Holding device, method for fixing a functional element, and cooking device comprising same

Abstract

The invention relates to a holding device (2) for positioning / fixing a functional element in an eyelet (34) of a cooking chamber wall (26, 28, 30), comprising a main part which can be inserted into the eyelet (34) and pass axially through same, wherein the main part has a passage (4) which extends in the axial direction (L) of the main part and into which the functional element can be inserted and which has a radially outer receiving section (12) that receives an inner edge of the eyelet (34) in the inserted state. The passage (4) has a clamping section (K2), the diameter (D2) of which is smaller than the diameter (D1) of the functional element and is dimensioned such that when the functional element is inserted into the passage (34), the clamping section (K2) is elastically expanded radially outwards, and the functional element and the main part can be fixed to the eyelet (34) in a fluid- and / or gas-tight manner as well as in a self-clamping manner by means of the clamping force. The invention additionally relates to a cooking device (22) and to a method for fixing and sealing the functional element.

Description

[0001] Holding device and method for fixing a functional element and cooking appliance therewith

[0002] Description

[0003] Technical area

[0004] The present disclosure relates to a holding device for fixing a functional element, a cooking appliance with the holding device and the functional element and a method for inserting / mounting the functional element in the cooking appliance.

[0005] Conventional cooking appliances use halogen lamps to illuminate the cooking chamber. The halogen lamps are located inside the cooking chamber.

[0006] Recently, lighting technology has evolved toward LED lighting, which is more durable and energy-efficient than conventional halogen bulbs. Since arranging LED lighting directly in the cooking chamber would pose various technical problems, particularly thermal problems, light guides are designed to guide the light emitted by the LED lighting into the cooking chamber. The light guide is fixed in a cooking chamber wall, which defines the cooking chamber, via a holding element. Furthermore, a sealing element, formed separately from the holding element, is designed to seal the transition between the cooking chamber wall and the light guide.

[0007] Such a cooking appliance is disclosed, for example, in DE 202021 100 375 U1. DE 20 2021 100 375 U1 discloses a cooking appliance with a cooking chamber and a lighting device with a light-guiding rod. An opening is formed in a cooking chamber wall. A holding plate with a receiving opening for the lighting device is formed in the opening. The holding plate is formed with a separate sealing element with a receptacle for the light-guiding rod. Such a (multi-part) design makes assembly of the light-guiding rod and the holding plate more difficult. Furthermore, surface contact between the holding plate and the cooking chamber wall creates a potential source of corrosion. Furthermore, the light-guiding rod only makes approximately linear contact in the receptacle, meaning that the light-guiding rod must be guided and secured through additional components.The object of the present invention is therefore to eliminate or at least reduce the disadvantages of 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, in particular in the form of a light guide rod / light guide, in a cooking chamber wall, while being simple and cost-effective to manufacture and assemble.

[0008] This object is achieved by a holding device according to claim 1, as well as by a cooking appliance and a method according to the independent claims. Advantageous developments of the invention are described in the subclaims and below.

[0009] Specifically, the problem is solved by a holding device for positioning and securing a functional element, in particular a cylindrical portion of the functional element, preferably a light guide, in a passage / opening of a wall, in particular a cooking chamber wall of a cooking appliance, having a base body, in particular a rotationally symmetrical one, which can be axially inserted into the passage and penetrates it. The base body has a central passage extending in the axial direction of the base body, into which the functional element can be inserted, and a receiving portion arranged radially outwardly, which, when inserted, receives an inner edge of the passage.The passage has a clamping section whose diameter is smaller than the diameter of the functional element and is dimensioned such that when the functional element is inserted into the passage, the clamping section can be elastically expanded radially outwards and the functional element and the base body can be fixed to the passage in a fluid-tight and / or gas-tight and self-clamping manner by the applied radial clamping force.

