Holding device and method for fixing functional element and cooking utensil with holding device

Abstract

The invention relates to a holding device (2) for positioning and securing a functional element in a bore (34) of a cooking chamber wall (26, 28, 30), comprising a base body which can be inserted into the bore (34) and can be inserted axially therethrough, the base body having a channel (4) extending in the axial direction (L) of the base body, the functional element can be inserted into the channel and has a radially outer receiving section (12) which receives an inner edge of the through-hole (34) in the inserted state. The channel (4) has a clamping section (K2), the diameter (D2) of the clamping section is smaller than the diameter (D1) of the functional element and is dimensioned in such a way that the clamping section (K2) can be elastically expanded radially outward when the functional element is inserted into the channel (34) and the functional element and the base body can be fixed to the through-hole (34) in a fluid-tight and / or gas-tight and self-clamping manner by means of a clamping force. The invention further relates to a cooking appliance (22) and to a method for fastening and sealing a functional element.

Description

Field of the Invention

[0001] The present disclosure relates to a holding device for fixing a functional element, a cooking appliance having the holding device and the functional element, and a method for loading / installing the functional element in the cooking appliance.

[0002] In conventional cooking appliances, the lighting device is configured with halogen light-emitting devices that illuminate the cooking chamber of the cooking appliance. The halogen light-emitting devices are arranged in the cooking chamber of the cooking appliance.

[0003] Recently, the technology of lighting devices has evolved to use LED lighting devices that are more durable and energy-efficient than conventional halogen light-emitting devices for lighting. Since directly arranging the LED light-emitting devices in the cooking chamber would bring different technical problems, especially thermal problems, a light conductor is constructed to conduct the light emitted by the LED light-emitting devices into the cooking chamber. The light conductor is fixed in the cooking chamber wall portion that defines the cooking chamber by a holding element. In addition, a sealing element configured separately from the holding element is constructed to seal the transition portion between the cooking chamber wall portion and the light conductor.

[0004] One such cooking appliance is disclosed, for example, in DE 202021100375 U1. DE202021100375U1 discloses a cooking appliance having a cooking chamber and a lighting device with a light guide rod. A notch is constructed in the cooking chamber wall portion. A holding plate with a receiving opening for the lighting device is constructed in the notch. The holding plate is configured with a separate sealing element that has a receiving portion for the light guide rod. With this (multi-piece) configuration, the installation of the light guide rod and the holding plate becomes difficult. In addition, potential corrosion-causing bacterial sites are provided by the planar contact between the holding plate and the cooking chamber wall portion. The light guide rod also only contacts linearly in the receiving portion, such that the light guide rod must be guided and fixed by other components.

[0005] Therefore, the object of the present invention is to eliminate or at least reduce the disadvantages in the prior art. Specifically, the object of the present invention is to provide a holding device that enables the fixing and sealing of a functional element, especially in the form of a light guide rod / light conductor, in the cooking chamber wall portion, and can be simply and inexpensively manufactured and installed.

[0006] This object is solved by a holding device according to claim 1 and by a cooking appliance and a method according to the dependent claims. Advantageous refinements of the present invention are in the dependent claims and are described below.

[0007] Specifically, this task is solved by a holding device for positioning and fixing a functional element, in particular a cylindrical section of a functional element, preferably an optical conductor, in a perforation / gap in a wall section, in particular in the cooking chamber wall of a cooking appliance. The holding device has a rotationally symmetric base body which can be inserted into the perforation and is inserted axially through the perforation. The base body has a central channel extending along the axial direction of the base body and a receiving section arranged radially outside, wherein the functional element can be inserted into the central channel and the receiving section receives the inner edge of the perforation in the inserted state. The channel has a clamping section with a diameter smaller than the diameter of the functional element and dimensioned such that when the functional element is inserted into the channel, the clamping section can elastically expand radially outwards, and by the applied radial clamping force, the functional element and the base body can be fixed fluid-tightly and / or gastight and self-clamped on the perforation.

[0008] In other words, this task is solved by a holding device having a channel. The channel preferably runs through the holding device at its center along the longitudinal axis extending in the axial direction of the holding device. The channel at least includes a clamping section. The cross-section of the channel oriented normal to the longitudinal axis is preferably circular at every location. Other geometries of the cross-section, such as square or hexagonal, are also conceivable, provided that the cross-section of the channel must be coordinated with the geometry of the functional element.

