fastener

Abstract

The invention proposes a fastening (1) for sheet metal with a bell-shaped and slotted chuck (5) which is opened by axial clamping between a circular support (14) and a clamping device (8) and thereby engages the cover layer (20) of the sheet metal from below in an annular slot arranged in the sheet metal.

Description

TECHNICAL FIELD

[0001] The invention relates to a fastening element having the features of the preamble of claim 1 for fastening in a recess of a component and to a fastening assembly having the features of the preamble of claim 12 with such a fastening element. The fastening element is in particular provided for fastening in a lower, circular recess in a sheet, in particular an aluminum composite sheet with a mineral core. BACKGROUND

[0002] The publication DE 1961489 A1 discloses a fastening element with a collet having the shape of a hole disc with a conically, encircling and by a slot divided into segments outer edge. For fastening the outer edge of the collet is introduced into a circular and inclined, that is also conically, annular groove in a sheet, for example, so that the conically, encircling outer edge of the collet engages from below or from behind the also conically, annular groove in the sheet. SUMMARY

[0003] It is the task of the invention to propose a fastening element with a spreadable collet and a fastening assembly with such a fastening element.

[0004] This task is solved according to the invention by the features of claim 1 and 12. The subject of the dependent claims are advantageous design and improvement solutions of the invention. The fastening element according to the invention has a clamping shaft, a bell-shaped collet, a clamping device at the outer side of the collet and a bearing at the inner side of the collet. "Bell-shaped" refers to a particularly plate-like, dome-like two-dimensionally curved body which has an axially parallel or conically and annular segment at the outer edge of the collet, wherein the segment can be curved in axial direction at the outer edge. The collet can be rounded or angular not only in axial direction but also in radial direction. The convex side is referred to here as the outer side of the collet and the concave side as the inner side of the collet, wherein "convex" and "concave" refer not only to the rounded shape of the collet but also to the angular shape of the collet.

[0005] The bearing is at or in the concave inner side of the collet and between the outer edge of the collet and the clamping shaft in radial direction with respect to the clamping shaft.

[0006] The clamping device is on the convex outer side of the collet opposite the support and can be moved in axial direction or parallel to the clamping axis in the direction of the support in order to spread the collet, wherein the clamping device loads the collet axially between the clamping axis and the support starting from the unclamped state. With the clamping device the collet can be loaded radially inside the support in the direction of the support, wherein the collet is pressed against the support, whereby the collet swings around a ring-shaped swing line that surrounds the clamping axis. The swing line is defined or formed by the support. It can be circular, non-circular, such as elliptical or oval or polygonal. The swing of the collet when loaded with the clamping device against the support to the bell-shaped collet can also be understood as a swing around one or more swing axes that are tangential to the clamping axis at different positions in the circumferential direction around the swing axis. "Tangential" means a straight line in the radial plane of the clamping axis and with radial distance to the clamping axis. By the swing movement the collet of the fastener according to the invention is spread, that is to say the outer edge of the collet increases its radial distance to the clamping axis.

[0007] Preferably the collet, the clamping device and the support are coaxial to the clamping axis.

[0008] For fastening on a component, such as a plate, the outer edge of the collet of the fastener according to the invention is introduced into a recess, such as a ring-shaped groove or in particular a cylindrical depression, in the component and the collet is spread. By the spreading of the collet the outer edge of the collet is pressed radially outwards and thereby pressed from the inside against the circumferential wall of the recess in the component and in this way fastens the collet in the recess in the component by a form and / or shape locking. Depending on the strength of the component at the circumferential wall of the recess, the outer edge of the collet can be formed into the circumferential wall, whereby additionally a shape locking of the collet in the recess of the component is obtained.

[0009] The advantage of the invention is the possibility of fastening in axially low recesses, such as fastening in a ring-shaped groove or fastening in a cylindrical depression, and thereby fastening on thin components, such as plates. The fastener according to the invention is particularly suitable for plates or in general components with a stable cover layer and a core or similar assemblies behind the cover layer that have a lower mechanical strength, into which the outer edge of the collet can be pressed when spread, so that it engages from below or from behind the stable cover layer of the component. In particular the component is a composite plate that consists of a 0.5 mm thick cover layer made of aluminum and a 3 mm thick mineral core that is arranged between the cover layers. However, the fastener is not limited to such composite plates.

