DE102017220150A1 - household 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 an operating element for a household appliance with a cylindrical control knob, which is rotatably disposed about a longitudinal axis of the control element, and with a hollow Bedienelementknopfaufnahme, in which the control knob hineinerstreckt at least partially, and which is circumferentially closed around the longitudinal axis, wherein the control element head from at least two separate parts is formed.

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 can be met, 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. It can the Torque transmission device be formed in one or more 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, two corresponding mating surfaces are preferably also 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 at least one of the torque transmission device at least partially receiving housing designed as a two-component injection molded part.

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.

• 1 zeigt eine schematische Ansicht einer Ausführungsform eines Haushaltsgeräts;
• 2 zeigt eine schematische Explosionsansicht einer Ausführungsform einer Bedienvorrichtung für das Haushaltsgerät gemäß 1;
• 3 zeigt eine schematische perspektivische Explosionsansicht der Bedienvorrichtung gemäß 2;
• 4 zeigt eine schematische Schnittansicht der Bedienvorrichtung gemäß 2;
• 5 zeigt die Detailansicht V gemäß 4;
• 6 zeigt eine schematische perspektivische Ansicht einer Ausführungsform einer Drehmomentübertragungseinrichtung für die Bedienvorrichtung gemäß 2;
• 7 zeigt eine weitere schematische perspektivische Explosionsansicht der Bedienvorrichtung gemäß 2;
• 8 zeigt eine schematische perspektivische Ansicht einer weiteren Ausführungsform einer Bedienvorrichtung für das Haushaltsgerät gemäß 1;
• 9 zeigt eine schematische Vorderansicht der Bedienvorrichtung gemäß 8;
• 10 zeigt eine schematische Schnittansicht der Bedienvorrichtung gemäß der Schnittlinie X-X der 9;
• 11 zeigt die Detailansicht XI gemäß 10;
• 12 zeigt eine schematische perspektivische Explosionsansicht der Bedienvorrichtung gemäß 8; und
• 13 zeigt eine schematische perspektivische Ansicht einer Ausführungsform einer Achshülse für die Bedienvorrichtung gemäß 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.

• 1 shows a schematic view of an embodiment of a household appliance;
• 2 shows a schematic exploded view of an embodiment of an operating device for the household appliance according to 1 ;
• 3 shows a schematic exploded perspective view of the operating device according to 2 ;
• 4 shows a schematic sectional view of the operating device according to 2 ;
• 5 shows the detail view V according to 4 ;
• 6 shows a schematic perspective view of an embodiment of a torque transmitting device for the operating device according to 2 ;
• 7 shows a further schematic exploded perspective view of the operating device according to 2 ;
• 8th shows a schematic perspective view of another embodiment of an operating device for the household appliance according to 1 ;
• 9 shows a schematic front view of the operating device according to 8th ;
• 10 shows a schematic sectional view of the operating device according to the section line XX the 9 ;
• 11 shows the detail view XI according to 10 ;
• 12 shows a schematic exploded perspective view of the operating device according to 8th ; and
• 13 shows a schematic perspective view of an embodiment of an axle sleeve for the operating device according to 8th ,

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

1 shows a schematic view of a household appliance 1 , The household appliance 1 is in particular a household cooking appliance, such as an electric cooker or a gas stove. The household appliance 1 However, it 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 for example, for storing and preserving food, such as a refrigerator or a freezer or a combined refrigerated freezer. Likewise, the household appliance 1 also be another household cooking appliance, such as a Mikrowellengargerät or Dampfgargerät.

The household appliance 1 includes a housing 2 on which a door 3 hinged hinged. The door 3 can a handle 4 include. Through the door 3 can be a receiving space for food in which they can be prepared, be closed. The household appliance 1 also includes an operating and display device 5 , The operating and display device 5 includes a display unit 6 For example, an LCD display, and a plurality, for example two, operating devices 7 , The number of operating devices 7 is however arbitrary. For example, with the help of any operating device 7 in each case a temperature of a stove or a baking oven of the household appliance 1 be set. The display unit 6 and the controls 7 are on a control panel 8th of the household appliance 1 assembled.

