EXPANSION DOWEL

Description

[0001] The invention relates to an expansion anchor having the features of the preamble of claim 1.

[0002] European Patent EP 3 477 126 B1 discloses a metal-plastic expansion anchor comprising a hollow, bolt-shaped inner part made of plastic and a metal sleeve enclosing the inner part. The expansion anchor has an expansion cone with an internal thread at its front, which is drawn into the metal sleeve by screwing in an expansion screw, thus axially compressing the inner part. During compression, four expansion legs of the inner part bend radially outwards in a lever-like manner within a cavity of the building material, forming a kind of barb that holds the expansion anchor in the cavity by gripping from behind. Between each of the expansion legs of the inner part, the metal sleeve of the known expansion anchor has cantilever-shaped expansion legs, which the expansion cone pushes radially outwards, i.e., "expands," when it is drawn between the expansion legs.In a solid building material, the spread-out legs of the metal sleeve anchor the expansion anchor through positive locking and / or force locking.

[0003] The object of the invention is to propose an expansion anchor with at least one expansion leg made of plastic and at least one expansion leg made of metal, which has improved expansion behavior.

[0004] This problem is solved according to the invention by an expansion dowel having the features of claim 1.

[0005] The expansion anchor according to the invention, comprising the features of claim 1, has at least one first expansion leg made of plastic extending in a longitudinal direction of the expansion anchor and at least one second expansion leg made of metal extending in the longitudinal direction of the expansion anchor. The longitudinal direction extends parallel to a longitudinal axis of the expansion anchor, and the expansion legs may also extend obliquely at an acute angle to the longitudinal axis of the expansion anchor, i.e., with one component in the longitudinal direction of the expansion anchor. In the unexpanded state, the expansion legs preferably extend parallel to the longitudinal axis of the expansion anchor or at an angle of no more than 10°, 12°, or 15° to the longitudinal axis or to the longitudinal direction of the expansion anchor.The expansion legs have a length that is at least twice the nominal diameter of the expansion dowel, in particular a length that is at least 2.5 times and in particular at least three times the nominal diameter of the expansion dowel.

[0006] In particular, the expansion anchor according to the invention has two first expansion legs and / or two second expansion legs, which are arranged opposite each other with respect to the longitudinal axis of the expansion anchor. More than two first expansion legs and / or more than two second expansion legs, which are arranged evenly or unevenly distributed around the circumference of the expansion anchor, are also possible.

[0007] To expand the dowel according to the invention, the expansion legs are subjected to radial outward pressure, or at least to radial outward pressure, by inserting a preferably pin-shaped expansion element, such as a screw or a nail, along the longitudinal axis of the dowel. During expansion, the expansion legs are pivoted outward, for example, about a pivot axis tangential to the dowel or its longitudinal axis, at one end of each expansion leg, or, for example, subjected to pressure along their entire length, for example, parallel to the longitudinal axis of the dowel. This outward pressure on the expansion legs can be understood as expanding the expansion legs and expanding the dowel itself, the outer diameter of which increases in the area of ​​the expansion legs during expansion.

[0008] According to the invention, the at least one second metal expansion leg is flatter (thinner) in a circumferential direction relative to the longitudinal axis of the expansion anchor than it is wide in the radial direction relative to the longitudinal axis of the expansion anchor. This makes the at least one second metal expansion leg less stable in the circumferential direction than radially relative to the expansion anchor. This allows not only expansion radially or with a component radially away from the longitudinal axis, but also compression, i.e., shortening of the at least one metal expansion leg in the longitudinal direction of the expansion anchor. In particular, during compression, one end of the at least one second metal expansion leg rotates relative to another end of the at least one second metal expansion leg in the circumferential direction around the longitudinal axis of the expansion anchor, causing the at least one second expansion leg to wind around the longitudinal axis of the expansion anchor.In particular, the at least one second metal expansion leg – especially together with the at least one first plastic expansion leg and optionally further first and / or second expansion legs – forms a kind of knot. This knot formation, which occurs particularly in a cavity of a building material, can also be understood as a way of expanding the expansion anchor according to the invention. Compared to the buckling known from the prior art, knotting has the advantage that the expanded expansion legs adapt better to surfaces that define a cavity, for example on the back of a panel building material, such as a plasterboard, or behind a web in a hollow brick.