[0010] In other words, the problem is solved by the holding device having the passage. The passage penetrates the holding device, preferably centrally, along the longitudinal axis of the holding device extending in the axial direction. The passage contains at least the clamping section. A cross-sectional area of ​​the passage oriented normal to the longitudinal axis is preferably circular at every point. Other geometries of the cross-sectional area, for example square or hexagonal, are also conceivable, although the cross-sectional area of ​​the passage must be matched to a geometry of the functional element. The diameter of the passage in the clamping section is smaller than the diameter of the functional element to be fixed and sealed by the holding device. The holding device further contains the receiving section, which is designed to connect the holding device to the cooking chamber wall.The receiving section is formed in and / or on a peripheral wall of the holding device. The receiving section is arranged at a distance from the clamping section in the direction of the longitudinal axis. The clamping section is designed to be radially expanded upon insertion of the functional element into the passage of the holding device. In other words, the clamping section is designed to increase its radial extent upon insertion of the functional element, wherein at least the radial clamping force connects the functional element and the holding device to one another. Furthermore, the radial expansion of the clamping section creates / reinforces at least one frictional connection between the passage and the holding device.

[0011] This design allows the device to fix, seal, and guide the optical fiber. Furthermore, such a device is inexpensive to manufacture and easy to install.

[0012] In a first aspect, the receiving section can be delimited in at least one axial direction, preferably in an insertion direction, by a preferably circumferential projection section and the clamping section can be provided radially inside the projection section, so that when the clamping section is spread open by the functional element, the projection section can also be elastically spread radially outwards and reinforces or at least enters into an axial positive connection with the passage, which can only be released by removing the functional element.

[0013] In other words, the projection portion, which extends radially away from the passage, can be formed on the peripheral wall of the holding device, adjacent to the receiving portion. The projection portion can be formed in the longitudinal direction at the level of the clamping portion. The projection portion can be radially expandable by inserting the functional element and can thereby be brought into a locking position. In the locking position, the holding device can be positively connected to the passage of the wall.

[0014] In a further aspect, the projection section can be formed by a circumferential locking edge whose outer diameter is larger than the inner diameter of the passage and which is dimensioned such that when the base body is inserted into the passage without a functional element, the locking edge elastically deflects / is reset radially inwards and can then lock positively onto the passage.

[0015] In other words, the projection portion can be designed as an elastic locking edge, which is provided and configured to engage positively in the passage, preferably according to a barb principle. The locking edge can be designed in such a way that tool-free insertion of the holding device into the passage is possible.

[0016] In a further aspect, the passage may have / include a contact portion that may be provided radially inside the receiving portion and has a diameter that substantially corresponds to the diameter of the cylindrical portion of the functional element.

[0017] In other words, the passage may contain at least one contact section, which may be arranged in front of the clamping section in the insertion direction of the functional element. The contact section may have a larger diameter than the clamping section. In particular, the diameter of the contact section may correspond to the diameter of the cylindrical section of the functional element or be slightly smaller.

[0018] In a further aspect, the passage may be provided with a radius and / or a chamfer in a region of the clamping section adjacent to the contact section

[0019] In other words, a change in diameter from the contact portion to the clamping portion can be formed by the radius and / or the chamfer.

[0020] Such a design can significantly simplify the manufacture of the holding device, as the radius and / or chamfer can act as a draft angle during the manufacturing process. Furthermore, such a design can simplify the insertion or insertion of the functional element into the holding device and prevent the functional element from tilting at the transition between the contact section and the clamping section.

[0021] In a further aspect, the receiving section can be limited in a direction opposite to the insertion direction of the base body by a preferably circumferential stop and the receiving section can be designed as a groove between the projection section and the stop, wherein a groove width preferably corresponds to the length of the passage or the thickness of the wall.

[0022] In other words, the receiving portion can be formed as a groove extending radially inward in the outer wall of the holding device, wherein the groove can be delimited by the circumferential stop and the projection portion in the longitudinal direction of the holding device. A distance between the stop and the projection portion can correspond to the length of the passage or the thickness of the wall, wherein the length of the passage corresponds to an extension of the passage perpendicular to an extension of the wall. The groove can be formed as a substantially rectangular undercut.

[0023] In a further aspect, the base body may have an insertion bevel on the outer side lying in the insertion direction; and / or the passage may have a preferably conically tapered insertion section on the side opposite the insertion direction.

[0024] In other words, the holding device may further include the insertion section in which the passage tapers towards the contact section, preferably conically.

[0025] In other words, the holding device can further include the insertion section in the passage, in which the passage tapers from an insertion opening of the passage toward the contact section. The insertion section can be formed in the direction of the longitudinal axis on a side of the contact section facing away from the clamping section.

[0026] Furthermore, the holding device can include an insertion chamfer, which is formed at an end of the holding device facing away from the insertion opening. The insertion chamfer can be a conical taper of the outer contour of the holding device.