[0010] In the case of the opening of the collet of the fastener according to the application, the outer edge of the collet can move exclusively or substantially exclusively radially relative to the clamping axis. The collet of the fastener according to the application is preferably flattened in the axial direction in the case of opening in such a way that the outer edge of the collet not only increases its radial spacing from the clamping axis, but also moves in the axial direction towards the clamping device. As a result, the collet with its outer edge "pulls" the middle region of the collet radially inside the outer edge of the collet, "pulls" the clamping device and the abutment in the direction of the component, that is to say, in the case of this preferred embodiment of the application, the fastener can be said to be clamped in the direction of the component or towards the component in the case of opening, said fastener being fastened to the component.

[0011] In a preferred design of the application, the bell-shaped collet protrudes in the axial direction beyond the abutment in the direction away from the clamping device by an extent of not more than 3 mm and in particular not more than 2 mm. As a result, a "low" fastener is possible in the axial direction, which protrudes only slightly from the component, said fastener being fastened to the component.

[0012] The fastener according to the application preferably has an annular abutment, which surrounds the clamping axis. The abutment can be circular or non-circular and / or multi-variant. It is preferred, but not mandatory, that the abutment concentrically surrounds the clamping axis. In this preferred design of the application, the collet swings in the case of opening about an annular swing line, said swing line surrounding the clamping axis and said swing line defining the abutment. The swinging movement is two-dimensional and increases the radial spacing of the outer edge of the collet from the clamping axis.

[0013] In one design of the application, the fastener has a threaded rod, which passes through the hole, in particular the middle hole in the collet, and which defines the clamping axis. The threaded rod can be, for example, a screw rod, a bolt or a threaded rod of the abutment. It enables the axial movement of the clamping device in the clamping direction, which points in the direction of the abutment, by means of the screwing movement of the clamping device on the threaded rod. The axial movement of the clamping device loads the collet towards the abutment and thus causes the opening of the collet.

[0014] The clamping device is formed, inter alia, by a nut and a washer, wherein the washer is loaded in the axial direction on the threaded rod by the rotation of the nut on the threaded rod in the clamping direction and the opening of the collet thereby occurs as described. On the washer, a resilient sealing element can be arranged, which is arranged, inter alia, on the outer circumference of the washer and which, inter alia, extends beyond the washer in the clamping direction or in the direction of the collet so far that the sealing element exerts a sealing action between the component and the recess in the component when the fastening is used in accordance with the application when the fastening is arranged in the recess of the component and the collet is in the opened state. In other words, the sealing element is constructed in such a way that it prevents or at least strongly inhibits the ingress of moisture into the recess of the component when the fastening is arranged in the recess and the collet is opened.

[0015] The threaded rod is preferably connected to the support in a torsion-proof and tension-proof manner, in particular is an integral part of the support or is rigidly connected to the support in any case. For example, the support is a disc-shaped screw head or is formed by a disc-shaped screw head of a screw, the screw shank of which forms the threaded rod.

[0016] One design variant of the application provides for a slot in the collet, which extends from the outer edge of the collet inwards in the direction of the clamping axis and ends at a distance from the clamping axis. The slot in the collet ends outside the hole or the intermediate hole of the collet, provided that the collet has a hole or an intermediate hole. The slot divides the collet into an opening section, which makes the opening of the collet easier. In this design variant of the application, the opening force for opening the opening section radially outwards is increased compared to the clamping force with which the clamping device loads the collet in the axial direction on the support.