[0009] The dependent claims relate to advantageous embodiments and further developments of the invention specified in claim 1.

[0010] In the radial direction to the longitudinal axis of the expansion dowel, the at least one second expansion leg made of metal in embodiments of the invention is at least 1.5 times, in particular at least 1.7 times and preferably at least 2 times as wide as it is thick in the circumferential direction of the expansion dowel.

[0011] A preferred embodiment of the invention provides a screw engagement element at a front longitudinal end of the at least one second expansion leg made of metal. The front longitudinal end is an end of the at least one second expansion leg that is close to a front end of the expansion anchor. The "front end" of the expansion anchor is defined here as the end of the expansion anchor with which the expansion anchor is inserted into an anchor hole in a building material or, more generally, in an anchor base. The screw engagement element has, for example, an internal thread or a nut thread, or a circumferential section of an internal thread or nut thread with one or more threads for engagement with a screw thread of an expansion screw, which is inserted into the expansion anchor as a pin-shaped expansion element along the longitudinal axis of the expansion anchor.The screw engagement element at the front longitudinal end of the at least one second metal expansion leg need not have a slope; rather, its shape and arrangement must be suitable for engagement with the screw thread of the expansion screw. For example, if the expansion screw's head rests against the rear end of the expansion anchor, then, when the expansion screw is turned, the engagement of its screw thread with the screw engagement element at the front longitudinal end of the at least one second metal expansion leg causes the front longitudinal end of the at least one second expansion leg to move towards a rear longitudinal end of the at least one second metal expansion leg. This shortens the at least one second metal expansion leg in the longitudinal direction of the expansion anchor, i.e., compresses it or twists it about its longitudinal axis, causing the expansion anchor to expand.

[0012] One embodiment of the invention provides for two or more second expanding legs made of metal, the front and / or rear longitudinal ends of which are connected to one another. In particular, at least the front longitudinal ends are connected to one another in such a way that the front longitudinal ends of the second expanding legs can be moved together in the longitudinal direction of the expanding dowel and the second expanding legs can be compressed together.

[0013] Preferably, the front longitudinal ends of the second metal expansion legs are connected to each other by the screw engagement element. A preferred embodiment of the invention provides that the second metal expansion legs have webs at their front longitudinal ends which extend in an arc – with or without a pitch – around the longitudinal axis of the expansion anchor to serve as screw engagement elements for engagement with the screw thread of the expansion screw.

[0014] One embodiment of the invention provides for a sheet metal bending part having at least one second spreading leg made of metal. The second spreading leg(s) can be separated from the sheet metal, for example, by punching, laser cutting, or another method.

[0015] To improve the anchoring of the expansion anchor according to the invention in an anchor hole in a building material or, more generally, in an anchor base, the at least one second expansion leg made of metal, in embodiments of the invention, has barbs on a radially outer longitudinal edge, i.e., a longitudinal edge furthest from the longitudinal axis of the expansion anchor. The anchoring secures the expansion anchor, in particular the expanded expansion anchor, against being pulled out of the anchor hole.

[0016] For engagement with the screw thread of the expansion screw, one embodiment of the invention provides a rack-like contour on an inner longitudinal edge of at least one second expansion leg made of metal, i.e., the longitudinal edge facing the longitudinal axis of the expansion dowel.

[0017] To facilitate the spreading of the at least one first plastic spreader leg, embodiments of the invention feature recesses, cavities, indentations, perforations, or the like, which reduce its stiffness against bending, kinking, and / or twisting. "Twisting" refers to the winding of the at least one first plastic spreader leg around the longitudinal axis of the expansion anchor, as described above for the at least one second metal spreader leg, by rotating its front longitudinal end relative to its rear longitudinal end around the longitudinal axis of the expansion anchor. This twisting of the spreader leg(s) results in the spreader leg(s) forming a knot-like shape.

