EP3493016A1 - Domestic appliance - Google Patents

Abstract

The invention relates to a household appliance (1), in particular a Haushaltsgargerät, with an operating element (9) for operating the household appliance (1), wherein the operating element (9) comprises a rotatable actuating shaft (11) for actuating the operating element (9), a knob (20), and a torque transmitting means (14) disposed between the operating shaft (11) and the rotary knob (20) for transmitting a torque (M) from the rotary knob (20) to the operating shaft (11), the torque transmitting means (14) being non-rotatable is connected to the actuating shaft (11) and the rotary knob (20), wherein the rotary knob (20) has an engagement portion (22, 23, 48) and the torque transmission device (14) has a counter engagement portion (24, 25, 49), in which Engaging portion (22, 23, 48) engages positively, and wherein the engagement portion (22, 23, 48) and the counter-engagement portion (24, 25, 49) are formed such that a Aufsteckkraf t (Fauf) for attaching the rotary knob (20) to the torque transmitting device (14) is less than a withdrawal force (Fab) for removing the rotary knob (20) from the torque transmitting device (14).

Description

The present invention relates to a household appliance, in particular a Haushaltsgargerät.

Controls for household appliances, such as rotary switches or the like, comprise a rotatably mounted in a housing of the control element actuating shaft. At this operating shaft, a knob may be provided which is coupled, for example by means of a leaf spring with the actuating shaft.

The EP 2 620 831 A2 shows an operating element for a valve of a household appliance. The operating element comprises a gripping surface for gripping the operating element by a user and a coupling device for releasably coupling the operating element to a valve shaft of the valve, wherein the coupling device has a snap element, which is adapted to a corresponding element of the valve shaft in order to form a snap closure with it ,

The DE 10 2012 224 126 A1 describes a switch assembly for household appliances with a rotary switch, a knob and a fixing element for fixing the knob on a switching axis of the rotary switch. The fixing element is arranged between the indexing axis and the knob. The fixing element has a breakthrough, whereby it can be pushed onto the switching axis.

The EP 1 385 076 A1 shows a rotary switch device with a support member and a switch whose switch shaft is actuated via an actuator unit. To the support member, a shaft is molded, which is coupled in the assembled state with the switch shaft of the switch via a coupling point.

The EP 2 980 672 A2 shows a control element for a household appliance with a cylindrical control knob, which is rotatably mounted about a longitudinal axis of the control element, and with a hollow Bedienelementknopfaufnahme, in which the control knob at least partially hineinerstreckt, and which about the longitudinal axis is circumferentially closed, wherein the control element head receptacle is formed from at least two separate parts.

The DE 10 2008 042 826 A1 describes a domestic appliance actuating device with at least one bearing, which has at least one bearing body, and with at least one handle means and at least one coupling unit which couples the handle means with the bearing body, wherein the coupling unit is provided to fasten the handle means destructively releasable.

Against this background, an object of the present invention is to provide an improved home appliance.

Accordingly, a household appliance, in particular a Haushaltsgargerät proposed. The household appliance comprises an operating element for operating the household appliance, wherein the operating element comprises a rotatable actuating shaft for actuating the operating element, a rotary knob and a torque transmission device arranged between the actuating shaft and the rotary knob for transmitting a torque from the rotary knob to the actuating shaft, wherein the torque transmitting device rotatably with the operating shaft and the rotary knob is connected, wherein the rotary knob has an engagement portion and the torque transmitting device has a counter engagement portion in which the engagement portion engages positively, and wherein the engagement portion and the counter engagement portion are formed such that a Aufsteckkraft for attaching the knob to the torque transmitting device smaller than a withdrawal force for withdrawing the knob from the torque transmitting device is.

Characterized in that the rotary knob has the engaging portion and the torque transmitting device has the corresponding counter-engagement portion, the knob can be connected to the torque transmitting device in the sense of a tongue and groove connection. An additional component in the form of a leaf spring is therefore unnecessary. By a corresponding structural design of the engagement portion and the counter-engagement portion corresponding thereto, both the withdrawal force and the attachment force can be selectively influenced. As a result, appropriate requirements be maintained, which define the withdrawal force, the Aufsteckkraft and the difference of the two forces.