[0017] In another design variant of the application, cutting elements are configured on the outer edge of the collet. In particular, one or more cutting elements are configured on the outer edge of each opening element. By means of the cutting elements, the insertion of the outer edge of the collet into the circumferential wall of the recess of the component is facilitated when opening the collet. In other words, the cutting elements achieve a reduction of the force that is required for pressing the collet into the circumferential wall. The support of the fastening in the component is also improved thereby in general. "Cutting elements" are elements that facilitate the insertion of the outer edge of the collet into the circumferential wall. These cutting elements can be configured, for example, as blades, knurls, Z-angles or similar structures.

[0018] To form the support, one design variant of the application provides for a support plate, the circumferential or encircling edge of which forms the support at the transition from the outer circumference of the support plate to the end side facing the collet. The transition from the outer circumference of the support plate to the end side, which forms the support, can also be rounded or have a chamfer. The support plate can be circular, non-circular or polygonal, for example.

[0019] One refinement of the application provides a flat end side of the carrier plate on the side facing towards the collet. Another design of the application, which can also be implemented together with the flat end side of the carrier plate, provides a flat end side of the clamping device on the side facing towards the collet. The combination of the two refinements allows the collet to be clamped flat between the clamping device and the carrier plate.

[0020] In one design of the application, the end side of the clamping device facing away from the collet is likewise flat as an abutment surface for an attachment part.

[0021] One design of the application likewise provides a flat or recessed end side of the carrier plate on the side facing away from the collet as an abutment surface for a component or in order to form an annular abutment for a component.

[0022] The subject of the fastening assembly according to the application having the features of claim 12 is a component, in particular an aluminum composite panel as explained above, having a core, in particular a mineral core, having a recess with a peripheral wall and a fastening element as explained above, the collet of which is so spread in the recess of the component that the outer edge of the collet is pressed from the inside against the peripheral wall of the recess and is preferably pressed into the peripheral wall of the recess. The outer edge of the collet, which is pressed from the inside against the peripheral wall of the recess, holds the fastening element in the recess by force locking (= frictional locking). When the outer edge of the collet is pressed into the peripheral wall of the recess of the component, there is additionally a form locking. The recess in the component is for example an annular groove, the outer groove side wall of which forms the peripheral wall of the recess or in particular a cylindrical depression. The recess, the annular groove or the depression can be circular, non-circular or polygonal. The list is exemplary and not exhaustive. In the spread state of the fastening element in the component, the carrier plate is in particular in planar contact with the cover layer of the component, in particular with the cover layer made of aluminum. By means of the clamping device, the carrier plate is pressed against the cover layer in the spread state of the fastening element. It is also possible, however, that the carrier plate is arranged inside the recess, in particular inside the cylindrical depression, and below the cover layer, i.e. inside the core. In particular the diameter of the washer of the clamping device with respect to the clamping axis is greater than the diameter of the cylindrical depression, whereby the washer is in particular in contact with the cover layer or clamped thereto in the clamped state. As already described, the washer can have a sealing element which is in contact with the cover layer in the clamped state and thereby prevents the ingress of moisture into the recess of the component.

[0023] In one design of the application, the component is a sheet which is not thicker than 5 mm. In a design of the application, the depth of the recess is at least as great as half the thickness of the sheet.

[0024] The features and combinations of features, embodiments, and designs mentioned above in the specification, as well as the features and combinations of features mentioned below and / or illustrated in the drawings, can be used not only in the corresponding described or illustrated combinations, but also in virtually any other combination, or even individually. Embodiments of the invention not having all the features of the dependent claims are possible. Each feature of the claims can also be replaced by other disclosed features or combinations of features. The following embodiments of the invention are possible, and these embodiments do not have all the features of the embodiments, but rather any portion of the prominent features of the embodiments. Attached Figure Description

[0025] The invention will now be explained in detail with the aid of two embodiments shown in the figures. Wherein:

[0026] Figure 1 An axial cross-section of the fastener according to the invention in the unspread state within the component is shown in the first fastening configuration of the first embodiment.