[0018] One embodiment of the invention provides for two second metal expansion legs arranged adjacent to each other circumferentially, i.e., without a first plastic expansion leg between them. In particular, they lie abutting each other circumferentially and touching each other. That is, these two adjacent second expansion legs are located at a circumferential point of the expansion anchor. The expansion anchor can have further second expansion legs at one or more other circumferential points, particularly opposite each other with respect to the longitudinal axis of the expansion anchor. Two adjacent metal expansion legs have the advantage over a single, thicker expansion leg in the circumferential direction that they are more easily bendable, for example, to more easily twist them to form the type of knot, i.e., to turn or wind them around the longitudinal axis of the expansion anchor.

[0019] The first plastic expansion legs are preferably arranged between second metal expansion legs in the circumferential direction of the expansion anchor. The first plastic expansion legs and the second metal expansion legs alternate in the circumferential direction of the expansion anchor.

[0020] To prevent the insert from rotating as a whole with the screw during spreading, which would hinder the spreading process, the metal insert is fixedly connected at least at its rear end to a base part on which the first spreading leg is formed in the plastic. The base part is, in particular, manufactured in one piece with the plastic spreading leg. Specifically, the insert is supported by the base part in both the circumferential and longitudinal directions. Specifically, the insert is also fixedly connected to the base part at its front and / or it is supported by the base part in the longitudinal direction.

[0021] 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 are possible that do not have all the features of the exemplary embodiments, but rather any part of the characterized features of an exemplary embodiment, possibly in combination with one, several, or all features of one or more further exemplary embodiments.

[0022] The invention is explained in more detail below with reference to two exemplary embodiments shown in the drawing. The drawing shows: Figure 1 is a perspective view of an expansion anchor according to the invention; Figure 2 is an axial section of the expansion anchor. Figure 1 Figure 3 shows a sheet metal bent part of the expansion dowel made from the Figures 1 and 2 in a perspective view; Figure 4 the expansion dowel from the Figures 1 and 2 in an expanded state; and Figure 5 a perspective view of a second embodiment of an expansion dowel according to the invention.

[0023] Basically, identical parts in the figures are assigned the same reference numbers.

[0024] The one in the Figures 1 and 2 The illustrated expansion dowel 1 according to the invention is a metal-plastic expansion dowel 1 with a base part 2 made of plastic and an insert part 3 made of metal.

[0025] The base part 2 has the shape of a typical plastic expansion anchor: Over most of its length, it has a cylindrical outer surface that tapers slightly at a front longitudinal end corresponding to the front end of the expansion anchor 1. The terms "front" and "rear" refer to the insertion direction of the expansion anchor 1 into an anchor hole (not shown). The "outer surface" is an imaginary enveloping surface of the base part 2. At a rear longitudinal end, the base part 2 has an end sleeve 19 with a radial flange 4. The base part 2 is penetrated from back to front by a coaxial screw channel 5, which tapers in a frustoconical shape at several points from back to front. Furthermore, the base part 2 has a longitudinal slot 6 in an axial plane of the base part 2, which extends from the end sleeve 19 over most of the length of the base part 2.The insert 3 is arranged in the longitudinal slot 6, and its rear ends 20 are supported in the longitudinal direction L and in the circumferential direction U on the end sleeve 19.

[0026] The longitudinal slot 6 terminates at the front at a short distance of approximately 1 to 5 mm from the front longitudinal end and at the rear at a greater distance, for example approximately 25 mm from the rear longitudinal end of the base part 2 at the end sleeve 19. The longitudinal slot 6 divides the plastic base part 2 of the expansion plug 1 according to the invention into two first plastic expansion legs 7, which extend in a longitudinal direction L of the expansion plug 1. The two first expansion legs 7 are opposite each other with respect to a longitudinal axis A of the expansion plug 1, which runs coaxially through the base part 2. The longitudinal direction L runs axially or parallel to the longitudinal axis A.