[0009] The diameter of the channel in the clamping section is smaller than the diameter of the functional element to be fixed and sealed by the holding device. In addition, the holding device includes a receiving section which is provided and configured to connect the holding device to the cooking chamber wall. The receiving section is configured in and / or at the circumferential wall of the holding device. The receiving section is arranged spaced apart from the clamping section in the direction of the longitudinal axis. The clamping section is configured to expand radially when the functional element is inserted into the channel of the holding device. Once again in other words, the clamping section is configured to increase its radial extent when the functional element is inserted, wherein at least the radial clamping force connects the functional element and the holding device to each other. In addition, the force-locking connection between the perforation and the holding device is at least constructed / enhanced by the radial expansion of the clamping section.

[0010] With this configuration of the device, the device can fix, seal and guide the optical conductor. In addition, such a device can be manufactured at low cost and can be simply installed.

[0011] In a first aspect, the receiving section can be defined by a preferably circumferential raised section in at least one axial direction, preferably in the insertion direction, and the clamping section can be arranged radially within the raised section, such that when the clamping section is expanded by the functional element, the raised section can also elastically expand radially outwards and enhance or at least achieve an axial form-fit with the perforation, which axial form-fit can only be released by removal of the functional element.

[0012] In other words, the raised section can be formed adjacent to the receiving section on the circumferential wall of the retaining device, and the raised section extends radially away from the channel. The raised section can be constructed along the longitudinal direction at the height of the clamping section. The raised section can be expanded radially by insertion of the functional element and can thus be placed in the locking position. In the locking position, the retaining device can be form-fittingly connected to the perforation in the wall section.

[0013] In another aspect, the raised section can be formed by a circumferential locking edge, the outer diameter of which is greater than the inner diameter of the perforation, and the locking edge is dimensioned such that when the base body is inserted into the perforation without the functional element, the locking edge elastically deflects / indents radially inwards and can subsequently be form-fittingly latched onto the perforation (Durchzug).

[0014] In other words, the raised section can be constructed as an elastic locking edge, which is arranged and constructed for: preferably form-fittingly latching in the perforation according to the barb principle. Here, the locking edge can be constructed such that the insertion of the retaining device into the perforation can be achieved without tools.

[0015] In another aspect, the channel can have / include a contact section, which can be arranged radially within the receiving section and has a diameter that substantially corresponds to the diameter of the cylindrical section of the functional element.

[0016] In other words, the channel can include at least one contact section, which can be arranged in front of the clamping section along the insertion direction of the functional element. The contact section can have a larger diameter than the clamping section. In particular, the diameter of the contact section can correspond to the diameter of the cylindrical section of the functional element or can be slightly smaller than the diameter of the cylindrical section of the functional element.

[0017] In another aspect, the channel can be provided with a radius and / or a chamfer in the region adjacent to the contact section of the clamping section.

[0018] In other words, the diameter change from the contact section to the clamping section can be formed by a radius and / or a chamfer.

[0019] With this configuration, the manufacture of the holding device can be significantly simplified, since the radius and / or the chamfer act as profiling bevels during the manufacturing process. Furthermore, with this configuration, the insertion or insertion of the functional element into the holding device can be simplified, and the functional element can be prevented from skewing at the transition between the contact section and the clamping section.

[0020] On the other hand, the receiving section can be delimited by a preferably circumferential stop in a direction opposite to the insertion direction of the base body, and the receiving section can be configured as a groove between the raised section and the stop, where the groove width preferably corresponds to the length of the perforation or the thickness of the wall section.

[0021] In other words, the receiving section can be configured as a groove extending radially inwards in the outer wall of the holding device, where the groove can be delimited by a circumferential stop and a raised section along the longitudinal direction of the holding device. The spacing between the stop and the raised section can correspond to the length of the perforation or the thickness of the wall section, where the length of the perforation corresponds to the extent of the extension of the perforation normal to the wall section. Here, the groove can be configured as a substantially rectangular recess.

[0022] On the other hand, the base body can have an insertion chamfer on the outer side in the insertion direction; and / or the channel can have an insertion section that is preferably tapered on the side opposite to the insertion direction.

[0023] In other words, the holding device can further include an insertion section in which the channel preferably tapers towards the contact section.

[0024] Once again in other words, the holding device can also include an insertion section in the channel, in which the channel tapers from the insertion opening of the channel towards the contact section. The insertion section can be configured on the side of the contact section facing away from the clamping section along the direction of the longitudinal axis.

[0025] Furthermore, the holding device can include an insertion chamfer that is configured at the end of the holding device facing away from the insertion opening. The insertion chamfer can be a tapered constriction of the outer contour of the holding device.

