Household appliance

Description

[0001] The invention relates to a household appliance, in particular a water-bearing household appliance, such as a dishwasher, with an appliance housing providing an appliance compartment, which has 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 by means of which the appliance door can be moved from an open position to a closed position that closes the loading opening, and with a spring mechanism that serves to counterbalance the weight of the appliance door and which has a spring element and a force transmission means arranged between the spring element and the appliance door, which is in operative connection with an intermediate element that can be driven by the motor unit.

[0002] Household appliances in general, and water-bearing household appliances in particular, are well known from the prior art, which is why a separate printed reference is not fundamentally necessary here. Therefore, reference is made only by way of example to EP 3 875 017 A1 and DE 10 2017 218 493 A1, which each disclose 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-bearing household appliance, such as a dishwasher, a washing machine and / or a dryer. However, the term "household appliance" also includes refrigerators, ovens, steam cookers, microwaves and / or the like.

[0004] A household appliance of this type has a housing that provides a storage compartment. The housing has a loading opening to allow user access to this compartment. A door is provided to close the loading opening when the appliance is in use. This door is pivotally mounted on the housing around a preferably horizontal axis. Under normal operating conditions, the user can move the door from an open position to a closed position that closes the loading opening, and vice versa.

[0005] In the case of a water-bearing household appliance, the closure of the loading opening by the appliance door in the closed position is preferably fluid-tight.

[0006] To simplify at least one pivoting movement of the appliance door from an open position to a closed position that closes the loading opening, it is known from DE 10 2017 218 493 A1, mentioned above, to use a motor unit that is operatively connected to the appliance door. 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 by the user, and this without any further manual intervention by the user.

[0007] The design, previously disclosed in DE 10 2017 218 493 A1, features a spring mechanism, known per se, which serves to counterbalance the weight of the appliance door. This spring mechanism comprises a spring element on one side and a force transmission means on the other.

[0008] The spring element is designed as a coil spring and is hinged to the device housing at one end. At the other end of the spring element, the force transmission means is arranged; in the case of DE 10 2017 218 493 A1, this is a cable. The end of this cable opposite the spring element is connected to the device door, for which purpose the device door has a lever to which the cable is attached at one end. Two pulleys are also provided, around which the cable is guided.

[0009] A dishwasher with a spring mechanism that serves to counterbalance the weight of its door and includes a spring element and a force transmission means arranged between the spring element and the door is also known from US 2004 / 113531 A1. The motor unit provided according to DE 10 2017 218 493 A1 drives one of the two pulleys around which the cable of the spring mechanism is wound. A frictional connection exists between the pulley on the one hand and the cable on the other, which is maintained in all possible positions of the door by the spring element of the spring mechanism acting on the cable, thus ensuring that the cable is guided tightly around the pulley.

[0010] A comparable design is known from DE 10 2017 218 501 A1. According to this design, a motor-driven deflection pulley is also used, around which the cable is guided. The deflection pulley interacts with an auxiliary pulley, around which another cable is guided, interacting with the spring element of the spring mechanism. According to this design, the cable interacting with the device door is kept under tension by the fact that the other cable, which is guided around the auxiliary pulley, is connected to the spring element, and a frictional connection is formed both between the cable on the spring element side and the auxiliary pulley, and between the cable on the device door side and the deflection pulley.

[0011] In the intended operating conditions of the motor unit, the frictional engagement between the deflection pulley and the cable, as in both DE 10 2017 2018 493 A1 and DE 10 2017 218 501 A1, causes the deflection pulley, set in rotation by the motor unit, to exert a tensile load on the cable on the door side, resulting in the door pivoting towards its closed position. This design offers the advantage of pinch protection, as the motor-driven pulley can rotate freely if the door becomes blocked, thus preventing slippage between the deflection pulley and the cable.

[0012] However, a disadvantage of this previously known design is that the pinch protection achieved with it is very imprecise with regard to its triggering moment and, moreover, its function depends on the position of the device door.

