COOKING APPLIANCE WITH SELF-CLEANING FUNCTION, PREFERABLY WITH STEAM FUNCTION, PARTICULARLY PREFERABLY AN OVEN/STEAM COOKER COMBINATION APPLIANCE

Abstract

A cooking appliance with a self-cleaning function includes: a cooking chamber partially formed by an inner enclosure; a cleaning device for cleaning the cooking chamber, the cleaning device including a delivery device and a distribution device; a closure element for closing and clearing an access opening of the cooking chamber; and at least one cooking chamber seal disposed in a cooking chamber groove of the cooking appliance such that the at least one cooking chamber seal faces the closure element, the cooking chamber groove being formed by the inner enclosure and/or by a front housing wall of the cooking appliance. The cooking chamber seal, at least in some sections, has at least one slot extending along a principal direction of extent thereof, the at least one slot being open inwardly in a mounting direction and/or outwardly in a direction opposite the mounting direction.

Claims

1. A cooking appliance with a self-cleaning function, comprising: a cooking chamber partially formed by an inner enclosure; a cleaning device for cleaning the cooking chamber, the cleaning device including a delivery device and a distribution device; a closure element configured to close and clear an access opening of the cooking chamber; and at least one cooking chamber seal disposed in a cooking chamber groove of the cooking appliance such that the at least one cooking chamber seal faces the closure element, the cooking chamber groove being formed by the inner enclosure and/or by a front housing wall of the cooking appliance, wherein the cooking chamber seal, at least in some sections, has at least one slot extending along a principal direction of extent thereof, the at least one slot being open inwardly in a mounting direction and/or outwardly in a direction opposite the mounting direction.

2. The cooking appliance of claim 1, wherein the at least one slot is open outwardly in a direction opposite the mounting direction, and wherein the at least one slot is filled, at least in some sections, by a clamping element such that the cooking chamber seal is pressed against sides of the cooking chamber groove perpendicularly to the mounting direction.

3. The cooking appliance of claim 2, wherein the at least one slot is formed only along a lower edge of the inner enclosure, and wherein the clamping element is disposed exactly along the lower edge of the inner enclosure.

4. The cooking appliance of claim 2, wherein the at least one slot has a constriction perpendicular to the mounting direction, wherein the clamping element has a clamping edge and a neck that is thinner than the clamping edge perpendicularly to the mounting direction, and wherein the constriction of the at least one slot positively holds the clamping element by the clamping edge.

5. The cooking appliance of claim 2, wherein the at least one slot of the cooking chamber seal has, at least on one side, a recess formed in the mounting direction and facing the closure element, and wherein the clamping element has, at least on one side, an outer edge facing the closure element, the outer edge(s) being partially or completely received, in the mounting direction, by the recess of the cooking chamber seal.

6. The cooking appliance of claim 5, wherein a front face of the clamping element facing the closure element is set back in relation to the cooking chamber seal.

7. The cooking appliance of claim 5, wherein the cooking chamber seal and a front face of the clamping element facing the closure element together form a smooth surface.

8. The cooking appliance of claim 1, wherein the at least one slot is open inwardly in the mounting direction, and wherein the at least one slot is continuous along a principal direction of extent of the cooking chamber seal.

9. The cooking appliance of claim 1, wherein the cooking chamber seal has a flush surface opposite the at least one slot.

10. The cooking appliance of claim 1, wherein the cooking chamber seal has a sealing lip for a front housing wall, which sealing lip engages the front housing wall in the mounting direction.

11. The cooking appliance of claim 1, wherein the cooking chamber seal has a corrugated contact surface which engages a front housing wall perpendicularly to the mounting direction.

12. The cooking appliance of claim 1, wherein the cooking chamber seal has a sealing lip for the closure element, which sealing lip is configured to engage an inside of the closure element in a direction opposite the mounting direction.

13. The cooking appliance of claim 1, wherein the cooking chamber seal has a sealing lip for an inner cooking chamber side of the cooking chamber, which sealing lip engages an inner cooking chamber side of the cooking chamber perpendicularly to the mounting direction.

14. The cooking appliance of claim 1, wherein the cooking chamber seal is formed as a single piece and/or comprises an elastic material.

