阅读说明：本技术 用于紧固到板状元件的紧固装置 (Fastening device for fastening to a plate-shaped element ) 是由 克里斯蒂安·谢勒 马蒂亚斯·沃尔夫 于 2020-01-08 设计创作，主要内容包括：一种用于紧固到板状元件的紧固装置(100)具有头部(110)和脚部(120)。所述脚部(120)具有：芯部(121),所述芯部沿着旋转轴线从所述头部(110)延伸；以及至少一组叶片(122),所述叶片至少在区域中是弹性的并且从所述芯部(121)向外延伸。所述叶片(122)中的每个叶片具有倾斜肩台(123)或具有精细台阶状渐变部的肩台,所述倾斜肩台或具有精细台阶状渐变部的肩台被形成在对应的叶片(122)的外边缘上,所述外边缘朝向所述头部(110)布置。所述倾斜肩台(123)或所述肩台的所述渐变部的各个台阶相对于具有所述芯部的所述旋转轴线作为垂线的平面以斜率倾斜。所述叶片的所述肩台(123)沿着所述旋转轴线被布置处于彼此不同的高度。(A fastening device (100) for fastening to a plate-like element has a head (110) and a foot (120). The foot section (120) has: a core (121) extending from the head (110) along an axis of rotation; and at least one set of blades (122) which are elastic at least in regions and which extend outwards from the core (121). Each of the blades (122) has an inclined shoulder (123) or a shoulder with a fine step progression formed on an outer edge of the corresponding blade (122) arranged towards the head (110). The inclined shoulder (123) or each step of the gradually changing portion of the shoulder is inclined at a slope with respect to a plane having the rotation axis of the core as a perpendicular line. The shoulders (123) of the blades are arranged at mutually different heights along the axis of rotation.)

1. A fastening device (100) for fastening to a plate-like element, wherein the fastening device (100) has a head (110) and a foot (120), wherein the foot (120) has the following components:

-a core (121) extending from the head (110) along an axis of rotation; and

-at least one set of blades (122) which are elastic at least in areas and extend outwards from the core (121),

wherein each of the blades (122) has an inclined shoulder (123) or a shoulder with a particularly fine step progression formed on an outer edge of the corresponding blade (122) which is arranged towards the head (110),

wherein each step of the inclined shoulder (123) or the gradually changing portion of the shoulder is inclined at a slope with respect to a plane having the rotation axis of the core (121) as a perpendicular line,

wherein the shoulders (123) of the blades (122) are arranged at mutually different heights along the axis of rotation of the core (121).

2. The fastening device (100) of claim 1,

wherein the blades (122) of the at least one set of blades (122), which are elastic at least in the region, are preferably arranged close to each other or adjacent to each other in a manner classified according to the height of their sloping shoulders (123).

3. The fastening device (100) of claim 1 or 2,

wherein the point of the sloping shoulder (123) of a blade (122) which is furthest away from the head (110) is further away from the head (110) than the point of the sloping shoulder (123) of an adjacent blade (122) which is arranged closest to the head (110), the sloping shoulder (123) of the adjacent blade being generally further away from the head (110).

4. The fastening device (100) according to one of the preceding claims,

wherein two or more groups, in particular three groups, of blades (122) are formed which are elastic at least in regions, said blades preferably having the same or at least substantially the same design, and

wherein the blades (122) are preferably arranged evenly distributed along the circumference of the core (121).

5. The fastening device (100) according to one of the preceding claims,

wherein each blade (122) has a connection region (124) connecting the respective inclined shoulder (123) to the core (121).

6. The fastening device (100) of claim 5,

wherein corresponding connection regions (124) of at least one of the blades (122), preferably a plurality of the blades (122), particularly preferably all the blades (122) adjacent to a corresponding shoulder (123), form stop regions (125) which are formed at least substantially orthogonally with respect to the plane with the axis of rotation of the core (122) as a perpendicular.