[0027] Figure 2 It shows Figure 1 The condition of fasteners in the component being stretched out;

[0028] Figure 3 The second fastening configuration shown in the second embodiment is illustrated. Figure 1 The fasteners according to the present invention, in Figure 1 The state in which the components are not stretched open;

[0029] Figure 4 It shows Figure 3 The state of the fastening configuration when it is stretched open. Detailed Implementation

[0030] The fastener 1 according to the invention shown in the figure is configured for fastening to a thin plate or for fastening the thin plate to, for example, a building facade (not shown) by means of the fastener 1. The plate is hereinafter referred to as component 2. For simplicity, the same reference numerals are used for the two embodiments below, and only the differences are indicated. The first fastener is configured in... Figure 1 and 2 The first embodiment is shown in the middle and the second fastening configuration is in Figure 3 and 4 The second embodiment is shown in the figure.

[0031] Fastener 1 has a screw 3 with a disc-shaped screw head 4, a bell-shaped collet 5, and a nut 6 with a washer 7 as a clamping device 8.

[0032] The collet 5 has the shape of a two-dimensionally arched dome, which is referred to here as bell-shaped. "Bell-shaped" means a hollow body of revolution or a shell of a body of revolution, the resulting curve of which is an arc or a line that is arched in one direction. It is also possible that a straight line (not shown) is the generator of the body of revolution. In the embodiment, the line that generates the body of revolution of the collet 5 or the bell shape of the collet 5 has a curvature or a bend in the vicinity of the outer end of the collet in the opposite direction to the rest of the generated line. That is to say, the bell-shaped collet 5 has, in the present embodiment, a ring segment at its arched outer edge 16, the arch of which is opposite to the arch of the collet 5 inside the ring segment. A cutting element (not shown) is arranged on the outer edge 16 of the collet 5.

[0033] The convex side of the collet 5 is referred to hereinafter as the outer side 11 and the concave side of the collet 5 is referred to as the inner side 12.

[0034] The collet 5 has a central bore 9, through which the screw shank of the screw 3, which is referred to hereinafter generally as the threaded shank 10, passes coaxially. The disc-shaped screw head 4 is above or in the inner side 12 of the collet 5. The nut 6 is screwed onto the screw shank or threaded shank 10 on the outer side 11 of the collet 5 and the washer 7 is arranged on the threaded shank 10 between the nut 6 and the collet 5. The axis of the threaded shank 10 forms the clamping axis 13 of the fastener 1 according to the invention, the collet 5 being arranged coaxially with the axis of the screw shank 10.

[0035] The outer circumference of the screw head 4 or the transition from the outer circumference of the screw head 4 to the underside facing the collet 5 forms a seat 14 for the collet 5, which is circular in the present embodiment. The transition from the outer circumference of the screw head 4 to the underside 4 forming the seat 14 can have an edge or a chamfer, as in the present embodiment, or be rounded, for example.

[0036] The disc-shaped screw head 4 forms a seat plate 17 with a ring-shaped seat 14 on its outer circumference. The screw shank forming the threaded shank 10 of the fastener 1 according to the invention is torsion-proof and tension-proof and is integral with the screw head 4 forming the seat plate 17 in the present embodiment.

[0037] To fasten the fastener 1 according to the invention in the first fastening configuration of the first embodiment (shown in Figure 1 and 2 ), the component 2 has a circular ring groove, which is referred to hereinafter generally as the recess 15 of or in the component 2. It is also possible, for example, that a circular depression is used as the recess (not shown). The circular shape is not mandatory in any case, a polygonal or multiangular recess in the component 2 is also possible (not shown).

[0038] For fastening on the component 2, the outer edge 16 of the collet 5 is introduced into the recess 15 of the component 2 and the collet 5 is spread in a manner to be described yet. In the fastening of the fastener 1 on the component 2, the concave inner side 12 of the clock-shaped collet 5 and the screw head 4 face the component 2. The screw head 4 is between the collet 5 and the component 2 on the outside of the component 2 above or in the inner side 12 of the collet 5.

