EP2703733B1 - Attachment element for a domestic appliance, and household appliance for preparing food with an attachment element - Google Patents

Description

The invention relates to an attachment element, in particular a threaded rivet, for a domestic appliance which has a deformable connection region for connecting the attachment element to a first component, and at least one thread for screw coupling the attachment element to a second component. Furthermore, the invention relates to a device for a household appliance, which has at least one such attachment. In addition, the invention also relates to a household appliance for preparing food, with a limited by a muffle cooking chamber, which has formed as first components side walls in which holes are formed, and which also has at least one attachment element.

In household appliances, such as an oven, bearing bushes are arranged on an inner side of a muffle, which limits a cooking space, which are designed to accommodate carrying racks on which a food support can be applied. In this context, for example, the muffle may be the household appliance component and the attachment or a household appliance component may be a suspension grid for a food support and / or a pull-out system, for example a telescopic rail.

The DE 10 2008 017 689 A1 describes a press-fit nut, which can be manufactured in a MIM technology.

Published after the filing date of the present application WO 2012/166552 A1 describes the production of fasteners through 3D printing.

An oven muffle is for example from the DE 195 00 371 A1 known.

The DE 199 09 821 A1 describes a rivet for joining workpieces, which is designed as a metal powder injection molding.
The US 3 304 830 A shows an anti-rotation, expandable tubular rivet having a head and integral axial shaft of prismatic shape having an outwardly expandable portion between the head and the shaft base with a recess of greater cross-section than the bore of the shaft base, wherein the outwardly expandable portion of the shank has an outer surface of substantially polygonal shape which, in conjunction with the circular central bore, causes a nonuniform wall thickness which increases uniformly from a minimum in the longitudinal zones between the corners of the polygon to a maximum at these corners ,
The DE 10 2007 060 089 A1 discloses a fastening sleeve with a groove which serves to deform the fastening sleeve.
The CA 2 378 812 A1 discloses the preamble of claim 1. Since the walls of such a muffle should be made as thin as possible, new requirements are made of holes in these walls, which must then take bushings and other components. In particular, with regard to mechanical stability and mounting options new requirements are here to meet.
It is an object of the present invention, an attachment, to provide a device with such a mounting element and a household appliance, which or which is improved in terms of mechanically stable attachment of other components.
This object is achieved by an attachment element, and a household appliance according to the claims.

An attachment according to the invention for a domestic appliance comprises a deformable connection region for connecting the attachment element to a first component. In addition, the attachment element comprises at least one thread for screw coupling the attachment element with a second component. The add-on element thus comprises two different and separate connection points, which enables the mechanical coupling with two separate components at different locations. An essential idea is to be seen in that the attachment is designed as a powder metallurgy. This means that the attachment is made by a powder metallurgical manufacturing process, this being by the mechanical compression of metal powders in molds or presses and simultaneous or subsequent sintering at high temperatures or hot rolling into a block.

This is an essential difference to known embodiments of such attachments, which are designed as threaded rivets, which are designed so far as a cold extruded part. In contrast, the realization of thinner-walled regions in such a component is made possible by a powder metallurgy part and an increase in the producible shape complexity. In addition, with such designed extension elements further processing by means of user-friendly and manageable tools possible and there are no large machines, such as riveting machines required, but such attachments can then be mounted with even simple hand riveting guns.

It is provided that the connection region of the add-on element is a zone which can be shortened by compression in the direction of the longitudinal axis of the add-on element. This can be achieved by a simple procedure and a very defined attachment to a component.

The add-on element is designed as a MIM (Metal Injection Molding) component. An MIM component is a specification of a powder metallurgy part. The MIM process is a metal powder injection molding, which takes place in an injection molding process. As a result of this configuration, it is therefore also possible to produce solid one-piece parts from a material in complex shapes. As starting materials both metals and metal alloys can be used. A correspondingly shaped body as an MIM component can preferably also be post-processed after production and thus preferably after sintering and / or debindering. It may be provided here that a surface treatment is formed by a sandblasting or vibratory grinding or polishing or lapping. Likewise, a heat treatment can be carried out to achieve a hardening. Also, a machining, such as turning, milling, drilling, grinding, rubbing, honing etc. may be provided.

As a powder, for example, iron, tungsten, tungsten carbide or mixtures of alloys of various compositions, such as chromium / nickel compounds may be provided.