7. The fastening device (100) of claim 5 or 6,

wherein the connection region (124) on the side facing the head (110) has at least substantially no slope with respect to the plane with the axis of rotation of the core (121) as a perpendicular.

8. The fastening device (100) of claim 5 or 6,

wherein the connection region (124) on the side facing the head (110) has a slope or a bevel profile with respect to the plane with the axis of rotation of the core (121) as a perpendicular.

9. The fastening device (100) according to one of claims 5 to 8,

wherein the connection regions (124) are formed at the same height or at least substantially the same height along the rotational axis of the core (121).

10. The fastening device (100) according to one of claims 5 to 8,

wherein the connection regions (124) are formed at different heights from each other along the rotational axis of the core (121).

11. The fastening device (100) according to one of the preceding claims,

wherein an outer region (126) of the oblique shoulders (123) of at least one of the blades (122), preferably of a plurality of the blades (122), particularly preferably of all the blades (122), has no slope with respect to the plane with the axis of rotation of the core (121) as a perpendicular.

12. The fastening device (100) according to one of the preceding claims,

wherein the head (110) has a plate-shaped base region (111) and an annular region (120) which surrounds the plate-shaped base region and projects in the direction of the foot (112).

13. The fastening device (100) according to one of the preceding claims,

wherein the fastening device (100) furthermore has a sealing material (130) which is arranged in a surrounding manner on the surface of the head (110) which is directed in the direction of the foot (120), wherein the sealing material (130) preferably has a hot-melt adhesive, in particular in an expandable form.

14. The fastening device (100) according to claims 12 and 13,

wherein the annular region (112) laterally covers the sealing material (130) at least in regions, preferably completely.

15. A method for producing a fastening device according to at least claim 12 and claim 13, wherein the method has the following steps:

-injection moulding the head (110) and the foot (120) of the fastening device (100), wherein the annular region (112) of the head (110) is directed in the opposite direction to the foot (120);

-inserting an intermediate product consisting of the injection-molded head (110) and foot (120) into a mold;

-closing the mould, wherein the annular region (112) of the head (110) is pressed downwards in the direction of the foot (120) during the closing of the mould or the annular region (112) of the head (110) is pressed downwards in the direction of the foot (120) by means of a manipulator, in particular a robot, in particular in each case in such a way that the annular region (112) protrudes from the plate-shaped base region (111) in the direction of the foot (120) at least after the closing of the mould; and

-injecting the sealing material (130) on a surface of the head (110) directed in the direction of the foot (120).

Technical Field

The invention relates to a fastening device for fastening itself or an element to a preferably at least substantially plate-shaped element, in particular a body panel of a vehicle. The invention further relates to a method for producing such a fastening device.

Background

Fastening devices of the above-mentioned type are known from the prior art, wherein the fastening devices conventionally have a head and a foot region. The foot area is pressed through a hole in the plate-like element and serves to hold the fastening device in the plate-like element.

This type of foot region conventionally has a core from which a plurality of identically designed resilient blades extend outwardly. When the fastening means are inserted into the plate-like element, the blades may be elastically deformed in the direction of the core, so that they permit the retention or engagement of the foot in the hole.

However, the fastening devices known from the prior art have the disadvantage that they require high mounting forces, cannot be used satisfactorily in the case of plate-shaped elements having different thicknesses or thickness tolerances and use complicated, less than perfect production methods.

Disclosure of Invention

The present invention is therefore based on the object of specifying a fastening device for fastening to a plate-like element, which eliminates the above-mentioned problems and disadvantages of the prior art. In particular, the object of the invention is to specify a fastening device which requires only low mounting forces and which can be used in the case of plate-shaped elements having different thicknesses. Furthermore, it is an object of the invention to specify a method for producing a fastening device which permits simple production of the fastening device.