15. A cooking chamber seal for the cooking appliance of claim 1.

16. The cooking appliance of claim 1, wherein the self-cleaning function comprises a steam function.

17. The cooking appliance of claim 1, wherein the cooking appliance comprises an oven/steam cooker combination appliance.

18. The cooking appliance of claim 5, wherein the at least one slot of the cooking chamber seal has, on both sides, the recess formed in the mounting direction and facing the closure element, and wherein the clamping element has, on both sides, the outer edge facing the closure element.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Subject matter of the present disclosure will be described in even greater detail below based on the exemplary figures. All features described and/or illustrated herein can be used alone or combined in different combinations. The features and advantages of various embodiments will become apparent by reading the following detailed description with reference to the attached drawings, which illustrate the following:

[0024] FIG. 1 is a schematic perspective view of an inventive cooking appliance in the form of an oven/steam cooker combination appliance having a cooking chamber groove, viewed obliquely from above and shown without an inserted cooking chamber seal;

[0025] FIG. 2 is a detail view of the bottom right portion of FIG. 1;

[0026] FIG. 3 is a cross-sectional view of an inventive cooking chamber seal according to a first exemplary embodiment;

[0027] FIG. 4 is a cross-sectional view showing the inventive cooking chamber seal according to the first exemplary embodiment in the cooking chamber groove;

[0028] FIG. 5 is a schematic perspective view of an inventive cooking chamber seal according to a second exemplary embodiment;

[0029] FIG. 6 is a schematic perspective view of a clamping element for the inventive cooking chamber seal according to the second exemplary embodiment;

[0030] FIG. 7 is a cross-sectional view of the inventive cooking chamber seal according to the first exemplary embodiment; and

[0031] FIG. 8 is a cross-sectional view showing the inventive cooking chamber seal according to the second exemplary embodiment in the cooking chamber groove with the clamping element inserted.

DETAILED DESCRIPTION

[0032] In an embodiment, the present invention provides a cooking appliance with self-cleaning function that is capable of ensuring fluid tightness of the access opening of the cooking chamber. This may be achieved especially when liquids are used, in particular cleaning liquids with reduced surface tension. This may be achieved in particular in the area of the lower edge of the access opening of the cooking chamber. In any case, this may be achievable in a most simple, cost-effective and space-saving manner that allows easy mounting and is visually appealing and unobtrusive to the user. An embodiment at least provide an alternative to the known approaches.

[0033] Thus, in an embodiment, the present invention provides a cooking appliance with self-cleaning function, preferably with steam function, particularly preferably an oven/steam cooker combination appliance, having a cooking chamber partially formed by an inner enclosure, further having a cleaning device for cleaning the cooking chamber, the cleaning device including a delivery device and a distribution device, and further having a closure element configured and adapted for closing and clearing an access opening of the cooking chamber, at least one cooking chamber seal being disposed in a cooking chamber groove such that it faces the closure element, the cooking chamber groove being formed by the inner enclosure and/or by a front housing wall. The cleaning device may be implemented as described at the outset or as known in the art. In particular, the closure element may be a door or a flap. The cooking chamber seal is disposed on the cooking appliance in a manner that makes it possible to obtain the sealing action between the closure element in the closed state and the remainder of the cooking appliance, in particular the inner enclosure and/or the front housing wall.

[0034] The inventive cooking appliance with self-cleaning function is wherein the cooking chamber seal, at least in some sections, has at least one slot extending along the principal direction of extent thereof, the slot being open inwardly in the mounting direction or outwardly in a direction opposite to the mounting direction. The mounting direction or the direction opposite thereto points in the direction in which the closure element closes the access opening of the cooking chamber when in the closed state. This may in particular be the longitudinal direction or depth of the cooking appliance. The principal direction of extent of the cooking chamber seal, which is preferably continuously closed, is the path of the edge of the access opening of the cooking chamber. The cooking chamber seal may be composed of a plurality of individual elements which are joined together to form the cooking chamber seal. To simplify mounting, it may be preferable for the cooking chamber seal to be formed as a continuous, single piece. The slot may also be referred to as notch or groove. The slot may be formed by suitable shaping directly during the manufacture of the cooking chamber seal or may also be formed into the cooking chamber seal by material removal at a later time.

