阅读说明：本技术 具有带凹槽锚栓的膨胀锚 (Expansion anchor with anchor bolt with groove ) 是由 岛原英己 于 2019-10-07 设计创作，主要内容包括：本发明涉及一种膨胀锚,所述膨胀锚包括锚栓和至少一个膨胀壳,其中所述锚栓包括：用于使所述至少一个膨胀壳膨胀的楔形区域；容纳至少一部分所述膨胀壳的颈部区域,所述颈部区域位于所述楔形区域的后方；形成用于所述膨胀壳的向后止动件的邻接区域,所述邻接区域位于所述颈部区域的后方；中间区域,所述中间区域位于所述邻接区域的后方；和后部区域,用于将拉力引入到所述锚栓中,所述后部区域位于所述中间区域的后方,其中所述锚栓在所述颈部区域内设有至少一个纵向延伸的颈部区域凹槽,且其中所述锚栓在所述中间区域内设有至少一个纵向延伸的中间区域凹槽。(The invention relates to an expansion anchor comprising an anchor bolt and at least one expansion shell, wherein the anchor bolt comprises: a wedge-shaped region for expanding the at least one expansion shell; a neck region containing at least a portion of the expansion shell, the neck region being located rearwardly of the wedge region; an abutment region forming a rearward stop for the expansion shell, the abutment region being rearward of the neck region; a middle region located rearward of the adjoining region; and a rear region for introducing tension into the anchor bolt, the rear region being located behind the middle region, wherein the anchor bolt is in the neck region is provided with at least one longitudinally extending neck region groove, and wherein the anchor bolt is provided with at least one longitudinally extending middle region groove in the middle region.)

1. An expansion anchor, comprising:

-an anchor bolt (10), and

-at least one expansion shell (30) located at the anchor bolt (10),

-wherein the anchor bolt (10) comprises

-a wedge-shaped area (12) for expanding the at least one expansion shell (30),

-a neck region (13) accommodating at least a part of the expansion shell (30), the neck region (13) being located behind the wedge region (12),

-an abutment region (14) forming a rearward stop for the expansion shell (30), the abutment region (14) being located rearward of the neck region (13),

-an intermediate zone (15), said intermediate zone (15) being located behind said abutment zone (14), and

a rear region (17) for introducing a tensile force into the anchor bolt (10), the rear region (17) being located behind the central region (15),

-wherein the anchor bolt (10) is provided with at least one longitudinally extending neck region groove (23) in the neck region (13),

the expansion anchor is characterized in that it is,

-the anchor bolt (10) is provided with at least one longitudinally extending intermediate zone groove (25) in the intermediate zone (15).

2. The expansion anchor according to claim 1,

it is characterized in that the preparation method is characterized in that,

the at least one middle region groove (25) is aligned with the at least one neck region groove (23).

3. The expansion anchor according to any one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

the at least one neck region groove (23) spans the entire neck region (13) and/or the at least one intermediate region groove (25) spans the entire intermediate region (15).

4. The expansion anchor according to any one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

the length of the intermediate region (15) is greater than the length of the abutment region (14) and/or the length of the neck region (13) is greater than the length of the abutment region (14).

5. The expansion anchor according to any one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

the neck region (13) and the intermediate region (15) have the same length.

6. The expansion anchor according to any one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

the intermediate region (15) and the neck region (13) have the same minimum radius (r) and/or the same maximum radius (r).

7. The expansion anchor according to any one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

the intermediate region (15) and the neck region (13) are at least partially mirror-symmetrical.

8. The expansion anchor according to any one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

-the anchor bolt (10) is provided with a plurality of longitudinally extending neck region grooves (23) in the neck region (13), and

-the anchor bolt (10) is provided with a plurality of longitudinally extending intermediate zone grooves (25) in the intermediate zone (15).

9. The expansion anchor according to claim 8,

it is characterized in that the preparation method is characterized in that,

the number of neck region grooves (23) is equal to the number of middle region grooves (25).