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

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

The operating device 7 includes next to the control element 9 a housing 12 in which the control element 9 at least partially recorded. The housing 12 is preferably a plastic injection molded component. The housing 12 points, as in the 4 shown, a preferably rotationally symmetrical to the axis of rotation D trained recording section 13 on, the torque transmission device 14 receives. The torque transmitting device 14 is preferably formed as a plastic injection molded component. In particular, the housing 12 and the torque transmitting device 14 formed as separate components, however, which are manufactured in a Montagespritzgussverfahren, in particular in a two-component injection molding process, such that the torque transmission device 14 in the case 12 taken and around the axis of rotation D is rotatably mounted. The torque transmitting device 14 has a cylindrical base portion 15 on that in the receiving section 13 of the housing 12 is included.

Furthermore, the torque transmission device comprises 14 a receiving section 16 for receiving the actuating shaft 11 , The actuating shaft 11 is doing so in the receiving section 16 recorded that the torque transmitting device 14 non-rotatable with the actuating shaft 11 connected is. This can be achieved, for example, by the fact that on the actuating shaft 11 a lateral flattening is provided into which the receiving portion 16 positively engages. A positive connection is created by the meshing or engaging behind at least two connection partners, in this case the receiving portion 16 the torque transmitting device 14 and the actuating shaft 11 ,

To the base section 15 closes an annular around the torque transmission device 14 circumferential groove 17 on. In this annular circumferential groove 17 intervenes in the receiving section 13 of the housing 12 protruding engaging portion 18 a positive fit. As a result, the torque transmission device 14 linear along the axis of rotation D set and can be around the rotation axis D to be turned around. A to the groove 17 subsequent circumferential collar 19 the torque transmitting device 14 lies on the front side of the engagement portion 18 on.

The operating device 7 further includes a knob 20 wherein the torque transmitting device 14 along the axis of rotation D considered between the knob 20 and the actuating shaft 11 is arranged. The knob 20 is non-rotatable with the torque transmitting device 14 connected. That is, with the aid of the torque transmission device 14 can from the knob 20 on the actuating shaft 11 a torque M ( 3 ) for operating the operating element 9 be transmitted. The torque M can be oriented in clockwise or counterclockwise direction. The knob 20 includes a tubular receiving portion 21 in which the torque transmission device 14 at least partially receivable. On the inside circumferentially on the receiving portion 21 is as a ring around the receiving portion 21 circumferential engagement section 22 provided in the form of a bridge. Preferably, there are two such engagement sections 22 . 23 , in particular a first engagement section 22 and a second engaging portion 23 , intended.

The torque transmitting device 14 includes to the engaging portions 22 . 23 corresponding counter-engagement sections 24 . 25 , They are a first counter-engagement section 24 and a second counter-engagement section 25 intended. The counter-engagement sections 24 . 25 are each as annular around the torque transmitting device 14 circumferential groove formed. Here are the engagement sections 22 . 23 adapted to form-fit in the counter-engagement sections 24 . 25 intervene to the knob 20 positively with the torque transmitting device 14 connect to. Here are the engagement sections 22 . 23 and the counter-engagement sections 24 . 25 designed such that a Aufsteckkraft F on ( 4 ) for attaching the knob 20 on the torque transmitting device 14 less than a withdrawal force Fab to remove the knob 20 from the torque transmitting device 14 is.

That the Aufsteckkraft F on less than the withdrawal force Fab is, can by a suitable geometric configuration of the engaging portions 22 . 23 and the counter-engagement sections 24 . 25 be achieved. For this purpose, the respective engagement section 22 . 23 , like in the 5 shown one at a first angle of inclination α1 to the rotation axis D the actuating shaft 11 inclined first annular contact surface 26 and the respective mating engagement portion 24 . 25 one at a second angle of inclination α2 to the rotation axis D inclined second contact surface 27 on. The first contact surface contacts 26 the second contact surface 27 when removing the knob 20 from the torque transmitting device 14 , The tilt angle α1 . α2 are preferably the same size. Alternatively, the angle of inclination α1 . α2 also be different in size, so the trigger force Fab can be set arbitrarily.