[0035] In any case, the inventive cooking chamber seal of the inventive cooking appliance has a slot that extends from outside into the material or body of the cooking chamber seal in or opposite to the mounting direction, such as in particular the longitudinal direction. This results in a weakening of the material in a direction perpendicular to the mounting direction and perpendicular to the principal direction of extent of the cooking chamber seal, which allows the cooking chamber seal to be compressed to a greater extent perpendicularly to the mounting direction and perpendicularly to the principal direction of extent during mounting, which can facilitate the mounting process. This makes it possible to effect a positive and/or frictional retention of the cooking chamber seal in the cooking chamber groove, which can improve retention in the mounted state. Also, compression of the cooking chamber seal during mounting or insertion into the cooking chamber groove makes it possible to compensate for tolerances.

[0036] In any case, the slot allows the cooking chamber seal to be compressed to a greater extent than was previously known perpendicularly to the mounting direction and perpendicularly to the principal direction of extent, which can produce the effects and advantages previously described.

[0037] In accordance with an aspect of the invention, the slot is open outwardly in a direction opposite to the mounting direction, and the outwardly open slot is filled, at least in some sections, by a clamping element such that the cooking chamber seal is pressed against the sides of the cooking chamber groove perpendicularly to the mounting direction. This may be one option for practical implementation. In particular, this makes it possible to achieve the sealing action of the cooking chamber seal perpendicular to the mounting direction and perpendicular to the principal direction of extent. This may be accomplished by means of the additional clamping element after the cooking chamber seal itself has been mounted, so that the mounting of the cooking chamber seal itself is not changed and thus not complicated.

[0038] Thus, as known in the art, the cooking chamber seal can first be mounted in the cooking chamber groove and then be spread apart perpendicularly to the mounting direction and perpendicularly to the principal direction of extent by additionally inserting the clamping element, which can improve the sealing effect without changing or complicating the mounting of the cooking chamber seal itself.

[0039] In accordance with another aspect of the invention, the outwardly open slot is formed only along a lower edge of the inner enclosure, and the clamping element is disposed exactly along the lower edge of the inner enclosure. Thus, the previously described effect can be achieved exactly in the lower area between the cooking chamber and the closure element, where the liquids may accumulate. The liquids may get into this area especially when they flow down the inside of the closure element. Since this is exactly where increased fluid tightness requirements must be met, improved tightness can be achieved as previously described exactly where it is needed or where it can have a beneficial effect. Other than that, improved tightness can therefore be dispensed with and the additional effort associated therewith can be avoided.

[0040] In accordance with a further aspect of the invention, the outwardly open slot has a constriction perpendicular to the mounting direction, the clamping element having a clamping edge and a neck that is thinner than the clamping edge perpendicularly to the mounting direction, and the constriction of the outwardly open slot positively holding the clamping element by means of the clamping edge. Depending on the design, an additional, frictional retention may be achieved. In any case, the clamping element can be held by the cooking chamber seal in this way without further measures, which can minimize the effort required for implementation and mounting. In particular, this also makes it possible to achieve a secure retention, which prevents the clamping element from being inadvertently removed from the cooking chamber seal by the user when cleaning the outer surface of the cooking chamber seal.

[0041] In accordance with another aspect of the invention, the outwardly open slot of the cooking chamber seal has, at least on one side, preferably on both sides, a recess formed in the mounting direction and facing the closure element, and the clamping element has, at least on one side, preferably on both sides, an outer edge facing the closure element, the outer edge(s) being partially or completely received, in the mounting direction, by the corresponding recess of the cooking chamber seal. In other words, the clamping element can be received within the contour of the cooking chamber seal or its recess as a clamping element receptacle in order for it not to protrude toward the closure element, which could impair the sealing effect of the cooking chamber seal and/or could be perceived by the user as visually disturbing.

[0042] In accordance with a further aspect of the invention, a front face of the clamping element facing the closure element is set back in relation to the cooking chamber seal. This allows the clamping element to be prevented from protruding toward the closure element also in the context of manufacturing and mounting tolerances.

[0043] In accordance with another aspect of the invention, the cooking chamber seal and a front face of the clamping element facing the closure element together form a smooth surface. This makes it possible to obtain a smooth boundary surface toward the closure element, which may be perceived by the user as visually particularly appealing.