[0027] The in Figure 3The insert 3, shown as a separate component, is stamped, laser-cut, or otherwise separated from a sheet of metal. Other methods of manufacturing the insert 3 from metal are not excluded.

[0028] The insert 3 has two parallel strips which, in one plane of the insert 3, are approximately as wide as or slightly wider than the wall thickness of the base part 2 at their narrowest point, and have a maximum width of more than twice the wall thickness in the region of a second spreading leg 11. The wall thickness here corresponds to the sheet thickness. On either side of a longitudinal center 8, the two strips of the insert 3 are connected by one or more webs 9, which extend in an arc from one of the two parallel strips of the insert 3 to the other. In the illustrated and described embodiment of the invention, the insert 3 has three webs 9 on each side of its longitudinal center 8, which, in this embodiment, extend in a semicircular arc from one strip of the insert 3 to the other.All webs 9 are curved towards the same side of the plane of the insert 3, and in the exemplary embodiment the webs 9 have a slope, which, however, is not essential for the invention. The webs 9 form screw engagement elements 10 for (only) an . Figure 4 The illustrated expansion screw 17 can be screwed into the screw channel 5 to expand the expansion dowel 1.

[0029] In the exemplary embodiment, the two parallel strips of the insert 3 are not connected to each other in the longitudinal direction L outside the webs 9.

[0030] The insert 3 is bent 180° around its longitudinal center 8 such that its parallel strips lie against each other. The two strips are bent 180° around their longitudinal centers 8 so that the longitudinal halves of each strip lie against each other on both sides of the longitudinal centers 8. The longitudinal halves of each of the two strips of the insert 3, which is made of sheet metal, each form a second expansion leg 11, such that the expansion anchor 1 according to the invention has a total of four second expansion legs 11 made of metal. The second expansion legs 11 are connected to each other near their front longitudinal ends by the arcuate webs 9, which form the screw engagement elements 10. Two second expansion legs 11 lie against each other at any given time, and the two adjacent second expansion legs 11 are arranged opposite each other in pairs with respect to the longitudinal axis A of the expansion anchor 1 according to the invention.

[0031] The opposing sides of the adjacent second expansion legs 11 are located on the axial plane of the expansion dowel 1, in which the base part 2 of the expansion dowel 1 has the longitudinal slot 6 extending transversely through the base part 2 for the insert part 3.

[0032] The second spreading legs 11 have rectangular cross-sections, the width of which changes radially to the longitudinal axis A of the expansion dowel 1 along their length by means of rack-like contours 13 on inner longitudinal edges of the second spreading legs 11 and by means of barbs 14 on outer longitudinal edges of the second spreading legs 11, which are also explained below.

[0033] The sides of the second spreader legs 11 facing each other lie against each other.

[0034] Instead of inserting the insert 3 into the longitudinal slot 6 of the base part 2, i.e., for example, by sliding it in longitudinally from the front, the insert 3 can also be overmolded with the base part 2 in embodiments of the invention.

[0035] Because its webs 9 are bent in a semicircular arc and the insert 3 is bent 180° around its longitudinal center 8, the insert 3 can also be considered a sheet metal bent part. If the insert 3 is separated from the sheet metal by punching, the insert 3 can also be considered a sheet metal stamping and bending part.

[0036] The insert 3 is inserted into the longitudinal slot 6 of the plastic base 2 of the expansion anchor 1 according to the invention such that the second expansion legs 11, which are made of metal, are located in walls of the base 2 on both sides of the screw channel 5. The second expansion legs 11 run parallel to the longitudinal axis A of the expansion anchor 1 and at equal radial intervals from the longitudinal axis A of the expansion anchor 1, i.e., in the longitudinal direction L of the expansion anchor 1.

