Fasteners

Description

[0001] The invention relates to a fastener for fastening in a recess of a component, comprising the features of the preamble of claim 1, and a fastening arrangement comprising such a fastener, comprising the features of the preamble of claim 12. The fastener is particularly intended for fastening in a shallow, circular recess in, for example, a thin plate, in particular an aluminum composite plate with a mineral core.

[0002] German patent application DE 1 961 489 A1 discloses a fastener with a claw that has the shape of a perforated disc with a frustoconical, circumferential outer edge divided into segments by slots. For fastening, the outer edge of the claw is inserted into a circular and inclined, i.e., also frustoconical, annular groove in, for example, a plate, such that the frustoconical, circumferential outer edge of the claw engages under, or behind, the frustoconical annular groove in the plate.

[0003] The object of the invention is to propose a fastener with an expandable claw and a fastening arrangement with such a fastener.

[0004] This problem is solved according to the invention by the features of claims 1 and 12. The dependent claims describe advantageous embodiments and further developments of the invention. The fastener according to the invention has a clamping axis, a bell-shaped claw, a tensioner on an outer side of the claw, and an abutment on an inner side of the claw. "Bell-shaped" refers to a body that is particularly plate-shaped, dome-like, and two-dimensionally curved, with an axially parallel or frustoconical and annular section at an outer edge of the claw, wherein the section at the outer edge may be curved in the axial direction. The claw may be rounded or angular in both the axial and radial directions. A convex side is referred to here as the outer side and a concave side as the inner side of the claw, with "convex" and "concave" referring to both a rounded and an angular shape of the claw.

[0005] The abutment is located on or in the concave inner side of the claw and in a radial direction to the clamping axis between the outer edge of the claw and the clamping axis.

[0006] The clamp is located on the convex outer surface of the claw opposite the abutment and is movable axially or parallel to the clamping axis towards the abutment to spread the claw. Starting from an unclamped state, the clamp applies axial force to the claw between the clamping axis and the abutment. The clamp allows the claw to be applied radially within the abutment towards the abutment, pressing it against the abutment and causing it to pivot around an annular pivot line enclosing the clamping axis. This pivot line is defined by the abutment and can be circular, non-circular (e.g., elliptical or oval), or angular.The pivoting of the bell-shaped claw when it is acted upon by the clamp against the abutment can also be understood as a pivoting about one or more pivot axes tangential to the clamping axis at various points around a circumference around the pivot axis. "Tangential" means a straight line in a radial plane of the clamping axis and at a radial distance from the clamping axis. The pivoting movement spreads the claw of the fastener according to the invention, that is, the outer edge of the claw increases its radial distance from the clamping axis.

[0007] Preferably, the claw, the clamp and the abutment are coaxial to the clamping axis.

[0008] To fasten the fastener to a component, for example a plate, the outer edge of the claw is inserted into a recess, for example an annular groove or a (particularly cylindrical) countersink in the component, and the claw is spread open. Spreading the claw causes its outer edge to be pressed radially outwards and thus from the inside against a circumferential wall of the recess in the component, thereby securing the claw in the recess by frictional and / or positive locking. Depending on the strength of the component at the circumferential wall of the recess, the outer edge of the claw may form an impression in the circumferential wall, thereby additionally achieving positive locking of the claw in the recess of the component.

[0009] An advantage of the invention is the possibility of fastening in an axially shallow recess, for example in an annular groove or a cylindrical countersink, and thus fastening to a thin component, such as a plate. The fastener according to the invention is particularly suitable for a plate or, more generally, a component with a stable surface layer and a core or the like with lower mechanical strength beneath or behind the surface layer, into which the outer edge of the claw can penetrate when spreading, so that it engages beneath or behind the stable surface layer of the component. In particular, the component is a composite plate consisting of 0.5 mm thick aluminum surface layers and a 3 mm thick mineral core arranged between the surface layers. However, the fastener is not limited to such composite plates.

[0010] When the claw of the fastener according to the invention is spread open, the outer edge of the claw can move exclusively or substantially exclusively radially to the clamping axis. Preferably, when the claw of the fastener according to the invention spreads open, the claw becomes axially flatter such that the outer edge of the claw not only increases its radial distance from the clamping axis, but also moves axially in the direction of the clamp. As a result, the claw, with its outer edge, "pulls" its central region radially within its outer edge, the clamp, and the abutment towards the component. In other words, when spreading open, the fastener in this preferred embodiment of the invention is, so to speak, clamped towards or against the component to which it is attached.

