EP2921782B1 - Door for a domestic appliance with a cover for at least one door panel used as a hybrid component and household appliance having such a door - Google Patents

Description

The invention relates to a door for a household appliance with at least one plate-like door glass and a strip-shaped cover, which covers the door pane from above at least partially, and which is formed from at least two different materials. Furthermore, the invention relates to a household appliance, in particular a cooking appliance, with such a door.

Such doors are from the DE 10 2006 042 177 A1 and the EP 2 416 072 A1 known. Further, the EP 2 159 489 A2 a cooking appliance with a cooking appliance door and a method for producing such a cooking appliance door. The EP 2 469 190 A1 discloses a hob with an upper part and a base part. Finally, the reveals EP 0 947 776 A2 a cooking oven with a cooling device.

These top covers of the door are subject to functionally high requirements and are also exposed to a wide variety of operating conditions, so that they have to endure, for example, many different temperature influences and moisture differences permanently.

It is an object of the present invention to provide a door for a household appliance and such a household appliance, in which or in which the cover the requirements imposed on it takes into account.

This object is achieved by a door and a household appliance according to the claims.

A door according to the invention for a domestic appliance comprises at least one plate-like door pane and a strip-shaped cover which covers the door pane at least in places from above. The cover is formed of at least two different materials. An essential idea of the invention is to be seen in that the cover is designed as a hybrid component of at least the materials plastic and metal. A significant advantage of the invention is the fact that the individual individual areas can be formed very specific material specific material by such a hybrid component. This has significant advantages in the design of very complex shapes of the individual parts of this cover from the different materials. Especially the specified materials plastic and metal are in this context in view of the then to be accepted requirements very individual to design and train. The cover as a whole can thus be made very individual and needs-based in terms of their use and their use material. In addition, just by such a hybrid component at the interfaces to the at least two materials plastic and metal create a mechanically stable connection, so that here too durable durability is achieved and durable high stresses can be maintained.

It is provided that the cover has a core part or an inner part, which is formed of metal. This core part is at least partially encapsulated with the plastic. It can also be provided in this embodiment that different plastics are attached to different areas of the metal and in particular injection-molded, so that the advantages mentioned above stand out again. A very locally specified design of plastic materials on the core part is made possible.

In particular, it is provided in such an embodiment that the core part is brought as a metal insert in an injection molding device and is encapsulated with the plastic. It is provided here that the connection between the metallic core part and the region of the cover made of plastic is designed so that a relative movement due to, in particular, different material expansion of the two materials is made possible under the influence of heat. According to the invention it is provided that the core part is connected by a movable bearing and a fixed bearing with the at least one plastic and at least partially arranged quasi floating in the plastic. By such a particularly advantageous embodiment is then achieved that does not dissolve due to different linear expansion of both materials, a connection between the plastic and the metal. It is therefore provided in this preferred embodiment that the metal insert or the core part in the plastic part can slide to some extent.

In a further embodiment it is provided that the cover has a core part made of metal, which is at least partially surrounded and welded with at least one plastic. This connection can be made for example by a heat source, by which at least one of the two materials is heated so that welding is possible. Again, it is preferably provided that the connection is designed so that a relative movement between the materials is made possible. Again, a floating bearing and a bearing are thus provided to occur during operation of the household appliance, in particular a cooking appliance, and thus occurring heat input into the cover not undefined curvature in the assembly by the different linear expansion of the materials.

In a further advantageous embodiment, it is provided that the cover has a core part made of metal, which is non-destructively releasably connected, in particular snapped or crimped, with a wrapping part formed of plastic. Here, too, it is then preferably provided that the core part is connected to the plastic in such a way that a relative movement due to different material expansion under the influence of heat is made possible. Accordingly applies here, too, that a connection with a movable bearing and a fixed bearing is provided.

In particular, it is provided that in a further embodiment, the cover has a core part made of metal, which is glued to a plastic part formed envelope. Also, it is advantageous here if the thickness of the adhesive and thus the layer thickness and also in the material composition of the adhesive is chosen such that the different length expansions of the materials during operation of the household appliance allows a relative movement of the metal and the plastic, without the Adhesive connection is destroyed.

