EP2357414B1 - Domestic appliance for preparing food having a bushing - Google Patents

Description

The invention relates to a domestic appliance for preparing food, with a muffle, on which at least one bearing bush is arranged.

In known ovens bearing bushes are arranged on an inner side of a muffle, which limits a cooking space, which are adapted to receive supporting frames on which a food support can be applied. Currently, these bushings are made of sintered metal with surface coating and parts made of stainless steel. Especially when using the jacks in cooking appliances with pyrolysis function, these jacks have yet to be specially treated to withstand the conditions of pyrolysis. Such sockets are manufactured in a complex and MIM (Metal Injection Molding) method and are very expensive. Nevertheless, the suitability is limited even with these sockets. This is where breakers of the applied protective layer occur. Furthermore, the mechanical stability of conventional sintered bronze bushings is limited and fractures occur.

Moreover, from the document US5162628A a supporting device for a skewer, which is removably held on a drip tray of an electric oven with heating elements and integrated microwave and two opposing holder, each isolated on the one hand to the spit by an interspersed by the insulating washer and on the other hand with respect to the drip tray by an insulating base which are intended to rest on an edge stop of the drip tray and at least one foot of a smaller horizontal cross section than the cross section of the underside of the head intended to pass through a corresponding opening of the drip tray with a small circumferential clearance, each opening having a skirt forming a skirt and having the height and the horizontal cross section of the foot depending on the horizontal cross section of the opening so dimensioned that when tilting the support device to a horizontal axis by supporting a contour portion of the head on the edge stop of the drip tray one axis opposite region of the foot comes into abutment against the skirt, whereby the exit of the foot is prevented from the opening.

DE 10 2009 022 220 A1 discloses a domestic appliance according to the preamble of claim 1. It is an object of the present invention to provide a domestic appliance for preparing food, which can be produced inexpensively and beyond the specific requirements and wear is less.

This object is achieved by a domestic appliance, which has the features of claim 1.

The invention relates to a domestic appliance for preparing food, which has a muffle, which comprises a side wall, in which a recess is formed. In this recess a bearing bush according to the invention or an advantageous embodiment thereof is arranged. In the bearing bush, a support frame for a food support and / or a pull-out system can be used. The food support is thus received directly by the support frame or it can also be provided that the extraction system is arranged on the support frame and the food support is attachable to the extension system. By such a configuration, the support frame can be stored particularly stable on this ceramic bushing. The bushing is formed of a ceramic material. By such a material design of the bearing bush, this can be made significantly cheaper and is mechanically very stable. In a particularly advantageous manner, however, the different requirements for use in a household appliance can be better taken into account with such a material design of the bearing bush. Especially when using such a bushing in a cooking chamber of a domestic appliance for preparing food thus the strong thermal loads as well as the chemical stress in terms of corrosion and the like bill better worn and in this regard unwanted wear or other malfunction can be avoided. The bearing bush is also significantly lighter than the known bushes made of metal.

In addition, formed from a ceramic material bearing bush in the production in significantly fewer steps and without an additional surface treatment, as in the bushings of the prior art of Case is done. Not least of all, this results in a more cost-effective production and a lower risk of error in the manufacturing process.

Amazing meadow could be found that even in the form of very specific parts with many corners and edges and grooves, as it has said bearing bush, also of ceramic material with sufficient stability can be produced. This was not possible until now.

In particular, the bearing bush is initially formed as a ceramic intermediate and then the formation of the grooves is provided for the retaining springs. This is in particular formed by mechanical processing. Subsequent to this Nutausbildung then the production of the final product is provided. For this purpose, a temperature of the formed with grooves intermediate product is provided above 1000 ° C and generates the mechanically stable form-complex end product as a bearing bush. An additional coating with a non-corrosive layer is not required.

Such a specific ceramic material from which the bearing bush is formed, not only in terms of corrosion resistance and greater thermal resistance also at least the same mechanical stability as the conventional bushings.

Preferably, the ceramic material is a magnesium silicate ceramic material. In particular, the ceramic material is steatite C221. Such a magnesium silicate material is particularly advantageous with regard to use in a cooking chamber of a domestic appliance for preparing food and is particularly suitable with regard to corrosion resistance, temperature exposure and mechanical stability.