Preferably, the operating element, the rotary knob and the torque transmission device is part of an actuating device of the household appliance. The household appliance may comprise a plurality of such actuators. The operating element preferably comprises a base body in which the actuating shaft is rotatably mounted. For example, electronic components of the operating element can be provided in the base body. The control element may be, for example, a rotary switch, a potentiometer or the like or else a gas valve. The rotary knob is preferably a plastic component, in particular a plastic injection-molded component. The torque transmission device is preferably also a plastic component, preferably a plastic injection-molded component. In this case, the torque transmission device may be formed integrally or in several parts. Under the fact that the torque transmission device is arranged between the rotary knob and the actuating shaft, it is to be understood that the torque transmission device is arranged axially between the rotary knob and the actuating shaft viewed along an axis of rotation of the actuating shaft. The rotary knob is preferably a separate component from the torque transfer device.

According to one embodiment, the engagement portion has a first contact surface inclined at a first inclination angle to a rotation axis of the operation shaft and the counter engagement portion having a second contact surface inclined at a second inclination angle to the rotation axis, the first contact surface being the second contact surface upon withdrawal of the rotation knob from the torque transmission device contacted.

With the help of the configuration of the inclination angle thus the withdrawal force can be precisely defined. The first inclination angle and the second inclination angle may each be, for example, between 35 ° and 55 °, preferably between 40 ° and 50 °, more preferably 45 °. The first contact surface and the second contact surface can each rotate in an annular manner around the rotary knob and / or the torque transmission device. Alternatively, the first contact surface and the second contact surface may also be straight. According to a further embodiment, the first inclination angle and the second inclination angle are the same.

The first inclination angle and the second inclination angle may also be different. As a result, the withdrawal force can be set accurately.

According to a further embodiment, the engagement portion facing away from the first contact surface and viewed along the rotation axis closer to the control element disposed first radius surface and the mating engagement portion facing away from the second contact surface and viewed along the rotation axis closer to the control element disposed second radius surface.

The first radius surface and the second radius surface can each rotate in an annular manner around the rotary knob and / or the torque transmission device. Alternatively, the first radius surface and the second radius surface may also be straight.

According to a further embodiment, a radius of the first radius surface and a radius of the second radius surface are equal.

Alternatively, the radius of the first radius surface and the radius of the second radius surface may also be different in size.

According to a further embodiment, the torque transmission device has at least one flat torque transmission surface and the rotary knob has at least one planar counter surface corresponding to the at least one torque transmission surface against which the at least one torque transmission surface for transmitting the torque from the rotary knob rests on the torque transmission device.

In the present case, a flat surface is to be understood as an area which spans a plane. In particular, such a flat surface is not curved. Preferably, two such torque transmitting surfaces are provided, which are spaced from each other and arranged parallel to each other. Accordingly, they are also preferable two corresponding mating surfaces provided, which are spaced from each other and positioned parallel to each other.

According to a further embodiment, the at least one torque transmission surface has a slot and the at least one mating surface has a web which engages in a form-fitting manner in the slot.

That is, the web extends out of the mating surface toward the torque transmitting surface. In particular, the slot divides the torque transmitting surface into two surfaces. As a result, an incorrect installation of the rotary knob on the torque transmission device is not possible. As a result, a wrong assembly can be excluded.

According to a further embodiment, the engagement portion is an annular ring around the knob circumferential ridge and the counter-engagement portion is an annular encircling the torque transmitting device groove.

The web can be interrupted, for example, by the two opposing surfaces. In particular, the groove forming the counter-engagement section can also be interrupted in the region of the torque transmission surfaces.

According to a further embodiment, the torque transmission device is designed as a two-component injection-molded part, at least with a housing receiving the torque transmission device at least in sections.