[0011] In a preferred embodiment of the invention, the bell-shaped claw projects axially no more than 3 mm, and in particular no more than 2 mm, beyond the abutment in the direction away from the clamp. This makes it possible to use an axially "low" fastener that protrudes only slightly from the component to which it is or will be attached.

[0012] Preferably, the fastener according to the invention has an annular abutment that surrounds the clamping axis. The abutment can be circular or, other than circular, round and / or angular. Preferably, but not necessarily, the abutment surrounds the clamping axis concentrically. In this preferred embodiment of the invention, when the fastener is spread open, the claw pivots about an annular pivot line that surrounds the clamping axis and defines the abutment. The pivoting movement is two-dimensional and increases the radial distance of the outer edge of the claw from the clamping axis.

[0013] In one embodiment of the invention, the fastener has a threaded shank that passes through a hole, in particular a central hole, in the claw and defines the clamping axis. The threaded shank can be, for example, a screw shank, a threaded bolt, or a threaded shank of the abutment. A screwing motion of the clamp on the threaded shank enables axial movement of the clamp in the clamping direction, which is directed towards the abutment. The axial movement of the clamp acts on the claw against the abutment, thereby causing the claw to spread open.

[0014] The clamp is formed in particular by a nut and a type of washer, wherein the washer is axially acted upon by rotation of the nut on the threaded shank in the clamping direction against the claw, thereby causing the claw to spread open as described. An elastic sealing element can be arranged on the washer, which is particularly located on an outer circumference of the washer and, in particular, projects far beyond the washer in the clamping direction, or extends towards the claw, such that, when the fastener is used as intended, if it is in a recess of a component to be fastened and the claw is in an open state, the sealing element exerts a sealing effect between the component and the recess in the component.In other words, the sealing element is designed in such a way that the ingress of moisture into the recess of the component is prevented or at least strongly suppressed when the fastener is positioned in the recess and the claw is spread open.

[0015] Preferably, the threaded shank is rotationally and tensilely fixed to the abutment; in particular, the threaded shank is an integral part of the abutment or at least rigidly connected to the abutment. For example, the abutment is a disc-shaped screw head or is formed by a disc-shaped screw head of a screw whose screw shank forms the threaded shank.

[0016] One embodiment of the invention provides slots in the claw that extend inwards from the outer edge of the claw, across the abutment, towards the clamping axis and terminate at a distance from the clamping axis. If the claw has a hole or central hole, the slots terminate outside the hole or central hole. The slots divide the claw into spreading segments, which facilitates spreading the claw. In this embodiment of the invention, the spreading force with which the spreading segments are extended radially outwards is increased relative to the clamping force with which the clamp applies axial force to the claw against the abutment.

[0017] In a further embodiment of the invention, cutting elements are formed on the outer edge of the claw. In particular, one or more cutting elements are formed on the outer edge of each spreading element. These cutting elements facilitate the penetration of the outer edge of the claw into the circumferential wall of the recess in the component when the claw is spread. In other words, the cutting elements reduce the force required to press the claw into the circumferential wall. This also generally improves the fastener's hold in the component. "Cutting elements" are defined as elements that facilitate the penetration of the outer edge of the claw into the circumferential wall. These can be, for example, designed as cutting edges, knurling, serrations, or similar structures.

[0018] To form the abutment, one embodiment of the invention provides an abutment plate whose circumferential edge, or a circumferential edge, forms the abutment at a transition from the circumference to an end face of the abutment plate facing the claw. The transition forming the abutment from the circumference to the end face of the abutment plate can also be rounded or chamfered. The abutment plate can, for example, be circular, not rounded, or angular.

[0019] A further development of the invention provides for a flat end face of the abutment plate on the side facing the claw. Another embodiment of the invention, which can also be implemented in conjunction with the flat end face of the abutment plate, provides for a flat end face of the clamp on the side facing the claw. The combination of both possibilities enables the claw to be clamped flat between the clamp and the abutment plate.

[0020] In one embodiment of the invention, one end face of the tensioner facing away from the claw is also flat, serving as a contact surface for an attachment.

[0021] Similarly, one embodiment of the invention provides for a flat or concave end face of the abutment plate on a side facing away from the claw as a contact surface or for forming a ring-shaped contact for the component.