[0044] In accordance with a further aspect of the invention, the slot is open inwardly in the mounting direction, and the inwardly open slot is continuous along the principal direction of extent of the cooking chamber seal. This can be an alternative option for practical implementation. This can also simplify the implementation, because the slot can be formed into the material of the cooking chamber seal from inside when viewed in the mounted state, which makes it possible to minimize the depth of the slot. This also makes it possible to configure the cooking chamber seal to have a closed, flat or smooth shape toward the closure element, which can improve the visual appearance to the user.

[0045] In accordance with another aspect of the invention, the cooking chamber seal has a flush surface opposite the inwardly open slot. This may be perceived by the user as visually appealing. This can also promote the sealing effect against the closure element.

[0046] In accordance with a further aspect of the invention, the cooking chamber seal has a sealing lip for the front housing wall, which sealing lip engages the front housing wall in the mounting direction. This can improve the sealing effect at this location.

[0047] In accordance with another aspect of the invention, the cooking chamber seal has a corrugated contact surface which engages the front housing wall perpendicularly to the mounting direction. This may provide a linear point contact surface that is as uniform as possible, in particular a circumferentially linear contact surface, which improves the sealing effect. When viewing the sealing lip in cross section, a linear contact surface is a point contact between the sealing lip and the housing wall. In particular, the linear contact surface is oriented perpendicular to the mounting direction and perpendicular to the principal direction of extent.

[0048] In accordance with a further aspect of the invention, the cooking chamber seal has a sealing lip for the closure element, which sealing lip is configured to engage the inside of the closure element in a direction opposite to the mounting direction. This can improve the sealing effect at this location.

[0049] In accordance with another aspect of the invention, the cooking chamber seal has a sealing lip for an inner cooking chamber side of the cooking chamber, which sealing lip engages the inner cooking chamber side of the cooking chamber perpendicularly to the mounting direction. This can improve the sealing effect at this location.

[0050] In accordance with a further aspect of the invention, the cooking chamber seal is formed as a single piece and/or made of an elastic material. The unitary (i.e., integral) configuration of the cooking chamber seal as a single piece can simplify the manufacture and mounting. The use of an elastic material, such as, in particular, an elastomeric material, can ensure or improve the sealing effect.

[0051] The present invention also relates to a cooking chamber seal for use in a cooking appliance as previously described. Thus, a cooking chamber seal as previously described can be provided to enable implementation of a cooking appliance with self-cleaning function as previously described and to be able to make use of its features and advantages.

[0052] The present invention further relates to a clamping element for use in a cooking chamber seal as previously described. Thus, a clamping element as previously described can be provided to enable implementation of a cooking chamber seal as previously described and to be able to make use of its features and advantages.

[0053] In other words, first the cooking chamber seal is mounted in the mounting groove. Then, a clamping piece is inserted into the cooking chamber seal, which clamping piece thickens the seal in the required sealing area, providing the necessary overlap and thus ensuring tightness. Thus, the tightness into the appliance is also guaranteed during the cleaning process. At the same time, it is ensured that the mounting process of the cooking chamber seal does not become complicated, since there is no need to insert any additional material overhang into the mounting gap.

[0054] The sealing function is improved without impairing or preventing the mounting of the seal. No additional tool is needed for mounting.

[0055] The above figures are viewed in Cartesian coordinates. A longitudinal direction X can also be referred to as depth X or length X. Perpendicular to longitudinal direction X is a transverse direction Y, which can also be referred to as width Y. A vertical direction Z, which can also be referred to as height Z and corresponds to the direction of gravity, is perpendicular to both the longitudinal direction X and the transverse direction Y. Longitudinal direction X and transverse direction Y together define the horizontal X, Y, which can also be referred to as horizontal plane X, Y.

[0056] A cooking appliance 1 with self-cleaning function according to the invention will be discussed as a cooking appliance 1 with self-cleaning function and with steam function using the example of an oven/steam cooker combination appliance 1 with self-cleaning function.

[0057] Oven/steam cooker combination appliance 1 has a cooking chamber 10 as an interior space 10, which is defined by an inner enclosure 11 as an inner housing 11. The side of inner enclosure 11 facing interior space 10 can be referred to as inner cooking chamber side 11a, and the side of inner enclosure 11 facing away from interior space 10 can be referred to as outer cooking chamber side 11b. Cooking chamber 10 is accessible to the user from the front in longitudinal direction X through an access opening 14, which can be opened and closed by a closure element (see, for example, FIG. 1).