Preferably, the torque transmission device and the housing accommodating these are produced in particular by means of a mounting injection molding process. That is, the torque transmitting device is rotatably accommodated to the housing.

According to a further embodiment, the torque transmission device has an axle element and a rotationally fixed to the axle and linearly displaceable to this axis sleeve, wherein the axle rotatably connected to the actuating shaft and the knob rotatably connected to the axle sleeve.

That is, in this case, the torque transmitting device is formed in two parts and includes the axle and the axle sleeve. The axle and the axle sleeve are preferably designed as plastic injection molded components. In particular, the axle is attached to the actuating shaft, and the axle sleeve is attached to the axle. A spring device can be provided between the axle sleeve and the axle element. Further, the axle member may also include a rack into which a rotary damper engages to dampen the linear movement of the axle sleeve relative to the axle. Furthermore, the axle together with a sliding block may also have a slotted guide. For this purpose, a groove for the sliding block is preferably provided on the axle. The groove can be heart-shaped.

According to a further embodiment, the rotary knob with the aid of a linear displacement of the axle sleeve relative to the axle element at least partially retractable in a housing.

That is, the knob can be pressed into the housing, which is locked by means of the aforementioned link guide in the pressed state. Pressing the knob again releases the catch and the knob is pushed out of the housing with the help of the spring element. The rotary damper dampens the movement of the rotary knob.

According to a further embodiment, the counter-engagement portion is provided on the axle sleeve.

The counter-engagement section in this case preferably runs perpendicular to the axis of rotation of the actuating shaft.

According to a further embodiment, the axle sleeve has a flat surface with at least one web extending out of the surface, wherein the counter-engagement section is a groove provided on the at least one web.

The surface is preferably arranged perpendicular to the at least one torque transmission surface. Preferably, the axle sleeve is rectangular in cross section. In particular, the groove breaks through the web.

According to a further embodiment, two spaced-apart and mutually parallel webs are provided.

The number of bars is arbitrary. It may also be only one web or it can be provided more than two webs. The webs preferably extend along the axis of rotation of the actuating shaft. The counter-engagement section preferably breaks through the two webs.

According to a further embodiment, the actuating shaft, the rotary knob and the torque transmission device are formed as separate components.

In particular, the axle and the axle sleeve are formed as separate components.

Further possible implementations of the household appliance also include combinations of features or embodiments which have not been explicitly mentioned above or described above with regard to the exemplary embodiments. The expert will also add individual aspects as improvements or additions to the respective basic form of the household appliance.

Fig. 1

zeigt eine schematische Ansicht einer Ausführungsform eines Haushaltsgeräts;

Fig. 2

zeigt eine schematische Explosionsansicht einer Ausführungsform einer Bedienvorrichtung für das Haushaltsgerät gemäß Fig. 1;

Fig. 3

zeigt eine schematische perspektivische Explosionsansicht der Bedienvorrichtung gemäß Fig. 2;

Fig. 4

zeigt eine schematische Schnittansicht der Bedienvorrichtung gemäß Fig. 2;

Fig. 5

zeigt die Detailansicht V gemäß Fig. 4;

Fig. 6

zeigt eine schematische perspektivische Ansicht einer Ausführungsform einer Drehmomentübertragungseinrichtung für die Bedienvorrichtung gemäß Fig. 2;

Fig. 7

zeigt eine weitere schematische perspektivische Explosionsansicht der Bedienvorrichtung gemäß Fig. 2;

Fig. 8

zeigt eine schematische perspektivische Ansicht einer weiteren Ausführungsform einer Bedienvorrichtung für das Haushaltsgerät gemäß Fig. 1;

Fig. 9

zeigt eine schematische Vorderansicht der Bedienvorrichtung gemäß Fig. 8;

Fig. 10

zeigt eine schematische Schnittansicht der Bedienvorrichtung gemäß der Schnittlinie X-X der Fig. 9;

Fig. 11

zeigt die Detailansicht XI gemäß Fig. 10;

Fig. 12

zeigt eine schematische perspektivische Explosionsansicht der Bedienvorrichtung gemäß Fig. 8; und

Fig. 13

zeigt eine schematische perspektivische Ansicht einer Ausführungsform einer Achshülse für die Bedienvorrichtung gemäß Fig. 8.