10. The expansion anchor according to any one of claims 8 or 9,

it is characterized in that the preparation method is characterized in that,

each of the plurality of neck region grooves (23) is aligned with one of the plurality of middle region grooves (25).

11. The expansion anchor according to any one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

in the abutment region (14), the anchor bolt (10) comprises an abutment ring which projects radially on the anchor bolt (10).

12. The expansion anchor according to any one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

the at least one expansion shell (30) engages into the at least neck region groove (23).

13. The expansion anchor according to any one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

the expansion shell (30) is an expansion sleeve which surrounds the anchor bolt (10).

14. The expansion anchor according to any one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

in the rear region (17), the anchor bolt (10) comprises an external thread.

15. Method for manufacturing an expansion anchor according to any one of the preceding claims, wherein the anchor bolt (10) of the expansion anchor is formed using a cross-wedge rolling step.

Technical Field

The present invention relates to an expansion anchor according to the preamble of claim 1. Such an expansion anchor comprises an anchor bolt and at least one expansion shell located on the anchor bolt, wherein the anchor bolt comprises: a wedge-shaped region for expanding the at least one expansion shell; a neck region containing at least a portion of the expansion shell, the neck region being located rearwardly of the wedge region; an abutment region forming a rearward stop for the expansion shell, the abutment region being rearward of the neck region; a middle region located rearward of the adjoining region; and a rear region for introducing a tensile force into the anchor bolt, said rear region being located behind the intermediate region, wherein the anchor bolt is provided with at least one longitudinally extending neck region recess in the neck region.

Background

EP2848825a1 discloses a expansion anchor according to the preamble of claim 1. In EP2848825a1, the expansion sleeve has at least one web on its inner side, which engages in a groove provided in the neck region of the anchor bolt. During installation, the web is displaced radially outwards by the wedge-shaped region of the anchor bolt, i.e. the material of the web is initiated to produce a particularly wide expansion.

DE2256822a1 shows an expansion anchor in which a rotation lock is provided between the expansion sleeve and the anchor bolt. The rotation lock can be formed by a recess in the neck region of the anchor bolt and a corresponding projection projecting from the expansion sleeve.

EP0515916a2 and DE3411285a1 describe fasteners. In both cases, the sleeve is interlocked with the inner bolt by means of a thread.

WO17067945a1 describes a method of anchoring an expansion anchor in a hole. The expansion anchor is first expanded and the space between the wall of the hole and the anchor is then filled with a hardenable substance so that the hardenable substance reaches the adjacent region of the anchor.

Disclosure of Invention

It is an object of the present invention to provide an expansion anchor which, while providing good and reliable performance, can be manufactured particularly easily and with particularly low costs and efforts, and which can also provide additional functionality.

This object is achieved by an expansion anchor according to claim 1. The dependent claims refer to preferred embodiments of the invention.

According to the invention, the anchor bolt is provided with at least one longitudinally extending intermediate-region recess in the intermediate region.

The invention therefore proposes to provide the neck region, i.e. the region directly in front of the abutment region, and the intermediate region, i.e. the region directly behind the abutment region, both with a grooved structure.

The at least one neck region groove provided in the neck region may functionally interact with an adjacent expansion shell, for example, to provide a rotational interlock, or to accommodate expansion shell material to be radially displaced by the wedge region when the anchor is loaded. The present invention has found that it may be advantageous to provide the intermediate region with at least one recess, i.e. an intermediate region recess, even in the event that the expansion shell is axially spaced from the intermediate region, so that direct interaction with the expansion shell is not possible. First, this allows for a reduction in the amount of material required to manufacture the anchor. Furthermore, the resulting anchor bolt design can be particularly symmetrical, which can be advantageous from a manufacturing point of view, in particular when wedge cross-rolling is used, due to the distribution of the forces generated. These advantages can be achieved without negatively affecting the performance of the anchor: since the neck region must accommodate the expansion shell, the neck region must generally have a minimum cross-section. However, since the neck region is provided with a groove structure, the intermediate region can also be provided with a groove structure without further weakening the anchor bolt and affecting the overall anchoring performance. In addition, the intermediate zone groove of the present invention may facilitate material transport in such applications where hardenable substances are inserted into the holes.