[0037] In the exemplary embodiment, the semicircular arc-shaped webs 9 are completed by bending the insert 3 at its longitudinal center 8 by 180° to form full circles that extend coaxially around the longitudinal axis A by 360° in a circumferential direction U. Due to the pitch of the semicircular arc-shaped webs 9, the webs 9 extend thread-like multiple times around the longitudinal axis A or around the screw channel 5. As described above, the webs 9, or all webs 9 together, form a screw engagement element 10 for the expansion screw 17. The webs 9, or the screw engagement element(s) 10, are located in a recess 12 at the front longitudinal end of the base part 2 of the expansion anchor 1.The recess 12 is open at the front longitudinal end of the base part 2 and on both sides of the base part 2 in an axial plane offset by 90° to the longitudinal slot 6 in which the insert part 3 or the second spreading legs 11 are arranged or are arranged, about the longitudinal axis A of the expansion dowel 1 or its base part 2.

[0038] The second expansion legs 11 are flatter in the circumferential direction U relative to the longitudinal axis A of the expansion anchor 1 than they are wide in a radial direction relative to the longitudinal axis A. In the exemplary embodiment, the sheet metal from which the insert 3, and thus also the second expansion legs 11, are made has a thickness of 0.8 mm, and the second expansion legs 11, which are made of metal, are approximately 2 mm wide in the axial plane of the expansion anchor 1 such that the second expansion legs 11 are more than twice as wide radially relative to the longitudinal axis A of the expansion anchor 1 as they are thick in the circumferential direction U.

[0039] In general, the second expansion legs 11 made of metal are radial to the longitudinal axis A of the expansion dowel 1 at least about 1.5 times, in particular at least about 1.7 times and preferably at least about 2 times as wide as they are in the circumferential direction U to the longitudinal axis A of the expansion dowel 1.

[0040] The inner longitudinal edges of the second, metal-made spreading legs 11 facing the screw channel 5 have rack-like contours 13 (see Figures 2 and 3), which project into the screw channel 5 for the engagement of a screw thread 18 of the expansion screw 17. In the exemplary embodiment, the rack-like contours 13 are offset by half a tooth in the longitudinal direction L with respect to the longitudinal axis A of the expansion anchor 1 opposite the second expansion leg 11, that is, in the longitudinal direction L of the expansion anchor 1, teeth of the rack-like contours 13 are located on the inner longitudinal edges of the second expansion leg 11 at the level of tooth gaps of the opposite rack-like contours 13.

[0041] The outer longitudinal edges of the second metal expansion legs 11, facing away from the screw channel 5, have sawtooth-shaped barbs 14 for better retention of the expansion dowel 1 in an anchor hole (not shown), which project radially outwards over a circumference of the base part 2 of the expansion dowel 1.

[0042] To reduce the resistance of the plastic first expansion legs 7 to twisting, and possibly also to buckling like a toggle or to outward spreading, the first expansion legs 7 have recesses 15 in the form of countersinks or through-holes. "Twisting" refers to a winding of the expansion legs 7, 11 in the circumferential direction U around the longitudinal axis A of the expansion anchor 1, which shortens the expansion legs 7, 11 axially to a fraction of their length and forms them into a kind of knot ( Figure 4 ).

[0043] To anchor the dowel in an anchor hole (not shown) in a base (not shown), the expansion dowel 1 according to the invention is inserted into the anchor hole with its tapered longitudinal end leading until the radial flange 4 at the rear longitudinal end of the expansion dowel 1 abuts the base. The anchor hole is preferably cylindrical, for example, it is drilled into the base. The expansion screw 17, which can also generally be considered a pin-shaped expansion element for expanding the expansion dowel 1, is then inserted from the rear longitudinal end into the screw channel 5 in the base 2 of the expansion dowel 1 and screwed in.When screwed in, the screw thread 18 of the expanding screw 17 engages with the inner circumferential sides of the first expanding legs 7, which are made of plastic and face the screw channel 5, into which the screw thread 18 of the expanding screw 17 cuts, and the screw thread 18 of the expanding screw 17 engages with the rack-like contours 13 on the inner longitudinal edges of the second expanding legs 11, which are made of metal and which help to axially draw the expanding screw 17 into the screw channel 5.