Further advantageous embodiments and aspects of the domestic appliance are the subject matter of the subclaims and the exemplary embodiments of the household appliance described below. In the following, the domestic appliance will be explained in more detail on the basis of preferred embodiments with reference to the enclosed figures.

Fig. 1

shows a schematic view of an embodiment of a household appliance;

Fig. 2

shows a schematic exploded view of an embodiment of an operating device for the household appliance according to Fig. 1 ;

Fig. 3

shows a schematic exploded perspective view of the operating device according to Fig. 2 ;

Fig. 4

shows a schematic sectional view of the operating device according to Fig. 2 ;

Fig. 5

shows the detail view V according to Fig. 4 ;

Fig. 6

shows a schematic perspective view of an embodiment of a torque transmitting device for the operating device according to Fig. 2 ;

Fig. 7

shows a further schematic exploded perspective view of the operating device according to Fig. 2 ;

Fig. 8

shows a schematic perspective view of another embodiment of an operating device for the household appliance according to Fig. 1 ;

Fig. 9

shows a schematic front view of the operating device according to Fig. 8 ;

Fig. 10

shows a schematic sectional view of the operating device according to the section line XX of Fig. 9 ;

Fig. 11

shows the detail view XI according to Fig. 10 ;

Fig. 12

shows a schematic exploded perspective view of the operating device according to Fig. 8 ; and

Fig. 13

shows a schematic perspective view of an embodiment of an axle sleeve for the operating device according to Fig. 8 ,

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

Fig. 1 shows a schematic view of a household appliance 1. The household appliance 1 is in particular a Haushaltsgargerät, such as an electric cooker or a gas stove. However, the household appliance 1 can also be designed, for example, for the care of items of laundry and, for example, be a washing machine or a tumble dryer. Likewise, the household appliance 1 may also be, for example, for storing and preserving food, for example a refrigerator or a freezer or a refrigerated combined freezer. Likewise, the household appliance 1 may also be another household cooking appliance, for example a microwave cooking appliance or a steam cooking appliance.

The household appliance 1 comprises a housing 2, on which a door 3 is hinged. The door 3 may comprise a handle 4. Through the door 3, a receiving space for food, in which they can be prepared, are closed. The domestic appliance 1 furthermore comprises an operating and display device 5. The operating and display device 5 comprises a display unit 6, for example an LCD display, and a plurality of, for example two, operating devices 7. The number of operating devices 7, however, is arbitrary. For example, with the aid of each operating device 7 in each case a temperature of a hotplate or a baking oven of the household appliance 1 can be set. The display unit 6 and the operating devices 7 are mounted on a control panel 8 of the household appliance 1.

The Fig. 2 shows a schematic exploded view of an embodiment of an operating device 7, the Fig. 3 shows a schematic exploded perspective view of the operating device 7, the Fig. 4 shows a schematic sectional view of the operating device 7, and the Fig. 5 shows the detail view V according to the Fig. 4 , The following is on the Fig. 2 to 5 simultaneously referred to.

The operating device 7 comprises an operating element 9 for operating the household appliance 1. For example, with the aid of the operating element 9, a temperature of a cooking plate or a baking oven of the household appliance 1 can be set. The operating element 9 may be, for example, a rotary switch, a potentiometer or a gas valve. The operating element 9 comprises a base body 10, which accommodates, for example, electronic components of the operating element 9. In the base body 10, an actuating shaft 11 is rotatably mounted. With the help of the actuating shaft 11, the operating element 9 can be actuated. The actuating shaft 11 may for example have a lateral flattening. However, the actuating shaft 11 may have any geometry in cross section. The actuating shaft 11 is about a rotation axis D relative to the base body 10 rotatable. The axis of rotation D can also be a middle or symmetry axis of the operating device 7.