It may also be provided that the ceramic material is cordierite ceramic. This too is a specific ceramic material, which has corresponding advantages in terms of the use of the bearing bush in a cooking chamber.

In a further embodiment it can be provided that the ceramic material is forsterite ceramic. Again, this is a corresponding alternative specific ceramic material, which withstands the conditions in a cooking chamber particularly suitable and ensures the corresponding cost reduction over known bushings.

In particular, the bearing bush is integrally formed. The above-mentioned advantages compared to the production of known bearing bushes made of sintered metal with surface coating apply here in particular.

Preferably, the bearing bush has a continuous opening or a hole, which is designed for receiving and performing a portion of the household appliance component. A particularly mechanically stable recording and storage is ensured.

In particular, the bearing bush comprises a rear connection region for insertion into a recess in the domestic appliance component, and moreover comprises a front-side contact flange, which in particular directly adjoins the connection region and is designed as a stop on the upper side of the domestic appliance component. By such a configuration, the mechanically stable and robust attachment to the home appliance component can be ensured and the stop an undesirable tilting or twisting can be avoided, so that the storage of the home appliance component can be done very reliable and tolerance-free. An unwanted wobbling can be avoided, as is ensured by this specific shape of the bearing bush a particularly stable fixation of the home appliance component.

Preferably, in each case a slot or a groove is formed on the lateral outer sides of the connecting region. This is designed to receive a retaining spring for holding the bearing bush in an opening of a muffle inner wall.

By means of such a specific material configuration with the bearing bush, it is also possible to standardize SR (self-cleaning process or pyrolysis) and not SR components in the domestic appliance, since a price advantage is achieved by the new material design of the bearing bush in both appliance classes.

Not only a smaller weight of the bearing material formed of ceramic material can be achieved over the conventional bushings, but also a much smaller specific heat capacity is given by this material design, resulting in an improvement of the energy classification of the domestic appliance for food preparation, in which such a bushing is used, is achieved.

In addition, such a material-specific trained bushing is completely recyclable and the production can be done without the use of harmful chemicals. As a result, in particular during the production process of the bearing bush, a contribution to environmental protection can be made.

The design of a one-piece ceramic bearing bush can also be an integral construction. The inclusion of extraction systems, KAT (Katalyt) sheets (shields that cover the side wall over a large area and coated with Katalyt enamel) and the attachment to the inner wall, in particular openings, the muffle of the oven is in particular with safety springs, such as stainless steel, allows. The bushing is thus held by such a spring in the recess of the side wall of the muffle fixing positionally secure and abrasion can be substantially reduced, whereby the wear is reduced.

Further features of the invention will become apparent from the claims, the figures and the description of the figures.

Fig. 1

eine vereinfachte perspektivische Darstellung eines Ausführungsbeispiels eines erfindungsgemäßen Hausgeräts;

Fig. 2

eine perspektivische Frontansicht einer Ausführungsform einer hinteren Lagerbuchse;

Fig. 3

eine perspektivische Ansicht von hinten der Lagerbuchse gemäß Fig. 2;

Fig. 4

eine perspektivische Ansicht von vorne einer Ausführungsform der vorderen Lagerbuchse; und

Fig. 5

eine perspektivische Ansicht von hinten der Lagerbuchse gemäß Fig. 4.

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

Fig. 1

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

Fig. 2

a front perspective view of an embodiment of a rear bearing bushing;

Fig. 3

a perspective view from the rear of the bearing bush according to Fig. 2 ;

Fig. 4

a front perspective view of an embodiment of the front bearing bushing; and

Fig. 5

a perspective view from the rear of the bearing bush according to Fig. 4 ,

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

In Fig. 1 is shown in a schematic representation of a trained as a baking oven 1 home appliance for preparing food. The oven 1 comprises a hob 2 with four cooking zones 3, 4, 5 and 6. In addition, the oven 1 comprises a cooking chamber 7 which is delimited by a muffle 8. The muffle 8 comprises vertical side walls 9, 10 as well as a bottom wall 11, a top wall 12 and a rear wall 13. The cooking space 7 can be closed at the front by a door, not shown, and moreover comprises an operating device, not shown, which has operating elements and a display unit.