According to the invention, the connection region is formed as a hollow section having a wall thickness which is smaller than a wall thickness of partial regions adjoining the connection region. On account of this specific shaping of the connection region and the material thickness configuration, on the one hand the point at which deformation of the attachment element is to take place during fastening can be specified very precisely, on the other hand a desired fastening scenario can be reliably achieved, so that the attachment element can be mechanically stable and durably loadable connected to the component.

According to the invention, the wall thickness in the connection region varies at least once viewed in the axial direction. By such a configuration, the point at which a deformation, in particular a compression should occur, can be localized even more precisely and then the desired deformation scenario done very defined.

According to the invention, the thickness variation is formed by a groove.

In particular, the attachment element is integrally formed.

A particularly advantageous embodiment is provided in that the thread is greater than or equal to M16, which is a metric thread is. It is thus possible in such a functionally geometrically highly specific attachment element to realize such a large thread and to make the attachment in view of the then occurring connection forces mechanically stable and with high load capacity. Such a configuration with a thread of this size is not possible in the known from the prior art embodiments of attachments as Kaltfließpressteile.

It is preferably provided that a thread having a first portion of the attachment element is formed with a deformable connection region having second portion overlapping in the axial direction. This means, in particular, that these two areas are arranged radially spaced from each other, but intermesh, so that they are virtually merged into one another in the axial direction. Thereby Individual configurations with regard to the coupling with the two components can be achieved and a very length-shortened attachment element can be realized.

It is preferably provided that a thread having a first portion of the attachment element is formed with a deformable connection region having second portion of the attachment in the axial direction without overlap. As a result, even very large threads can be formed without the add-on element having to be oversized radially.

It is preferably provided that the second partial region of the add-on element viewed in the axial direction is arranged between the first partial region and a third partial region having a further thread. By means of such an embodiment of an attachment element, two separate and, in particular, differently dimensioned metric threads can thus be formed, which are then arranged locally at different locations on the attachment element. As a result, different second components can be screwed to the attachment. This results in the possibility that two different second components are arranged on the attachment element at the same time or the attachment used variable for executions can be, in which a second component is dimensioned by screw coupling with the first thread or by screw coupling with the second thread. Preferably, it is provided that a partial region of the add-on element having a connection region has a polygonal, in particular a polygon formed with a number n of 3 ≦ n ≦ 8, preferably n = 6, in the circumferential direction. In this context, it can be provided that the sections between the corners of this outer geometry are rectilinear or have different lengths.

Furthermore, the invention relates to a household appliance, which has at least one attachment according to the invention. The attachment is inserted and fixed in a hole of a home appliance component of the device formed as a first component. The household appliance component is in particular a side wall of a muffle, which limits a cooking chamber of a household appliance designed as a cooking appliance.
Furthermore, the invention relates to a household appliance for preparing food, with a limited by a muffle cooking chamber having formed as first components side walls in which holes are formed. In at least one such hole, an attachment according to the invention or an advantageous embodiment thereof is arranged.
The first component is in particular a household appliance component in the form of a side wall of a muffle, which has a plate-like base support with a hole. The plate-like base support preferably has a wall thickness <1.8 mm, preferably <1.5 mm.
It can also be provided that the attachment element has self-locking elements which are integrated in the attachment element. It may be provided in the context, for example, a sawtooth toothing on the head or axially at the end of the threaded portion.

In addition, areas for receiving sealing materials may be provided on the attachment. It is also possible to make the shape of a head or an end of an attachment very specific and individual, so that a variety of visible surfaces can be formed. For larger head configurations, thus low surface pressures can be realized, which is very advantageous, especially on sensitive surfaces such as enamel. In particular, it can also be provided that an electrical contact between the first component and the add-on element is defined and manufactured in a targeted manner. This is particularly advantageous in cooking appliances that are designed as Mikrowellengargerät, as this can be achieved exactly at this hole location and a microwave density.

In a particularly advantageous manner, it is provided that the rivet bead is specifically applied to the neighboring material of the first component and in the context then a coating in the form of an enamel is removed, in particular flaked off. As a result, an electrical ground connection can be generated at this contact point and it is no longer necessary to provide a separate grounding line.

Since preferably the attachment member is rod-shaped to the first component at an angle, in particular perpendicularly, at this point the connection with an additional blank location on the first component formed of an electrically conductive material can be carried out an electrical resistance measurement. This makes it possible to carry out a relevant test very easily.

