 is operatively connected, via the coupling device 15, to the roller designed as a drive roller 11, which in turn is operatively connected to the power transmission means 9.

[0049] The Figs. 4 and 5 The drive unit 13 can still be seen in a perspective view.

[0050] As can be seen from the detailed view after Fig. 6As a result, the coupling device 15 has a coupling housing 17. This housing accommodates at least a first coupling 16 and, according to one embodiment, can also accommodate a second coupling of the coupling device 15, which is not shown in detail in the figures.

[0051] The first coupling 16 has a motor-driven rotating part 18 on one side and a coupling part 34 on the other. As will be described in more detail below, the rotating part 18 and the coupling part 34 interact when the coupling 16 is engaged. When the coupling 16 is disengaged, the coupling part 34 is free to rotate relative to the rotating part 18. Therefore, no power transmission takes place between the rotating part 18 and the coupling part 34 in the disengaged position.

[0052] The Figs. 7 to 12 The functionality of the inventive design can be seen in detail. The Figs. 7 and 8a first coupled position, which Figs. 9 and 10 a second coupled position and the Figs. 11 and 12 a disengaged position of the clutch 16. The coupled positions are automatically adjusted depending on the direction of rotation of the motor unit 11.

[0053] As can be seen in particular from a review of the Figs. 7 and 8 As a result, the rotating part 18 interacts with the motor shaft 19 of the motor unit 14 in a rotationally fixed manner. When the motor unit 14 is in operation, the rotating part 18 rotates, either clockwise or counterclockwise, depending on the direction of rotation of the motor shaft 19.

[0054] On the rotating part 18, first clamping pieces 20 and 21 and second clamping pieces 22 and 23 are pivotably arranged. A first clamping piece 20 and a second clamping piece 22 form a first rocker element 26, and a first clamping piece 21 and a second clamping piece 23 form a second rocker element 27. The rocker element 26 is rotatable about the pivot axis 24, and the second rocker element 27 is rotatable about the pivot axis 25 on the rotating part 18.

[0055] The coupling 16 also includes the coupling part 34. This part has an inner contour 32 facing the rotating part 18. This inner contour 32 provides receiving recesses 33 which, in operation, interact with the clamping pieces 20, 21, 22 and 23.

[0056] The motor shaft 19 passes through a sleeve body 30. This sleeve body is fixed and pivotably supports a control element 28, forming a friction fit. This control element 28 provides a control cam 29. In the illustrated embodiment, the control element 28 is designed as a bent wire.

[0057] Control pins 31 engage in the control cam 29; in the illustrated embodiment, these pins are provided by the second clamping pieces 22 and 23. The control pins 31 are located in the end section of the two clamping pieces 22 and 23 furthest from the pivot axis.

[0058] The construction described above enables the device door 6 to be moved from a closed position closing the loading opening to an open position and vice versa by means of the motor unit 14, depending on the direction of rotation of the motor unit 14, wherein the coupling 16 is designed to effect an automatic switching from the uncoupled position to a coupled position in the case of operation of the motor unit 14, wherein the coupling 16 assumes a first coupled position or a second coupled position depending on the direction of rotation of the motor unit 14.

[0059] The starting point for a motor-driven traversing movement of the device door 6 is the uncoupled position of the coupling 16, as can be seen from the Figs. 11 and 12This results in the following: In this uncoupled position, the clamping pieces 20 to 23 provided by the rotating part 18 do not interact with the inner contour 32 of the coupling part 34, thus allowing the coupling part 34 to rotate freely relative to the rotating part 18. In the uncoupled position, a manual rotation of the device door 6 by a user is therefore permitted.

[0060] If the user activates the motor unit 14 for a motor-driven rotation of the appliance door 6, the motor unit 14 rotates either counterclockwise or clockwise, depending on the direction of rotation. A counterclockwise rotation is indicated by the Figs. 7 and 8 and the Figs. 9 and 10 show a clockwise rotational movement.

[0061] As a result of a counterclockwise rotation of the motor unit 14, the rocker elements 26 and 27 pivot due to the guidance of the control pins 31 in the control cam 29 such that the respective second clamping pieces 22 and 23 move radially outwards with respect to the rotating part 18. In doing so, the clamping pieces rotate together with the rotating part 18 about the axis of rotation provided by the motor shaft 19. As a result of this movement, the second clamping pieces 22 and 23 engage in two opposing receiving recesses 33 of the coupling part 34, as shown in the Figs. 7 and 8 shown. As soon as the second clamping pieces 22 and 23 come into position in receiving recesses 33, a force transmission from the rotating part 18 to the coupling part 34 is possible, namely in a rotation direction counterclockwise.

[0062] If, however, the motor unit 14 is driven clockwise, the first clamping pieces 20 and 21, rather than the second clamping pieces 22 and 23, engage in the receiving recesses 33, as shown by the Figs. 9 and 10 This can be seen. In this case, force is transmitted to the coupling part 34 in the direction of rotation of the clockwise direction.