The operating device 7 comprises, in addition to the operating element 9, a housing 12 in which the operating element 9 can be accommodated at least in sections. The housing 12 is preferably a plastic injection molded component. The housing 12 has, as in the Fig. 4 shown, a preferably rotationally symmetrical to the rotation axis D formed receiving portion 13 which receives a torque transmitting device 14. The torque transmission device 14 is preferably designed as a plastic injection molded component. In particular, the housing 12 and the torque transmission device 14 are formed as separate components, but in a mounting injection molding, in particular in a two-component injection molding, are made such that the torque transmitting device 14 is received in the housing 12 and rotatably supported about the rotation axis D. The torque transmitting device 14 has a cylindrical base portion 15 which is received in the receiving portion 13 of the housing 12.

Furthermore, the torque transmission device 14 comprises a receiving portion 16 for receiving the actuating shaft 11. The actuating shaft 11 is received in the receiving portion 16 so that the torque transmission device 14 is rotatably connected to the actuating shaft 11. This can be achieved, for example, by providing a lateral flattening on the actuating shaft 11 into which the receiving section 16 engages in a form-fitting manner. A positive connection is created by the meshing or engaging behind at least two connection partners, in this case the receiving portion 16 of the torque transmitting device 14 and the actuating shaft eleventh

The base section 15 is adjoined by a groove 17 running around the torque transmission device 14 in a ring shape. In this annular circumferential groove 17 engages a projecting into the receiving portion 13 of the housing 12 engaging portion 18 a form-fitting manner. As a result, the torque transmission device 14 is fixed linearly along the axis of rotation D and can be rotated about the axis of rotation D. A subsequent to the groove 17 circumferential collar 19 of the torque transmission device 14 is located on the front side of the engagement portion 18 at.

The operating device 7 furthermore comprises a rotary knob 20, wherein the torque transmission device 14 is arranged between the rotary knob 20 and the actuating shaft 11 viewed along the axis of rotation D. The knob 20 is rotatably connected to the torque transmitting device 14. That is, with the aid of the torque transmission device 14 can from the rotary knob 20 on the actuating shaft 11, a torque M ( Fig. 3 ) are transmitted to actuate the operating element 9. The torque M can be oriented in or counterclockwise. The rotary knob 20 includes a tubular receiving portion 21, in which the torque transmitting device 14 is at least partially receivable. On the inside circumferentially on the receiving portion 21 is provided as a ring around the receiving portion 21 encircling engagement portion 22 in the form of a web. Preferably, two such engagement portions 22, 23, in particular a first engagement portion 22 and a second engagement portion 23, are provided.

The torque transmission device 14 comprises counter engagement sections 24, 25 corresponding to the engagement sections 22, 23. A first counter engagement section 24 and a second counter engagement section 25 are provided. The counter-engagement portions 24, 25 are each formed as a ring around the torque transmitting device 14 circumferential groove. In this case, the engagement portions 22, 23 are adapted to positively engage in the counter-engagement portions 24, 25 in order to connect the knob 20 positively with the torque transmission device 14. Here, the engagement portions 22, 23 and the counter-engagement portions 24, 25 are formed such that a Aufsteckkraft Fauf ( Fig. 4 ) for attaching the knob 20 to the torque transmitting device 14 is less than a trigger force Fab for removing the knob 20 from the torque transmitting device 14.

That the Aufsteckkraft Fauf is smaller than the withdrawal force Fab, can be achieved by a suitable geometric configuration of the engagement portions 22, 23 and the counter-engagement portions 24, 25. For this purpose, the respective engagement portion 22, 23, as in the Fig. 5 shown, at a first inclination angle α1 to the rotation axis D of the actuating shaft 11 inclined first annular contact surface 26 and the respective mating engagement portion 24, 25 at a second inclination angle α2 inclined to the rotation axis D second contact surface 27. In this case, the first contact surface 26 contacts the second contact surface 27 at a withdrawal of the knob 20 of the torque transmitting device 14. The inclination angle α1, α2 are preferably the same size. Alternatively, the inclination angles α1, α2 can also be different in size, so that the withdrawal force Fab can be set arbitrarily.