In addition, the add-on element can also be realized in an embodiment in which it is completely realized as a hollow body and thus viewed open at the two opposite ends in the direction of the longitudinal axis with a continuous channel. In such an embodiment, the attachment can thus be used as a passage for cables and the like.

In addition, however, it can also be provided that the attachment element is open only on one side and with a cavity, and is closed on the other opposite end side, so that viewed in the direction of the longitudinal axis no continuous channel-like cavity is formed.

A household appliance component comprises a plate-like base body, in which a hole for performing an attachment is formed. The hole is surrounded at least partially by a protruding from the hole plane collar at its boundary edge. The collar has an inner surface which, in a sectional plane perpendicular to the hole plane, has a contour which comprises at least one straight-line first contour section. By such a configuration of the household appliance component in the hole area, the hole area can be mechanically very stable and highly resilient even with relatively thin household appliance component. The inclusion of different attachments to the hole is then easily possible. The collar stabilizes the hole and prevents twisting. Decisive, however, is then the design of the inner surface, which according to the invention comprises a rectilinear first contour section, through which the inclusion of an attachment is improved. Because it can thereby create the attachment as large as possible to this inner surface, so that here over the largest possible surface area a positive contact is achieved. A mechanically stable fit of the attachment in the hole is achieved.
It is preferably provided that the rectilinear first contour section is formed at the end of the contour facing away from the boundary edge. In this end region of the contour, a backlash-free fit of the attachment is particularly advantageous because there the stabilizing effect of the plate-like body as such is then still the least. Just there is a possible large-scale concerns of the attachment to the inner surface for a mechanically stable seat particularly advantageous. It is preferably provided that the first straight contour section is oriented parallel to a hole axis. The advantages mentioned above are thereby further favored.
It is preferably provided that, in the sectional plane perpendicular to the hole plane, the rectilinear first contour section extends over a length of the entire contour which is> 1/10, preferably> 1/8 of the total length of this contour. This is ensures that this contour portion is designed to be relatively large, so that the above-mentioned advantages and a possible large-scale abutment between the attachment and this contour portion are reached.

By this particular sheared surface area with the first contour portion and a surface for electrical grounding is created when the attachment rests against the first contour portion. Due to the specific shaping of the contour section, no coating material such as, for example, enamel is applied. It must therefore be formed no separate ground connection, so that the collar is also multifunctional.

It is preferably provided that a second contour section adjoins the first rectilinear contour section, which section has a smaller inclination than the first contour section. By this configuration, the insertion of the attachment into the hole is particularly easy and avoid spreading or jamming. Nevertheless, a mechanical stabilizing effect is achieved here as well. In particular, by such a configuration, the collar is mechanically stiffened in itself.

It is preferably provided that the second contour section is rectilinear. Again, the mechanical stability of the collar is favored and produces a funnel-like shape.

It is preferably provided that the second contour section has a larger surface height than the first contour section. This is considered in the sectional plane perpendicular to the hole plane. In particular, it means that, as it were, the height of the contour sections in the direction of a hole axis are dimensioned accordingly. This ensures that the collar does not have to be formed undesirably high in the direction of the longitudinal axis or the hole axis, on the other hand, the advantages already mentioned above fully come into play.

It is preferably provided that a third contour section adjoins the second contour section, which then represents, in particular, the contour section closest to the boundary edge and opening onto the boundary edge. Preferably, this third contour section is arc-shaped when viewed in the sectional plane perpendicular to the hole plane. As a result, a corner-free transition is provided to the boundary edge, so that on the one hand the insertion of the fixture is facilitated in the hole and a spreading and jamming of the fixture is prevented when inserted into the hole.

It is particularly advantageous that the boundary edge has at least a number n with 3 ≦ n ≦ 8, in particular n = 6, corners. Such a configuration is particularly advantageous, since thus a specific twist protection is achieved around the hole axis of an attached attachment. In addition, the mechanical stability is significantly improved in a very thin configuration of the plate-like body just in this hole area. Such polygonal passages favor the above advantages significantly. In addition, by such designs of the boundary edges and mounting coding for an attachment can be created so that they can not be incorrectly inserted into the hole.

It is preferably provided that boundary edge sections are formed in a straight line between the corners. The boundary edge sections may be the same length or have different lengths.