[0022] The fastening arrangement according to the invention, with the features of claim 12, comprises a component, in particular an aluminum composite panel as previously described, with a core, especially a mineral core, having a recess having a circumferential wall, and the fastener described above, the claw of which is spread open in the recess of the component such that the outer edge of the claw presses against the circumferential wall of the recess from the inside and is preferably pressed into the circumferential wall of the recess. The outer edge of the claw, pressed against the circumferential wall of the recess from the inside, holds the fastener in the recess by frictional engagement. Additionally, a positive fit exists when the outer edge of the claw is pressed into the circumferential wall of the recess of the component. The recess in the component is, for example, an annular groove, the outer side of which forms the circumferential wall of the recess, or, in particular, a cylindrical countersink.The recess, annular groove, or countersink can be circular, round, or angular. This list is exemplary and not exhaustive. When the fastener is expanded within the component, the abutment plate is in surface contact with a surface layer of the component, particularly the aluminum surface layer. The clamp presses the abutment plate against the surface layer when the fastener is expanded. However, it is also possible for the abutment plate to be located within the recess, particularly within the cylindrical countersink and below the surface layer, i.e., within the core. Specifically, the diameter of the clamp's washer with respect to the clamping axis is larger than the diameter of the cylindrical countersink, meaning that when clamped, the washer is in contact with, or clamped to, the surface layer.As already mentioned, the washer can have a sealing element which, when clamped, is in contact with the top layer and thus prevents moisture from entering the recess of the component.

[0023] In one embodiment of the invention, the component is a thin plate no thicker than 5 millimeters. In other embodiments of the invention, the recess is at least half as deep as the plate is thick.

[0024] The features and combinations of features, embodiments, and configurations of the invention mentioned above in the description, as well as the features and combinations of features mentioned below in the figure description and / or drawn in a figure, are not only usable in the combinations specified or drawn, but also in any other combination or individually. Embodiments of the invention are possible that do not have all the features of a dependent claim. Individual features of a claim can also be replaced by other disclosed features or combinations of features. Embodiments of the invention that do not have all the features of the exemplary embodiments, but rather any part of the characterized features of the exemplary embodiment or embodiments, are also possible.

[0025] The invention is explained in more detail below with reference to two exemplary embodiments shown in the drawings. The drawings show: Figure 1 shows an axial section of a fastener according to the invention in a non-spread state in a component in a first fastening configuration of a first embodiment; Figure 2 shows the fastener made of Figure 1 in the spread-out state in the component; Figure 3 the fastener according to the invention Figure 1 in an unspread state in the component of the Figure 1 in a second mounting configuration of a second embodiment; and Figure 4 the mounting configuration of the Figure 3 in a spread-out state.

[0026] The fastener 1 according to the invention, as shown in the drawing, is designed for fastening to a thin plate or for fastening the thin plate to, for example, a facade (not shown) using the fastener 1. The plate will be generally referred to as component 2 below. For the sake of clarity, the same reference numerals will be used for both embodiments below, and only the differences will be described. A first fastening configuration is shown in the Figure 1 and 2 as a first embodiment and a second fastening configuration is in the Figures 3 and 4 as a second embodiment.

[0027] The fastener 1 has a screw 3 with a disc-shaped screw head 4, a bell-shaped claw 5 and a nut 6 with a washer 7 as a tensioner 8.

[0028] The claw 5 has the shape of a two-dimensionally domed cup, which is referred to here as bell-shaped. "Bell-shaped" refers to a hollow body of revolution or a shell of a body of revolution whose generating curve is an arc or a line curved in one direction. A straight line can also be the generating line of the body of revolution (not shown). In the exemplary embodiment, the line that generates the body of revolution forming the claw 5, or the bell shape of the claw 5, has an angle or bend near its outer end in a direction opposite to the other generating line. That is, the bell-shaped claw 5 has—in the exemplary embodiment—an annular section at its outer edge 16 with a curvature that opposes a curvature of the claw 5 within the annular section at the outer edge 16 of the claw 5.Cutting elements are arranged on the outer edge 16 of the claw 5 (not shown).

[0029] A convex side of the claw 5 will be referred to below as the outside 11 and a concave side of the claw 5 as the inside 12.

[0030] The claw 5 has a central hole 9 through which a screw shank of the screw 3 passes coaxially, which will subsequently be referred to generally as the threaded shank 10. The circular-disc-shaped screw head 4 is located on or in the inner surface 12 of the claw 5. The nut 6 is screwed onto the screw shank or threaded shank 10 on the outer surface 11 of the claw 5, and the washer 7 is arranged between the nut 6 and the claw 5 on the threaded shank 10. An axis of the threaded shank 10, to which the claw 5 is arranged coaxially, forms a clamping axis 13 of the fastener 1 according to the invention.