[0013] To address this problem, both EP 3 875 017 A1 (also mentioned at the beginning) and DE 10 2021 100 347 A1 propose that the power transmission element and the intermediate link engage positively. According to EP 3 875 017 A1, this is achieved in particular by using a toothed belt, chain, and / or the like as the power transmission element and a corresponding gear as the intermediate link. In contrast to DE 10 2017 218 493 A1 and DE 10 2017 218 501 A1, EP 3 875 017 A1 thus employs a power transmission element and an intermediate link that engage positively rather than frictionally. The positive locking mechanism offers the advantage of preventing slippage between the power transmission element and the intermediate member, which would depend on the door position and / or the preload.The design proposed according to EP 3 875 017 A1 therefore makes it possible to move the appliance door safely and independently of the door weight and door position over the entire swing range.

[0014] Although the design known from EP 3 875 017 A1 has proven itself in everyday practical use, it is not without disadvantages. It has been found that, due to manufacturing tolerances, the intermediate element interacting with the power transmission element cannot always be precisely aligned with it. In particular, in the case of an intermediate element designed as a deflection pulley, tolerances prevent the manufacturer from always ensuring that the pulley's axis of rotation is free from any unintended misalignment relative to the power transmission element. In intended use, such misalignment leads to increased wear on the positively interlocking flanks or teeth of both the power transmission element and the intermediate element.Unwanted defects and / or noise developments are a detrimental consequence, which is why there is a desire for improvement.

[0015] Based on this, it is the Task The invention is to constructively further develop a generic household appliance in such a way that, while maintaining functionality, improved usability by a user is ensured over time.

[0016] To Solution The invention proposes a household appliance with the features of claim 1 to address this problem.

[0017] In contrast to the aforementioned prior art, a power transmission element and an intermediate element are used that interact both positively and non-positively. This is achieved by using a rope as the power transmission element, with a central section attached to the intermediate element. The rope is connected to the device door at one end and to the spring element at the other. As a result of this design, the rope is positively connected to the intermediate element, and a frictional connection is also achieved between the intermediate element and the rope because the rope is attached to the device door and the spring element at both ends, thus partially encircling the intermediate element during intended use.A particular advantage of this design is that it ensures reliable operation, as any slippage between the power transmission element and the intermediate link is avoided, and is also insensitive to misalignment of the intermediate link. Tolerance-related misalignments of the intermediate link and the power transmission element thus do not adversely affect the functionality of the inventive design. Furthermore, the inventive design offers a more cost-effective embodiment compared to the prior art, especially compared to purely positive-locking solutions such as toothed belts or chains.

[0018] Overall, the design according to the invention is much more robust compared to the prior art and therefore less prone to malfunctions in long-term operation, as it is less sensitive to tilting, especially of the intermediate element.

[0019] The design according to the invention represents a simple and therefore cost-effective construction that enables the device door to be moved safely over its entire pivoting range. Unwanted wear, particularly due to misalignment of the intermediate element relative to the force transmission means, is advantageously avoided, thus ensuring the durability of the design according to the invention. A further advantage is that the spring mechanism known from the prior art can be used unchanged. A cable is used as the force transmission means, which is arranged between the device door and the spring element of the spring mechanism. This cable is attached to the device door at one end and to the spring element at the other.For this purpose, the cable has corresponding end sections: a first end section associated with the appliance door and a second end section associated with the spring element. A central section of the cable, located between the two end sections, is also arranged on the intermediate link. Otherwise, the known design remains unchanged with regard to both the appliance door and the spring mechanism, so that retrofitting existing household appliances is also possible. The design according to the invention does not provide a purely frictional or purely positive connection, but rather a combined design of both a positive and a frictional connection. The advantages already detailed above result from this design.

[0020] According to the invention, the intermediate element is a pulley whose outer surface features a helically extending groove. The outer surface of the pulley is therefore not designed as a free surface, but rather a groove is provided that receives the rope during intended use. Unwanted friction losses, wear-related abrasion, and / or other obstructions to the rope during winding and unwinding onto the pulley are thus advantageously avoided, which contributes to the longevity of the inventive design. The groove provided by the pulley is helically shaped, i.e., in the form of a helix or screw, thus providing a continuous groove, with the individual 360° groove sections separated from one another by dividing or boundary walls.In particular, when winding the rope onto the pulley, this prevents sections of the rope from coming into direct contact with each other and rubbing against one another. The groove provided by the pulley thus serves as a clearly defined recess for the rope, which, as previously described, helps to prevent wear and tear on the rope, especially due to friction.