Fig. 1

eine perspektivische vereinfachte Darstellung eines Ausführungsbeispiels eines erfindungsgemäßen Haushaltsgeräts;

Fig. 2

eine perspektivische Teildarstellung des Haushaltsgeräts gemäß Fig. 1;

Fig. 3

eine perspektivische Darstellung eines Ausführungsbeispiels einer Haushaltsgerätekomponente mit einer spezifischen Geometrie eines Lochs bzw. einer Aussparung zur Aufnahme eines Anbauteils bzw. Anbauelements ;

Fig. 4

eine weitere perspektivische Darstellung der Ausführung in Fig. 3;

Fig. 5

eine vergrößerte Darstellung eines Teilausschnitts der Ansicht in Fig. 4 mit teilweiser Schnittdarstellung;

Fig. 6

eine perspektivische Darstellung in Schnittansicht einer Vorrichtung für ein Haushaltsgerät gemäß Fig. 1 und Fig. 2, die ein erstes Ausführungsbeispiel eines Anbauteils in einem Loch gemäß Fig. 3 und Fig. 4 der Haushaltsgerätekomponente aufweist;

Fig. 7

eine perspektivische Schnittdarstellung eines weiteren Ausführungsbeispiels einer Vorrichtung für ein Haushaltsgerät bei der im Unterschied zur Darstellung in Fig. 6 ein dazu unterschiedliches Anbauteil in das Loch eingesetzt ist;

Fig. 8

eine perspektivische Darstellung der Ausführung in Fig. 7;

Fig. 9

eine Schnittdarstellung durch ein erstes Ausführungsbeispiel einer Vorrichtung mit einem Anbauelement;

Fig. 10

eine Schnittdarstellung der Ausgestaltung in Fig. 9 mit dem in der befestigten Endposition gezeigten Anbauelement;

Fig. 11

eine Schnittdarstellung durch ein weiteres Ausführungsbeispiel eines Anbauelements;

Fig. 12

eine Schnittdarstellung durch ein drittes Ausführungsbeispiel eines erfindungsgemäßen Anbauelements;

Fig. 13

eine Schnittdarstellung durch ein viertes Ausführungsbeispiel eines erfindungsgemäßen Anbauelements; und

Fig. 14

eine Schnittdarstellung durch ein fünftes Ausführungsbeispiel eines erfindungsgemäßen Anbauelements.

In particular, it is provided that the first contour section is produced by an embossing tool introduced into the collar in surface orientation and / or surface flatness. Such preferably used stamp allows a very precise and accurate generation of the contour of the boundary edge in particular of the first straight contour section. This is particularly important in order then to be able to achieve the large-area abutment of the attachment in the hole with high mechanical stability already explained above. Just by such a stamping tool is the production of preferably polygonal passages in the form of holes with boundary edges, which allows a number n of corners, as mentioned above, in only one manufacturing step. In particular, the embossing tool is introduced into a stepped matrix of the household appliance component. As a result, preference is given to the basic body before the embossing tool in the first contour section defines the material on the inner surface of the collar, for example, by cutting it off. By such an embossing die and described in this regard In the manufacturing process, any polygonal shapes of the bounding edge can be created. In addition, a defined height of the collar and thus of the draft can also be generated. In addition, also defined oblique shapes of the collar as well as collar shapes in free-form surfaces are possible. Last but not least, it also makes installation security based on the Poka Yoke principle possible through irregular shapes.
Not least, a significant advantage is also to be seen in the fact that a corrosion protection is increased in enameled bodies, since the Zehrkanten are formed outside the limited by the household appliance component interior.
Preferably, it is provided that the household appliance component is a muffle of a cooking appliance, in particular a side wall of a muffle of a cooking appliance.
Further features of the invention will become apparent from the claims, the figures and the description of the figures. The features and feature combinations mentioned above in the description, as well as the features and feature combinations mentioned below in the description of the figures and / or shown alone in the figures, can be used not only in the respectively indicated combination but also in other combinations or in isolation. 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 household appliance according to the invention;

Fig. 2

a partial perspective view of the household appliance according to Fig. 1 ;

Fig. 3

a perspective view of an embodiment of a household appliance component with a specific geometry of a hole or a recess for receiving an attachment or add-on element;

Fig. 4

another perspective view of the embodiment in Fig. 3 ;