[0058] Inner enclosure 11 is adjoined in transverse direction Y and in vertical direction Z by a front housing wall 13, which bounds or closes an interstitial space (not labeled) in longitudinal direction X toward the front. Between the edge of inner enclosure 11 and front housing wall 13, a cooking chamber groove 12 is formed as an indentation in longitudinal direction X into the cooking appliance, the cooking chamber groove 12 extending parallel to cooking chamber 10 (see, for example, FIG. 2).

[0059] According to the first exemplary embodiment, in order to provide for fluid-tight sealing of cooking chamber 10 with respect to access opening 14 when the closure element is in the closed state, a cooking chamber seal 2 is used which is formed in one piece from an elastic material, in particular from an elastomeric material. Cooking chamber seal 2 has a preferred direction of extent, in which cooking chamber seal 2 is continuously closed. The cross-sectional profile of the cooking chamber seal 2 according to the first exemplary embodiment can be seen, for example, in FIG. 3. Cooking chamber seal 2 has a rectangular shape with rounded corners that corresponds to the shape of cooking chamber groove 12 of oven/steam cooker combination appliance 1 (compare FIG. 5 of the second exemplary embodiment). Cooking chamber seal 2 is fitted into cooking chamber groove 12 of oven/steam cooker combination appliance 1 in a mounting direction A which corresponds to longitudinal direction X and points away from the user.

[0060] The cooking chamber seal 2 according to the first exemplary embodiment has a housing attachment receptacle 20 in the form of an indentation by which cooking chamber seal 2 is positively held around an edge of inner enclosure 11 (see, for example, FIGS. 3 and 4).

[0061] The cooking chamber seal 2 according to the first exemplary embodiment has a corrugated contact surface 24, which engages front housing wall 13 perpendicularly to mounting direction A (see, for example, FIGS. 3 and 4). In this way, a substantially uniform point contact surface can be provided at this location.

[0062] The cooking chamber seal 2 according to the first exemplary embodiment has a sealing lip 21 for front housing wall 13, which sealing lip 21 engages front housing wall 13 in mounting direction A (see, for example, FIGS. 3 and 4). In this way, fluid-tightness can be achieved at this location.

[0063] The cooking chamber seal 2 according to the first exemplary embodiment has a sealing lip 22 for the closure element, which sealing lip 22 is configured to engage the inside of the closure element in a direction opposite to mounting direction A (see, for example, FIGS. 3 and 4). In this way, fluid-tightness can be achieved at this location.

[0064] The cooking chamber seal 2 according to the first exemplary embodiment has a sealing lip 23 for inner cooking chamber side 11a of cooking chamber 11, which sealing lip 23 engages inner cooking chamber side 11a of cooking chamber 11 perpendicularly to mounting direction A (see, for example, FIGS. 3 and 4). In this way, fluid-tightness can be achieved at this location.

[0065] The cooking chamber seal 2 according to the first exemplary embodiment has a slot 25 which is open inwardly in mounting direction A; i.e., points inwardly into cooking chamber groove 12 (see, for example, FIGS. 3 and 4), and thus increases the elasticity of this portion of cooking chamber seal 2 perpendicularly to mounting direction A and perpendicularly to the principal direction of extent of cooking chamber seal 2. This can simplify mounting and make it possible to compensate for tolerances. The inwardly open slot 25, which can also be referred to as notch 25, is formed continuously along the principal direction of extent of cooking chamber seal 2. Cooking chamber seal 2 has a flush surface opposite the inwardly open slot 25 in order to obtain a smooth boundary surface toward the closed closure element.

[0066] The cooking chamber seal 2 according to the second exemplary embodiment of FIGS. 5 to 8 is used in combination with a single-piece clamping element 3 or clamping piece 3. The cooking chamber seal 2 according to the second exemplary embodiment is substantially similar to the cooking chamber seal 2 according to the first exemplary embodiment with the difference that instead of the surrounding, inwardly open slot 25, a slot 26 which is open outwardly in a direction opposite to mounting direction A is provided only in the area of the lower edge of cooking chamber 10; i.e., an outwardly open slot 26 in the form of a clamping element receptacle 26. Clamping element receptacle 26 of cooking chamber seal 2 merges into a constriction 26a along longitudinal direction X. A recess 26b is formed both above and below constriction 26a in vertical direction Z (see, for example FIG. 7).

