Fastener, use of a fastener, and corrosion-protection system

Abstract

A fastener (10), of which the fastening body (18) has a fastener head (14) at a first end and a fastener foot at a second end, which is opposite the first end, wherein the fastener (10) has at least two fastening-arm elements (12), which are arranged on the fastener head (14) and / or on a fastener neck (16) and are angled from the fastener body (18), wherein each of the at least two fastening-arm elements (12) is configured so as to be inclined in the direction of the fastener body (18).

Description

[0001] Dowel, use of a dowel, and corrosion protection system

[0002] DESCRIPTION:

[0003] The present invention relates to a dowel, preferably a plastic dowel. The invention also relates to the use of a dowel for attaching anode components of a corrosion protection system, for example, for attaching anodes to the surface of a building. The invention also relates to a corrosion protection system comprising an anode and at least one dowel.

[0004] Commercially available plastic anchors for fastening anode components, such as mixed metal oxide (MMO) titanium anodes, pose a weak point for the bond between a coupling system, such as concrete or plastic-modified mortar, and an anode system. The shape and properties of commercially available plastic anchors often cause bond failures in the area of ​​the plastic anchor between a substrate and the coupling system, which can lead to local spalling of the coupling system. Commercially available plastic anchors also increase the risk of local failure of a cathodic corrosion protection system.

[0005] JP H 04202680 A describes a fixation band with a width of 4 to 9 millimeters, a length of about 20 to 80 millimeters and an average thickness of about 1 to 4 millimeters, which is made of semi-hard plastic.

[0006] JP 2002-020887 A describes a mounting device for an electrode to prevent electrical corrosion. JP 2009-114518 A discloses a groove closure device with a press-fit edge.

[0007] JP 2009-114519 A describes another groove closure device.

[0008] Plastic anchors for cathodic protection systems are currently commercially available from, for example, De Nora, Aegion Corp., and Chemical Newtech.

[0009] The contact surface of the anchors with the coupling system poses a bonding risk, where the bond between the coupling system, anchor, and base is significantly reduced or even absent. The consequences of bonding failures at the fastening areas limit the coupling and the associated electrolytic contact and electrolytic conductivity of the coupling system.

[0010] One object underlying the invention is to improve the adhesion of a corrosion protection system.

[0011] The stated object is achieved by the anchor according to the invention, by the use of the anchor according to the invention, and by the corrosion protection system according to the invention of the independent claims. Advantageous further developments are provided by the dependent claims.

[0012] The invention is based on the idea of ​​providing a dowel on whose dowel neck and / or dowel head at least, and in particular three, fastening arm elements are arranged, which are angled from a main axis of the dowel, i.e. from a dowel body of the dowel, and whose extension inclines towards the dowel body. These fastening arm elements have, in particular, two different lengths. In other words, the three fastening arm elements, in particular, are angled at a predetermined angle of less than 90 degrees with respect to the extension of the dowel body. This enables the anode component to be pressed against the base by the fastening arm elements when the anode component is fastened using the dowel, with the dowel body being placed in a drilled hole in the base (subsurface, e.g., concrete).The end of the respective fastening arm element facing away from the dowel neck and / or head exerts additional pressure on the base, allowing the anode component to be pressed even more firmly and preventing the dowel from shifting. This makes the fastening particularly stable, and the position of the anode component can be secured. The two different lengths of the fastening arm elements, in particular, serve to secure various anode components with different widths. The dowel neck can be a section of the dowel body adjacent to the dowel head.

[0013] This ensures that the anode component is securely positioned even beneath the anchor. The angle of the fastening arm elements can be selected, preferably in accordance with the elasticity of the material, to ensure maximum pressure on the material. The fastening arm element(s) beneath which the anode component is not pressed counteracts the pressure applied to the fastening arm element securing the anode component. These fastening arm elements therefore serve as a stabilizer. The angle of all fastening arm elements allows more pressure to be exerted on the anode component and the concrete. Furthermore, the angle of the fastening arm elements allows the anchor to be inserted into a shorter hole.If, for example, a drill bit is used to drill the hole that no longer drills the exact desired length due to material wear, the anchor can still be inserted and exert sufficient pressure on the anode component and the concrete base so that the adhesion remains high.

[0014] The anchor according to the invention comprises a anchor body having a anchor head at a first end and a anchor foot at a second end opposite or opposite the first end. The anchor body is that portion of the anchor that forms the main axis of the anchor and is inserted into the borehole to secure, for example, the anode component. The anchor head is that end of the anchor body that, after insertion into the borehole, is positioned at the opening of the borehole, e.g., protrudes from the borehole. Accordingly, the anchor foot is the opposite end that protrudes furthest into the borehole. The anchor can preferably be designed as an expansion anchor, wherein the anchor body, after insertion into the borehole and after securing another object, exerts an expanding effect on the wall of the borehole and thus on the base. In this case, the anchor body can also be referred to as an expansion body.