The respective engagement sections 22 . 23 have the first contact surface 26 turned away and along the axis of rotation D looks closer to the control 9 arranged first radius surface 28 on. The corresponding counter-engagement section 24 . 25 has accordingly one of the second contact surface 27 away and along the axis of rotation D looks closer to the control 9 arranged second radius surface 29 on. radii R28 . R29 the two radius surfaces 28 . 29 are preferably the same size. The radii R28 . R29 however, they can be different in size.

The torque transmitting device 14 includes at least one, but preferably two flat torque transmission surfaces 30 . 31 ( 6 ), and the knob 20 has at least one, but preferably two to the torque transmission surfaces 30 . 31 the torque transmitting device 14 corresponding flat counter surfaces 32 . 33 ( 3 ) on. For transmitting the torque M from the knob 20 on the torque transmitting device 14 are the torque transmission surfaces 30 . 31 at the corresponding mating surfaces 32 . 33 on.

The torque transmission surfaces 30 . 31 are preferably spaced apart from each other and positioned parallel to each other. Likewise, the counter surfaces 32 . 33 spaced from each other and positioned parallel to each other. At least one of the Torque transfer surfaces 30 . 31 , For example, the torque transmission surface 30 , is with the help of a slot 34 slotted. One on the corresponding counter surface 32 provided bridge 35 engages positively in the slot 34 on. This can cause incorrect assembly of the knob 20 be prevented.

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

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

The aforementioned control 9 is in the 8th to 12 Not shown. The operating device 7 includes a two-part housing 12 that from an upper shell 37 and a lower shell 38 may be formed, which are clipped together. In the case 12 can also be the control 9 be arranged. The operating device 7 furthermore does not comprise a one-piece but a two-part torque transmission device 14 holding an axle 39 , the rotation with the actuating shaft 11 connected, and one on the axle 39 attached axle sleeve 40 having. This is the axle element 39 non-rotatable with the actuating shaft 11 connected, and a previously described as rotary knob 20 the operating device 7 is non-rotatable with the axle sleeve 40 connected. The axle element 39 includes a rack on the top 41 , in which a rotational damper, not shown, positively engages.

The rack 41 is averted on the axle 39 a guide groove on the underside 42 intended. The guide groove 42 can be part of a slide tour. This link guide also includes a sliding block 43 in the axle sleeve 40 can be stored and in the guide groove 42 intervenes. The guide groove 42 can be heart-shaped. The axle element 39 further comprises a receiving portion 16 ( 10 ) for receiving the actuating shaft 11 and a receiving section 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 between the axle 39 and the axle sleeve 40 arranged. The axle sleeve 40 for this purpose comprises a receiving section 46 in which the spring element 45 is included.

The axle sleeve 40 can along a rotation axis as described above D relative to the axle element 39 be relocated. This allows the knob 20 in the case 12 be sunk. With the help of the rotary damper, not shown, an extension of the knob 20 be steamed out of the case. The axle element 39 can have two bars 47 ( 12 ), with the help of the axle 39 linear at the axle sleeve 40 is guided. The axle sleeve 40 can have corresponding grooves for this purpose. The axle sleeve 40 also has two torque transmitting surfaces 30 . 31 ( 13 ) on which corresponding mating surfaces 32 . 33 on the knob 20 assigned. The counter surfaces 32 . 33 are in the 8th to 12 Not shown. The counter surfaces 32 . 33 However, they are analogous to those in the 3 shown knob 20 intended.

Furthermore, the knob includes 20 an engaging portion 48 ( 11 ) and the axle sleeve 40 a corresponding counter-engagement section 49 in which the engaging section 48 positively engages. The engaging section 48 and the counter-engagement section 49 are not designed as annular grooves or annular webs, but on the Achshülse 40 is a perpendicular to the torque transmitting surface 30 . 31 arranged surface 50 ( 13 ) intended. Out of this area 50 extend two parallel to each other and spaced apart webs 51 . 52 out of the formed as a groove counter-engaging portion 49 to be interrupted.