The solution according to the invention consists in designing a fastening device for fastening to a plate-shaped element, wherein the fastening device has a head and a foot, wherein the foot has the following components: a core extending from the head along the axis of rotation; and at least one set of blades which are elastic at least in regions and which extend outwards from the core, wherein each of the blades has an inclined shoulder or a shoulder with a particularly fine step progression which is formed on an outer edge of the respective blade, which outer edge is arranged towards the head, wherein the steps of the inclined shoulder or progression are inclined with a slope with respect to a plane having the axis of rotation of the core as a perpendicular, wherein the shoulders of the blades are arranged at mutually different heights along the axis of rotation of the core.

This object is achieved in a satisfactory manner by a fastening device according to the invention.

The blade is here elastic in such a way that the outer edge of the blade can be bent in the direction of the core when mounted. The shoulders of the blade are in each case located on the side of the blade arranged towards the head, i.e. on the upper side of the blade.

The described plane with the axis of rotation of the core as a perpendicular is a horizontal plane, which is also arranged, for example, parallel to the main direction of extension of the head.

The slope of the oblique shoulder with respect to the plane preferably has a value in the range of values between 10% and 200%, preferably between 20% and 150%, and particularly preferably between 50% and 100%. For example, the slope of the sloping shoulder may be 100%, in which case a 45 ° sloping angle would be enclosed between the sloping shoulder and the plane.

When it is mentioned that the inclined shoulders of the blades are arranged at different heights from each other along the axis of rotation of the core, this means that they are arranged at positions at different distances from the head.

When reference is made hereinafter to a "high" element (e.g. a high shoulder), this means that the element is at a small distance from the head of the fastening device; whereas the "low" element is at a large distance from the head of the fastening device.

By arranging the inclined shoulders of the blades at mutually different heights along the axis of rotation of the core, a pulling effect can be achieved during mounting, which pushes or pulls the fastening device or the head of the fastening device in the direction of the plate-shaped element. The fastening device according to the invention therefore requires only a small mounting force.

The at least one set of blades, which is elastic at least in regions, has at least two, preferably more than two, particularly preferably more than five blades. For example, the at least one set of blades, which is elastic at least in the region, may advantageously have six blades.

A plate-shaped element is also understood to mean an element which has only an at least substantially plate-shaped region to which the fastening means are fastened. In addition to the substantially plate-shaped region, the plate-shaped element can be designed accordingly in some other way.

According to an advantageous development of the invention, the blades of the at least one group of blades, which are elastic at least in the region, are arranged close to each other in a manner classified according to the height of their sloping shoulders.

That is, for example, the inclined shoulders are arranged from high (near the head) to low (far from the head) as viewed from below in a clockwise direction around the circumference of the core of the fastening device.

According to an advantageous development of the invention, the point of the oblique shoulder of the blade which is furthest away from the head (i.e. the lowest point of the shoulder which is furthermore the furthest outside point of the oblique shoulder) is further away from the head (i.e. lower) than the point of the oblique shoulder of the adjacent blade which is arranged closest to the head (the highest point), which is further away from the head (i.e. lower).

This means, therefore, that the inclined shoulders of adjacent blades merge into each other in such a way that there is no gradual change between the inclined surfaces in a way that could cause the plate-like element to become in a way that disturbs the pulling effect of the fastening means during mounting. Thus, a uniform pulling effect without "stop" can be achieved by the design of the blade according to the invention.

According to an advantageous development of the invention, three sets of blades are formed which are elastic at least in regions, said blades preferably having the same design, wherein the blades are preferably arranged evenly distributed along the circumference of the core.

The result is therefore that three blades at the same height or a blade with an inclined shoulder at the same height are always formed. The groups are in this case arranged one behind the other in the circumferential direction, and the three blades with the oblique shoulders at the same height are therefore in each case spaced apart from one another in the circumferential direction, wherein an angle of 120 ° spans between each blade. Accordingly, the blades are also arranged uniformly in the circumference.

If each set of blades has six blades in each case, three blades in each case will therefore be arranged flush, with six different heights (of the oblique shoulders).