The anchor is an elongated body. The expansion shell is adjacent to the anchor bolt, so that for anchoring the expansion anchor, the expansion shell can be displaced radially when the anchor bolt is loaded in the rearward direction.

Preferably, the wedge-shaped region, the neck region, the abutment region, the intermediate region and the rear region of the anchor bolt are integral, which simplifies manufacture and improves performance. The wedge region, the neck region, the abutment region, the intermediate region and the rear region are non-overlapping, i.e. separated, in the axial direction. In particular, the wedge region is adjacent to the neck region, the neck region is adjacent to the abutment region, and/or the abutment region is adjacent to the intermediate region. The intermediate region may be adjacent to the rear region, or there may be a raised region or another region between the intermediate region and the rear region.

The anchor bolt defines a longitudinal axis, which may advantageously also be the longitudinal axis of the expansion anchor. By general definition, the "longitudinal axis" can be in particular a shaft extending in the longitudinal direction, i.e. a shaft extending in the length direction of the anchor bolt. When the terms "radially," "axially," "longitudinally," "circumferentially," "forwardly," "rearwardly," and the like are used, these terms should be understood with respect to the longitudinal axis of the anchor bolt in particular.

In the wedge region, the anchor bolt forms a wedge for the expansion shell, which converges toward the rear of the anchor bolt, so that the wedge region can displace the expansion shell radially when the anchor bolt is loaded in the rearward direction. For example, the anchor can be conical in the wedge-shaped region. However, more complex converging designs involving, for example, grooved axial wedge area channels extending in the wedge area may be particularly preferred.

The neck region is axially between the wedge region and the abutment region. At least a part of the expansion shell, preferably a significant part of the expansion shell, overlaps the neck region in the axial direction at least before the expansion anchor is installed. The neck region thus at least partially accommodates the expansion shell. In the neck region, the anchor bolt is preferably cylindrical, in particular with a non-circular base, wherein the non-circularity is caused at least by the neck region recess.

In the adjoining region, the anchor bolt has a shape which prevents a rearward movement of the expansion shell relative to the anchor bolt. Thus, when the anchor bolt is inserted into the hole, the abutment region can advance the expansion shell into the hole. In particular, the anchor bolt can have a greater maximum diameter and/or maximum radius in the adjoining region when compared to the neck region and preferably also compared to the intermediate region.

The intermediate region connects the abutment region with the rear region, i.e. it is located between the abutment region and the rear region. In the intermediate region, the anchor bolt is preferably cylindrical, in particular with a non-circular base, wherein the non-circularity is caused at least by the intermediate region recess. As mentioned above, the expansion shell may be axially spaced from the intermediate region.

The rear region serves for introducing a tensile force directed backwards into the anchor bolt, i.e. for loading the anchor. Preferably, the anchor bolt has a thread in the rear region, in particular in the entire region, wherein the thread allows the transmission of forces. The rear region is therefore preferably a threaded region, in particular an externally threaded region. However, in an alternative embodiment, the anchor can also have a larger diameter head in the rear region, which is particularly preferred for low-load applications.

In particular, the threads of the rear region do not extend to the middle region, i.e. the threads of the rear region are remote from the middle region. In particular, the intermediate region and/or the neck region are unthreaded.

The neck region recess extends in particular parallel to the longitudinal axis of the anchor bolt. In particular, the long axis of the recess of the neck region extends parallel to the longitudinal axis of the anchor bolt. The neck region recess is not threaded and preferably the neck region is unthreaded. Preferably, the sides of the recess of the neck region extend parallel to the longitudinal axis of the anchor bolt. The neck region groove is provided on the side surface of the anchor bolt, i.e. the neck region groove forms a depression in the side surface of the anchor bolt.