[0026] With this insertion section, the installation of the functional element in the holding device can be significantly simplified for the fitter. The enlarged insertion opening significantly facilitates insertion, especially in the installation position where the fitter cannot directly see the insertion opening. Due to the tapered shape of the insertion section, the functional element can be centered in the holding device during installation.

[0027] On the other hand, the holding device can be made of a thermally stable elastomer in a material-integrated manner.

[0028] In other words, the retaining device can be made of exactly one material without interruption as a whole, where the material is an elastomer that is heat-resistant at least in the temperature range achievable in the cooking appliance.

[0029] Due to this configuration of the retaining device, the retaining device can be manufactured at low cost, has good sealing properties, can be inserted into a wall portion or a perforation without tools, and can be deformed by a functional element in a predefined area.

[0030] On the other hand, the minimum wall thickness of the retaining device can be 2 mm, and the maximum wall thickness of the retaining device can be 10 mm.

[0031] On the other hand, the axial extent of the clamping section of the retaining device can be smaller than the axial extent of the contact section of the retaining device.

[0032] On the other hand, the retaining device can have a substantially funnel-shaped geometry.

[0033] The retaining device can also include more than one clamping section and / or more than one receiving section and / or more than one contact section. For example, (along the insertion direction of the functional element), contact sections can be formed not only in front of the clamping section but also behind the clamping section.

[0034] On the other hand, the clamping section and the receiving section can at least partially overlap in the axial direction of the retaining device. In this way, an improved sealing effect between the retaining device and the perforation can be achieved, especially in the transition region between the receiving section and the protruding section.

[0035] On the other hand, the diameter of the clamping section can be between 5% and 20% smaller than the diameter of the contact section. Particularly preferably, the diameter of the clamping section is approximately 10% smaller than the diameter of the contact section, so that elastic deformation of the clamping section without tools can be achieved by the functional element while the clamping force is high.

[0036] Furthermore, the object of the present invention is solved by a cooking appliance, preferably a steaming appliance, which has a retaining device according to one of the above aspects and a functional element, in particular an optical conductor, where the functional element is positively fixed in the clamping section of the retaining device, and the retaining device is positively and preferably form-fittingly fixed in a perforation, especially in the upper side, of the cooking chamber wall of the cooking appliance.

[0037] In other words, the task is additionally solved by a cooking appliance equipped with a holding device according to the invention, wherein the holding device is connected to the cooking chamber wall in a form-fitting and / or force-fitting manner and is force-fittingly connected to the functional element. In the assembled state, the system consisting of the functional element and the holding device hermetically closes the opening / perforation in the cooking chamber wall. The functional element is in full contact here via the clamping section of the holding device and preferably also via the contact section, wherein the radially acting clamping force is exerted on the functional element by the clamping section.

[0038] In one aspect, the diameter of the contact section can correspond to the diameter of the functional element.

[0039] In other words, the inner contour of the contact section can correspond to the outer contour of the functional element.

[0040] As an alternative, it can be envisaged that the first diameter of the contact section is slightly smaller than the diameter of the functional element. For example, an interference fit can be formed between the contact section and the functional element.

[0041] With this configuration of the contact section and the functional element, guidance of the functional element in the holding device can be ensured.

[0042] In another aspect, when the holding device is fixed in the opening in the cooking chamber wall in a force-fitting and form-fitting manner, the clamping section of the holding device can be arranged in the cooking chamber of the cooking appliance.

[0043] In other words, the holding device can be fixed in the opening in the cooking chamber wall such that the clamping section, preferably configured with latching edges, is arranged in the cooking chamber. The holding device can penetrate into the cooking chamber by a maximum of 10 mm, preferably a maximum of 5 mm, and particularly preferably a maximum of 2 mm. This small protrusion of the holding device or the functional element into the cooking chamber is responsible for a smooth appearance and makes it easier for the user to clean the cooking chamber.

[0044] In another aspect, the clamping section of the holding device can be deformed / deformable by the functional element such that the latching edges expand radially in the cooking chamber by the functional element and effectively prevent the holding device from being removed from the opening in the cooking chamber wall. Once again in other words, with the insertion of the functional element into the holding device, the holding device can in particular expand further in the clamping section, and a clamping force is generated / increased between the functional element, the holding device, and the cooking chamber wall. Thus, the holding device is elastically clamped and self-clamps as a result of the insertion of the functional element into the holding device.