[0044] In a solid building material such as concrete as the anchor base, the expansion screw 17 expands the first and second expansion legs 7, 11. This means the expansion screw 17 pushes the expansion legs 7, 11 radially outwards away from the longitudinal axis A of the expansion anchor 1 and against the wall of the anchor hole (not shown). Pressing the expansion legs 7, 11 against the wall of the anchor hole creates a frictional connection and, if necessary, an additional positive connection between the expanded first and second expansion legs 7, 11 of the expansion anchor 1 and the wall of the anchor hole. This anchors the expansion anchor 1 in the anchor hole, preventing it from being pulled out. The barbs 14 on the outer longitudinal edges of the second expansion legs 11 further improve the hold of the expansion anchor 1 in the anchor hole.

[0045] If the expansion anchor 1 is inserted into an anchor hole in a hollow building material such as a perforated brick as the anchor base, and the expansion legs 7, 11 are located in a cavity of the anchor base, the expansion screw 17, when screwed in, pulls axially towards the rear longitudinal end of the expansion anchor 1 between the arc-shaped webs 9 forming the screw engagement element(s) 10 at the front longitudinal ends of the second, metal expansion legs 11, as soon as a head of the expansion screw 17 (in Figure 4(concealed) presses against the radial flange. The metal insert 3 is fixedly connected to the base part 2 at its rear end 20, preventing the entire insert 3 from rotating with the expanding screw 17. Furthermore, the insert is supported longitudinally L to the rear against the end sleeve 19 of the base part 2. This means that the front longitudinal ends of the second metal expanding legs 11 are moved towards their rear longitudinal ends 20. Turning the expanding screw 17 rotates the front longitudinal ends of the second expanding legs 11 around the expanding screw 17, while the rear longitudinal ends 20 of the second expanding legs 11 do not rotate.In this process, the first and second expansion legs 7, 11 are twisted, that is, they are wound around the expansion screw 17 and thus around the longitudinal axis A of the expansion dowel 1, whereby the expansion legs 7, 11 shorten axially to a fraction of their original length and form a kind of knot 16, which in . Figure 4 The node 16 engages the cavity in the hollow building material as an anchor base and thereby anchors the expansion anchor 1 in the cavity by positive locking. Additionally, a force-fit connection is achieved by the expansion of the expansion legs 7, 11 outside the cavity, for example, in webs of the hollow building material.

[0046] The in Figure 5 The second embodiment of an expansion dowel 1 according to the invention, as illustrated, differs from the one shown in Figures 1 and 2The expansion dowel 1 according to the invention is characterized in that the second expansion legs 11, which are made of metal, do not abut each other in a longitudinal central section, but rather have a distance a in the circumferential direction U to the longitudinal axis A of the expansion dowel 1. The second expansion legs 11 are thus also adjacent. The distance a is, for example, approximately one or more millimeters. The longitudinal central section in which the second expansion legs 11 have the distance a from each other in the circumferential direction U extends, for example, over approximately 70% to 80% of the total length of the expansion leg 11. In longitudinal end sections adjoining the longitudinal ends, the second expansion legs 11 abut each other in the exemplary embodiment.

[0047] Incidentally, the one in Figure 5 The illustrated expansion dowel 1 according to the invention is designed in the same way as the one shown in the Figures 1, 2 and 4The illustrated expansion dowel 1, so that to avoid repetition, the explanation of the in Figure 5 The illustrated expansion dowel 1 supplements the explanations of the Figures 1 to 4 can be referred. Reference symbol list Expansion dowel

[0048] A Longitudinal axis L Longitudinal direction U Circumferential direction a Spacing 1 Expansion dowel 2 Base part 3 Insert part 4 Radial flange 5 Screw channel 6 Longitudinal slot 7 First expansion leg 8 Longitudinal center of the insert part 3 9 Web 10 Screw engagement element 11 Second expansion leg 12 Recess 13 Rack-like contour 14 Barb 15 Recess 16 Knot 17 Expansion screw 18 Screw thread 19 End sleeve of the base part 2 20 Rear end of the insert part 3 or of a second expansion leg 11