The central-region recess extends in particular parallel to the longitudinal axis of the anchor bolt. In particular, the long axis of the recess of the middle region extends parallel to the longitudinal axis of the anchor bolt. The intermediate region groove is not threaded and preferably the intermediate region is unthreaded. Preferably, the lateral surfaces of the recess of the central region extend parallel to the longitudinal axis of the anchor bolt. The intermediate-zone groove is provided on the side surface of the anchor bolt, i.e. the intermediate-zone groove forms a depression in the side surface of the anchor bolt.

In particular, the neck region groove and the middle region groove each have a long extension, and this long extension extends in the longitudinal direction, i.e. parallel to the longitudinal axis.

Preferably, the anchor bolt and/or the expansion shell are each steel parts. For example, the steel parts may comprise carbon steel or stainless steel.

According to a preferred embodiment of the invention, the at least one intermediate region groove is aligned with the at least one neck region groove. In other words, the middle region groove is located in a virtual extension of the neck region groove. More preferably, there is no circumferential offset between the middle region groove and the neck region groove. This may further improve the symmetry of the forces and facilitate manufacturing.

It is particularly advantageous if the at least one neck region groove spans the entire neck region and/or the at least one intermediate region groove spans the entire intermediate region. This may further reduce material requirements and improve functionality. In particular, the at least one neck region groove may extend to the wedge region and the at least one intermediate region groove may extend to the bulge region.

Preferably, the length of the intermediate region is greater than the length of the abutment region and/or the length of the neck region is greater than the length of the abutment region, which may further simplify manufacturing and/or improve performance. Accordingly, the length of the at least one intermediate region groove is preferably greater than the length of the abutment region, and/or the length of the at least one neck region groove is preferably greater than the length of the abutment region. It is particularly advantageous if the at least one middle region groove and the at least one neck region groove have the same length. In particular, the length may be considered to be a longitudinal extension.

Preferably, the length of the intermediate region in the axial direction is at least twice, more preferably at least three times, that of the adjoining region. It is particularly useful if the neck region and the intermediate region have the same length. This may further increase symmetry due to the symmetry of forces generated during manufacturing and operation, and higher symmetry may further improve manufacturing process and performance.

Advantageously, the middle region and the neck region have the same minimum radius r and/or the same maximum radius r. Alternatively or additionally, the intermediate region and the neck region preferably have the same minimum diameter d and/or the same maximum diameter d. Both allow a further reduction of the material requirements.

According to a further preferred embodiment of the invention, the intermediate region and the neck region are at least partially mirror-symmetrical, in particular with respect to a plane of symmetry perpendicular to the longitudinal axis and/or across the intermediate region. This highly symmetrical arrangement may further improve manufacturing process and performance and reduce the amount of material required due to the symmetry of forces generated during manufacture and operation. These two regions can only be partially mirror-symmetrical, which means that they can have mirror-symmetrical regions, while the other regions are not. Preferably, the two regions are mirror-symmetrical at least in the axially and circumferentially extending regions. The entire area may also be mirror symmetric.

Advantageously, the anchor bolt is provided with a plurality of longitudinally extending neck region recesses in the neck region and a plurality of longitudinally extending intermediate region recesses in the intermediate region. Having multiple grooves may increase the advantage of a single groove. In this context, reference is repeatedly made to the properties of the individual neck region grooves. However, if a plurality of neck region grooves are present, at least one of the plurality of neck region grooves may have these characteristics, or all of the plurality of neck region grooves may have these characteristics, unless explicitly stated otherwise. Also, in this context, reference is repeatedly made to the properties of a single intermediate region groove. However, if there are a plurality of intermediate region grooves, at least one of the plurality of intermediate region grooves may have these characteristics, or all of the plurality of intermediate region grooves may have these characteristics, unless otherwise specifically stated.