According to an advantageous development, each of these blades has a connection region which connects the respective shoulder to the core.

According to an advantageous development of the invention, the respective connection regions of at least one of the blades, preferably of a plurality of blades, particularly preferably of all blades adjacent to the respective shoulder, form a stop region which is formed at least substantially orthogonally with respect to a plane with the axis of rotation of the core as a perpendicular. The stop region is thus vertical or a vertical plane. Alternatively, however, it is also conceivable for the stop region to be designed as a curved surface.

This means that the stop region is also formed orthogonal to the main direction of extension of the plate-like element and thus parallel to the inner wall of the hole of the plate-like element to which the fastening means is fastened. The stop region can correspondingly form a stop for the plate-like element and the plate-like element is thus held securely.

According to an advantageous development of the invention, the connecting region on the side facing the head has at least substantially no slope with respect to a plane with the axis of rotation of the core as a perpendicular.

In other words, the surface of the side of the connection region facing the head is a horizontal surface. The surface also extends simultaneously parallel to a plane with the axis of rotation of the core as a perpendicular.

According to an advantageous development of the invention, the connecting region on the side facing the head has a slope or a bevel profile with respect to a plane with the axis of rotation of the core as a perpendicular.

Thus, the upper side (facing the head) does not form a horizontal surface, but has a curvature. In this embodiment, the connection region may be incorporated into the shoulder.

Irrespective of how the side of the connection region facing the head is formed, the side of the connection region facing away from the head (i.e. the lower side) is preferably always curved (i.e. formed with a slope or bevel profile) in order to permit simple mounting of the fastening device.

According to an advantageous development of the invention, the connection regions are formed at the same height along the axis of rotation of the core.

According to an advantageous development of the invention, these connection regions are formed at mutually different heights along the axis of rotation of the core.

This means that the side of the connection region of the blade facing the head may be at the same distance from the head or may be at different distances from the head to each other.

According to an advantageous development of the invention, the outer region of the oblique shoulders of at least one of the blades, preferably of a plurality of blades, particularly preferably of all blades, has no slope with respect to a plane with the axis of rotation of the core as a perpendicular.

This means that the outer area of the inclined shoulder is correspondingly a horizontal surface. Thus, the outer area (horizontal surface) is oriented perpendicular to the inner wall of the hole in the plate-like element and thus a good fastening force can be applied.

According to an advantageous development of the invention, the head has a plate-shaped base region and an annular region which surrounds the base region and projects in the direction of the foot.

According to an advantageous development of the invention, the fastening device furthermore has a sealing material which is arranged in a surrounding manner on the surface of the head which points in the direction of the foot (downwards).

According to an advantageous development of the invention, the annular region is laterally covered with sealing material at least in regions, preferably completely.

The complete coverage of the sealing material has the advantage that the sealing material can only expand in the direction of the plate-shaped element and inwards when it expands (e.g. under heat treatment or application of heat) and thus a very good sealing effect is achieved.

In addition, the solution according to the invention consists in a method for producing a fastening device, having the following steps: injection molding a head and a foot of a fastening device, wherein an annular region of the head is directed in a direction opposite the foot; inserting an intermediate product consisting of an injection-molded head and foot into a mold; closing the mold, wherein the annular region of the head is pressed down in the direction of the foot during the closing of the mold or is pressed down in the direction of the foot by means of a manipulator, in particular a robot, in particular in each case in such a way that, at least after the closing of the mold, the annular region protrudes from the plate-shaped base region in the direction of the foot; and injecting a sealing material on a surface of the head portion directed in the direction of the foot portion.

This method offers the advantage, in particular, that the intermediate product consisting of the injection-molded head and foot is injection-molded in such a way that the annular region of the head does not point in the direction of the foot. If the annular region of the head is already directed towards this junction in the direction of the foot, the formation of a blade that is elastic at least in the region may be disturbed by the annular region.