On the inside of the vertical side walls 9 and 10 recesses 14, 15, 16 and 17 are formed. Both the number and the position of these recesses 14 to 17 is merely exemplary. In addition, corresponding openings and corresponding numbers are formed on the opposite vertical side wall 10. In the openings 11 to 17 bearing bushes are introduced, of which only the bearing bushes 18 and 19 are provided with reference numerals. These bushings 18 and 19 are mounted in the vertical direction (y-direction) at the same height level.

The bushings 18 and 19 are formed for receiving the support frame, not shown. On the support frame, a food support, not shown, and / or a rail extension system can be arranged. If a rail extension system is present, the food support can be positioned on it and pulled out of the cooking chamber 7 and inserted.

The bushings 18 and 19 are held by not shown securing springs, which may be, for example, stainless steel, in the openings 14 and 15 respectively.

In the following Fig. 2 to Fig. 4 The bushings 18 and 19 are explained in more detail.

In Fig. 2 is shown in a perspective front view, the rear bearing bush 19. The bearing bush 19 is integrally formed and made of a ceramic material. In the exemplary embodiment, it is provided that the ceramic material is Steatite C221. The bushing 19 has a continuous opening 20 through which extends through a component of the support frame and the support frame is thereby held stable. The rear bearing bushing 19 also has a system flange 21, which serves as a stop to the front of the side wall 9.

In the illustration according to Fig. 3 the bearing bush 19 is shown in perspective from the rear, wherein it can be seen that a connecting region 22 is formed directly on the rear side of the abutment flange 21 which is smaller in dimensions than the abutment flange 21 so that the connecting region 22 is concealed on the front by the abutment flange 21 is. With this connection region 22, the bearing bush 19 is introduced fixed in the opening 15. By projections 23 and 24 on the inner wall, which limits the opening 20, the holding and fixing positioning of the support frame in the bearing bush 19 can be reinforced.

In Fig. 4 is a perspective view from the front of the front bearing bushing 18 shown. This also has a contact flange 21 ', on the rear side of which a connecting region 22' is formed. Throughout the bushing 18 is again a continuous opening 20 'is formed, which is provided for receiving a further portion of the support frame. Also here are appropriate Projections 23 'and 24' formed by which the fixing support of the support frame member is made possible. Also, the front bushing 19 is integrally formed of the ceramic material steatite C221.

In FIGS. 3 and 5 are formed on the sides of the connecting portions 22 and 22 'slots 25 and 25', engage in the retaining springs, with which the bearing bush 18 and 19 is held in the opening 14 and 15 respectively.

LIST OF REFERENCE NUMBERS

1

oven

2

hob

3, 4, 5, 6

cooking zones

7

oven

8th

muffle

9, 10

side walls

11

bottom wall

12

ceiling wall

13

rear wall

14, 15, 16, 17

recesses

18, 19

bushings

20, 20 '

opening

21, 21 '

Anlagenflansch

22, 22 '

connecting area

23, 23 ', 24, 24'

projections

25, 25 '

groove

Claims (8)

1. Domestic appliance for preparing food, having a muffle (8) which has a side wall (9, 10) in which a recess (14 to 17) is formed in which a bushing (18, 19) is arranged, wherein a carrier frame for a food carrier and/or a pull-out system can be inserted into the bushing (18, 19), characterised in that the bushing (18, 19) is formed from a ceramic material.
2. Domestic appliance according to claim 1, characterised in that the ceramic material is a magnesium silicate ceramic.
3. Domestic appliance according to claim 2, characterised in that the ceramic material is steatite C221.
4. Domestic appliance according to claim 1, characterised in that the ceramic material is cordierite ceramic.
5. Domestic appliance according to claim 1, characterised in that the ceramic material is forsterite ceramic.
6. Domestic appliance according to one of the preceding claims, characterised in that it is formed in one piece.
7. Domestic appliance according to one of the preceding claims, characterised in that the bushing (18, 19) has a continuous opening (20, 20') which is designed to accommodate and feed through a partial region of the domestic appliance component.
8. Domestic appliance according to one of the preceding claims, characterised in that the bushing (18, 19) has a rear connection region (22, 22') for introduction into a recess (14 to 17) in the domestic appliance component (8), onto the front of which a stop flange (21, 21') is formed as a stop to the top of the domestic appliance component (8).

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