[0027] Such an insertion section can significantly simplify installation of the functional element in the holding device for a technician. The enlarged insertion opening makes insertion much easier, particularly in installation positions where a technician cannot directly see the insertion opening. The tapered shape of the insertion section allows the functional element to be centered in the holding device during assembly. In another aspect, the holding device can be formed as a single piece from a thermostable elastomer.

[0028] In other words, the holding device can be formed monolithically and without interruption from exactly one material, wherein the material is an elastomer which is thermostable at least in a temperature range achievable in the cooking appliance.

[0029] By designing the holding device in this way, the holding device can be manufactured cost-effectively, have good sealing properties, be inserted into the wall or passage without tools and be deformable in a predefined area by the functional element.

[0030] In a further aspect, a minimum wall thickness of the holding device may be 2 mm and a maximum wall thickness of the holding device may be 10 mm.

[0031] In a further aspect, an axial extension of the clamping portion of the holding device may be smaller than an axial extension of the contact portion of the holding device.

[0032] In a further aspect, the holding device may have a substantially funnel-shaped geometry.

[0033] The holding device may further include more than one clamping section and / or more than one receiving section and / or more than one contact section. For example, a contact section may be formed (in the insertion direction of the functional element) both in front of the clamping section and behind the clamping section.

[0034] In a further aspect, the clamping portion and the receiving portion can overlap, at least partially, in the axial direction of the retaining device. In this way, an increased sealing effect can be achieved between the retaining device and the passage, particularly in the transition area between the receiving portion and the projection portion.

[0035] In a further aspect, 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, thus enabling tool-free elastic deformation of the clamping section by the functional element while simultaneously maintaining a high clamping force.

[0036] The object of the present invention is further achieved by a cooking appliance, preferably a steam cooking appliance, with a holding device according to one of the above aspects and a functional element, in particular a light guide, wherein the functional element is fixed in a force-fitting manner in the clamping section of the holding device and the holding device is fixed in a force-fitting manner and preferably in a form-fitting manner in a passage of a cooking chamber wall, in particular in an upper side, of the cooking appliance.

[0037] In other words, the object is further achieved by the cooking appliance, which is designed with a holding device according to the invention, wherein the holding device is connected in a form-fitting and / or force-fitting manner to the cooking chamber wall and in a force-fitting manner to the functional element. In an assembled state, a system comprising the functional element and holding device seals the opening in the cooking chamber wall / the passage in a gas-tight manner. The functional element is thereby circumferentially contacted by the clamping section and preferably the contact section of the holding device, wherein a radially acting clamping force is exerted by the clamping section on the functional element.

[0038] In one aspect, the diameter of the contact portion may correspond to a diameter of the functional element.

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

[0040] Alternatively, it is conceivable that the first diameter of the contact section is slightly smaller than the diameter of the functional element. For example, a press fit can be formed between the contact section and the functional element.

[0041] Such a design of the contact section and the functional element can ensure that the functional element is guided in the holding device.

[0042] In a further aspect, if the holding device is fixed in the opening in the cooking chamber wall with a force-fitting and form-fitting connection, the clamping section of the holding device can be arranged in a cooking chamber of the cooking appliance. In other words, the holding device can be fixed in the opening in the cooking chamber wall in such a way that the clamping section, preferably formed with the locking edge, is arranged in the cooking chamber. The holding device can protrude a maximum of 10 mm, preferably a maximum of 5 mm, particularly preferably a maximum of 2 mm, into the cooking chamber. Such a small projection of the holding device or the functional element into the cooking chamber ensures a smooth appearance and makes it easier for a user to clean the cooking chamber.

[0043] In a further aspect, the clamping section of the holding device can be deformed / deformable by the functional element in such a way that the locking edge is spread radially in the cooking chamber by the functional element, effectively preventing removal of the holding device from the opening in the cooking chamber wall. In other words, by inserting the functional element into the holding device, the holding device can be further spread, particularly in the clamping section, and a clamping force between the functional element, the holding device, and the cooking chamber wall can be generated / increased. Thus, by inserting the functional element into the holding device, the holding device is elastically compressed and has a self-clamping effect.

[0044] This eliminates the need for an additional clamping element, yet still prevents accidental loosening of the connection during proper use. Furthermore, this design covers the cut edges of the opening in the cooking chamber wall, protecting the cooking chamber wall from corrosion at these particularly vulnerable points. Furthermore, the risk of injury to a user of the cooking appliance from sharp edges of the opening is minimized.

