Expansion anchor

Abstract

The invention relates to an expansion anchor (1) comprising a plastic main part (2) having an expansion region (9) with an expansion body. The expansion anchor (1) additionally has at least one metal expansion element (3). According to the invention, at least one of the longitudinal ends (12, 13) of the expansion element (3) is supported in the main part.

Description

[0001] Description

[0002] Expansion dowel

[0003] The invention relates to an expansion anchor with the features of the preamble of claim 1.

[0004] A generic expansion anchor is known from published patent application DE 10 2014 107 719 A1. This known expansion anchor consists of a base body extending along a longitudinal axis. The base body is made of plastic and comprises an expansion area with a tip as the front end of the expansion anchor and a sleeve body with a circumferential collar at the rear end. In the expansion area, two plastic expansion webs running parallel in the direction of the longitudinal axis serve as expansion bodies. To improve the holding force in the event of heat and fire, cylindrical shell-shaped expansion elements made of sheet steel are arranged circumferentially between the two expansion webs. The side edges of the expansion elements are mounted in grooves formed along the side edges of the expansion webs.Once the expansion anchor is inserted into a drilled hole, the two plastic expansion bars and the two steel sheet expansion elements expand when an expansion screw is screwed into a screw channel in the base body. This means that the expansion screw presses outward against the drilled hole wall radially toward the longitudinal axis. If the plastic melts due to a fire, at least the two steel sheets remain, which provide the expansion anchor with residual load-bearing capacity.

[0005] The disadvantage of the conventional expansion anchor is that it is only suitable for use in solid, solid building materials such as concrete. If there is no stable borehole wall against which the expansion webs and expansion elements rest over a large part of their length and against which they are pressed, the longitudinal edges of the steel sheets can move out of the grooves during expansion and detach from the base body. The expansion screw then lacks counterpressure and cannot find a hold on the steel surfaces.

[0006] The object of the invention is to create an expansion anchor that exhibits improved expansion behavior while still maintaining residual load-bearing capacity after exposure to fire. This object is achieved according to the invention by an expansion anchor having the features of claim 1.

[0007] The expansion anchor according to the invention has a base body made of plastic and at least one expansion element made of metal.

[0008] The base body extends along a longitudinal axis, in particular from a front end of the expansion anchor in the direction of insertion to a rear end of the expansion anchor. In particular, the base body extends over a length that is longer than the length of the expansion element in the direction of insertion. The direction of insertion is the direction in which the expansion anchor is intended to be inserted into a drilled hole. Thus, the front end of the expansion anchor is the end that reaches the drilled hole first during its intended insertion. The base body has, in particular at its front end, a type of anchor tip and, in particular at its rear end, a circumferential flange-like collar. The direction of insertion usually runs parallel to or in the direction of the longitudinal axis. The longitudinal axis runs, in particular, centrally in the base body.In the expansion anchor according to the invention, the base body extends forwards and / or backwards at least as far as the metal expansion element. In particular, the base body extends longitudinally beyond the expansion element, extending further forwards and / or further backwards than the expansion element.

[0009] The base body is made of plastic, in particular in one piece, in particular in a single-component or multi-component injection molding process.

[0010] The base body of the expansion anchor according to the invention has an expansion area with an expansion body. The expansion area can be expanded by inserting an expansion screw into an expansion channel. The expansion anchor forms a fastening set with the expansion screw. The expansion body is an element in the expansion area which, when the expansion screw is inserted or screwed into the expansion channel, is pushed outwards from the longitudinal axis, thereby increasing the outer diameter of the expansion area, i.e. expanding it. If the expansion anchor is inserted into a drilled hole with its expansion area after planned insertion, the expansion area can only expand to a limited extent, up to the drilled hole wall, when the expansion screw is inserted. As the expansion screw is inserted further, the expansion screw presses the expansion body against the drilled hole wall, resulting in a frictional connection between the expansion area and the drilled hole wall, which can transfer forces.As a result, for example, an attachment can be fastened to an anchoring base, for example a wall made of concrete or masonry, using the expansion anchor according to the invention. The expansion body is in particular an expansion web which extends in particular longitudinally in the direction of the longitudinal axis. The metal expansion element is also arranged in the expansion area, like the expansion body, and is also expanded by the expansion screw when it is inserted or screwed into the screw channel. The expansion element extends in the direction of the longitudinal axis, i.e. at least one of its directional components extends in the direction of the longitudinal axis. In particular, the expansion element is designed as a type of elongated web which extends with its length in the longitudinal direction.