[0039] For spreading the collet 5, the nut 6 is screwed on the threaded rod 10 in the direction of the collet 5, which nut together with the washer 7 forms the clamping device 8 of the fastener 1 according to the invention. The axial movement of the clamping device 8 in the direction of the collet 5 and in the direction of the bearing 14 is also referred to here as movement in the clamping direction. Here, the nut 6 loads the collet 5 through the washer 7 in the direction of the end side of the screw head 4 facing the collet 5, which end side can also be referred to as the lower side of the screw head 4. In the spreading or for the spreading, the nut 6 or the washer 7 loads the collet 5 in the region inside the bearing 14, annularly surrounding the intermediate hole 9 and thus also the clamping shaft 13, in the direction of the screw head 4 with the bearing 14, that is to say in the clamping direction.

[0040] For the spreading, the collet 5 is clamped between the screw head 4 and the clamping device 8 and is pressed in the clamping direction, that is to say axially, relative to the clamping shaft 13, towards the annular bearing 14. In the spreading or for the spreading, the clock-shaped collet 5 is flattened, that is to say its axial height and its arch are reduced. The collet 5 swings around the bearing 14, which forms an annular, swinging line surrounding the threaded rod 10 and the clamping shaft 13 outside the intermediate hole 9 of the collet 5. By the swinging around the bearing 14 or the annular swinging line, the outer edge 16 of the collet 5 moves radially outwards, which expands the radial spacing to the clamping shaft 13. By the flattening of the clock-shaped collet 5 in the spreading or by the swinging around the annular bearing 14, the outer edge 16 of the collet 5 not only moves radially outwards, but also axially, that is to say parallel to the clamping shaft 13, counter to the clamping direction, that is to say in the direction of the nut 6 and the washer 7 together forming the clamping device 8. Here, the collet 5 moves the screw head 4 in the direction of the component 2, on which the fastener 2 is fastened by the spreading of its collet 5 in the recess 15. In the present embodiment, the collet 5 loads or clamps the screw head 4 against the component 2 in the spreading.

[0041] The swiveling of the collet 5 around the annular seat 14 when expanding the collet 5 is not necessarily exclusively a swiveling movement of rotation, but can additionally have a translatory rolling movement of the collet 5 on the annular seat 14, especially if the seat 14 is, as in the present embodiment, chamfered or rounded. That is, the annular seat 14 or more precisely the annular swivel line formed by the seat 14, on which the collet 5 rests, can change its radius during the expansion, the seat 14 "wandering" or moving radially when expanding.

[0042] The disc-shaped screw head 4, which forms the seat plate 17 of the fastener 1 according to the invention, is in the present embodiment flat and has a flat lower side and a flat upper side. The flat upper side of the seat plate 17 facing the component 2 is loaded or clamped against the component 2 in axial direction by the expansion of the collet 5 relative to the clamping axis 13 and stabilizes the fastener 1 and especially its threaded shank 10 against tilting out of its right angle position projecting from the component 2. The upper side of the screw head 4 forming the seat plate 17, which rests on the component 2, forms a flat resting surface of the fastener 1 in radial plane relative to the clamping axis 13 for resting on the component 2. The lower and upper sides of the screw head 4 are in the present embodiment flat end sides of the seat plate 17.

[0043] In order to be able to expand the collet 5 with a small force, the collet has a slot 18, which extends from the outer edge 16 of the collet inwards over the seat 14. In the present embodiment, the slot 18 extends radially, although this is not mandatory for the invention. Also, the slot 18 is not necessarily straight, as is different from the present embodiment. The slot 18 divides the bell-shaped collet 5 into strip-shaped expansion sections 19, which in the present embodiment extend radially from the inside of the seat 14 all the way to the outer edge 16 of the collet 5. The strip-shaped expansion sections 19 in the present embodiment swivel around the circular seat 14 when expanding the collet 5 as described above, wherein the outer end of the swiveling expansion section 19 moves radially outwards and at the same time moves in axial direction towards the clamping device 8. By the last movement, the collet 5 clamps the screw head 4 against the component 2 with its upper side forming the flat resting surface of the fastener 1 when expanding.