[0045] The object of the present invention is further achieved by a method for positioning and fixing a functional element, in particular a cylindrical section of the functional element, in particular a light guide in a passage of a wall, in particular a cooking chamber wall of a cooking appliance with a holding device, comprising the steps:

[0046] - Inserting the holding device into the passage in the cooking chamber wall so that the cooking chamber wall is received in a receiving section, preferably a groove, of the holding device;

[0047] - Inserting the functional element into a passage of the holding device; - Spreading a clamping section of the holding device by means of the functional element so that the holding device is pressed into the passage.

[0048] In other words, in the method according to the invention, the device is first inserted into the cooking chamber wall and then, by inserting the light guide into the through-opening of the device, the device is elastically deformed, thus achieving a gas-tight fixation of the light guide in the cooking chamber wall by the device.

[0049] Short description of the characters

[0050] Fig. 1 is a sectional view of a device according to the invention;

[0051] Fig. 2 is a representation of a cooking appliance according to the invention with the holding device and a light guide element in an unassembled state;

[0052] Fig. 3 is an enlarged sectional view of the cooking appliance according to the invention with the holding device and the light guide element in an assembled state;

[0053] Fig. 4 is a first illustration of an insertion process of the light guide element into the holding device; and

[0054] Fig. 5 is a second illustration of the insertion process of the light guide element into the holding device.

[0055] Description of the embodiments

[0056] Hereinafter, embodiments of the present disclosure will be described based on the accompanying figures.

[0057] Fig. 1 shows a holding device 2 according to the invention in a sectional view, wherein a sectional plane includes a longitudinal axis L of the holding device 2. The holding device 2 is formed in one piece and is rotationally symmetrical to the longitudinal axis L. The holding device 2 has a through-opening / passage 4 extending in a longitudinal direction of the longitudinal axis L. The through-opening 4 is designed to accommodate a light guide (see 38 Fig. 2). The holding device 2 includes an insertion section E formed in the through-opening 4, in which a cross-section of the through-opening 4 tapers conically, starting from an insertion opening 6. In other words, the insertion section E is funnel-shaped. On a side of the insertion section E facing away from the insertion opening 6, the through-opening 4 is formed with the contact section K1.

[0058] The through-opening 4 in the contact section K1 has a constant first diameter D1. A first transition 8 from the insertion section E to the contact section K1 is designed as a radius. A clamping section K2 adjoins the contact section K1 on a side in the through-opening 4 facing away from the insertion section E. The through-opening 4 in the clamping section K2 has a constant second diameter D2. The second diameter D2 is smaller than the first diameter D1. A second transition 10, which is formed between the contact section K1 and the clamping section K2, is designed as a radius.

[0059] The holding device 2 further includes a receiving section in the form of a groove 12, which is formed in an outer surface 14 of the holding device 2. The groove 12 is formed in the longitudinal direction L essentially at the level of the contact section K1 and is intended and designed to positively receive an oven wall (e.g., ceiling 28 in Fig. 2). The groove 12 is formed completely circumferentially in / on the outer surface 14 of the holding device 2, wherein the groove 12 extends essentially perpendicular to the longitudinal axis L, starting from the outer surface 14. The groove 12 is delimited in the direction toward the insertion opening 6 by a contact surface 16, which is oriented essentially perpendicular to the longitudinal axis L. In the direction away from the insertion opening 6, the groove 12 is delimited by a locking edge 18.The holding device 2 further includes an insertion bevel 20, which is formed on the outer surface 14 at an end section of the holding device 2 facing away from the insertion opening 6 and facilitates installation of the holding device 2 in the oven wall (see cover 28 in Fig. 2).

[0060] Fig. 2 shows a cooking appliance according to the invention, here in the form of a steam cooking appliance 22, with an oven 24, which includes two opposite side walls 26, a ceiling 28, and a base 30. The oven 24 defines a cooking chamber 32. An interior passage 34 in the form of a circular opening is formed in the ceiling 28. The steam cooking appliance 22 further includes the holding device 2 and an illumination device 36, which are shown in an unassembled state in Fig. 2 for better illustration. The illumination device 36 includes a light guide 38 and a light source 40, preferably as at least one LED with a heat sink.The light guide 38 is connected to the light source 40 such that light emitted by the light source 40 enters a first end of the light guide 38, is guided through the light guide 38 and exits the light guide 38 through a second end of the light guide 38, wherein the second end of the light guide 38 is arranged in the cooking chamber 32 in the assembled state.