[0011] According to the invention, the metal expansion element is mounted with at least one of its longitudinal ends in the base body. This ensures that the expansion element is connected to the base body but can expand freely and independently of the base body, in particular independently of the expansion body. Thus, the expansion behavior of the expansion element can be adapted to different building materials. For example, it can be designed such that it buckles or twists in a cavity while retaining its support in the base body. Furthermore, the expansion anchor according to the invention can, due to the metal expansion element, exhibit residual load-bearing capacity after exposure to fire.

[0012] In embodiments of the expansion anchor according to the invention, the expansion element is mounted exclusively at one of its longitudinal ends in the base body. In other embodiments of the expansion anchor according to the invention, however, it may be preferable for the at least one expansion element to be mounted exclusively at both of its longitudinal ends, i.e., at the front and rear of the base body. The choice of mounting depends on the intended use of the expansion anchor and the desired expansion behavior.

[0013] The term "longitudinal end" here refers not only to the outermost point of the expansion element in the longitudinal direction, but also to an area, in particular a short end section, at a longitudinal end. The end section extends a maximum of 20 percent, in particular a maximum of 15 percent, in particular a maximum of 10 percent of the length of the expansion element in the insertion direction. In particular, the expansion element is not mounted on the base body in a central section of its longitudinal extension in such a way that the base body would impede any outward movement of this central section of the expansion element during expansion.

[0014] By supporting the expansion element at at least one of its longitudinal ends, the expansion element can move independently of the expansion body, at least along parts of its length, during expansion. Preferably, the expansion element is mounted in such a way that it can be moved outward, away from the longitudinal axis, relative to and independently of the expansion body.

[0015] “Mounted in the base body” means that the expansion element engages with at least one of its longitudinal ends into the base body and is in particular fastened in the base body. The expansion element spatially engages with the base body. In particular, the longitudinal end penetrates into the base body radially to the longitudinal axis. The longitudinal end is held in the base body in a form-fitting manner, whereby individual degrees of freedom are possible. In particular, the expansion element is held axially fixed in the base body with its longitudinal end. In particular, the expansion element is held fixed in the circumferential direction in the base body with its longitudinal end. The expansion element can, for example, be held axially displaceable, i.e. movable in the insertion direction, for example in a type of axial sliding guide. In addition, the expansion element can be clamped in the base body with its longitudinal end so that it bends inwards during movement radially away from the longitudinal axis.The metal expansion element therefore not only rests with at least one of its longitudinal ends on the outside of the plastic base body, but at least a part or parts of at least one of the longitudinal ends protrude inwards into the base body, in particular by at least 20 percent, in particular by at least 25 percent of the diameter of the base body at the engagement point. In particular, the front and / or rear end of the expansion element lies in the base body and is in particular enclosed by the base body. For this purpose, the longitudinal end can be completely or partially surrounded by plastic, for example, overmolded with plastic. The expansion element can be used as an insert during injection molding of the base body. Alternatively, the expansion element can be subsequently introduced into the expansion body, for example, clipped or pushed in.

[0016] The expansion element can touch the expansion body, lie flat against it, and / or slide along the expansion body during expansion. The expansion element and the expansion body can also be connected by expandable or tear-off connectors, which provide a type of transport lock but do not impede the expansion element's independent movement during expansion.

[0017] In particular, the expansion element is not covered by plastic on the inside and outside over more than half of its length, so that when expanded, the expansion screw comes into direct contact with the metal expansion element. This ensures that, in the event of a fire, the force transmission from the borehole wall to the expansion element and from the expansion element to the expansion screw remains unchanged. In the expansion area, the expansion element, together with the expansion body, in particular with the expansion web, at least partially encloses an expansion channel. In particular, the expansion channel is enclosed circumferentially by several expansion elements and / or by the expansion body, whereby individual circumferential openings may be present between the expansion element and the expansion body.

[0018] The expansion region of the expansion anchor according to the invention has a length in the insertion direction that corresponds to at least three times, in particular at least four times, the diameter of the expansion anchor. In particular, the expansion element has a length in the insertion direction that corresponds to at least three times, in particular at least four times, the diameter of the expansion anchor. In particular, the expansion element extends in the insertion direction over the entire expansion region. In the circumferential direction, the expansion element extends in particular only over a part, in particular a maximum of one quarter, of the circumference of the expansion anchor.