In a further advantageous embodiment, it is provided that the plastic has at least two different types with respect to the temperature resistance, and a first made of plastic portion of the hybrid component made of a plastic having a first temperature resistance and a second made of plastic portion of the hybrid component a plastic with a different first to the second Temperature resistance is formed. Thus it can be provided that at least a portion of the cover is formed of a high temperature resistant plastic. This is in particular that area which is exposed to high temperatures during operation of the domestic appliance, for example due to air currents or other factors. In particular, it is provided that with respect to the temperature in the operation of the household appliance further portion of the cover is formed of metal and a low in operation of the household appliance temperatures compared to the other temperatures exposed area is formed of a plastic with low temperature resistance.

It can be provided that the cover has a core part made of plastic, which is at least partially encapsulated with metal, in particular an IM (In-Mold) - or an IMD (In-Mold-Decoration) component is formed. In particular, in the case of components produced in such a specified manner, a foil, for example of stainless steel, is applied or back-injected onto the core part made of plastic. In this embodiment, a visible metallic surface is then produced, although the cover is not a solid mass component made of metal. However, a corresponding impression is conveyed by this.

It is preferably provided that a heat decoupling element is formed between the metal and the plastic. This may be, for example, a high-temperature-resistant plastic or a glass fiber seal or a Graphitzwischenlage or an elastomer. Preferably, it is provided that openings, for example, for carrying out air flows or slots in the core part, which is in particular made of metal, have been adapted to the muffle flange of the household appliance designed as a cooking appliance. This flange includes passages between the door and a suction channel. Preferably, a total cross section of the passages is formed with at least 2,000 mm ² . As a result, a corresponding air volume flow is achieved by the door through the metallic part of the cover and allows a corresponding extraction.

It is preferably provided that functional elements are integrated in the part of the hybrid component formed from plastic. This is particularly advantageous insofar as there is a multi-functionality of this material-specified portion of the cover is reached. In particular, it is provided that a functional element comprises a receptacle for a locking element for locking the door in a pyrolysis operation of a household appliance designed as a cooking appliance. Additionally or instead, it can be provided that a functional element is a stop for a door contact switch. In addition, it is provided that a functional element in addition to or instead of a snap hook for coupling the cover with another component of the door. In addition, it can be provided that a functional element in addition to or instead of a dome for power transmission. Another possible embodiment of a functional element may then be a locking device for the dissolution prevention of a front system, in particular a windscreen, of other components of the door. In an advantageous embodiment, it is provided that the metal of the hybrid component is a stainless steel, in particular a chromium steel 1.4016.

Advantageously, the cover is hood-like and has passage openings for air currents.

It is preferably provided that, with regard to the place of use and the possible influencing parameters, in particular temperature influences, a plastic, for example PBT or PET with glass fiber, is reinforced for a partial area of the cover. As the metal is preferably provided stainless steel. With regard to the functional elements, the passage openings mentioned can also be designed in such a way, in particular in terms of shape, number and position, in order to prevent accumulation of heat in the upper part of the cover towards the front pane and also to prevent air turbulence. As a result, the circulation for ventilating the door can be improved with several separate panes and a very locally targeted cooling of the panes can be achieved.

In addition, the insight into the door interior is prevented by the cover.

Furthermore, the invention relates to a household appliance, in particular a cooking appliance, with a door according to the invention. The door is in the context of closing a receiving space, in particular a cooking chamber formed.

Fig. 1

eine perspektivische Darstellung eines Ausführungsbeispiels eines erfindungsgemäßen Haushaltsgeräts;

Fig. 2

eine perspektivische Darstellung eines Ausführungsbeispiels einer Abdeckung gemäß einer Frontansicht;

Fig. 3

die Abdeckung gemäß Fig. 3 in einer Rückansicht;

Fig. 4

eine Teildarstellung der Ansicht gemäß Fig. 3;

Fig. 5

eine Teildarstellung eines Teilausschnitts der Abdeckung gemäß Fig. 2; und

Fig. 6

eine Längsschnittdarstellung eines Ausführungsbeispiels einer erfindungsgemäßen Tür in einem oberen Bereich, in dem eine Abdeckung angeordnet ist.