[0061] Of course, the interior passage 34 can alternatively or additionally also be formed in one or both of the side walls 26 and / or in the bottom 30 of the oven 24.

[0062] Fig. 3 shows an enlarged partial view of a section through the steam cooking appliance 22, wherein the lighting device 36 and the holding device 2 are in an assembled state. In the assembled state shown here, the light guide 38 is circumferentially contacted by the contact section K1. Furthermore, in the assembled state, the light guide 38 is radially circumferentially clamped by the clamping section K2. In other words, a clamping force acting radially on the light guide 38 is exerted by the clamping section K2. The ceiling 28 of the oven 24 is received in a form-fitting manner in the groove 12 of the holding device 2. The locking edge 18, which is elastically deformed radially outward by the light guide 38 via the clamping section K2, fixes the holding device 2 against unintentional detachment from the oven 24. In the assembled state, the through-opening 4 has the first diameter D1 in both the contact section K1 and the clamping section K2.In other words, the clamping section K2 is deformed by the light guide 38 such that the diameter of the through-opening 4 in the contact section K1 and the clamping section K2 is constant. The locking edge 18, which is arranged in the longitudinal direction L at the height of the clamping section K2, is thus deformed / spread outward radially. In the assembled state, the locking edge 18 is arranged entirely within the cooking chamber 32 of the steam cooking appliance 22, with the locking edge 18 protruding only a few millimeters into the cooking chamber 32.

[0063] An assembly / assembly process of the light guide 38 is described below with reference to Fig. 1 to Fig. 5.

[0064] In a first step, the holding device 2 is inserted into the interior passage 34, which is arranged in the ceiling 28 of the oven 24. For this purpose, the insertion bevel 20 is placed against the interior passage 34 by applying a force to the holding device 2 and the force is increased until the locking edge 18 is elastically deformed and the groove 12 receives the ceiling 28 of the oven 24. The holding device 2 is now positively connected to the oven 24. Subsequently, in a second step, the lighting device 36 is mounted. For this purpose, the light guide 38 is inserted through the insertion opening 6 into the insertion section E. Due to the conically tapered shape of the insertion section E, the light guide 38 is centered as it is inserted through the insertion section E in the direction of the longitudinal axis L of the holding device 2, so that the light guide 38 is completely centered, at the latest at a height of the first transition 8.The light guide 38 is then inserted into the contact section K1, which contacts and guides the light guide 38 circumferentially (see Fig. 4).

[0065] As soon as the light guide reaches the second transition 10, a fitter must apply a deformation force. The deformation force must be large enough that the circumferential locking edge 18 of the light guide 38 is pushed radially outward and elastically deformed in the process. The deformation is illustrated by the arrows, which represent a deformation direction 42 in Fig. 4. This further strengthens the positive connection between the holding device 2 and the ceiling 38 of the oven 24. The locking edge 18 is deformed radially outward, away from the longitudinal axis. At the same time, the elastic deformation of the clamping section K2 exerts the clamping force on the light guide 38, which ensures a force-fitting connection between the light guide 38 and the holding device 2. The contact section K1 and the clamping section K2 now both have the first diameter D1 (see Fig. 5).

[0066] Subsequently, it is impossible to remove the holding device 2 from the interior passage 34 without first removing the light guide 38 from the holding device 2. The holding device 2 seals the interior passage 34 in a gas-tight manner via the groove 12 and the locking edge 18. Furthermore, the light guide 38 forms a gas-tight seal against the holding device 2 in the area of ​​the contact section K1 and the clamping section K2.