[0019] One or more expansion elements are arranged in the expansion area, with each expansion element being part of the base element and thus also made of plastic. A base element can, but does not have to, extend across the entire expansion area. Several expansion elements can also be arranged longitudinally, one behind the other, for example, several teeth that pivot outward independently of one another to expand the expansion screw when it is inserted into the expansion anchor.

[0020] In a preferred embodiment of the expansion anchor according to the invention, the expansion element is an elongated sheet metal strip. The sheet metal strip can be flat or curved. For example, the sheet metal strip can be bent into a C- or L-shape in cross-section. The sheet metal strip is, in particular in the direction of insertion, several times longer than its width in the circumferential direction and wider in the circumferential direction than its sheet thickness. The sheet metal strip is, in particular, at least five times as long as it is wide and at least twice as wide as it is thick. In particular, the sheet metal strip is a stamped part that is inexpensive to manufacture. In particular, the sheet metal strip is made from sheet steel. In this embodiment, the engagement in the base body is greater than the sheet thickness, in particular by a multiple, in particular at least twice, and in particular at least three times the sheet thickness.

[0021] The expansion element preferably has an angled section at at least one of its longitudinal ends, which engages in the base body for mounting. In particular, the end section forms the angled section. In particular, the angled section is bent radially inward towards the longitudinal axis. This section preferably has a T-shape, whereby the crossbar of the T does not have to be straight, but can also be curved, for example, and in particular forms the free longitudinal end. Preferably, both longitudinal ends of the expansion element are angled and preferably both angled sections are T-shaped. The T shape is simple and cost-effective to produce, for example by stamping, but ensures permanent, form-fitting mounting of the expansion element in the base body. In particular, the crossbar of the T forms a bearing axis about which the section can pivot.

[0022] Furthermore, it is preferred that the base body has at least two plastic expansion bodies designed as expansion webs, which are connected to one another at at least one of their longitudinal ends. The expansion webs are in particular elongated and have a length that corresponds to at least three times their width measured in the circumferential direction. The width corresponds in particular to at least their thickness measured in the radial direction. The longitudinal ends of the expansion webs are connected to one another, in particular in the circumferential direction, in particular by a sleeve-like connecting section. In their middle sections, the expansion webs are not connected to one another, so that they expand independently of one another and also independently of the expansion element.

[0023] In a further preferred embodiment of the expansion anchor according to the invention, the metal expansion element is connected to the base body in a rotationally fixed manner at least at its rear end in the circumferential direction. This means that the expansion element is mounted in the base body with its rear end such that the end cannot rotate relative to the base body about its longitudinal axis in the circumferential direction. In particular, the rear end is also connected to the base body in an axially fixed manner. In particular, it is also connected to the base body in a rotationally fixed and / or axially fixed manner at its front end in the circumferential direction.

[0024] The expansion anchor according to the invention preferably has at least two metal expansion elements that are not connected to each other. The expansion elements are individual parts. In particular, the two individual parts are identical, i.e., identically constructed, which facilitates the manufacture of the expansion elements and their connection to, or assembly on, the base body.

[0025] A preferred embodiment of the expansion anchor according to the invention comprises at least two metal expansion elements, each of which has a connecting web at one of its longitudinal ends, by means of which they are integrally connected to one another. Preferably, the two expansion elements are connected to one another via the connecting webs at their front longitudinal ends, preferably in such a way that the connecting webs form bearing elements for supporting the expansion elements in the base body. The connection of the two expansion elements enables the two metal expansion elements to be manufactured in one piece, for example, from a steel sheet, for example by stamping and forming.

[0026] Furthermore, it is preferred that the connecting web forms an abutment, for example, a type of nut, for the expansion screw, into which the expansion screw can engage with its thread when screwing into the expansion anchor and move the abutment from front to back, which supports the expansion of the expansion elements. In particular, this can achieve buckling and / or knotting of the expansion elements in the expansion area, whereby the expansion anchor according to the invention can also be used in hollow or panel building materials.

[0027] In a preferred embodiment of the expansion anchor according to the invention, the expansion anchor has a plurality of expansion webs and a plurality of expansion elements, wherein the expansion webs are arranged circumferentially between the expansion elements. This allows for a uniform expansion of the expansion area with a distribution of the expanding metal and plastic elements over the circumference.

[0028] 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 description of the figures and / or drawn in a figure can be used not only in the respective combination specified or drawn, but also in principle any other combinations or individually. Embodiments of the invention are possible which 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 which do not have all the features of the embodiment(s), but basically any part of the identified features of an embodiment, optionally in combination with one, several or all features of one or more further embodiments, are possible.