The geometry of the annular region of the head pointing in the opposite direction to the foot can thus be better produced by means of injection moulding. By rotating around the annular region during the closing of the mould, the advantages of the annular region present in combination with the sealing material can also be simultaneously utilized.

Drawings

The invention will be explained in more detail below using a description of exemplary embodiments with reference to the drawings.

In the drawings:

fig. 1 shows a schematic top view of a fastening device according to the invention from obliquely below;

fig. 2A to 2C show schematic representations of the foot of the fastening device in different embodiments;

figure 3 shows a schematic illustration of a blade of a fastening device according to the invention;

figure 4 shows a schematic representation of another foot of the fastening device according to the invention;

fig. 5A to 5C show top views of a fastening device with blades in different embodiments;

fig. 6A to 6C show schematic representations of the head of a fastening device according to the invention in different embodiments; and

fig. 7 shows a representation of a method for producing a fastening device according to the invention.

Detailed Description

Referring initially to fig. 1, a schematic top view of a fastening device 100 according to the present invention is shown.

The fastening device 100 has a head 110 and a foot 120. The sealing material 130 is arranged in a circumferential manner on the underside of the head 110 (the side facing the foot 120).

The foot 120 extends downward from the head 110 in fig. 1 and has a core 121 and a plurality of blades 122.

The blades 122 extend outwardly from the core 121. The blades 122 are arranged in groups, wherein in this embodiment of the fastening device 100 a group of blades 122 has six blades 122 at different heights.

Each blade 122 has an inclined shoulder 123, wherein the inclined shoulder 123 is formed on the outer edge of the corresponding blade 122.

The inclined shoulders 123 of the blades 122 in a group of blades 122 are arranged at different heights from each other. That is, the angular shoulders 123 of each blade 122 of a set of blades 122 vary in distance from the head 110 or differ from one another.

The fastening device 100 in fig. 1 has three sets of blades 122, each set having six blades 122. Each set of blades 122 is here of the same construction and therefore three blades 122 with inclined shoulders 123 at the same height are arranged on the core 121 of the foot 120, for a total of six times.

The blades 122 in the respective set of blades 122 are sorted by height or by the height of their sloping shoulders 123.

In this embodiment, the inclined shoulders 123 of one set of blades 122 are arranged to descend in a clockwise direction when viewed from below, that is, the inclined shoulders 123 of one set are arranged to be farther away from the head 110 in the clockwise direction.

In summary, the blades 122 are arranged in a uniformly distributed manner around the circumference of the core 121. That is, one third of the circumference of the core 121 is assigned to each of the three groups. This also means that, when the sets of blades 122 are of the same configuration, the blades 122 with the inclined shoulders 123 are evenly distributed at the same height (at the same distance from the head 110) over the circumference of the core 121. In particular, a circular segment with a center point angle of 120 ° is located between the set of blades.

If the fastening device 100 is inserted or mounted in a plate-like element or in a hole arranged in the plate-like element, the following effect occurs:

when the blade 122 with the lowermost arranged (furthest away from the head 110) inclined shoulder 123 is overcome, a pulling effect is produced which pulls the fastening device 100 or the head 110 of the fastening device 100 in the direction of the plate-like element. The reason is inter alia that the blade 122 is of flexible design and is pushed outwards in the plate-like element or the hole of the plate-like element and due to the inclined shoulder 123 of the blade 122 pulling the fastening device 100 in the direction of the plate-like element.

Fig. 2A to 2C show schematic representations of the foot 120 of the fastening device 100 according to the invention in different embodiments.

As illustrated in fig. 2A, the blade 122 has a connection region 124 that connects the angled shoulder 123 of the blade 122 to the core 121 of the foot 120.

A stopper region 125 having a substantially vertical surface is formed on a region of the connection region 124 adjacent to the inclined shoulder 123. Said stop area 125 serves as a stop for the plate-like element or the hole of the plate-like element.