The respective engagement sections 22, 23 face away from the first contact surface 26 and, viewed along the rotation axis D, have a first radius surface 28 arranged closer to the operating element 9. The corresponding counter-engagement section 24, 25 accordingly has a second radius surface 29 facing away from the second contact surface 27 and viewed closer to the control element 9 along the axis of rotation D. Radii R28, R29 of the two radius surfaces 28, 29 are preferably the same size. However, the radii R28, R29 can also be different sizes.

The torque transmission device 14 comprises at least one, but preferably two flat torque transmission surfaces 30, 31 (FIG. Fig. 6 ), and the rotary knob 20 has at least one, but preferably two to the torque transmission surfaces 30, 31 of the torque transmitting device 14 corresponding flat counter-surfaces 32, 33 (Fig. Fig. 3 ) on. In order to transmit the torque M from the rotary knob 20 to the torque transmission device 14, the torque transmission surfaces 30, 31 abut against the corresponding counter surfaces 32, 33.

The torque transmitting surfaces 30, 31 are preferably spaced apart from each other and positioned parallel to one another. Likewise, the mating surfaces 32, 33 are spaced apart from each other and positioned parallel to one another. At least one of the torque transmission surfaces 30, 31, for example the torque transmission surface 30, is slotted by means of a slot 34. A provided on the corresponding counter surface 32 web 35 engages positively in the slot 34 a. As a result, incorrect assembly of the knob 20 can be prevented.

As the Fig. 7 in a further schematic exploded view of the operating device 7, 8 openings or holes 36 are provided on the control panel, on each of which such an operating device 7 can be mounted.

The Fig. 8 shows a schematic perspective view of another embodiment of an operating device for the household appliance 1 according to Fig. 1 , The Fig. 9 shows a schematic front view of the operating device 7, the Fig. 10 shows a schematic sectional view of the operating device 7 according to the section line XX of Fig. 9 , the Fig. 11 shows the detail view XI according to the Fig. 10 , and the Fig. 12 shows a schematic exploded perspective view of the operating device 7. The following is on the 8 to 12 simultaneously referred to.

The aforementioned control element 9 is in the 8 to 12 Not shown. The operating device 7 comprises a two-part housing 12, which may be formed from an upper shell 37 and a lower shell 38, which are clipped together. In the housing 12 and the control element 9 may be arranged. The operating device 7 further comprises not a one-piece but a two-part torque transmission device 14, which has a shaft member 39 which is non-rotatably connected to the actuating shaft 11, and an axle sleeve 40 mounted on the axle 39. In this case, the shaft member 39 is rotatably connected to the actuating shaft 11, and as previously described rotary knob 20 of the operating device 7 is rotatably connected to the axle sleeve 40. The shaft member 39 includes the upper side of a rack 41, in which a rotational damper, not shown, positively engages.

The rack 41 facing away from the axle 39 on the underside a guide groove 42 is provided. The guide groove 42 may be part of a slotted guide. This slotted guide further comprises a sliding block 43, which may be mounted in the axle sleeve 40 and which engages in the guide groove 42. The guide groove 42 may be configured heart-shaped. The axle element 39 further comprises a receiving portion 16 (FIG. Fig. 10 ) for receiving the actuating shaft 11 and a receiving portion 44 for receiving a spring element 45. The spring element 45 is for example a cylinder spring, in particular a compression spring. The spring element 45 is arranged between the axle element 39 and the axle sleeve 40. The axle sleeve 40 for this purpose comprises a receiving portion 46, in which the spring element 45 is received.