[0029] The invention is explained in more detail below with reference to three embodiments shown in the drawings.

[0030] Shown are: Figure 1 a first embodiment of an expansion anchor according to the invention in a perspective view;

[0031] Figure 2 individual parts of the expansion anchor of Figure 1;

[0032] Figure 3 shows a second expansion anchor according to the invention in a perspective

[0033] Depiction;

[0034] Figure 4 shows an expansion element of the second expansion anchor according to the invention in a perspective view;

[0035] Figure 5 shows a section through the expansion anchor according to the invention of Figure 3 in the plane

[0036] VV;

[0037] Figure 6 shows a section through the expansion anchor according to the invention of Figure 3 in the plane

[0038] VI-Vl;

[0039] Figure 7 is a perspective view of a third embodiment of an expansion anchor according to the invention;

[0040] Figure 8 shows an axial section of the expansion anchor from Figure 7; and

[0041] Figure 9 shows a bent sheet metal part with expansion elements of the expansion dowel from Figures 7 and 8 in a perspective view.

[0042] In principle, identical parts in the figures are provided with identical reference numbers.

[0043] The first expansion anchor 1 according to the invention, shown in Figures 1 and 2, has a base body 2 made of plastic with two elongated expansion webs 11 as expansion body 10 and two likewise elongated sheet metal strips 19 as expansion elements 3 made of metal. The two expansion elements 3 made of metal are individual parts that are not connected to one another. The base body 2 has the two expansion webs 11, which are connected at their front ends by a hinge 20. In the exemplary embodiment, the hinge 20 is formed by two plastic cords 21 arranged next to one another, which are manufactured in one piece with the two expansion webs 11 by injection molding. In the exemplary embodiment, the entire base body 2 is manufactured in one piece from plastic using the injection molding process. Thus, the plastic expansion webs 11 are connected to one another, in this case at their longitudinal ends.The plastic cords 21 form the front end 7 of the expansion anchor 1, which can also be referred to as the anchor tip, with which the expansion anchor 1 is systematically inserted in the insertion direction 6 for anchoring in a drilled hole in an anchoring base (not shown). The expansion anchor 1 extends from its front end 7 along a longitudinal axis 5, which runs parallel to the insertion direction 6, to a rear end 8, on which a flange-like collar 22 is formed.

[0044] The two plastic expansion bars 11 form a spreading area 9, in which the two metal expansion elements 3 are also arranged. The expansion bars 11 each have a strip-shaped bar 23 with a cylindrical outer surface, from the inside of which the first teeth

[0045] 24 protrude on both longitudinal sides of the web 23. The first teeth 24 on both longitudinal sides of the webs 23 are offset from one another in a longitudinal direction of the spreading webs 11.

[0046] The base body 2 of the expansion anchor 1 according to the invention is manufactured with unfolded expansion webs 11, that is to say the expansion webs 11 are arranged in extension to one another, as shown in Figure 2, in which the individual parts of the expansion anchor 1 are shown, namely the base body 2 with the two expansion webs 11 and the two sheet metal strips 19, which form the expansion elements 3 made of metal.

[0047] The two sheet metal strips 19, which form the metal expansion elements 3 of the expansion anchor 1 according to the invention, have an outwardly flat, strip-shaped yoke

[0048] 25, which extends, in the exemplary embodiment straight, in the longitudinal direction of the expansion elements 3, i.e., parallel to the longitudinal axis 5. The yoke 25 forms a flat outer surface. On both longitudinal sides of the yoke 25, second teeth 26 protrude inward, which are offset from one another in the longitudinal direction, just like the first teeth 24.

[0049] The sheet metal strips 19 are inserted into one of the two unfolded expansion webs 11 in such a way that the second teeth 26 are directed inwards and the yokes 25 are located approximately on a circumference of the expansion dowel 1 or the expansion webs 11.

[0050] The expansion elements 3 each have an angled, front section 14 at their front longitudinal ends 12, which engages in the base body 2 for mounting. The angled front section 14 is T-shaped and engages in a complementary pocket 28 of the base body 2. At the rear longitudinal ends 13 of the expansion elements 3, the strip-shaped yokes 25 project beyond the second teeth 26 and lie in longitudinal grooves 29 that run longitudinally in the expansion webs 11. In this way, the sheet metal strips 19 forming the expansion elements 3 are mounted with their longitudinal ends, and only there, in the base body 2. In the pockets 28, the front longitudinal ends 12 are axially fixed to the base body 2 and are also rotationally fixed to the base body 2 about the longitudinal axis 5. On the other hand, pivoting around the crossbeam of the T-shaped, front section 14 and thus spreading outwards away from the longitudinal axis 5 is possible.At their rear longitudinal ends 13, however, the expansion elements 3 are held axially fixed in the longitudinal grooves 29 to the rear, i.e. under pressure, and are also held against rotation about the longitudinal axis 5 relative to the base body 2 and clamped.