[0044] The expansion section 18 of the collet 5 swivels around the circular seat 14 when expanding, which can also be understood as a swiveling of the expansion section 19 around a swivel axis tangential to the circular seat.

[0045] The underside of the screw head 4 facing the collet 5 and the washer 7, which is part of the clamping device 8, forming the bearing plate 17, is flat. Thereby, the collet 5 can be flattened, that is to say, its arch shape can be reduced, inside the bearing 14 until the collet 5 is flat inside the bearing 14. Radially outside the bearing 14, the collet 5 remains in its two-dimensionally arched state and the springing section 19 remains in its arched state.

[0046] In the present embodiment, the outer edge 16 of the bell-shaped collet 5 protrudes in the axial direction by an extent of approximately 2 mm and not more than approximately 3 mm beyond the upper side of the screw head 4. Thereby, the fastener 1 according to the invention requires only a low recess 15 for fastening it on the component 2 and can be fastened on thin components 2, for example on plates having a thickness of only 5 mm.

[0047] If the plate or component 2 has a firm cover layer 20 and a core 21 or a similar assembly of less strength, the outer edge 16 together with the outer end of the cutting or springing element 19 formed on the outer edge of the collet 5 is pressed into the core 21 or similar assembly of the component 2 when springing the collet 5 and engages from below or from behind the more stable cover layer 20. Thereby, in addition to the improved force-locking support of the fastener 1 on the component 2, a form-locking of the fastening of the fastener 1 in the recess 15 of the component 2 is achieved.

[0048] The nut 6 as part of the clamping head 8 has a flat, circular end face. The end face of the nut 6 or of the clamping device 8 facing away from the collet 5 forms a flat abutment face 22 for a not shown house facade or the like, on which a plate forming the component 2 can be fastened by means of the fastener 1 according to the invention, or for a not shown accessory or the like, which can be fastened on the accessory or the like by means of the fastener 1 according to the invention.

[0049] The fastener 1, by means of the springing of its collet 5 in the recess 15 of the component 2, forms a fastening assembly according to the invention.

[0050] In Figure 3 and 4 a second embodiment is shown in the form of a second fastening configuration of the fastener 1 on the component 2. The second fastening configuration differs from the first fastening configuration shown in Figure 1 and 2 mainly in that the bearing plate 17 or the screw head 4 is arranged below the cover layer 20 and thereby inside the core 21. The recess 15 is configured as a cylindrical depression in the component 2 in the second embodiment. The dimensions of the washer 7 are designed in the second fastening configuration such that Figure 4In the open state of the fastening part 1 the washer 7 comes into contact with the cover layer 20. In this way the fastening part 1 is additionally stabilized in the component 2 and the holding value is increased. Furthermore, in this way it is avoided that the relatively soft cover layer 20 consisting of aluminium is arched or bent upwards against the clamping direction by the collet 5. In the second embodiment the washer 7 of the fastening part 1 has a sealing element 23 in the form of a ring-shaped seal around the washer 7. The sealing element 23 extends in the direction of the cover layer 20 and comes into contact with it in the clamped state, which is shown in Figure 4 . In this way it is not possible for moisture to penetrate between the cover layer 20 and the washer 7 into the recess 15. At least the penetration of moisture is effectively prevented. Between the nut 6 and the washer 7 a particularly planar attachment (not shown) can be arranged.

[0051] List of reference signs:

[0052] 1 fastening part

[0053] 2 component

[0054] 3 screw

[0055] 4 screw head

[0056] 5 collet

[0057] 6 nut

[0058] 7 washer

[0059] 8 clamping device

[0060] 9 intermediate hole

[0061] 10 threaded rod

[0062] 11 outer side surface

[0063] 12 inner side surface

[0064] 13 clamping shaft

[0065] 14 bearing

[0066] 15 recess

[0067] 16 outer edge

[0068] 17 bearing plate

[0069] 18 slot

[0070] 19 spreading element

[0071] 20 cover layer

[0072] 21 core

[0073] 22 abutment surface

[0074] 23 sealing element

Claims

1. A fastener (1) for fastening in a recess (15) of a component (2), having a bell-shaped collet (5) and a clamping shaft (13) passing through the collet (5), characterized in that, The fastener (1) has a clamping device (8) at the outer side (11) of the chuck (5) and a support (14) at the inner side of the chuck (5) between the outer edge (16) of the chuck (5) and the clamping shaft (13) at a radial distance relative to the clamping shaft (13). Starting from an unclamped state, the chuck (5) can be loaded along the clamping shaft (13) with the clamping device (8) at a radial distance smaller than the radial distance of the support (14) relative to the clamping shaft (13) such that the chuck (5) is pressed against the support (14) and thereby swings on the support (14) about a swing axis surrounding the clamping shaft (13) or about one or more swing axes tangent to the clamping shaft (13), thereby causing the outer edge (16) of the chuck (5) to move radially away from the clamping shaft (13).

2. The fastener (1) according to claim 1, characterized in that, The clamp (5) is flattened by being loaded with a clamping device (8).

3. The fastener (1) according to claim 1 or 2, characterized in that, The bell-shaped chuck (5) extends beyond the support (14) in the axial direction by an amplitude of no more than 3 mm.

4. The fastener (1) according to claim 1 or 2, characterized in that, The fastener (1) has an annular support (14) surrounding the clamping shaft (13) on the inner side (12) of the chuck (5).

5. The fastener (1) according to claim 1 or 2, characterized in that, The chuck (5) has a hole (9) surrounding the clamping shaft (13), the hole passing through a threaded rod (10), the threaded rod thus defining the clamping shaft (13) and enabling axial movement of the clamping device (8) relative to the threaded rod (10) by a twisting motion, such that the clamping device (8) abuts against the support (14) to load the chuck (5).

6. The fastener (1) according to claim 1 or 2, characterized in that, The chuck (5) has a slot (18) in its outer edge (16) that extends inward toward the clamping shaft (13) across the support (14) and divides the chuck (5) into a spreading section (19).

7. The fastener (1) according to claim 1 or 2, characterized in that, The fastener (1) has a support plate (17) and a support (14) is formed on the outer periphery of the support plate.

8. The fastener (1) according to claim 7, characterized in that, The end of the support plate (17) facing the clamp (5) is flat.

9. The fastener (1) according to claim 1 or 2, characterized in that, The end of the clamping device (8) facing the chuck (5) is flat.

10. The fastener (1) according to claim 1 or 2, characterized in that, The back side of the clamping device (8) is flat.

11. The fastener (1) according to claim 1 or 2, characterized in that, A cutting element is constructed at the outer edge (16) of the chuck (5).

12. The fastener (1) according to claim 3, characterized in that, The bell-shaped chuck (5) extends beyond the support (14) in the axial direction by an amplitude of no more than 2 mm.

13. A fastening assembly having a fastener (1) according to any one of the preceding claims and a member (2) having a recess (15), characterized in that, The recess (15) has a circumferential wall and the clamp (5) of the fastener (1) is spread out in the recess (15) of the member (2) by clamping the clamp (5) against the support (14) with a clamping device (8), such that the outer edge (16) of the bell-shaped clamp (5) is pressed radially outward and pressed against or into the circumferential wall of the recess (15) in the member (2).

14. The fastening assembly according to claim 13, characterized in that, The component (2) has a cover layer (20) that is thinner than the depth of the recess (15). The support plate (17) of the fastener (1) is placed planarly on the outer surface of the cover layer (20) of the component (2) or arranged inside the recess (15) and below the cover layer (20) when the chuck (5) is opened in the recess (15). The outer edge (16) of the chuck (5) opened in the recess (15) engages the cover layer (20) from the rear.

15. The fastening assembly according to claim 13 or 14, characterized in that, The component (2) is a thin plate and the depth of the recess (15) is at least half the thickness of the plate.

16. The fastening assembly according to claim 13 or 14, characterized in that, The recess (15) is an annular groove or a cylindrical sunken part.

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