[0021] According to the invention, the groove provides a connecting contour designed to positively engage the rope with the pulley. In the design according to the invention, the intermediate element, which is designed as a pulley, is not only encircled by the rope but also positively coupled to it, for which purpose the rope is connected to the pulley in the region of its central section. The groove provided by the pulley has a connecting contour for this purpose. This groove is designed to positively engage the rope with the pulley. A permanently secure arrangement and connection of the rope's central section to the pulley is thus ensured.

[0022] According to a further feature of the invention, the connection contour is provided to be a radial recess of the groove into which a part of the central section of the rope engages.

[0023] According to this design alternative, the groove has a radial recess. In the final assembly state, part of the rope's central section projects into this radial recess. This creates the previously described positive locking mechanism, as the groove-side recess accommodates the rope, at least partially. By positioning part of the rope's central section within the groove-side recess, the rope is securely and precisely fixed in its position relative to the pulley.

[0024] According to a further feature of the invention, the portion of the rope's central section that engages in the groove's recess is designed in the form of a loop. This provides a remarkably simple construction for the positive locking of the rope to the pulley, which also allows for easy assembly and disassembly in case of repair. For proper assembly, it is sufficient to form a loop in the rope's central section by simply reshaping the rope. This loop is then inserted into the designated groove-side recess of the pulley for positive locking.

[0025] According to a further feature of the invention, the loop engages a securing element arranged on the pulley. This securing element advantageously ensures that the loop of the rope cannot unintentionally move out of the recess provided for this purpose in the pulley. Rather, the securing element fixes the loop in relation to the pulley by having the loop engage beneath the securing element, thereby reliably preventing the loop from moving out of the recess in a radial direction.

[0026] The locking element can, for example, be designed as a pin that engages in corresponding holes in the pulley. These holes are provided, for instance, by adjacent boundary walls of the groove on the pulley side. For proper installation, the loop of the rope is first inserted into the recess. Once this is done, the locking element, designed as a locking pin, is inserted into the corresponding holes in the boundary walls. The locking element protrudes through the loop, so that in the final assembly state, the loop encloses the locking element. As a result, the loop can no longer be moved radially out of the recess, as it is prevented from leaving the recess by the locking pin. This ensures a permanently secure arrangement of the rope on the pulley, while simultaneously allowing for easy disassembly, particularly in the event of a defect.

[0027] According to a second alternative, the connecting contour provides a corresponding counter contour to a thickening formed in the central section of the rope. The positive-locking connection between the pulley and the rope is formed, according to this alternative, by a thickening of the rope on the one hand and a corresponding counter contour of the pulley on the other. The thickening and the counter contour correspond to each other, thus ensuring the previously described positive locking between the rope and the pulley in the intended use.

[0028] According to a further feature of the invention, the counter contour has recesses provided by the boundary walls of the groove. In the intended use, the thickening of the rope lies in the recesses of the counter contour. The recesses are preferably designed as indentations provided by the boundary walls of the groove. Preferably, two recesses are provided, positioned opposite each other, each serving to partially accommodate the thickening. Through the interaction of the two recesses, the rope-side thickening is fixed in position and securely held on the rope pulley.

[0029] According to a further feature of the invention, the connection contour is formed in the longitudinal direction of the groove in the center of the groove.

[0030] The helical groove has a longitudinal direction, with the connecting contour being centered along this longitudinal direction. In the fully assembled state, the rope is thus positively locked in the center of the groove of the pulley, with its central section positively engaged. Therefore, the same amount of rope is available for winding in both directions, i.e., in both directions towards the first end section and in the other direction.

[0031] According to a further feature of the invention, it is provided that the rope, starting from the central section which is positively connected to the pulley, is arranged in the groove of the pulley, at least partially encircling the pulley, in the direction of the first end section and / or in the direction of the second end section.