Preferably, the number of neck region grooves is equal to the number of intermediate region grooves and/or each of the plurality of neck region grooves is aligned with one of the plurality of intermediate region grooves. The resulting higher symmetry may further improve manufacturing and performance due to the symmetry of forces generated during manufacturing and operation.

In the abutment region, the anchor bolt preferably comprises an abutment ring which projects radially on the anchor bolt, in particular with respect to both the neck region and the intermediate region. This abutment ring may form a forward facing annular shoulder, which allows a particularly effective engagement of the expansion shells, while being easy to manufacture in the device of the invention. The abutment ring surrounds the longitudinal axis of the anchor bolt. It projects radially on the anchor bolt, i.e. radially around it, in particular radially on the neck region and the central region. The rear region is separated from the adjoining ring by the intermediate region and the raised region, if present. In particular, the abutment ring may define the length, i.e. the longitudinal extension, of the abutment region, i.e. the length of the abutment region is equal to the length of the abutment ring. Preferably, the abutment ring is an abutment region.

Preferably, said at least one expansion shell engages into said at least neck region recess. With this arrangement, the neck region recess may contribute to the anchoring function, for example by accommodating the material to be expanded or by contributing to the rotation of the lock.

Conveniently, the expansion shell is an expansion sleeve surrounding the anchor bolt. This is particularly efficient and easy to manufacture.

As mentioned above, in the rear region, the anchor bolt preferably comprises an external thread. This facilitates the manufacture while achieving a particularly efficient force transmission. A nut may be screwed onto the thread.

The present invention also encompasses a method of manufacturing the expansion anchor used in the present invention, wherein the anchor bolt of the expansion anchor is formed using a cross wedge rolling step. The design of the present invention can facilitate cross wedge rolling due to its high symmetry. In particular, the at least one neck region groove and the at least one intermediate region groove may be formed in a cross-wedge rolling step process.

Features described herein in connection with the expandable anchor of the present invention may also be used in connection with the method of the present invention, and features described herein in connection with the method of the present invention may also be used in connection with the expandable anchor of the present invention.

Drawings

The invention is explained in more detail below with reference to preferred exemplary embodiments, which are schematically depicted in the drawings. The various features of the exemplary embodiments presented below may be implemented individually or in any combination within the scope of the present invention.

FIG. 1 is a perspective view of an embodiment of the expansion anchor of the present invention;

FIG. 2 is a perspective view of only the anchor of the expansion anchor of FIG. 1;

FIG. 3 is a side elevational view of only the anchor of the expansion anchor of FIG. 1;

FIG. 4 is a cross-section 4-4 according to FIG. 3 of the anchor bolt of the expansion anchor of FIG. 1 only;

FIG. 5 is a cross-section 5-5 according to FIG. 3 of the anchor bolt of the expansion anchor of FIG. 1 only; and

fig. 6 shows the anchor of fig. 1 in a longitudinal cross-sectional view in a hole in a substrate.

Detailed Description

The drawings illustrate one embodiment of the expansion anchor of the present invention. The illustrated expansion anchor is of the stud-type and has an elongated anchor bolt 10 defining a longitudinal axis 99, and an expansion shell 30 disposed adjacent the anchor bolt 10 in an anterior region or point region of the anchor bolt 10. In the present exemplary embodiment, the expansion shell 30 is an expansion sleeve which surrounds the anchor bolt 10.

The anchor bolt 10 has a wedge-shaped region 12 in its front or tip region, said wedge-shaped region 12 being designed to radially expand the expansion shell 30 when the wedge-shaped region 12 is pulled into the expansion shell 30 in the rearward direction, i.e. when the expansion shell 30 is moved forward relative to the wedge-shaped region 12 onto the wedge-shaped region 12. To this end, at least before the anchor is installed, the side surfaces of the anchor bolt 10 converge in the wedge-shaped region 12 towards the rear of the anchor bolt 10, i.e. towards the expansion shell 30. Preferably, the focus of the convergence is on the longitudinal axis 99.