The axle sleeve 40 can be displaced along a rotational axis D as described above relative to the axle element 39. In this way, the knob 20 can be sunk in the housing 12. With the help of the rotary damper, not shown, an extension the knob 20 are damped out of the housing. The axle element 39 can have two webs 47 (FIG. Fig. 12 ), by means of which the axle element 39 is guided linearly on the axle sleeve 40. The axle sleeve 40 may have corresponding receiving grooves for this purpose. The axle sleeve 40 also has two torque transmission surfaces 30, 31 (FIG. Fig. 13 ), which are associated with corresponding counter-surfaces 32, 33 on the knob 20. The mating surfaces 32, 33 are in the 8 to 12 Not shown. However, the mating surfaces 32, 33 are analogous to that in the Fig. 3 shown knob 20 is provided.

Furthermore, the rotary knob 20 comprises an engagement portion 48 (FIG. Fig. 11 ) and the axle sleeve 40 has a corresponding mating engagement portion 49, in which the engagement portion 48 engages positively. The engagement portion 48 and the counter-engagement portion 49 are not formed here as annular grooves or annular webs, but on the axle sleeve 40 is a perpendicular to the torque transmission surface 30, 31 arranged surface 50 (FIGS. Fig. 13 ) intended. Extending out of this surface 50 are two webs 51, 52 arranged parallel to one another and at a distance from one another, which webs are interrupted by the counter-engagement section 49 designed as a groove.

Analogous to the illustration according to Fig. 5 The engagement portion 48 includes as shown in FIG Fig. 11 As shown, the engagement portion 48 includes a first radius surface 55, and the mating engagement portion includes a second radius surface 56 corresponding thereto. Tilt angles α1, α2 of the contact surfaces 53, 54 are preferably the same size. Radii R55, R56 of the radius surfaces 55, 56 are preferably the same size.

Due to the use of the engagement portion 22, 23, 48 and the corresponding counter-engagement portion 24, 25, 49 can be dispensed with a leaf spring. This reduces the material and assembly costs. Even manufacturing conditions fluctuating tolerances of the leaf spring are no longer to be considered. The Aufsteckkraft Fauf and the pull-off force Fab can be better coordinated by better coordination of the respective mating engagement portion 24, 25, 49 and the engagement portion 22, 23, 48. The fluctuation of the pull-off force Fab can at operating temperature be narrowed much better. It is thus a process-reliable size and consistency of the peel force Fab to achieve.

Although the present invention has been described with reference to embodiments, it is variously modifiable.

Used reference signs:

1

household appliance

2

casing

3

door

4

handle

5

Operating and display device

6

display unit

7

operating device

8th

control panel

9

operating element

10

base body

11

actuating shaft

12

casing

13

receiving portion

14

Torque transfer device

15

base section

16

receiving portion

17

groove

18

engaging portion

19

Federation

20

knob

21

receiving portion

22

engaging portion

23

engaging portion

24

Against engaging section

25

Against engaging section

26

contact area

27

contact area

28

radius surface

29

radius surface

30

Torque transmitting face

31

Torque transmitting face

32

counter surface

33

counter surface

34

slot

35

web

36

drilling

37

Front Cover

38

subshell

39

axle

40

axle sleeve

41

rack

42

guide

43

sliding block

44

receiving portion

45

spring element

46

receiving portion

47

web

48

engaging portion

49

Against engaging section

50

surface

51

web

52

web

53

contact area

54

contact area

55

radius surface

56

radius surface

D

axis of rotation

F on

Plug force

Fab

off force

M

torque

R28

radius

R29

radius

R55

radius

R56

radius

α1

corner

α2

corner

Claims (15)