[0067] Clamping element 3 has a clamping edge 32 which is ball head-shaped in cross section and is received by clamping element receptacle 26 of cooking chamber seal 2 when in the mounted state. Clamping element 3 merges from the clamping edge 32 into a neck 31, which is received by constriction 26a of cooking chamber seal 2 when in the mounted state. An outer edge 31 is formed both above and below neck 31 in vertical direction Z (see, for example FIG. 6), the outer edges 31 filling the recesses 26b of cooking chamber seal 26 in the mounted state, so that a front face 30 of clamping element 3 is flush with cooking chamber seal 2 toward the closed closure element (see, for example FIG. 8).

[0068] During mounting of the cooking chamber seal 2 according to the second exemplary embodiment, as in the first exemplary embodiment, cooking chamber seal 2 is inserted by hand into cooking chamber groove 12 and thereby resiliently pressed into cooking chamber groove 12 of oven/steam cooker combination appliance 1 in such a manner that cooking chamber seal 2 is positively held around the respective edge of inner enclosure 11 by means of cooking appliance housing receptacle 20. In both cases, this can be facilitated by the inwardly open slot 25 of the first exemplary embodiment or by the outwardly open slot 26b of the second exemplary embodiment, respectively.

[0069] In the case of the first exemplary embodiment, the mounting of cooking chamber seal 2 is thus complete.

[0070] In the case of the second exemplary embodiment, clamping element 3 is then pressed in mounting direction A, with clamping edge 32 first, into outwardly open slot 26 as a clamping element receptacle 26, whereby the tightness is increased, in particular in the area of cooking appliance housing receptacle 20 and the corresponding edge of the inner enclosure 11. Clamping element 3 is positively held by cooking chamber seal 2 by means of constriction 26a of cooking chamber seal 2.

[0071] While the invention has been illustrated and described in detail in the drawings and foregoing description, such illustration and description are to be considered illustrative or exemplary and not restrictive. It will be understood that changes and modifications may be made by those of ordinary skill within the scope of the following claims. In particular, the present invention covers further embodiments with any combination of features from different embodiments described above and below. Additionally, statements made herein characterizing the invention refer to an embodiment of the invention and not necessarily all embodiments.

[0072] The terms used in the claims should be construed to have the broadest reasonable interpretation consistent with the foregoing description. For example, the use of the article a or the in introducing an element should not be interpreted as being exclusive of a plurality of elements. Likewise, the recitation of or should be interpreted as being inclusive, such that the recitation of A or B is not exclusive of A and B, unless it is clear from the context or the foregoing description that only one of A and B is intended. Further, the recitation of at least one of A, B and C should be interpreted as one or more of a group of elements consisting of A, B and C, and should not be interpreted as requiring at least one of each of the listed elements A, B and C, regardless of whether A, B and C are related as categories or otherwise. Moreover, the recitation of A, B and/or C or at least one of A, B or C should be interpreted as including any singular entity from the listed elements, e.g., A, any subset from the listed elements, e.g., A and B, or the entire list of elements A, B and C.

LIST OF REFERENCE CHARACTERS (PART OF THE DESCRIPTION)

[0073] A mounting direction [0074] X longitudinal direction; depth; length [0075] Y transverse direction; width [0076] Z vertical direction; height [0077] X, Y horizontal; horizontal plane [0078] 1 cooking appliance with self-cleaning function (with steam function); oven/steam cooker combination appliance [0079] 10 cooking chamber; interior space [0080] 11 inner enclosure; inner housing [0081] 11a inner cooking chamber side [0082] 11b outer cooking chamber side [0083] 12 cooking chamber groove [0084] 13 front housing wall [0085] 14 access opening [0086] 2 cooking chamber seal [0087] 20 housing attachment receptacle [0088] 21 sealing lip for front housing wall 13 [0089] 22 sealing lip for the closure element [0090] 23 sealing lip for inner cooking chamber side 11a [0091] 24 corrugated contact surface for front housing wall 13 [0092] 25 inwardly open slot; notch [0093] 26 outwardly open slot; clamping element receptacle [0094] 26a constriction [0095] 26b recesses of clamping element receptacle 26 [0096] 3 clamping element; clamping piece [0097] 30 front face [0098] 31 outer edges [0099] 32 clamping edge [0100] 33 neck