Claims

1. Expansion dowel (1), having a longitudinal axis (A), having at least one first expansion leg (7) made of plastic extending in a longitudinal direction (L) of the expansion dowel (1), and having at least one second expansion leg (11) made of metal extending in the longitudinal direction (L) of the expansion dowel (1), wherein the at least one first expansion leg (7) and the at least one second expansion leg (11) are movable outward, in particular radially relative to the longitudinal axis (A), by introducing a preferably pin-shaped expansion element along the longitudinal axis (A) into the expansion dowel (1), characterized in that the second expansion leg (11) is flatter in a circumferential direction (U) relative to the longitudinal axis (A) of the expansion dowel (1) than it is wide in the radial direction relative to the longitudinal axis (A) of the expansion dowel (1).

2. Expansion dowel (1) according to claim 1, characterized in that the at least one second expansion leg (11) is at least 1.5 times, in particular at least 1.7 times, and preferably at least 2 times as wide in the radial direction relative to the longitudinal axis (A) of the expansion dowel (1) as it is thick in the circumferential direction (U) relative to the longitudinal axis (A) of the expansion dowel (1).

3. Expansion dowel (1) according to claim 1 or 2, characterized in that a screw engagement element (10) for engagement of a screw thread (18) of an expansion screw (17) introduced along the longitudinal axis (A) of the expansion dowel (1) into the expansion dowel (1) as a pin-shaped expansion element is arranged at a front longitudinal end of the second expansion leg (11).

4. Expansion dowel (1) according to one or more of claims 1 to 3, characterized in that the expansion dowel (1) has at least two second expansion legs (11) made of metal, and that front longitudinal ends and / or rear longitudinal ends of the two second expansion legs (11) are connected.

5. Expansion dowel (1) according to claim 4, characterized in that the front longitudinal ends of the second expansion legs (11) are connected to one another by the screw engagement element (10).

6. Expansion dowel (1) according to claim 4 or 5, characterized in that the front longitudinal ends of the second expansion legs (11) are connected by webs (9) which extend in an arc shape around the longitudinal axis (A) of the expansion dowel (1) and which form the screw engagement element (10).

7. Expansion dowel (1) according to one or more of the preceding claims, characterized in that the expansion dowel (1) has a bent sheet metal part which has the at least one second expansion leg (11).

8. Expansion dowel (1) according to one or more of the preceding claims, characterized in that the at least one second expansion leg (11) has barbs (14) on its radially outer longitudinal edge.

9. Expansion dowel (1) according to one or more of the preceding claims, characterized in that a radially inner longitudinal edge of the at least one second expansion leg (11) made of metal has a rack-like contour (13) for engagement with the screw thread (18) of the expansion screw (17).

10. Expansion dowel (1) according to one or more of the preceding claims, characterized in that the at least one first expansion leg (7) has recesses (15) which reduce a stiffness of the at least one first expansion leg (7) against expansion, against buckling, and / or against torsion.

11. Expansion dowel (1) according to one or more of the preceding claims, characterized in that the expansion dowel (1) has two second expansion legs (11) made of metal which are arranged adjacently in the circumferential direction (U), in particular they abut one another in the circumferential direction (U).

12. Expansion dowel (1) according to one or more of the preceding claims, characterized in that the expansion dowel (1) has exactly two first expansion legs (7) made of plastic and / or exactly two second expansion legs (11) made of metal which are opposite one another with respect to the longitudinal axis (L) of the expansion dowel (1).

13. Expansion dowel (1) according to one or more of the preceding claims, characterized in that the first expansion legs (7) made of plastic are arranged in the circumferential direction (U) of the expansion dowel (1) between the second expansion legs (11) made of metal.

14. Expansion dowel (1) according to one or more of the preceding claims, characterized in that the second expansion leg (11) made of metal is connected in a rotationally fixed manner at least at its rear end (20) to a base part (2) on which the first expansion leg (7) made of plastic is formed.