[0051] The two expansion webs 11 are then folded together by pivoting them toward each other at the hinge 20. The collar 22 is arranged in one piece on one of the two expansion webs 11, to which the other of the expansion webs 11 positively engages in a locking connection device 27, so that the expansion webs 11 are connected to one another. The expansion anchor 1 is now ready for use. By folding them together, the two expansion elements 3 are captively mounted in the pockets 28 or the longitudinal grooves 29, both at their front longitudinal ends 12 and at their rear longitudinal ends 13, in the base body 2 of the expansion anchor 1.

[0052] The two spreading webs 11 are arranged opposite each other with respect to the longitudinal axis 5 and the spreading elements 3 are also arranged opposite each other with respect to the longitudinal axis 5, so that the spreading webs 11 are arranged in the circumferential direction between the spreading elements 3.

[0053] The two expansion elements 3 and the two expansion webs 11 of the expansion anchor 1 according to the invention are connected to one another only at their longitudinal ends via the base body 2 and can be easily pushed outwards away from the longitudinal axis 5 over their remaining length, i.e., spread open, when an expansion screw (not shown) is inserted between the expansion webs 11 and the expansion elements 3 into an expansion channel 30 formed there. Due to their mounting in the base body 2, the expansion elements 3 can be moved outwards relative to and independently of the expansion bodies 10 designed as expansion webs 11, so that the expansion region 9 exhibits very good expansion behavior and can adapt to a wide variety of situations and building materials.

[0054] The second embodiment of an expansion anchor 1 according to the invention, shown in Figures 3 to 6, is structurally similar to the first embodiment described above. In contrast to the first embodiment shown above, the base body 2 of the expansion anchor 1 is manufactured in one piece in an already closed state using an injection molding process, and the two metal expansion elements 3 are inserted laterally, radially to the longitudinal axis 5, into corresponding recesses 31 in the base body 2. One of the two expansion elements 3, which are designed as identical individual parts, is shown in detail in Figure 4. It differs from the expansion element 3 described in the first embodiment only in that the rear longitudinal end 13 is also bent or angled as a section 15, i.e., forms an angled, rear section 15.The rear section 15, like the front section 14, also has a T-shape; however, in this case the crossbeam is curved so that an expansion screw (not shown) can enter the expansion channel 30 without the crossbeam obstructing the screw. Figures 5 and 6 show how the angled sections 14, 15 engage in undercuts 32 formed in the base body 2, so that the angled sections 14, 15 are mounted there axially and rotationally fixed to the base body 2. In contrast, in this case too, the crossbeams of the T form linear bearings that lie in radial planes to the longitudinal axis 5 and about which the expansion elements 3 can pivot when expanded.

[0055] In the third embodiment of the expansion anchor 1 according to the invention, shown in Figures 7 to 9, the four metal expansion elements 3 in the embodiment each have connecting webs 16 at their front longitudinal ends 12, with which the expansion elements 3 are integrally connected to one another. Figure 9 shows a stamped and bent part consisting of the integrally connected expansion elements 3. The expansion elements 3 are connected to one another at their front longitudinal ends 12 by means of the connecting webs 16. The connecting webs 16 together form a bearing element 17 in the base body 2 of the expansion anchor 1. In the present case, the connecting webs 16 form an abutment 18 in the manner of a nut with a thread 33. As can be seen in Figure 7, this bearing element 17 lies in the base body 2 of the expansion anchor 1 and is held there in a rotationally fixed and axially fixed manner to the base body 2 by undercuts 32 into which the bearing element 17 engages in a form-fitting manner.The connecting webs 16, designed as abutments 18 or as threaded helices 33, enable the engagement of an expansion screw (not shown), which thereby finds good axial hold in the expansion anchor 1, which promotes the expansion of the expansion anchor 1. The rear longitudinal ends 13 of the expansion elements 3 are, as in the first embodiment, mounted in longitudinal grooves 29 in the base body 2. In this embodiment of the expansion anchor 1 according to the invention, two of the four expansion elements 3 rest flat against one another, whereby in this embodiment too, the expansion webs 11 made of plastic are arranged in the circumferential direction between the expansion elements 3 made of metal.