As can be seen in fig. 2A to 2C, the stop regions 125 are arranged at different distances from the head 110. The fastening device 100 is thus suitable for plate-like elements having different thicknesses or thickness tolerances.

In short, the inner side of the hole of the thick plate-like element abuts against the blade 122 (or, in the case of three sets of blades 122, against three blades 122) which has a stop region 125 at a distance from the head 110. These are blades 122 arranged on the right side in fig. 2A.

In contrast, if a thin plate-like element is present, the fastening device 100 assisted by the above-described pulling effect is pushed or pulled into the hole of the plate-like element to such an extent that the inner wall of the hole of the plate-like element stops against a stop region 125 of the blade 122, which is arranged close to the head 110 of the fastening device 100. This applies to the left side of the blade 122 as fully shown in FIG. 2A.

The foot 120 shown in fig. 2A-2C furthermore shares the following features: their connecting region 124 has a substantially horizontal surface on the upper side (the side in the direction of the head 110). That is, the horizontal upper side of the connection region 124 is arranged orthogonal to the stop region 125 of the corresponding blade 122.

In other words, the upper side of the connection region 124 is arranged parallel to a plane having the rotation axis 121a of the core 121 as a perpendicular line (the upper side of the connection region 124 is parallel to a plane perpendicular to the rotation axis 121a of the core). In a corresponding manner, the stop region 125 of the blade 122 is arranged orthogonally with respect to said plane.

As is also apparent in fig. 2A to 2C, the region of the highest (smallest distance from the head 110) arrangement (i.e., the boundary region with respect to the stopper region 125) of the inclined shoulder 123 of the first blade 122 having the inclined shoulder 123 formed higher (closer to the head 110) is arranged higher (i.e., closer to the head 110) than the lowest region of the inclined shoulder 123 of the blade 122 (i.e., the outer region of the inclined shoulder 123). This ensures that there is a step-less transition between adjacent sloping shoulders 123 and provides a pulling effect without any damage.

The embodiment illustrated in fig. 2A-2C differs in the design of the blades 122. In fig. 2A, the upper side of the connection region 124 (the side oriented in the direction of the head 110) is arranged at different distances from the head 110, corresponding to the inclined shoulder 123 and the stop region 125 of the blade 122.

The underside of the blades 122 are formed substantially similarly and at the same height, and thus the blades 122 become smaller from the blade placed closest to the head 110 to the blade 122 located furthest away.

This embodiment has the advantage that only three stop areas 125 are in contact with the plate-like element and therefore friction (braking force during installation) occurs only in said stop areas.

In fig. 2B, the connection regions 124 are all arranged at the same height, i.e. all at the same distance from the head 110.

However, since the inclined shoulders 123 have to be arranged at different heights (i.e. at different distances from the head 110), the length of the stop region 125 is here changed. That is, the stop region 125 of the blade 122 arranged close to the head 110 is small, and the stop region 125 of the blade 122 arranged at a distance from the head 110 is relatively large.

This embodiment has the advantage that, when there are three sets of blades 122, the plate-like element can rest on more than just three stop areas 125 of the blades 122.

In fig. 2C, all vanes 122 have substantially the same design, wherein the height offset between the oblique shoulders 123 (and between the stop areas 125) occurs by the fact that: all the blades 122 are arranged at different heights or at different distances from the head 110 along the axis of rotation of the core 121.

Fig. 3 shows a schematic illustration of the blade 122. The blade 122 has a connecting region 124 and the inclined shoulder 123 already discussed. The blade 122 also has a (vertical) stop region 125.

In this embodiment, the blade 122 furthermore has an outer region 126 on the outside. The outer region 126 has an upper side that is oriented substantially horizontally. That is to say, the upper side is oriented substantially in the extension direction of the plate-like element. The horizontal upper side or surface serves to improve the retention of the fastening device 100.