[0031] A circumference of the screw head 4, or a transition from the circumference to an underside of the screw head 4 facing the claw 5, forms an abutment 14 for the claw 5 – in the exemplary embodiment, a circular abutment. The transition from the circumference to the underside of the screw head 4 forming the abutment 14 can, for example, have an edge or a chamfer as in the exemplary embodiment, or, for example, be rounded.

[0032] The circular screw head 4 forms a bearing plate 17 with the annular abutment 14 on its circumference. The screw shank forming the threaded shaft 10 of the fastener 1 is rotationally and tensile-resistant, and in the exemplary embodiment is integral with the screw head 4 forming the bearing plate 17.

[0033] For fastening the fastener 1 according to the invention in the first fastening configuration of the first embodiment, shown in the Figure 1 and 2Component 2 has a circular annular groove, which will be referred to here in general terms as recess 15 of component 2 or in component 2. A circular countersink is also possible, for example (not shown). The circular shape is not mandatory in every case; a polygonal recess in component 2 is also possible (not shown).

[0034] To attach the fastener to component 2, the outer edge 16 of the claw 5 is inserted into the recess 15 of component 2, and the claw 5 is spread open in a manner to be described later. When the fastener 1 is attached to component 2, the concave inner surface 12 of the bell-shaped claw 5 and the screw head 4 face component 2. The screw head 4 is located outside component 2, on or within the inner surface 12 of the claw 5, between the claw 5 and component 2.

[0035] To spread the claw 5, the nut 6, which together with the washer 7 forms the tensioner 8 of the fastener 1 according to the invention, is screwed onto the threaded shank 10 in the direction of the claw 5. The axial movement of the tensioner 8 in the direction of the claw 5 and in the direction of the abutment 14 will also be referred to here as movement in a clamping direction. In this process, the nut 6 exerts force on the claw 5 via the washer 7 in the direction of an end face of the screw head 4 facing the claw 5, which can also be referred to as the underside of the screw head 4. During or for the spreading action, the nut 6 or the washer 7 exerts force on the claw 5 in an annular area within the abutment 14, enclosing the central hole 9 and thus also the clamping axis 13, in the direction of the screw head 4 that forms the abutment 14, i.e., in the clamping direction.

[0036] For spreading, the claw 5 is clamped between the screw head 4 and the clamping device 8 and pressed against the annular abutment 14 in the clamping direction, i.e., axially to the clamping axis 13. During spreading, the bell-shaped claw 5 is flattened, meaning its axial height and curvature decrease. The claw 5 pivots around the abutment 14, which forms the annular pivot line enclosing the threaded shank 10 and the clamping axis 13 outside the central hole 9 of the claw 5. By pivoting around the abutment 14, i.e., along the annular pivot line, the outer edge 16 of the claw 5 moves radially outward, increasing its radial distance from the clamping axis 13.Due to the flattening of the bell-shaped claw 5 during expansion, or by pivoting around the annular abutment 14, the outer edge 16 of the claw 5 moves not only radially outwards, but also axially, i.e., parallel to the clamping axis 13 against the clamping direction, i.e., in the direction of the nut 6 and the washer 7, which together form the clamp 8. In doing so, the claw 5 moves the screw head 4 towards the component 2, to which the fastener 2 is attached by expanding its claw 5 in the recess 15. In the exemplary embodiment, the claw 5 exerts pressure on, or clamps, the screw head 4 against the component 2 during expansion.

[0037] The pivoting of the claw 5 around the annular abutment 14 during the spreading of the claw 5 need not be exclusively a rotational pivoting movement, but can also additionally exhibit a translational rolling movement of the claw 5 on the annular abutment 14, particularly if the abutment 14 – as in the exemplary embodiment – ​​has a chamfer or is rounded. That is to say, the annular abutment 14, or more precisely the annular leg formed by the abutment 14 on which the claw 5 rests, can change its radius during spreading; the abutment 14 "moves" or displaces radially during spreading.

[0038] The screw head 4 – which in this exemplary embodiment is circular in shape – and forms the abutment plate 17 of the fastener 1 according to the invention, is flat in this exemplary embodiment and has a flat underside and a flat topside. The flat topside of the abutment plate 17, facing component 2, is subjected to axial force or tension against component 2 by the spreading of the claw 5 relative to the clamping axis 13, thus stabilizing the fastener 1 and, in particular, its threaded shank 10 against tilting from its position projecting perpendicularly from component 2. The topside of the screw head 4, which forms the abutment plate 17 and rests against component 2, forms a flat contact surface of the fastener 1 in a radial plane relative to the clamping axis 13 for contact with component 2. The underside and the topside of the screw head 4 are – in this exemplary embodiment, flat – end faces of the abutment plate 17.