[0045] In this way, additional clamping elements can be dispensed with, and nevertheless, accidental loosening of the connection can be prevented during proper use. Furthermore, with this construction, the cutting edges of the openings in the cooking chamber wall are covered by the retaining means, whereby the cooking chamber wall is protected against corrosion at these particularly vulnerable sites. In addition, the risk of injury caused by the user of the cooking appliance to the sharp edges of the openings is minimized.

[0046] Furthermore, the object of the present invention is achieved by a method for positioning and fixing a functional element, in particular a cylindrical section of a functional element, in particular an optical conductor, in a perforation in a wall section, in particular a cooking chamber wall of a cooking appliance, by means of a retaining means, the method having the following steps:

[0047] - Inserting the retaining means into the perforation in the cooking chamber wall such that the cooking chamber wall is received in the receiving section, preferably a groove, of the retaining means;

[0048] - Inserting the functional element into the channel of the retaining means;

[0049] - Expanding the clamping section of the retaining means by means of the functional element, thereby pressing the retaining means against the perforation.

[0050] In other words, in the method according to the invention, the device is first inserted into the cooking chamber wall, and subsequently, by inserting the optical conductor into the through-hole of the device, the device is elastically deformed, and in this way, an airtight fixing of the optical conductor in the cooking chamber wall is achieved by means of the device. Description of the Drawings

[0051] Figure 1 A cross-sectional view of the device according to the invention is shown;

[0052] Figure 2 An illustration of a cooking appliance according to the invention, having a retaining means and an optical conductor element, in an uninstalled state is shown;

[0053] Figure 3 An enlarged cross-sectional view of a cooking appliance according to the invention, having a retaining means and an optical conductor element, in an installed state is shown;

[0054] Figure 4 A first illustration of the insertion process of the optical conductor element into the retaining means is shown; and

[0055] Figure 5 A second illustration of the insertion process of the optical conductor element into the retaining means is shown. Detailed Description of the Invention

[0056] The embodiments of the present disclosure will be described below with reference to the accompanying drawings.

[0057] Figure 1 The holding device 2 according to the invention is shown in a sectional view, the section containing the longitudinal axis L of the holding device 2. The holding device 2 is integrally formed rotationally symmetrically about the longitudinal axis L. The holding device 2 has a straight through-hole / channel 4 extending in the longitudinal direction along the longitudinal axis L. The straight through-hole 4 is provided and configured to receive an optical conductor (see Figure 2 38 in

[0058] ). The holding device 2 includes an insertion section E configured in the straight through-hole 4, in which the cross-section of the straight through-hole 4 tapers conically starting from the insertion opening 6. In other words, the insertion section E is configured in a funnel shape. On the side of the insertion section E facing away from the insertion opening 6, the straight through-hole 4 forms together with a contact section K1.

[0059] The straight through-hole 4 in the contact section K1 has a constant first diameter D1. The first transition 8 from the insertion section E to the contact section K1 is configured as a radius. On the side of the straight through-hole 4 facing away from the insertion section E, a clamping section K2 adjoins the contact section K1. The straight through-hole 4 in the clamping section K2 has a constant second diameter D2. The second diameter D2 is smaller than the first diameter D1. The second transition 10 configured between the contact section K1 and the clamping section K2 is configured as a radius. Figure 2 Figure 2 In addition, the holding device 2 includes a receiving section in the form of a groove 12, which is configured in the outer surface 14 of the holding device 2. The groove 12 is substantially configured at the height of the contact section K1 along the longitudinal direction L, and is provided and configured to form-fitly receive a furnace wall section (e.g.,

[0060] Figure 2 the cover 28 in ). The groove 12 is configured completely circumferentially in / at the outer surface 14 of the holding device 2, where the groove 12 extends starting from the outer surface 14 substantially normal to the longitudinal axis L. The groove 12 is defined in the direction towards the insertion opening 6 by an abutment surface 16, which is oriented substantially normal to the longitudinal axis L. In the direction away from the insertion opening 6, the groove 12 is defined by a latching edge 18. In addition, the holding device 2 includes an insertion chamfer 20, which is configured on the outer surface 14 at the end section of the holding device 2 facing away from the insertion opening 6, and facilitates the installation of the holding device 2 into a furnace wall section (seeFigure 2 For better illustration, it is shown in the uninstalled state. The lighting device 36 includes a light conductor 38 and a light source 40, and the light source is preferably configured as at least one LED with a cooling body. The light conductor 38 is connected to the light source 40 such that the light emitted by the light source 40 is incident into the first end of the light conductor 38, guided by the light conductor 38, and exits the light conductor 38 through the second end of the light conductor 38, wherein the second end of the light conductor 38 is arranged in the cooking chamber 32 in the installed state.