Fig. 4 shows another embodiment of the foot 120 of the fastening device 100 according to the invention.

In this embodiment, the plurality of connection regions 124 of the blade 122 are not oriented horizontally, but rather are oriented obliquely or in an arcuate manner. As shown, the connecting region 124 here emerges without a step into the oblique shoulder 123 in such a way that no stop region 125 is produced.

In the embodiment illustrated in fig. 4, only the blade 122 having the inclined shoulder 123 located uppermost (closest to the head 110) has a stop region 125. Naturally, it is also conceivable for the next vane or vanes 122 to have a stop region 125.

In the case of a blade 122 with a stop region 125, the connecting region 124 is preferably designed as a horizontal surface, that is to say its upper side (toward the head 110) has a substantially horizontal surface.

Fig. 5A to 5C show top views of various fastening devices 100 according to the invention, which differ in the exact design of the connection region 124.

In fig. 5A, the connection region 124 has a slightly arcuate design from below (i.e. as seen in the direction of the axis of rotation of the core 121).

In fig. 5B, the connecting regions 124 of the blades 122 have a substantially rectilinear design, that is to say their extension intersects on the axis of rotation of the core 121.

In fig. 5C, the connection region 124 of the blade 122 has a bent shape, wherein the bend is formed by a change in the slope of the connection region 124.

This change in the connection area 124 makes it possible to influence the elastic behavior or flexibility of the blade 122. Thus, the blade 122 may have a more flexible and less flexible design by virtue of the shape of the connection region 124.

Fig. 6A-6C show various schematic illustrations of the head 110 of the fastening device 100.

For example, as illustrated in fig. 6A, the head 110 has a plate-like base region 111 and an annular region 112. The annular region 112 is formed substantially on the circumference of the plate-like base region and projects in the direction of the foot 120.

In addition, as shown in fig. 6A, the plate-like base region 111 may have a recessed portion into which the sealing material 130 may be injected.

The head illustrated in fig. 6A is covered with the sealing material 130 from above by means of the plate-shaped base region 111 and completely from the side by means of the annular region 112. That is, the sealing material 130 is exposed only downward and inward and may expand.

This is particularly relevant when the fastening device 100 is fastened to a plate-like element whenever the fastening device is subjected to the application of heat which causes the sealing material 130 to expand. If the head 110 surrounds the sealing material laterally and on top, the fastening device may expand only inwards and towards the plate-like element when it expands, and thus produce a good sealing effect of the sealing material 130.

In addition, the head 110 or the annular region 112 thereof may shield the sealing material 130 from external influences.

Fig. 6B shows an embodiment in which the annular region 112 has a flatter design and covers the sealing material 130 only in the area on the side face, and thus the area of the sealing material 130 is exposed towards the side face.

Fig. 6C shows an embodiment in which the annular region 112 has a flatter design, wherein the sealing material 130 surrounds the annular region in such a way that it is exposed at least in the region towards the side and upwards.

Thus, different embodiments of the head 110 and the sealing material 130 are contemplated.

Fig. 7 is a view for explaining a method of producing a fastening device according to the present invention. Specifically, there is shown a method for producing a fastening device 100 having a head 110 according to fig. 6A of the present invention.

In a first step, the head 110 and the foot 120 of the fastening device 100 are produced by means of injection molding, wherein the annular region 112, as shown in the upper drawing of the head 110 in fig. 7, does not point in the direction of the foot 120, but points in the opposite direction.

This has the advantage that the blades 122 can be formed on the foot 120 without interference from the annular region 112.

In a next step, the annular region 112 of the head 110 is folded in such a way that it now projects in the direction of the foot 120 (illustrated in the middle in fig. 7). This occurs, for example, by inserting the head 110 or the fastening device 100 into a mold, wherein the annular region 112 is pressed in the other direction when the mold is closed.

The annular region 112 is then in its final position and the sealing material 130 may be injected onto the head 110 (see the lower illustration of the head in fig. 7).