[0063] As described above, the clutch 16 engages automatically when the motor unit 14 is activated. The clutch is therefore disengaged when the motor unit 14 is not activated. Otherwise, the operation of the motor unit 14 also causes the clutch 16 to engage. Depending on the direction of rotation of the motor unit 14, this results in either a first engaged position, in which the first clamping pieces are in operative contact with the clutch part, or a second engaged position, in which the second clamping pieces are in operative contact with the clutch part. The clutch 16 is thus bidirectional and enables both motorized closing and motorized opening of the device door 6.

[0064] An alternative embodiment of the invention is shown by the Figs. 13 and 14According to this embodiment, instead of four receiving recesses 33, only two receiving recesses 33 are used. This design has the advantage that a larger rotation angle of the rotating part 18 is required to move the coupling 16 from an uncoupled position to a coupled position. This allows for more reliable differentiation between the individual positions of the coupling 16, in particular between the first coupled position and the second coupled position. However, a disadvantage compared to the embodiment shown in the previous figures is that, with the same dimensions, only a reduced torque can be transmitted. Reference sign

[0065] 1 Dishwasher 2 Enclosure 3 Appliance housing 4 Appliance compartment 5 Loading opening 6 Appliance door 7 Spring mechanism 8 Spring 9 Power transmission means 10 Deflection pulley 11 Drive pulley 12 Lever 13 Drive device 14 Motor unit 15 Coupling device 16 First coupling 17 Coupling housing 18 Rotating part 19 Motor shaft 20 First clamping piece 21 First clamping piece 22 Second clamping piece 23 Second clamping piece 24 Swivel axis 25 Swivel axis 26 Rocker element 27 Rocker element 28 Control means 29 Control cam 30 Sleeve body 31 Control pin 32 Inner contour 33 Receptacle 34 Coupling part

Claims

1. Household appliance, in particular a water-bearing household appliance, with an appliance housing (3) providing an appliance compartment (4) and having a loading opening (5) for access to the appliance compartment (4), with an appliance door (6) rotatably mounted about a pivot axis for closing the loading opening (5), with a motor unit (14) operatively connected to the appliance door (6), and with a coupling device (15) arranged between the motor unit (14) and the appliance door (6), which is operatively connected to the motor unit (14) on the drive side and to the appliance door (6) on the output side, wherein the coupling device (15) has a first coupling (16) which is switchable and can be moved from a disengaged position to a coupled position and vice versa. characterized by the fact thatThe device door (6) can be moved from a closed position closing the loading opening (5) to an open position and vice versa by means of the motor unit (14), depending on the direction of rotation of the motor unit (14), and the first coupling (16) is designed to effect an automatic switching from the uncoupled position to a coupled position when the motor unit (14) is in operation, wherein the first coupling (16) assumes a first coupled position or a second coupled position depending on the direction of rotation of the motor unit (14).

2. Household appliance according to claim 1, characterized by the fact that the first coupling (16) has a rotating part (18) arranged in a rotationally fixed manner on a motor shaft (19), which carries a first clamping piece (20, 21) arranged rotatably about a pivot axis (24, 25) and a second clamping piece (22, 23) arranged rotatably about a pivot axis (24, 25).

3. Household appliance according to claim 2, characterized by the fact thatthe first clamping piece (20, 21) and the second clamping piece (22, 23) form a rocker element (26, 27) and are designed to be rotatable about a common pivot axis (24, 25).

4. Household appliance according to claim 2 or 3, characterized by the fact that the rotating part (18) carries a further first clamping part (20, 21) arranged rotatably about a pivot axis (24, 25) and a further second clamping part (22, 23) arranged rotatably about a pivot axis (24, 25).

5. Household appliance according to claim 4, characterized by the fact that the further first clamping piece (20, 21) and the further second clamping piece (22, 23) form a further rocker element (26, 27) and are arranged to be rotatable about a common pivot axis (24, 25).

6. Household appliance according to any one of the preceding claims 2 to 5, characterized by the fact that the first clamping pieces (20, 21) and / or the second clamping pieces (22, 23) interact with a control cam (29) provided by a control means (28).

7. Household appliance according to claim 6, characterized by the fact that the control means (28) is rotatably mounted on a sleeve body (30) through which the motor shaft (19) passes, forming a friction fit.

8. Household appliance according to one of the preceding claims 6 or 7, characterized by the fact that the first clamping pieces (20, 21) and / or the second clamping pieces (22, 23) each carry control pins (31) located away from the pivot axis, which engage in the control cam (29) provided by the control means (28).

9. Household appliance according to any one of the preceding claims 2 to 8, characterized by the fact that the first coupling (16) has a coupling part (34) which at least partially receives the rotating part (18) and which has an inner contour (32) on the rotating part side which interacts with the clamping pieces (20, 21, 22, 23).

10. Household appliance according to claim 9, characterized by the fact thatthe inner contour (32) has receiving recesses (33) corresponding to the end sections of the clamping pieces (20, 21, 22, 23) located away from the pivot axis.

11. Household appliance according to claim 10, characterized by the fact that four receiving recesses (33) are provided.

12. Household appliance according to claim 10, characterized by the fact that two receiving recesses (33) are provided.

13. Household appliance according to one of the preceding claims, characterized by the fact that the coupling device (15) has a second coupling which is designed as an overload coupling.

Images