[0061] Of course, as an alternative or supplement, the internal space perforation 34 can also be configured in one or both side walls of the side wall 26 and / or in the bottom 30 of the baking tube 24.

[0062] Figure 3 An enlarged partial view of a cross-section of the steam cooking appliance 22 is shown, wherein the lighting device 36 and the holding device 2 are in the installed state. In the installed state shown here, the light conductor 38 is fully contacted by the contact section K1. In addition, the light conductor 38 is fully clamped radially by the clamping section K2 in the installed state. In other words, a clamping force acting radially on the light conductor 38 is applied by the clamping section K2. The cover 28 of the baking tube 24 is received in a form-locking manner in the groove 12 of the holding device 2. The holding device 2 is fixed by the locking edge 18 which is elastically deformed radially outwards via the light conductor 38 to prevent accidental loosening from the baking tube 24. In the installed state, the through-hole 4 has a first diameter D1 both in the contact section K1 and in the clamping section K2. In other words, the clamping section K2 is deformed by the light conductor 38 such that the diameter of the through-hole 4 in the contact section K1 and the clamping section K2 is constant. The locking edge 18 arranged along the height of the clamping section K2 in the longitudinal direction L is thus deformed / expanded radially outwards. The locking edge 18 is completely arranged in the cooking chamber 32 of the cooking appliance 22 in the installed state, wherein the locking edge 18 only extends into the cooking chamber 32 by a few millimeters.

[0063] The following is with the aid of Figures 1 to 5 to describe the installation / installation process of the light conductor 38.

[0064] In the first step, the holding device 2 is introduced into the internal space perforation 34 arranged in the cover 28 of the baking tube 24. For this purpose, with a force applied to the holding device 2, the insertion chamfer 20 is placed on the internal space perforation 34 and the force is continuously increased until the locking edge 18 is elastically deformed and the groove 12 receives the cover 28 of the baking tube 24. The holding device 2 is now connected to the baking tube 24 in a form-locking manner.

[0065] Then, in a second step, the lighting device 36 is installed. For this purpose, the optical waveguide 38 is introduced into the insertion section E through the insertion opening 6. Due to the conically ending shape of the insertion section E, the optical waveguide 38 is centered by the insertion section E during insertion in the direction of the longitudinal axis L of the holding device 2, so that the optical waveguide 38 is completely centered at the height of the first transition section 8 at the latest. Then, the optical waveguide 38 is pushed into the contact section K1, which contacts the optical waveguide 38 all around and guides it (see Figure 4 ).

[0066] As soon as the optical waveguide reaches the second transition 10, a deforming force must be applied by the assembler. The deforming force must be so great that the circumferential latching edge 18 is pressed radially outward by the optical waveguide 38 and deforms elastically in the process. The deformation is caused by Figure 4 , the deformation direction 42 is indicated by an arrow. As a result, the form fit between the holding device 2 and the cover 38 of the baking tube 24 is further enhanced. The latching edge 18 is deformed radially outwards away from the longitudinal axis. At the same time, a clamping force is applied to the optical waveguide 38 by the elastic deformation of the clamping section K2, which is responsible for the force-locking connection between the optical waveguide 38 and the holding device 2. The contact section K1 and the clamping section K2 now both have a first diameter D1 (see Figure 5 ).

[0067] It is then not possible to remove the holding device 2 from the interior opening 34 without first removing the light conductor 38 from the holding device 2. The holding device 2 seals the interior opening 34 in a gas-tight manner via the groove 12 and the latching edge 18. Furthermore, the light conductor 38 is sealed in a gas-tight manner relative to the holding device 2 in the region of the contact section K1 and the clamping section K2.

[0068] Overall, the holding device 2 according to the invention makes it possible to fix the light guide 38 in the cover 38 of the baking tube 24 and simultaneously seal the baking tube 24 .