[0039] To enable the claw 5 to be spread with less force, it has slots 18 that extend inwards from its outer edge 16 across the abutment 14. In the exemplary embodiment, the slots 18 run radially, although this is not essential for the invention. Likewise, the slots 18 do not have to be straight, unlike in the exemplary embodiment. The slots 18 divide the bell-shaped claw 5 into strip-shaped spreading segments 19, which extend from inside the abutment 14 – radially in the exemplary embodiment – ​​outwards to the outer edge 16 of the claw 5. When the claw 5 is spread, the spreading segments 19 – which are strip-shaped in the exemplary embodiment – ​​pivot about the circular abutment 14 as described above, whereby the outer ends of the spreading segments 19 move radially outwards and simultaneously axially in the direction of the clamp 8.Through the latter movement, the claw 5, when spreading, clamps the screw head 4 with its upper side, which forms the flat contact surface of the fastener 1, against the component 2.

[0040] During spreading, the spreading segments 19 of the claw 5 pivot around the circular abutment 14, which can also be understood as pivoting the spreading segments 19 around pivot axes tangential to the circular abutment.

[0041] The underside of the screw head 4, which forms the abutment plate 17 and faces the claw 5, and the washer 7, which is part of the clamp 8, are flat. This allows the claw 5 to be flattened within the abutment 14, i.e., its curvature reduced, until the claw 5 is flat within the abutment 14. Radially outside the abutment 14, the claw 5 remains two-dimensionally curved, and the spreading segments 19 remain curved.

[0042] In the exemplary embodiment, the outer edge 16 of the bell-shaped claw 5 projects axially by approximately 2 mm and no more than approximately 3 mm beyond the top surface of the screw head 4. As a result, the fastener 1 according to the invention requires only a shallow recess 15 for its attachment to the component 2 and can be attached to a thin component 2, for example, a plate with a thickness of only 5 mm.

[0043] If the plate or component 2 has a solid outer layer 20 and a core 21 or the like with lower strength, the outer edge 16 with the cutting elements of the claw 5 or outer ends of the spreading segments 19 formed thereon forms into the core 21 or the like of the component 2 when the claw 5 spreads and engages under or behind the more stable outer layer 20. This achieves a positive fit of the fastener 1 in the recess 15 of the component 2 in addition to a force fit, which improves the hold of the fastener 1 on the component 2.

[0044] The nut 6, which is part of the tensioner 8, has flat, annular end faces. One end face of the nut 5 or of the tensioner 8, facing away from the claw 5, forms a flat contact surface 22 for the facade (not shown) or the like, to which the plate forming the component 2 can be fastened with the aid of the fastener 1 according to the invention, or a contact surface 22 for an attachment (not shown) or the like, which can be fastened to the attachment or the like with the aid of the fastener 1 according to the invention.

[0045] The fastener 1, which is secured in the recess 15 of the component 2 by spreading its claw 5, forms a fastening arrangement according to the invention.

[0046] In the Figures 3 and 4A second embodiment is shown in the form of a second fastening configuration of the fastener 1 to the component 2. The second fastening configuration differs from the first fastening configuration, which is shown in the Figure 1 and 2 This is illustrated essentially by the fact that the abutment plate 17, or the screw head 4, is arranged below the cover layer 20 and thus within the core 21. In the second embodiment, the recess 15 is designed as a cylindrical countersink in the component 2. In the second fastening configuration, the washer 7 is dimensioned such that, in the expanded state, the Figure 4The washer 7 comes into contact with the cover layer 20. This further stabilizes the fastener 1 in the component 2 and increases the holding power. Furthermore, this prevents the relatively soft aluminum cover layer 20 from being bent or warped by the claw 5 against the clamping direction. In the second embodiment, the washer 7 of the fastener 1 has a sealing element 23 in the form of a circumferential seal around the washer 7. The sealing element 23 extends towards the cover layer 20 and is in contact with it when clamped, which in the Figure 4 This is shown. This prevents moisture from penetrating the recess 15 between the cover layer 20 and the washer 7. At the very least, moisture ingress is significantly inhibited. A flat attachment component (not shown) can be arranged between the nut 6 and the washer 7. 1 Fastener 2 Component 3 Screw 4 Screw head 5 Claw 6 Nut 7 Washer 8 Clamp 9 Center hole 10 Threaded shaft 11 Outer side 12 Inner side 13 Clamping shaft 14 Abutment 15 Recess 16 Outer edge 17 Abutment plate 18 Slot 19 Spreader segment 20 Cover layer 21 Core 22 Contact surface 23 Sealing element