In the present case, the anchor bolt 10 also has a transition region 42, which is located in front of the wedge region 12 and adjacent to the wedge region 12, and a tip region 41, which is located in front of the transition region 42 and adjacent to the transition region 42. In the transition region 42, the backward convergence is smaller, or even zero, compared to the wedge region 12, but preferably is non-backward convergence, i.e. not forward convergence. In this example, there is no convergence, i.e. zero, in the transition region 42. In the tip region 41, the side surfaces of the anchor bolt 10 converge towards the front end of the anchor.

The anchor bolt 10 has a neck region 13 adjacent the wedge region 12 and behind the wedge region 12. An expansion shell 30 at least partially surrounds the neck region 13 at least prior to installation of the anchor.

At the rearward end of the neck region 13, the anchor bolt 10 has an abutment region 14, wherein the anchor bolt 10 includes an abutment ring which projects radially above the anchor bolt 10 and forms a forwardly facing annular shoulder for axially engaging the expansion shell 30 and advancing the expansion shell 30.

In the present case, the wedge region 12 and the neck region 13 are, for example, integral with the remaining anchor bolt 10. However, a multi-piece design of the anchor bolt 10 is also possible.

In the rear region of the anchor bolt 10, the anchor bolt 10 has a rear region 17, characterized in that the anchor bolt 10 is provided with an external thread in the rear region 17. The external threads provide a load introducing structure for introducing a rearwardly directed load to the anchor bolt 10.

The anchor bolt 10 has an intermediate region 15 axially between the rear region 17 and the adjacent region 14, wherein the maximum diameter d of the anchor bolt 10 is smaller than in the rear region 17 and/or the adjacent region 14. The rear region 17 is adjacent to the abutment region 14 and may be adjacent to the rear region 17. In the present case, however, the anchor bolt 10 also has a raised region 16 located axially between the intermediate region 15 and the rear region 17. The raised region 16 is adjacent the intermediate region 15 and the rear region 17. The neck region 13 and the intermediate region 15 have the same length. The distance from the wedge region 12 to the abutment region 14 and the distance from the raised region 16 to the abutment region 14 are the same.

The raised region 16 projects radially above the anchor bolt 10. In the convex region 16, the anchor bolt 10 has a greater maximum radius r, measured from the longitudinal axis 99, than in the middle region 15 and the rear region 17. Preferably, in the raised area 16, the anchor bolt 10 also has a larger maximum diameter d than in the intermediate area 15 and the rear area 17. Thus, the raised area 16 forms a ring around the longitudinal axis 99, which protrudes with respect to its circumference. When the anchor is radially loaded, the raised region 16 may abut the bore wall, allowing force to be transmitted to the substrate and protecting the expansion mechanism provided by the wedge region 12 and expansion shell 30.

As can be seen particularly clearly in fig. 6, in the convex region 16, the anchor bolt 10 preferably has a greater maximum radius r, preferably also a greater maximum diameter d than in the abutment region 14, more preferably also a greater maximum radius r, and preferably also a greater maximum diameter d than in the wedge region 12. This results in a particularly high support in the holes of the substrate 6. The radius r is measured in each case starting from the longitudinal axis 99 and the diameter d through the longitudinal axis 99.

The expansion shell 30 is provided with a plurality of slits 36 that start from the front end of the expansion shell 30 and extend toward the rear end of the expansion shell 30. The slits 36 may facilitate radial expansion of the expansion shell 30.

In the neck region 13, the anchor bolt 10 is provided on its side surface with a plurality of neck region grooves 23. These neck region recesses 23 are radially accessible from the outside of the anchor bolt 10. The neck region grooves 23 are each longitudinal grooves extending parallel to the longitudinal axis 99. In cross section, the neck region 13 deviates from a circle at the neck region groove 23. The neck region groove 23 extends into the wedge region 12 along the entire neck region 13. The neck region 13 is unthreaded.