Fig. 5

an enlarged view of a partial section of the view in Fig. 4 with partial sectional view;

Fig. 6

a perspective view in sectional view of a device for a household appliance according to Fig. 1 and Fig. 2 , which is a first embodiment of an attachment in a hole according to FIG. 3 and FIG. 4 the household appliance component comprises;

Fig. 7

a perspective sectional view of another embodiment of a device for a household appliance in contrast to the representation in Fig. 6 a different attachment is inserted into the hole;

Fig. 8

a perspective view of the embodiment in Fig. 7 ;

Fig. 9

a sectional view through a first embodiment of a device with a mounting element;

Fig. 10

a sectional view of the embodiment in Fig. 9 with the attachment shown in the fixed end position;

Fig. 11

a sectional view through a further embodiment of an attachment element;

Fig. 12

a sectional view through a third embodiment of an attachment element according to the invention;

Fig. 13

a sectional view through a fourth embodiment of an attachment element according to the invention; and

Fig. 14

a sectional view through a fifth embodiment of an attachment element according to the invention.

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

In Fig. 1 is a schematic representation of a designed as a baking oven 1 household appliance for preparing food, which thus represents a cooking appliance shown. The oven 1 comprises a hob 2 with four cooking zones 3, 4, 5 and 6, which are to be understood only in the form and number and position by way of example. The hob 2 is also an optional embodiment of the oven 1. In addition, the oven 1 comprises a cooking chamber 7, which is limited by a muffle 8, which is a superordinate household appliance component. The muffle 8 comprises as domestic appliance components vertical side walls 9 and 10 and a bottom wall 11, a top wall 12 and a rear wall 13. The cooking chamber 7 is closed at the front by a door, not shown, and moreover comprises a control device, not shown, which have control elements and a display unit can.

On an inner side of the vertical side walls 9 and 10 recesses or holes 14, 15, 16 and 17 are formed. Both the number and the position of the holes 14 to 17 is merely exemplary and in addition corresponding openings are formed in the opposite vertical side wall 10 in a corresponding height and corresponding number. In the holes 14 to 17 bearing bushes are introduced as attachments or attachments, of which only the bushings 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. The designed as a household appliance component support frame or suspension grid 20 ( Fig. 2 ) can be a food support, as in Fig. 2 is shown, and / or a rail extension system. 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. Both the bearing bushes 18 and 19 and the Einhängegitter 20 may represent add-on parts, in particular, only the suspension grid 20 is a household appliance component.

The bushing 18 is a front bearing bush wherein the bearing bush 19 is the rear. This is considered with respect to the depth direction and thus the z-direction.

The bushing 18 includes a front flange or abutment flange having a front opening. Through this opening, a portion or an end of the household appliance component can be passed in the form of Einhängegitters 20. In particular, a free end of a guide rod 20a or 20b (FIG. Fig. 2 ) of the hanging grid 20 inserted therethrough.

In Fig. 3 is shown in a perspective view, the side wall 9 with the hole 14 in sections. It is a view on an outside 9a, which faces away from the cooking chamber 7 shown. The side wall 9 comprises a plate-like base body 21 which extends substantially in a plane, wherein the hole 14 extends with its hole plane in this plane of the plate-like base body 21. From this level rises a collar 22, which opens at a boundary edge 23 of the hole 14. The collar 22 is formed completely circumferential and closed.

In Fig. 4 is in a further perspective view of the side wall 9 with a view of an inner side 9b, which faces the cooking chamber 7 shown. It can be seen that the boundary edge 23 is formed with a number n = 6 corners. It thus represents a polygonal passage through which a rod 20a or 20b or a different element which is attached to a vertical support rod 20c (FIG. Fig. 2 ) is arranged, is insertable. This can be done directly, but preferably via a bushing 18, which is then inserted into the hole 14.

In Fig. 5 is a perspective sectional view of a partial section of the illustration in Fig. 4 shown here, wherein the sectional view along the section line VV is shown.

As in the view in Fig. 5 can be seen, the collar 22 in the direction of a hole axis A viewed on several consecutive inner surface portions. In this connection, an inner surface 24 of the collar 22 forms through the inner surface portions 24a, 24b and 24c. As in the sectional view in Fig. 5 can be seen, the inner surface 24 has a in the sectional plane perpendicular to the hole plane specifically designed contour that includes at least one rectilinear first contour portion 25a. This contour section 25a is formed at an end of the collar 22 facing away from the boundary edge 23 and ends at a free edge 26 of the collar 22.