Analogous to the illustration according to 5 includes the engagement portion 48 , like in the 11 shown a first contact surface 53 , and the counter-engagement section 49 includes a corresponding second contact surface 54 , Accordingly, the engagement portion comprises 48 a first radius surface 55 , and the counter-engagement portion includes a second radius surface corresponding thereto 56 , tilt angle α1 . α2 the contact surfaces 53 . 54 are preferably the same size. radii R55 . R56 the radius surfaces 55 . 56 are preferably the same size.

Due to the use of the engaging portion 22 . 23 . 48 and the corresponding counter-engagement section 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 attachment force F on and the withdrawal force Fab can through a better tuning of the respective counter-engagement section 24 . 25 . 49 and the engaging portion 22 . 23 . 48 be better coordinated. The fluctuation of the withdrawal force Fab can be much better limited at operating temperature. It is thus a process-reliable size and consistency of the withdrawal force Fab to reach.

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

LIST OF REFERENCE NUMBERS

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

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 2620831 A2 [0003]
• DE 102012224126 A1 [0004]
• EP 1385076 A1 [0005]
• EP 2980672 A2
• DE 102008042826 A1 [0007]

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). Household appliance after Claim 1 characterized in that the engagement portion (22, 23, 48) has a first contact surface (26, 53) inclined at a first inclination angle (a1) to a rotation axis (D) of the operation shaft (11) and the counter engagement portion (24, 25, 49) ) has a second contact surface (27, 54) inclined at a second angle of inclination (a2) to the axis of rotation (D), wherein the first contact surface (26, 53) covers the second contact surface (27, 54) when the rotary knob (20) is pulled off. contacted by the torque transmitting device (14). Household appliance after Claim 2 , characterized in that the first inclination angle (a1) and the second inclination angle (α2) are equal. Household appliance after Claim 2 or 3 , characterized in that the engagement portion (22, 23, 48) one of the first contact surface (26, 53) facing away and along the axis of rotation (D) closer to the control element (9) arranged first radius surface (28, 55) and the mating engagement portion (24, 25, 49) facing away from the second contact surface (27, 54) and along the axis of rotation (D) viewed closer to the operating element (9) arranged second radius surface (29, 56). Household appliance after 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. Household appliance according to one of Claims 1 - 5 characterized in that the torque transmitting means (14) comprises at least one planar torque transmitting surface (30, 31) and the rotary knob (20) at least one planar counterface (32, 33) corresponding to the at least one torque transmitting surface (30, 31) at which the at least one torque transmitting surface (30, 31) for transmitting the torque (M) from the rotary knob (20) to the torque transmitting device (14) is applied. Household appliance after Claim 6 , characterized in that the at least one torque transmission surface (30, 31) has a slot (34) and the at least one mating surface (32, 33) has a web (35) which engages positively in the slot (34). Household appliance according to one of Claims 1 - 7 , characterized in that the engagement portion (22, 23) is a ring around the rotary knob (20) circumferential web and the counter-engagement portion (24, 25) is an annular around the torque transmitting device (14) circumferential groove. Household appliance according to one of Claims 1 - 8th , characterized in that the torque transmission device (14) together with the torque transmitting device (14) at least partially receiving housing (12) is designed as a two-component injection-molded component. Household 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 (39) and linearly displaceable to this Achshülse (40), wherein the axle (39) rotatably with the actuating shaft (11) and the Rotary knob (20) rotatably connected to the axle sleeve (40) is connected. Household appliance after Claim 10 , characterized in that the rotary knob (20) by means of a linear displacement of the axle sleeve (40) relative to the axle element (39) at least in sections in a housing (12) is retractable. Household appliance after Claim 10 or 11 , characterized in that the counter-engagement portion (49) is provided on the axle sleeve (40). Household appliance after Claim 12 , characterized in that the axle sleeve (40) has a flat surface (50) with at least one web (51, 52) extending out of the surface (50), wherein the counter-engagement portion (49) is provided on the at least one web (51, 51). 52) provided groove is. Household appliance after Claim 13 , characterized in that two spaced-apart and mutually parallel webs (51, 52) are provided. Household appliance according to one of Claims 1 - 14 , characterized in that the actuating shaft (11), the rotary knob (20) and the torque transmitting device (14) are formed as separate components.

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