Embodiments of the invention are explained in more detail below with reference to schematic drawings. Show it:

Fig. 1

a perspective view of an embodiment of a household appliance according to the invention;

Fig. 2

a perspective view of an embodiment of a cover according to a front view;

Fig. 3

the cover according to Fig. 3 in a rear view;

Fig. 4

a partial view of the view according to Fig. 3 ;

Fig. 5

a partial view of a partial section of the cover according to Fig. 2 ; and

Fig. 6

a longitudinal sectional view of an embodiment of a door according to the invention in an upper region in which a cover is arranged.

In the figures, identical or functionally identical elements are provided with the same reference numerals.

In Fig. 1 is shown in a perspective view of a household appliance, which is designed as a cooking appliance, in particular as a baking oven 1. The oven 1 comprises a housing 2, in which a muffle 3 is arranged. The muffle 3 limits a cooking chamber 4, can be introduced into the food for cooking.

The cooking chamber 4 and in particular the muffle 3 are formed on the front side with a feed opening which can be closed by a door 5. In the exemplary embodiment, the door 5 comprises at least one front screen 6, on whose outer side 6a a door handle 7 is formed. The door 5 moreover comprises an inner pane which extends parallel to the front pane 6 and, when the door 5 is closed, is arranged closer to the cooking space 4. In addition, between the windscreen 6, which also represents the outer pane, and the inner pane 8 (FIG. Fig. 6 ) A first intermediate disc 9 and a second intermediate disc 10 is formed.

In addition, the oven 1 further comprises, by way of example, cooking zones 11, 12, 13 and 14. In addition, an operating device 15 with a display unit 16 and operating elements 17 and 18 is also formed in position and configuration by way of example only.

The door 5 further comprises a top panel or a top cover 19, as in a perspective view in Fig. 2 is shown. By this strip-shaped cover 19 at least some of the door windows are covered from above. The cover 19 is formed as a hybrid component of at least the materials plastic and metal. In Fig. 2 Here is an example shown, in which the cover 19 has a core part 20 made of metal, in particular stainless steel. The metal can also be chrome steel.

In the strip-shaped core part 20 through openings 21, 22 and 23 are formed, through which air flows from the door 5, as it is also in Fig. 6 is shown, can escape.

The cover 19 in its hybrid embodiment further comprises a plastic part 24. This plastic part 24 comprises an elongated strip 25, on whose opposite end end caps 26 and 27 are integrally formed. These end caps 26 and 27 also cover the core member 20 at the opposite ends, so that it is edged in this regard.

It can be provided that the core part 20 is encapsulated by the plastic. This can be done to the effect that the core member 20 is inserted into an injection mold and molded with the plastic site-specific, so that then the finished part according to Fig. 2 arises. In particular, it is provided that the connection between the core part 20 and the plastic part 24 is designed so that due to the different length expansions at a heat input, the connection is not solved, but permanently maintained. For this purpose, a loose and a fixed bearing are virtually formed so that the core member 20 in the plastic part 24 can slide to some extent and thus is arranged quasi floating therein.

As well as in Fig. 2 can be seen, 24 functional elements 29 are integrated in the plastic part. On the one hand, this is a receptacle 28 into which engages a locking element for locking the door 5 in a pyrolysis operation of the oven 1.

In addition, a further functional element 29 is provided. This functional element forms a stop for a door contact switch. This functional element 29 is thus prism-shaped and formed on a sloping flank 30 of the respective ends 26 and 27.

In addition, a further functional element 31 is provided in the embodiment. This downward, pin-like element, which tapers tip-like to its free end, represents a locking device. This thus prevents a release of the front system, in particular a windshield of the door. 5

In addition, the plastic part 24 comprises further functional elements 32, which are formed at the respective opposite ends 26 and 27 and also extend in the vertical direction downwards and thus extend in the negative y-direction. These functional elements 32 represent a dome for a transmission of occurring forces.

In addition, a further functional element 33 is integrated with the plastic part 24, which forms a snap hook for coupling the cover 19 with a further component of the door 5.