In the direction of the delimiting edge 23, following this first rectilinear contour section 25a, a second contour section 25b follows, which is preferably also rectilinear.

The contour portion 25a is formed in particular parallel to the hole axis A. In contrast, it is preferably provided that the contour section 25b does not run parallel to the hole axis A, but extends slightly outwardly starting from the first contour section 25a.

It is preferably provided that adjoining the second contour section 25b is a third contour section 25c which ends at the boundary edge 23. This third contour section 25c is preferably curved, so that in the overall geometry of the collar 22 a funnel-like shape is formed.

In particular, it is also provided that a height of the contour section 25a is considered in the direction of the longitudinal axis A and thus a height parallel to the longitudinal axis A is smaller than a height of the contour section 25b that is parallel to the longitudinal axis A.

Preferably, an absolute length of the contour portion 25a in relation to the total length of the contour of the collar 22 is greater than 1/10, preferably greater than 1/8 of this total length.

Between the six corners of the boundary edge 23 boundary edge portions are formed which are rectilinear and are the same length or can be formed with different lengths. In the corners rounded transitions 27 are formed.

An angle α between the main body 21 and the collar 22 is adjustable over the steps and the upper radius of a structure provided as a die. In the context, it should be mentioned that the plate-like base body 21 is provided and a collar 22 may be preformed. In particular, it is provided that the collar 22 is produced by an embossing tool in a single processing step, and in particular the design of the inner surface portion 24a is defined with the first straight contour portion 25a defined by material sheared by the embossing tool.

In Fig. 6 is an embodiment of a device 28 is shown in a perspective sectional view, which has the side wall 9 with the base body 21 and the hole 14 and beyond a separate attachment 29 includes, which is inserted into the hole 14. In the embodiment shown according to Fig. 6 is the attachment 29, the bearing bush 18 which is designed as a hollow cylindrical threaded carrier having an internal thread 30. In the embodiment shown, the attachment 29 formed as a bearing bush 18 comprises a front flange or abutment flange 31, which has a larger radius than the boundary edge 23 and rests against the inside 9b in the assembled final state. Subsequent to this abutment flange, a connecting region 32 is formed, which extends into the hole 14 along the collar 22. To the attachment 29 in the form of the bearing bush 18 may then another household appliance component, for example, the suspension grid 20, are arranged or arranged and screwed another part.

In the embodiment shown, the connecting portion 32 does not extend beyond the collar 22 in the direction of the axis A.

In Fig. 7 a further embodiment of a device 28 is shown in a further perspective sectional view. Unlike the execution in FIG. 6 is here designed as an attachment 29 a bearing bush 18 in the form of a blind rivet. This extends in the direction of the axis A backwards beyond the collar 22 clearly.

The connection portion 32 includes as well as in the embodiment in Fig. 6 a partial section 33, which has an outer geometry, which is adapted to the angular shape of the boundary edge 23 and also of the collar 22. As a result, a positionally secure attachment in the hole 14 is achieved, which is also designed to prevent rotation.

In an adjoining the section 33 to the rear and thus on the side facing away from the collar 22 section 34, an internal thread 30 may be formed.

Preferably, the portion 33 is also formed as an upset zone, which can be shaped for attachment to the collar 22 in the axial direction and thus in the direction of the axis A, so that it inverts over the free edge 26 of the collar 22.

In Fig. 8 is a perspective view of the device 28 according to Fig. 7 when viewed on the outside 9a.

In Fig. 9 is an embodiment of a device 28 is shown in a sectional view, in which the attachment or attachment element 29 is inserted in the form of the threaded rivet bearing bushing 18 in the hole 14.

Like not only when running in Fig. 9 , but also in the remarks in Fig. 6 to Fig. 8 can be seen, this attachment 29 comprises a deformable connection portion 32 which is provided due to its deformability for connection to the household appliance component formed as a first component in the form of the side wall 9. The connecting region 32 is formed in the context of the change in length in the direction of the longitudinal axis A, which is provided in particular for upsetting, for which purpose a shortenable in the direction of the axis A zone 36 is configured.