[0032] With the device door fully open, the section of rope between the middle section and the first end section is almost completely unwound from the pulley. The other section of rope, however, is almost completely wound onto the pulley. When the device door is moved into a position that closes the loading opening, the part of the rope belonging to the first end section winds onto the pulley, while the other section of the rope unwinds to release the tension of the spring element that interacts with it. Therefore, when the device door is closed, the section of rope on the device door side is almost completely wound onto the pulley, while the section of rope on the spring element side is almost completely unwound from the pulley. According to a particular embodiment of the invention, the pulley is designed to have a diameter of approximately...1.3 turns are required to close the appliance door from a fully open position. The number of grooved turns of the pulley required for this is determined by the sum of the wrap angle and the angle of rotation of the pulley for the door movement. According to a geometry preferred in the invention, approximately 3 grooved turns are provided. When the appliance door is moved from one end position to another, the rope travels along the grooved turns of the pulley. The grooved turns of the pulley can run either clockwise or counterclockwise. The diameter of the pulley is advantageously selected such that the lever arm on the drive shaft of the motor unit is greater when the appliance door is closed and the spring element has a correspondingly lower spring force than when the appliance door is open and the spring element has a correspondingly higher preload.When a door is opened, the rope runs along the helical line of the groove of the pulley in the direction of the movement of the motor unit.

[0033] Particularly for reasons of reduced installation dimensions, it is preferred to use a pulley with the shortest possible axial length. To achieve this, it is preferable to select a thin rope. This can be a wire rope or a high-strength synthetic rope. Furthermore, if the entering and exiting rope position can be maintained within defined limits, it is also possible to omit the guiding boundary walls of the helical groove of the pulley, which further contributes to minimizing the axial dimensions of the pulley.

[0034] 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 schematic side view of a household appliance according to the invention, using a dishwasher as an example, with the appliance door in a partially open position; Fig. 2 shows a schematic side view, in part, of the dishwasher according to Fig. 1 Fig. 3 in schematic perspective detail view of the dishwasher according to the Figure 1 and 2 ; Fig. 4 shows a further schematic detail view of the dishwasher according to the Figure 1 and 2 Fig. 5 shows a further schematic detail view of the rope pulley according to the invention; Fig. 6 shows a schematic perspective view of the rope pulley according to the invention. Fig. 5 ; Fig. 7 in schematic perspective view the rope pulley after Fig. 6 with one of the ropes included; Fig. 8 shows a further view of the rope pulley. Fig. 7 ; Fig. 9 shows another view of the pulley. Fig. 7; Fig. 10 in a partially cutaway perspective view the pulley after Fig. 6 ; Fig. 11 in a partially cutaway perspective view the pulley after Fig. 10 with one of the ropes included; Fig. 12 shows another view of the rope pulley. Fig. 11 ; Fig. 13 shows a side view of the pulley. Fig. 11 Fig. 14 shows a schematic perspective view of the rope arranged on a pulley; Fig. 15 shows another view of the rope after Fig. 14 ; Fig. 16 in a partially cutaway perspective view the pulley according to the invention together with the rope it holds; Fig. 17 in a further view the pulley according to Fig. 16Fig. 18 shows a schematic perspective view of a rope 12 wound onto a pulley according to a second embodiment; Fig. 19 shows a schematic perspective view of a pulley with a rope held on it according to the second embodiment; Fig. 20 shows a partially cut-away side view of the pulley according to Fig. 19 and Fig. 21 in another view the pulley after Fig. 19 .

[0035] Fig. 1 A side view shows a household appliance according to the invention, using a dishwasher 1 as an example.

[0036] The dishwasher 1 has an outer casing (not shown in detail in the figures) which houses the appliance housing 2. The appliance housing 2 provides an appliance compartment 3, which is accessible via a loading opening 4.

[0037] The dishwasher 1 also has a door 5 that is rotatable about a pivot axis and serves to close the loading opening 4. The door 5 can be moved from a closed position (closing the loading opening 4) to an open position and vice versa. Fig. 1 The device door 5 is shown in an open position, in which the loading opening 4 is partially open.

[0038] As a synthesis of especially the Figures 1 to 4 As can be seen, the device door has a lever 29 arranged near the pivot axis (see, for example, Fig. 2 ). A lever 29 is provided on each side of the device door 5.

[0039] A rope 12 is arranged at one end of each lever 29, guided over a pulley 10 and a deflection pulley, and at the other end attached to a spring element 7 of a spring mechanism 6 located opposite the device housing 2. For this purpose, the rope 12 has a first end section 13 and a second end section 14, the first end section 13 being arranged on the lever 29 via a clevis 27 and the second end section being arranged on the spring element 7 via a clevis 28.

[0040] The deflection pulley 11 can be moved translationally in the direction of action of the spring element 7 by means of a clamping device 31 (see in particular Fig. 4 ), which allows manual adjustment of the preload of spring element 7.