Domestic appliance (1), in particular Haushaltsgargerät, with a control element (9) for operating the household appliance (1), wherein the operating element (9) comprises a rotatable actuating shaft (11) for actuating the operating element (9), a knob (20), and a torque transmission device (14) arranged between the actuating shaft (11) and the rotary knob (20) for transmitting a torque (M) from the rotary knob (20) to the actuating shaft (11), the torque transmission device (14) being fixed in rotation with the actuating shaft (11 ) and the rotary knob (20), wherein the rotary knob (20) has an engaging portion (22, 23, 48) and the torque transmitting device (14) has a counter engaging portion (24, 25, 49) into which the engaging portion (22, 23 , 48) engages positively, and wherein the engagement portion (22, 23, 48) and the counter-engagement portion (24, 25, 49) are formed such that a Aufsteckkraft (Fauf) for attaching the Dre Hastens (20) on the torque transmitting device (14) is less than a withdrawal force (Fab) for removing the knob (20) from the torque transmitting device (14). Domestic appliance according to Claim 1, characterized in that the engagement section (22, 23, 48) has a first contact surface (26, 53) inclined at a first inclination angle (α1) to a rotation axis (D) of the actuation shaft (11) and the counter-engagement section (24 , 25, 49) has a second contact surface (27, 54) inclined at a second angle of inclination (α2) to the axis of rotation (D), wherein the first contact surface (26, 53) forms the second contact surface (27, 54) when the component is removed Rotary knob (20) of the torque transmitting device (14) contacted. Domestic appliance according to claim 2, characterized in that the first inclination angle (α1) and the second inclination angle (α2) are equal. Domestic appliance according to claim 2 or 3, characterized in that the engagement portion (22, 23, 48) facing away from the first contact surface (26, 53) and along the axis of rotation (D) closer to the control element (9) arranged first radius surface (28 , 55) and the counter - engaging portion (24, 25, 49) one of Having the second contact surface (27, 54) facing away and along the axis of rotation (D) considered closer to the operating element (9) arranged second radius surface (29, 56). Domestic appliance according to claim 4, characterized in that a radius (R28, R55) of the first radius surface (28, 55) and a radius (R29, R56) of the second radius surface (29, 56) are equal. Domestic appliance according to one of claims 1-5, characterized in that the torque transmission device (14) at least one flat torque transmission surface (30, 31) and the knob (20) at least one to the at least one torque transmission surface (30, 31) corresponding planar counter surface (32 , 33) on which the at least one torque-transmitting surface (30, 31) for transmitting the torque (M) from the rotary knob (20) rests on the torque-transmitting device (14). Domestic appliance according to claim 6, characterized in that the at least one torque transmission surface (30, 31) has a slot (34) and the at least one counter surface (32, 33) has a web (35) which engages positively in the slot (34). Domestic appliance according to one of claims 1-7, characterized in that the engagement portion (22, 23) an annular around the knob (20) circumferential ridge and the counter-engagement portion (24, 25) is an annular groove around the torque transmitting device (14). Domestic appliance according to one of claims 1-8, characterized in that the torque transmission device (14) together with a torque transmitting device (14) at least partially receiving housing (12) is designed as a two-component injection-molded component. Domestic appliance according to one of claims 1 - 6, characterized in that the torque transmission device (14) has an axle element (39) and a rotationally fixed to the axle element (39) and linearly displaceable to this axis sleeve (40), wherein the shaft member (39) rotatably connected to the actuating shaft (11) and the rotary knob (20) rotatably connected to the axle sleeve (40). Domestic appliance according to claim 10, characterized in that the rotary knob (20) by means of a linear displacement of the axle sleeve (40) relative to the axle (39) at least partially in a housing (12) is retractable. Domestic appliance according to claim 10 or 11, characterized in that the counter-engagement portion (49) on the axle sleeve (40) is provided. Domestic appliance according to claim 12, characterized in that the axial sleeve (40) has a flat surface (50) with at least one out of the surface (50) extending out web (51, 52), wherein the counter-engaging portion (49) one on the at least one Web (51, 52) provided groove is. Domestic appliance according to claim 13, characterized in that two spaced-apart and mutually parallel webs (51, 52) are provided. Domestic appliance according to one of claims 1-14, characterized in that the actuating shaft (11), the rotary knob (20) and the torque transmission device (14) are formed as separate components.

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