In the axial direction subsequent to this connection region 32 and with this in the axial direction not overlapping the thread 30 is provided, which for Screw coupling of the add-on element 29 with another second component, which is a different to the wall 9 different component, is provided.

The attachment element 29 is a one-piece powder metallurgy part, in particular an MIM component.

In particular, the thread 30 is an M16 thread or larger.

As can be seen, the connecting portion 32 is formed as a hollow cylinder, wherein in the embodiment in Fig. 9 the attachment element 29 is formed in a completely continuous channel-like hollow region 45 and thus is designed to be open at the opposite ends.

A wall thickness d1 of the connection region 32 is smaller than a wall thickness d2 of an element section adjoining the connection region 32 in the form of a first partial region 37, which corresponds to the section 34 in FIG FIGS. 7 and 8 equivalent.

In Fig. 10 is shown in a further schematic sectional view of the fixed end state of the attachment member 29 on the wall 9 in the hole 14, to which the connecting portion 32 is compressed and a bead 38 has formed, which projects radially beyond the free edge 26 of the collar 22 and on this rests.

In Fig. 11 is shown in a sectional view of another embodiment of a mounting element 29. This has in contrast to the embodiment according to FIGS. 9 and 10 no internal thread formed on an inner side, but a thread 30 formed as an external thread. The attachment element 29 is designed in this embodiment as an element with a draw bolt on which the thread 30 is formed.

In this embodiment, it can be seen that the thinner-walled connecting region 32 overlaps in the direction of the longitudinal axis A with the first partial region 37 having the thread 30, to which end a second partial region 40 having the connecting region 32, the section 33 in FIG FIGS. 7 and 8 corresponds, is circumferentially surrounded, so that the first portion 37 in the second portion 40 inside, however, spaced from an inside 41. As a result, the second component, which is to be connected to the thread 30, can also be introduced into a zone 39 in which the partial regions 37 and 40 overlap axially.

The connecting region 32 extends in this embodiment over the height h1.

In Fig. 12 is shown in a sectional view of another embodiment of a mounting element 29. In this embodiment, in contrast to the embodiment in Fig. 11 a thread 30 formed as an external thread only in a front end portion of a portion 37 and does not extend into the zone 39 in which the connecting portion 32, which is the second portion 40 associated, and the first portion 37 axially overlap. In addition, the thread diameter compared to the diameter of the adjoining portion of the first portion 37 is reduced. By such a configuration, in which thus the thread 30 is spaced apart in the axial direction by a height h2 to a flange outside 31 a, a spacer is formed.

In Fig. 13 is a further embodiment of an attachment member 29 shown in a sectional view. This is analogous to the comments in FIGS. 9 and 10 as formed with a continuous in the direction of the axis A hollow portion 45, wherein here in the difference between the embodiments in FIGS. 9 and 10 on the thread 30 opposite end no laterally and radially outwardly extending abutment flange 31 is formed, but a hollow cylindrical spacer 42 is formed. However, this attachment element 29 can also be used in a hole 14. As from the illustration in Fig. 13 can be seen, the hollow cylindrical spacer 42 has a larger diameter than the connecting portion 32 and the first portion 37 with the thread 30. The connecting portion 32 is according to the embodiments in FIG. 9 to FIG. 12 deformable, in particular in the direction of the axis A compressible.

In Fig. 14 is a sectional view of another embodiment of a mounting member 29 in the form of a bearing bush 18 is shown. In this embodiment, it is provided that the spacer 42 additionally has a second thread 43, which is different from the dimensioning of the thread 30. Of the Spacer 42 in the context of a third portion of the add-on element 29, which constitutes an end region, so that the second portion 40 having the connecting portion 32 in the axial direction between the portions 37 and the spacer formed as a third portion 42 is arranged nist. In the versions in FIGS. 13 and 14 If no axial overlap of the partial areas 37, 40, 42 is provided.
In at least one embodiment of the attachment element 29 according to FIG. 6 to FIG. 14 It is provided that in the connection region 32 at a defined position, a reduction of the wall thickness is formed relative to the wall thickness d1, according to the invention a defined groove 44 is designed so that the point at which the compression takes place, can be predetermined. The groove 44 may be completely circumferential or even partially circumscribed or pieced.
It can also be provided that the embodiments according to FIG. 9 to FIG. 14 are designed so that at least in the connecting region 32, an outer geometry 35 is formed, which has a polygonal, in particular a geometry with n = 6 corners, so that they fit into the hole 14 as shown in FIG FIG. 3 to FIG. 5 can be used.
Likewise, however, embodiments may be provided which are designed corner-free, in particular rotationally symmetrical to the axis A at the connecting portion 32 and then also preferably just fit into a correspondingly shaped hole 14 to 17 are used.