[0069] List of reference numerals:

[0070] 2 Holding device

[0071] 4 through holes

[0072] 6 Insertion port

[0073] 8First transition section

[0074] 10 Second transition section

[0075] 12 slots

[0076] 14 External surface

[0077] 16 Abutment surface

[0078] 18 Latching edge

[0079] 20 Insertion chamfer

[0080] 22 Cooking appliance

[0081] 24 Baking tube

[0082] 26 Side wall

[0083] 28 Cover

[0084] 30 Bottom

[0085] 32 Cooking chamber

[0086] 34 Internal space perforation

[0087] 36 Lighting device

[0088] 38 Light conductor

[0089] 40 Light source / LED

[0090] 42 Deformation direction

[0091] L Longitudinal axis

[0092] E Insertion section

[0093] K1 Contact section

[0094] K2 Clamping section

[0095] D1 First diameter

[0096] D2 Second diameter

Claims

1. A holding device (2) for positioning and fixing a functional element, in particular a cylindrical section of the functional element, preferably an optical conductor (38), in a perforation (34) of a wall section, in particular a cooking chamber wall section (26, 28, 30) of a cooking appliance (22), having a substantially rotationally symmetric base body which can be inserted into the perforation (34) and axially through the perforation, wherein the base body has: a central channel (4) extending along the axial direction (L) of the base body, into which the functional element can be inserted; and a radially outer receiving section (12) which, in the inserted state, receives the inner edge of the perforation (34); characterized in that the channel (4) has a clamping section (K2) whose diameter (D2) is smaller than the diameter (D1) of the functional element and is dimensioned such that, when the functional element is inserted into the channel (34), the clamping section (K2) can elastically expand radially outwards and, by the applied radial clamping force, the functional element and the base body can be fixed fluid-tightly and / or gastight and self-clamping on the perforation (34).

2. The holding device (2) according to claim 1, characterized in that, The receiving section (12) is defined in at least one axial direction, preferably along the insertion direction, by a preferably circumferential raised section (18), and the clamping section (K2) is arranged radially within the raised section (18) such that, when the clamping section (K2) expands by the functional element, the raised section (18) can also elastically expand radially outwards and achieve an axial form-fit with the perforation (34), which axial form-fit can only be released by removal of the functional element.

3. The holding device (2) according to claim 2, characterized in that, The raised section (18) is formed by a circumferential locking edge whose outer diameter is greater than the inner diameter of the perforation, and the locking edge is dimensioned such that, when the base body is inserted into the perforation without the functional element, the locking edge elastically deflects radially inwards and then form-fits and locks on the perforation.

4. The holding device (2) according to any one of claims 1 to 3, characterized in that, The channel has a contact section (K1) which is arranged radially within the receiving section (12) and has a diameter (D1) corresponding approximately to the diameter of the cylindrical section of the functional element.

5. The holding device (2) according to claim 4, characterized in that, The channel (4) is provided with a radius and / or chamfer in the region of the clamping section (K2) adjacent to the contact section (K1).

6. The holding device (2) according to any one of claims 1 to 5, characterized in that, The receiving section (12) is defined in the direction opposite to the insertion direction of the base body by a preferably circumferential stop (16), and the receiving section (12) is configured as a groove between the raised section (18) and the stop (16), wherein the groove width preferably corresponds to the length of the perforation (34) or the thickness of the wall section.

7. The holding device (2) according to any one of claims 1 to 6, characterized in that, The base body has an insertion chamfer (20) on the outer side in the insertion direction; and / or The channel (4) has an insertion section (E) which preferably tapers conically on the side opposite to the insertion direction.

8. The holding device (2) according to any one of claims 1 to 7, characterized in that, The holding device (2) is made of a thermally stable elastomer in one piece.

9. A cooking appliance (22), preferably a steaming appliance, having a holding device (2) according to any one of claims 1 to 8 and a functional element, in particular a light conductor (38), wherein the functional element is positively fixed in the clamping section (K2) of the holding device (2), and the holding device (2) is positively and preferably form-fittingly fixed in a perforation (34) in the cooking chamber wall (26, 28, 30) of the cooking appliance (22), in particular in the upper side (28).

10. A method for positioning and fixing a functional element, in particular a cylindrical section of the functional element, in particular a light conductor (38), in a perforation (34) in a wall section, in particular in the cooking chamber wall (26, 28, 30) of a cooking appliance (22), using a holding device (2), having the following steps: - Inserting the holding device (2) into a perforation (34) in the cooking chamber wall (26, 28, 30) such that the cooking chamber wall (26, 28, 30) is received in the receiving section (12), preferably a groove, of the holding device (2); - Inserting the functional element into the channel (4) of the holding device (2); - Expanding the clamping section (K2) of the holding device (2) by means of the functional element, such that the holding device (2) is fluid-tight and / or gas-tight pressed in the perforation (34).

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