Claims

1. A fastener (1) for fastening in a recess (15) of a component (2), comprising a bell-shaped claw (5) and comprising a tensioning axis (13) that passes through the claw (5), characterized in that the fastener (1) comprises a tensioner (8) on an outer side (11) of the claw (5) and a counter bearing (14) on an inner side of the claw (5) at a radial distance from the tensioning axis (13) between an outer edge (16) of the claw (5) and the tensioning axis (13), and in that, starting from an untensioned state, the claw (5) can be acted upon by the tensioner (8) in a tensioning direction at a smaller radial distance from the tensioning axis (13) than the radial distance of the counter bearing (14) from the tensioning axis (13) along the tensioning axis (13) in such a way that the claw (5) is pressed against the counter bearing (14) and thereby pivots about a pivot axis / es surrounding the tensioning axis (13) or about one or more pivot axis / es tangential to the tensioning axis (13) on the counter bearing (14), as a result of which the outer edge (16) of the claw (5) moves radially away from the tensioning axis (13).

2. The fastener (1) according to claim 1, characterized in that the claw (5) becomes flatter as a result of being acted upon by the tensioner (8).

3. The fastener (1) according to claim 1 or 2, characterized in that the bell-shaped claw (5) projects axially no more than 3 mm and in particular no more than 2 mm beyond the counter bearing (14).

4. The fastener (1) according to one or more of the preceding claims, characterized in that the fastener (1) comprises an annular counter bearing (14) surrounding the tensioning axis (13) on an inner side (12) of the claw (5).

5. The fastener (1) according to one or more of the preceding claims, characterized in that the claw (5) comprises a hole (9) surrounding the tensioning axis (13), through which a threaded shaft (10) passes, which defines the tensioning axis (13) and enables an axial movement of the tensioner (8) relative to the threaded shaft (10) by a screwing movement, in such a way that the tensioner (8) acts upon the claw (5) against the counter bearing (14).

6. The fastener (1) according to one or more of the preceding claims, characterized in that the claw (5) comprises slots (18) in its outer edge (16) which extend inwards in the direction of the tensioning axis (13) beyond the counter bearing (14) and divide the claw (5) into expansion segments (19).

7. The fastener (1) according to one or more of the preceding claims, characterized in that the fastener (1) comprises a counter bearing plate (17), the circumference of which forms the counter bearing (14).

8. The fastener (1) according to claim 7, characterized in that an end face of the counter bearing plate (17) facing the claw (5) is level.

9. The fastener (1) according to one or more of the preceding claims, characterized in that an end face of the tensioner (8) facing the claw (5) is level.

10. The fastener (1) according to one or more of the preceding claims, characterized in that an end face of the tensioner (8) facing away from the claw (5) is level.

11. The fastener (1) according to one or more of the preceding claims, characterized in that cutting elements are formed on the outer edge (16) of the claw (5).

12. A fastening arrangement with a fastener (1) according to one or more of the preceding claims and with a component (2) having a recess (15), characterized in that the recess (15) comprises a circumferential wall and in that the claw (5) of the fastener (1) is expanded in the recess (15) of the component (2) by tensioning the claw (5) with the tensioner (8) against the counter bearing (14) in such a way that the outer edge (16) of the bell-shaped claw (5) is pressed radially outwards and against or into the circumferential wall of the recess (15) in the component (2).

13. The fastening arrangement according to claim 12, characterized in that the component (2) comprises a cover layer (20) that is thinner than the recess (15) in depth, in that, when the claw (5) is expanded in the recess (15), the counter bearing plate (17) rests flat against an outer side of the cover layer (20) of the component (1) or is arranged inside the recess (15) and below the cover layer (20), and in that the outer edge (16) of the claw (5) expanded in the recess (15) engages behind the cover layer (20).

14. The fastening arrangement according to claim 12 or 13, characterized in that the component (2) is a thin plate and the recess (15) is at least half as deep as the thickness of the plate.

15. The fastening arrangement according to one or more of claims 12 to 14, characterized in that the recess (15) is an annular groove or a cylindrical countersink.