[0067] In summary, the holding device 2 according to the invention can fix the light guide 38 in the ceiling 38 of the oven 24 and simultaneously seal the oven 24. List of reference symbols

[0068] 2 holding device

[0069] 4 passage opening

[0070] 6 insertion opening

[0071] 8 first transition

[0072] 10 second transition

[0073] 12 grooves

[0074] 14 Exterior surface

[0075] 16 contact surface

[0076] 18 locking edge

[0077] 20 insertion chamfer

[0078] 22 Steamer

[0079] 24 oven

[0080] 26 Side wall

[0081] 28 Ceiling

[0082] 30 floor

[0083] 32 cooking chamber

[0084] 34 Interior draft

[0085] 36 Lighting device

[0086] 38 light guides

[0087] 40 light sources / LED

[0088] 42 Deformation direction L Longitudinal axis E Insertion section

[0089] K1 contact section

[0090] K2 clamping section

[0091] D1 first diameter

[0092] D2 second diameter

Claims

A holding device (2) for positioning and fixing a functional element, in particular a cylindrical section of the functional element, preferably a light guide (38), in a passage (34) of a wall, in particular a cooking chamber wall (26, 28, 30) of a cooking appliance (22), comprising a base body, in particular a rotationally symmetrical one, which can be axially inserted into the passage (34) and penetrates it, wherein the base body comprises: a central passage (4) extending in the axial direction (L) of the base body, into which the functional element can be inserted; and a radially outwardly arranged receiving section (12) which, in the inserted state, receives an inner edge of the passage (34); characterized in that the passage (4) has a clamping section (K2) whose diameter (D2) is smaller than the diameter (D1) of the functional element and is dimensioned such thatthat when inserting the functional element into the passage (34), the clamping section (K2) can be elastically expanded radially outward, and the applied radial clamping force fixes the functional element and the base body to the passage (34) in a fluid-tight and / or gas-tight and self-clamping manner. Holding device (2) according to claim 1, characterized in that the receiving section (12) is delimited in at least one axial direction, preferably in the insertion direction, by a preferably circumferential projection section (18), and the clamping section (K2) is provided radially within the projection section (18), so that when the clamping section (K2) is expanded by the functional element, the projection section (18) can also be elastically expanded radially outward and enters into an axial positive connection with the passage (34), which can only be released by removing the functional element. Holding device (2) according to claim 2, characterized inthat the projection section (18) is formed by a circumferential locking edge, the outer diameter of which is larger than the inner diameter of the passage and which is dimensioned such that when the base body is inserted into the passage without a functional element, the locking edge elastically deflects radially inwards and then locks positively onto the passage. Holding device (2) according to one of claims 1 to 3, characterized in that the passage has a contact section (K1) that is provided radially inside the receiving section (12) and has a diameter (D1) that substantially corresponds to the diameter of the cylindrical section of the functional element. Holding device (2) according to claim 4, characterized in that the passage (4) is provided with a radius and / or a chamfer in a region of the clamping section (K2) that adjoins the contact section (K1).Holding device (2) according to one of claims 1 to 5, characterized in that the receiving section (12) is delimited in a direction opposite to the insertion direction of the base body by a preferably circumferential stop (16), and the receiving section (12) is designed as a groove between the projection section (18) and the stop (16), wherein the groove width preferably corresponds to the length of the passage (34) or the thickness of the wall. Holding device (2) according to one of claims 1 to 6, characterized in that the base body has an insertion bevel (20) on the outer side lying in the insertion direction; and / or the passage (4) has a preferably conically tapered insertion section (E) on the side opposite the insertion direction. Holding device (2) according to one of claims 1 to 7, characterized in that the holding device (2) is formed integrally from a thermostable elastomer.Cooking appliance (22), preferably a steam cooking appliance, with a holding device (2) according to one of claims 1 to 8 and a functional element, in particular a light guide (38), wherein the functional element is fixed in a force-fitting manner in the clamping section (K2) of the holding device (2) and the holding device (2) is fixed in a force-fitting manner and preferably in a form-fitting manner in a passage (34) of a cooking chamber wall (26, 28, 30), in particular in an upper side (28), of the cooking appliance (22). Method for positioning and fixing a functional element, in particular a cylindrical section of the functional element, in particular a light guide (38) in a passage (34) of a wall, in particular a cooking chamber wall (26, 28, 30) of a cooking appliance (22) with a holding device (2), comprising the steps: - inserting the holding device (2) into the passage (34) in the cooking chamber wall (26, 28, 30) so that the cooking chamber wall (26, 28, 30) is received in a receiving section (12), preferably a groove, of the holding device (2); - inserting the functional element into a passage (4) of the holding device (2); - spreading a clamping section (K2) of the holding device (2) by means of the functional element, so that a fluid-tight and / or gas-tight pressing of the holding device (2) in the passage (34) takes place.

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