LIST OF REFERENCE NUMBERS

1

oven

2

hob

3,4,5,6

cooking zones

7

oven

8th

muffle

9

Side wall

9a

outside

9b

inside

10

Side wall

11

bottom wall

12

ceiling wall

13

rear wall

14, 15, 16, 17

holes

18, 19

bushings

20

hook in racks

20a, 20b

guide bars

20c

retaining bar

21

body

22

collar

23

boundary edge

24

palm

24a, 24b, 24c

Inner surface portions

25a, 25b, 25c

contours sections

26

edge

27

transitions

28

contraption

29

Add-on unit

30

thread

31

abutment

31a

Flanschaußenseite

32

connecting area

33

section

34

section

35

function body

36

Zone

37

subregion

38

bead

39

Zone

40

subregion

41

inside

42

spacer

43

Second thread

44

groove

45

hollow area

A

longitudinal axis

d1

wall thickness

d2

wall thickness

h, h2

height

Claims (9)

1. Attachment element (18, 19, 29) for a domestic appliance (1), which has a deformable connecting area (32) for connecting the attachment element (18, 19, 29) to a first component (9 to 13) of the domestic appliance (1), and at least one thread (30, 43) for the threaded coupling of the attachment element (18, 19, 29) to a second component (20), wherein the attachment element (18, 19, 29) is embodied as a metal part, and the connecting area (32) has a zone (39) which can be shortened in the direction of the longitudinal axis (A) of the attachment element (18, 19, 29) by means of compression, wherein the connecting area (32) is embodied to be compressed in an end state of the attachment element (18, 19, 29) fastened to the first component (9 to 13) such that a bulge (38) has formed, which projects radially beyond a free edge (26) of a collar (22) of the first component (9 to 13) or rests hereupon, characterised in that the attachment element (18, 19, 29) is embodied as a powder metallurgy part and as a metal injection moulding component, and in that the connecting area (32) is embodied as a hollow section which has a wall thickness (d1) which is smaller than a wall thickness (d2) of subareas (37, 42) adjoining the connecting area (32) and wherein viewed in the axial direction the wall thickness (d1) in the connecting area (32) is varied at least once and wherein the thickness variation is formed by a groove (44).
2. Attachment element (18, 19, 29) according to claim 1, characterised in that it is embodied in one piece.
3. Attachment element (18, 19, 29) according to one of the preceding claims, characterised in that the thread (30, 43) is greater than or equal to M16.
4. Attachment element (18, 19, 29) according to one of the preceding claims, characterised in that a first subarea (37) of the attachment element (18, 19, 29) having a thread (30) is embodied to overlap with a second subarea (40) having the deformable connecting area (32) in the axial direction.
5. Attachment element (18, 19, 29) according to one of claims 1 to 3, characterised in that a first subarea (37) of the attachment element (18, 19, 29) having a thread (30) is embodied without an overlap with a second subarea (40) of the attachment element (18, 19, 29) having the deformable connecting area (32) in the axial direction.
6. Attachment element (18,19, 29) according to claim 4 or 5, characterised in that viewed in the axial direction the second subarea (40) is arranged between the first subarea (37) and a third subarea (42) having a further thread (43).
7. Attachment element (18, 19, 29) according to one of the preceding claims, characterised in that viewed in the peripheral direction a subarea (40) of the attachment element (18, 19, 29) having the connecting area (32) has a polygonal external geometry embodied in particular with a number n with 3 ≤ n ≤ 8 corners.
8. Device (28) for a domestic appliance (1) which has at least one attachment element (18, 19, 29) according to one of the preceding claims, which is inserted and fastened into a hole (14 to 17) of a domestic appliance component of the device (28) embodied as a first component (9 to 13).
9. Domestic appliance (1) for preparing food, having a cooking compartment (7) delimited by a muffle (8), which has side walls (9, 10) embodied as first components, into which holes (14 to 17) are embodied, and in at least one hole (14 to 17) an attachment element (18, 19, 29) according to one of claims 1 to 8 is arranged.

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