[0056] In all illustrated embodiments of the expansion anchor 1 according to the invention, the expansion elements 3 are mounted with their longitudinal ends 12, 13 in the base body 2 in such a way that they can be moved outwardly, relative to the base body 2 and independently of it. In particular, the expansion elements 3 are movable relative to and independently of the expansion bodies 10, which in the exemplary embodiments are formed by expansion webs 11. The expansion anchors 1 according to the invention can therefore be anchored securely and with high holding force in a wide variety of building materials and situations, for example, in solid building materials or in perforated bricks, here in the area of ​​walls or behind walls in cavities.

[0057] List of reference symbols

[0058] Expansion anchor Expansion anchor Base body Expansion element not occupied Longitudinal axis Direction of insertion Front end of expansion anchor 1 Rear end of expansion anchor 1 Expansion area Expansion body Expansion web Front longitudinal end of expansion element 3 Rear longitudinal end of expansion element 3 Front section Rear section Connecting web Bearing element Abutment Sheet metal strip Hinge Plastic cord Collar Web First tooth Yoke Second tooth Connecting device Pocket Longitudinal groove Expansion channel Recess Undercut Threaded helix

Claims

Claims 1. Expansion anchor (1), with a base body (2) made of plastic and at least one expansion element (3) made of metal, wherein the base body (2) extends along a longitudinal axis (5), in particular from a front end (7) of the expansion anchor (1) in the direction of insertion (6) to a rear end (8) of the expansion anchor (1), wherein the base body (2) has an expansion region (9), with an expansion body (10), in particular with an expansion web (11), wherein the expansion element (3) made of metal is arranged in the expansion region (9) and extends in the direction of the longitudinal axis (5), characterized in that the expansion element (3) made of metal is mounted with at least one of its longitudinal ends (12, 13) in the base body.

2. Expansion dowel (1) according to claim 1, characterized in that the expansion element (3) is mounted in such a way that it can be moved outwards relative to and independently of the expansion body (10).

3. Expansion dowel (1) according to one of the preceding claims, characterized in that the expansion element (3) is an elongated sheet metal strip (19).

4. Expansion dowel (1) according to one of the preceding claims, characterized in that the expansion element (3) has an angled section (14, 15) on at least one of its longitudinal ends (12, 13) which engages in the base body (2) for mounting.

5. Expansion dowel (1) according to claim 4, characterized in that the angled portion (14, 15) is T-shaped.

6. Expansion dowel (1) according to claim 5, characterized in that the expansion element (3) has at its two longitudinal ends (12, 13) an angled section (14, 15) which is T-shaped.

7. Expansion dowel (1) according to one of the preceding claims, characterized in that the base body (2) has at least two expansion bodies (10) made of plastic, designed as expansion webs (11), which are connected to one another at at least one of their longitudinal ends.

8. Expansion dowel (1) according to one of the preceding claims, characterized in that the expansion element (3) made of metal is connected to the base body (2) in a rotationally fixed manner in the circumferential direction at least at its rear longitudinal end (13).

9. Expansion dowel (1) according to one of the preceding claims, characterized in that the expansion dowel (1) has at least two expansion elements (3) made of metal which are not connected to one another.

10. Expansion dowel (1) according to one of the preceding claims, characterized in that the expansion dowel (1) has at least two expansion elements (3) made of metal, each of which has at least one connecting web (16) at one of its longitudinal ends (12), with which they are integrally connected to one another.

11. Expansion dowel (1) according to claim 10, characterized in that the two expansion elements (3) are connected to one another at their front longitudinal ends (12).

12. Expansion dowel (1) according to claim 10 or claim 11, characterized in that the connecting web (16) forms a bearing element (17) for the mounting of the expansion elements (3) in the base body (2).

13. Expansion dowel (1) according to one of claims 10 to 12, characterized in that the connecting web (16) forms an abutment (18) for an expansion screw.

14. Expansion dowel (1) according to one of the preceding claims, characterized in that the at least one expansion element (3) is mounted at its two longitudinal ends (12, 13) in the base body (2).

15. Expansion dowel (1) according to one of the preceding claims, characterized in that the expansion dowel (1) has a plurality of expansion webs (11) and a plurality of expansion elements (3), and that the expansion webs (11) are arranged in the circumferential direction between the expansion elements (3).

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