In Fig. 3 the cover 19 is shown in a rear view, whereas in Fig. 2 is shown in a front view.

In Fig. 4 is an enlarged view of the section I in Fig. 3 shown.

In Fig. 5 is an enlarged view of the section II in Fig. 2 shown. The respective more detailed embodiments of the various functional elements, as they are integrated in the end caps 26 and 27 of the plastic part 24 can be seen. In this case, the respective shapes and positions in the end caps 26 and 27 and their positional arrangement are shown to each other and their proportions to each other.

In Fig. 6 is a sectional view of the door 5 shown in the yz plane, while the upper portion of the door 5 shown.

As in the Fig. 2 to 5 can be seen, the functional elements 33 on the outer sides of the end caps 26 and 27 and thus arranged on the metal part 20 facing away from the outer surfaces, so that they are easily accessible for operation by a user and can be pressed. In addition, they are arranged below the recesses 28, so that the engagement of the locking element is not hindered.

LIST OF REFERENCE NUMBERS

1

oven

2

casing

3

muffle

4

oven

5

door

6

windscreen

7

door handle

8th

inner pane

9

first intermediate disc

10

second washer

11

cooking zone

12

cooking zone

13

cooking zone

14

cooking zone

15

operating device

16

display unit

17

operating element

18

operating element

19

cover

20

core part

21

Through opening

22

Through opening

23

Through opening

24

Plastic part

25

strip

26

endcap

27

endcap

28

admission

29

functional element

30

sloping flank

31

functional element

32

functional elements

33

functional element

I

neckline

II

neckline

Claims (8)

1. Door (5) for a household appliance (1), having at least one plate-like door panel (6, 8 to 10) and a strip-shaped cover (19) which covers the door panel (6, 8 to 10) from above at least partially, and which is formed from at least two different materials, wherein the cover (19) is formed as a hybrid component from at least two different materials, wherein the cover (19) is formed as a hybrid component from at least the materials plastic and metal, characterised in that

   - the cover (19) has a core part (20) made of metal, which is at least partially encapsulated with plastic, or

   - the cover (19) has a core part (20) made of metal, which is partially surrounded and fused with plastic or is inlaid and flanged or embossed in the plastic, or

   - the cover (19) has a core part (20) made of metal, which is non-destructively detachably connected, in particular snapped on, to an encasement part formed from plastic,

   wherein in each case the core part (20) is connected to the plastic such that a relative movement is enabled because of different material expansion under the influence of heat, wherein the core part (2) is connected to the plastic by a floating bearing and a fixed bearing and is arranged at least partially floating in the plastic.
2. Door (5) according to claim 1, characterised in that the plastic has at least two different types with respect to temperature resistance, and a first area of the hybrid component formed from plastic is formed from a plastic having a first temperature resistance and a second area of the hybrid component formed from plastic is formed from a plastic having a second temperature resistance different from the first temperature resistance.
3. Door (5) according to one of the preceding claims, characterised in that a heat decoupling element is formed between the metal and the plastic.
4. Door (5) according to claim 3, characterised in that the heat decoupling element is made of glass fibre or graphite or an elastomer.
5. Door (5) according to one of the preceding claims, characterised in that functional elements (28, 29, 31, 32, 33) are integrated in the part of the hybrid component formed from plastic.
6. Door (5) according to claim 5, characterised in that a functional element (28) comprises a receptacle for a locking element for locking the door (5) in a pyrolysis mode of a household appliance (1) designed as a cooking appliance and/or a functional element (29) is a stop for a door contact switch and/or a functional element (33) is a snap hook for coupling the cover (19) to another component of the door (5) and/or a functional element (32) is a dome for transmitting force and/or a functional element (31) is a locking device for preventing the detachment of a front system, in particular a front panel (6), of the door (5).
7. Door (5) according to one of the preceding claims, characterised in that the cover (19) is designed as hood-shaped and has through-openings (21, 22, 23) for air flows.
8. Household appliance, in particular cooking appliance, having a door (5) according to one of the preceding claims, which is designed to close a receiving space (4) of the household appliance.

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