[0041] When the device door 5 is manually opened by a user, the cable 12 attached to each lever 29 is subjected to tension, which causes the spring element 7 located at the other end of the respective cable 12 to tighten. This provides a counterbalance to the device door 5, preventing it from swinging down uncontrollably. The spring force stored in the spring elements 7 is released when the device door 5 is returned to the closed position, simplifying the closing of the device door 5. The cable 12 and the spring element 7 together form the spring mechanism 6.

[0042] The dishwasher 1 also has a motor unit 8 (see below). Fig. 1), which in the illustrated view is concealed by a sheet metal 9 of the machine base of the dishwasher 1. This motor unit 8 is operatively connected to the appliance door 5 and allows the appliance door 5 to be pivoted from an open position to a closed position by motor.

[0043] When the motor unit 8 is in operation, it drives the pulley 10. According to the invention, the pulley 10 is engaged with the rope 12 in both a positive and non-positive connection. Motor-driven rotation of the pulley 10 thus results in a tensile stress on the rope 12, which in turn exerts force on the device door 5, causing it to rotate clockwise towards the loading opening 4. Due to the positive connection between the pulley 10 and the rope 12, no slippage can occur, so that the device door 5 can be moved securely and independently of the door's weight and position over its entire swing range.

[0044] In order to allow the pulley 10 to rotate freely for the purpose of preventing pinching, despite the lack of slippage between the pulley 10 and the rope 12, a clutch, for example a slip clutch, is arranged between the motor unit 8 and the pulley 10, which prevents power transmission between the motor unit 8 and the pulley 10 when the device door 5 is subjected to a corresponding counter-load.

[0045] As can be seen in particular from a review of the Figures 5 and 6The outer surface 16 of the pulley 10, which acts as an intermediate element, provides a helically shaped groove 17. This groove 17 receives the rope 12, thus ensuring low-wear and reliable rope guidance. The helical groove 17 is divided into 360° sections, which are separated from each other axially by boundary walls 25. These boundary walls 25 ensure that the rope 12 received by the pulley 10 cannot rub against itself section by section, thereby advantageously preventing wear-related abrasion of the rope 12 to a large extent.

[0046] For the purpose of a positive-locking connection of the rope 12 to the pulley 10, the central section 15 of the rope 12, located between the first end section 13 and the second end section 14, is connected to the pulley 10 by means of a connecting contour 18. A first embodiment in this respect is shown in the Figures 10 to 17 , whereas the Figures 18 to 21 show a second embodiment.

[0047] According to the first embodiment, the connection contour 18 has a radially extending groove recess 19 into which a part of the central section 15 of the rope 12 engages, as can be seen in particular from a combination of the Figures 14 to 17 This can be seen. The part of the central section 15 of the rope 12 that engages in the recess 19 of the groove 17 is formed in the manner of a loop 20.

[0048] In its fully assembled state, the loop 20 engages a securing element 21 arranged on the rope pulley 10, which in the illustrated embodiment is designed as a locking pin.

[0049] For the positionally secure arrangement of the locking element 21 on the rope pulley 10, bores 32 formed in the boundary walls 25 serve in particular, into which the locking element 21 engages in the fully assembled state, as can be seen, for example, from a summary of the Figures 7 to 9 or 11 to 13 in particular.

[0050] In the fully assembled state of the locking element 21, the rope 12, with its loop 20 formed in the area of ​​the central section 15, is positively locked and held in position within the recess 19 on the pulley side. Due to the locking element 21, the loop 20 cannot unintentionally move radially out of the recess 19 of the rope pulley 10.

[0051] One alternative implementation option is derived from the Figures 18 to 21 As can be seen in this embodiment, the rope 12 is equipped with a thickening 23. In the final assembly state, this thickening engages in a counter contour 22 on the rope pulley side, wherein, in the illustrated embodiment, this counter contour 22 has two opposing recesses 24 formed in the associated boundary walls 25. In the final assembly state, as this can be seen, for example, from Fig. 19 This results in the thickening 23 of the rope 12 coming to lie in the recesses 24 of the counter contour 22 in a form-fitting manner, thus ensuring a positionally secure and precise arrangement of the rope 12 on the rope pulley 10.