Each neck region groove 23 has a first neck region groove sidewall and a second neck region groove sidewall, wherein the two neck region groove sidewalls circumferentially bound the respective neck region groove 23. Thus, the neck region groove sidewall is a circumferential sidewall. In fig. 2, a first neck region groove sidewall of the exemplary neck region groove 23 has been labeled with reference numeral 71, and a second neck region groove sidewall of the exemplary neck region groove 23 has been labeled with reference numeral 72.

The intermediate region 15 is unthreaded. In the middle region 15, however, the anchor bolt 10 is provided on its side surfaces with a plurality of middle region grooves 25. These intermediate-zone recesses 25 are radially accessible from the outside of the anchor bolt 10. The intermediate region grooves 25 are each longitudinal grooves extending parallel to the longitudinal axis 99. In cross section, the middle region 15 deviates from a circle at the middle region groove 25. The middle region groove 25 extends into the raised region 16 along the entire middle region 15.

Each middle region groove 25 has a first middle region groove sidewall and a second middle region groove sidewall. The two middle region groove sidewalls circumferentialiy bound the respective middle region groove 25. Thus, the mid-region groove sidewall is a circumferential sidewall. In fig. 2, a first middle region groove sidewall of an exemplary middle region groove 25 has been labeled with reference numeral 73, and a second middle region groove sidewall of the exemplary middle region groove 25 has been labeled with reference numeral 74.

Each of the intermediate region grooves 25 overlaps with one of the neck region grooves 23 in the radial and circumferential directions. The intermediate region groove 25 and the neck region groove 23 are aligned such that the intermediate region groove 25 forms an extension of the neck region groove 23.

The expansion shell 30 engages in the neck region recess 23. For this purpose, the expansion shell has an axially extending thickening which projects into the neck region recess 23. This engagement can form a rotational lock that prevents the expansion shell 30 from rotating about the anchor bolt 10.

The raised region 16 is provided with a raised region channel 26 that extends longitudinally through the raised region 16. In the present case, the raised area channels 26 are surface grooves. Raised area channels 26 allow passage of a fluid medium such as a hardenable mortar. In addition, the raised-region channel 26 can occupy the material of the anchor 10, thereby facilitating deformation of the raised region 16 and thus insertion of the anchor 10 into the hole.

The wedge region 12, the transition region 42 and the tip region 41 are provided with wedge region passages 22, each extending longitudinally through the wedge region 12, the transition region 42 and the tip region 41. These wedge region channels 22 may facilitate manufacturing and/or improve installation and anchoring. The wedge region channel 22 is aligned with the raised region channel 26. As can be seen particularly clearly in fig. 4 and 5, the wedge region channel 22 and the bulge region channel 26 are both offset in the circumferential direction from both the neck region groove 23 and the middle region groove 25.

In its front region, the anchor bolt 10 has a relatively high mirror symmetry: within typical manufacturing tolerances, the intermediate region 15 is mirror symmetrical to the neck region 13, while the raised region 16 has some symmetry similarity to the wedge region 12, all with respect to a mirror plane extending perpendicular to a longitudinal axis 99 through the abutment region 14. In addition, the wedge region 12 is provided with longitudinally extending surface grooves (i.e., wedge region channels 22), as is the raised region 16 (i.e., raised region channels 26), and at least a portion of the raised region 16 is at the same axial distance from the abutment region 14 as at least a portion of the wedge region 12. This high symmetry may provide a specific symmetrical distribution of forces in the cross-wedge rolling manufacturing process.

When mounting the anchor, the front end first introduces the anchor into the hole of the substrate 6. Subsequently, the anchor bolt 10 with its wedge region 12 is pulled back together, in particular by tightening a nut, not shown, which is arranged on the thread of the rear region 17 of the anchor bolt 10. Thereby, the wedge area 12 is pulled into the front end area of the expansion shell 30 and the expansion shell 30 is displaced radially, thereby anchoring the expansion anchor. The resulting configuration is shown in fig. 6. The raised region 16 is dimensioned such that it creates an interference fit with the substrate 6 when it is located in the hole.