[0052] As can be seen in particular from the presentation according Fig. 6This results in the connecting contour 18 being formed in the longitudinal direction 26 of the groove 17 in the center of the groove 17. It follows that the rope 12, starting from the central section 15 which is positively connected to the pulley 10, is arranged in the groove 17 of the pulley, at least partially encircling the pulley, in the direction of the first end section 13 and / or in the direction of the second end section 14, as is the case, for example, with the Figure 7 , 12 , 17 and 19 reveal themselves.

[0053] In its fully assembled state, as can be seen, for example, from the Figures 3 and 4As a result, opening the device door 5 causes the device door-side section of the rope 12 to unwind from the pulley 10, while the other part of the rope, namely the spring element-side section, winds onto the pulley 10. When the device door is closed, this arrangement is reversed; that is, the spring element-side section of the rope 12 unwinds from the pulley 10, while the device door-side section of the rope 12 winds onto the pulley 10. At all times, there is not only a frictional connection through the rope 12 wrapping around the pulley 10, but also a positive connection, because the central section 15 of the rope 12 is fixed to the pulley 10, as shown above, in particular by the Figures 7 to 21 This is explained using two alternative examples. Reference sign

[0054] 1 Household appliance (dishwasher) 2 Appliance housing 3 Appliance compartment 4 Loading opening 5 Appliance door 6 Spring mechanism 7 Spring element 8 Motor unit 9 Sheet metal 10 Pulley (intermediate link) 11 Deflection pulley 12 Cable (power transmission means) 13 First end section 14 Second end section 15 Middle section 16 Shell surface 17 Groove 18 Connection contour 19 Recess 20 Loop 21 Locking element 22 Counter contour 23 Thickening 24 Recess 25 Limit wall 26 Longitudinal direction 27 Fork head 28 Fork head 29 Lever 31 Tensioning device 32 Bore

Claims

1. Domestic appliance, in particular a water-conducting domestic appliance, comprising an appliance housing (2), which provides an appliance chamber (3) and has a loading opening (4) for access to the appliance chamber (3), comprising an appliance door (5), which is mounted so as to be rotatable about a pivot axis, for closing the loading opening (4), comprising a motor unit (8), by means of which the appliance door (5) can be transferred from an open position into a closed position that closes the loading opening (4), and comprising a spring mechanism (6), which acts as a counterbalance for the appliance door (5) and has a spring element (7) and a force transmission means, which is arranged between the spring element (7) and the appliance door (5) and is operatively connected to an intermediate member that can be driven by the motor unit (8), the force transmission means being a cord (12) which has a first end portion (13), a second end portion (14) and a central portion (15) arranged between the first end portion (13) and the second end portion (14), the cord (12) being arranged with its first end portion (13) on the device door (5), with its second end portion (14) on the spring element (7) and with its central portion (15) on the intermediate member, characterised in that the operative connection between the force transmission means and the intermediate member is both form-fitting and force-fitting, and in that the intermediate member is a cord pulley (10), the lateral surface (16) of which provides a helically extending groove (17), the groove (17) providing a connecting contour (18) which is designed to form-fittingly connect the cord (12) to the cord pulley (10).

2. Domestic appliance according to claim 1, characterised in that the connecting contour (18) is a radial depression (19) in the groove (17) into which a part of the central portion (15) of the cord (12) engages.

3. Domestic appliance according to claim 2, characterised in that the part of the central portion (15) of the cord (12) that engages in the depression (19) in the groove (17) is in the form of a loop (20).

4. Domestic appliance according to claim 3, characterised in that the loop (20) surrounds a securing element (21) arranged on the cord pulley (10).

5. Domestic appliance according to claim 1, characterised in that the connecting contour (18) provides a counter contour (22) corresponding to a thickening (23) formed in the region of the central portion (15) of the cord (12).

6. Domestic appliance according to claim 5, characterised in that the counter contour (22) has cavities (24) which are provided by delimiting walls (25) of the groove (17).

7. Domestic appliance according to any of the preceding claims, characterised in that the connecting contour (18) in the longitudinal direction (26) of the groove (17) is formed in the centre of the longitudinal groove (17).

8. Domestic appliance according to any of the preceding claims, characterised in that the cord (12) is arranged in the groove (17) of the cord pulley (10) so as to at least partially wrap around the cord pulley (10) in the direction of the first end portion (13) and / or in the direction of the second end portion (14), starting from the central portion (15) that is form-fittingly connected to the cord pulley (10).

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