[0015] The dowel according to the invention is characterized in that it has, in particular, three fastening arm elements arranged on the dowel head and / or dowel neck and angled from the dowel body—i.e., from the main axis of the dowel. Each of the, in particular, three fastening arm elements is inclined toward the dowel body and thus toward the main axis of the dowel. Each of the, in particular, three fastening arm elements is thus designed to be inclined toward the dowel foot. In other words, the angle between the dowel body and the respective fastening arm element is less than 90 degrees. Preferably, the angle of inclination between the dowel body and the fastening arm element can be 45° to 89°, ideally between 80° and 85°, or 85°.

[0016] A fastening arm element is an element of the anchor that extends from the anchor head in a rod-like or web-like manner, and whose end facing away from the anchor head is free-standing when uninstalled. This means that the three angled fastening arm elements are not connected to each other, in particular that their ends are not connected to each other.

[0017] In contrast to a plate on the dowel head, those fastening arm elements through which, for example, the anode is not secured can counteract the force much better through counterpressure. The other fastening arm elements therefore do not absorb the counterpressure of the anode component and can, in turn, exert a higher counterpressure on the fastening arm element with the clamped anode component. This significantly increases the hold of the dowel and thus of the anode component on the fastening base. Furthermore, the design of the dowel according to the invention also allows the fastening arm elements to be designed differently for different anode components and purposes, which significantly increases the degrees of freedom in the application of the dowel. The inclination of the fastening arm elements also results in the advantages already mentioned above.Depending on the number of fastening arm elements and the application, the material to be fastened can also be clamped, for example, under two fastening arm elements and pressed against the fastening base, which further improves the hold. In contrast to a dowel with, for example, a head plate, this also has the advantage that significantly less material needs to be used in the manufacture of the dowel.

[0018] The anchor can preferably be made at least partially of plastic, ideally entirely of plastic. This improves its applicability, particularly in conjunction with a corrosion protection system in which an anode component, such as an impressed current or sacrificial anode, is attached to a metal.

[0019] In a particularly preferred embodiment of the anchor according to the invention, the three fastening arm elements are cylindrical. The surface of each fastening arm element that rests on the substrate is minimal, which also minimizes the pressure surface on the substrate. This significantly increases the pressure on the substrate, improving grip, and the coupling mortar can be poured around the fastening arm elements. This ensures that the anchor and thus, for example, the anode component, adhere particularly well to the substrate. The fastening anchor is therefore an ergonomic anchor that, thanks to its shape, requires a minimal amount of space. In other words, the round or cylindrical shape of the three fastening arm elements offers a better bond between the coupling mortar and the substrate compared to conventional anchors such as those with a head plate.

[0020] This also ensures even better that a titanium anode, for example, is bonded to the coupling mortar beneath the anchor and thus, in turn, to the substrate. In combination with the cylindrical design or the cylindrical design, such an anchor can also be arranged on the substrate in such a way that the pressure area is only on the front side of the fastening arm element, i.e. at the free-standing end of the fastening arm element, i.e. only the free-standing end of the fastening arm element rests on the substrate. In contrast to prior art anchors, in which a fastening arm rests over a length of one centimeter, the fastening arm of the anchor according to the invention only rests over a distance of 1 millimeter, for example.

[0021] The particularly preferred embodiment of the anchor according to the invention has three fastening arm elements. This embodiment is particularly advantageous for fastening the anode component in the form of an anode mesh. Due to the number of fastening arm elements, a star-shaped arrangement of the fastening arm elements results, which ensures significantly better hold. The ideal number of fastening arm elements is three fastening arm elements. With such a configuration, two fastening arm elements can secure the mesh, and the third fastening arm element can build up counterpressure to the other two.

[0022] The design with at least three fastening arm elements, preferably three fastening arm elements, allows all three fastening arm elements to rest on the material, even with meshed materials. The inclination of the fastening arm elements can preferably be selected in accordance with the elasticity of the material to ensure maximum pressure on the material.

[0023] If one of the fastening arm elements is longer than another or a further one of the fastening arm elements, the anchor can be used to fasten different materials, for example anode components of different heights and / or widths, such as anode strips. This advantage also arises if a material is fastened that, for example, has sections of different widths and / or heights. Preferably, one of the fastening arm elements can be longer than all of the other fastening arm elements. In other words, only one of the fastening arm elements can have a greater length. If the anchor has three fastening arm elements, preferably one of the fastening arm elements can be longer than the other two. In addition to the advantages already mentioned, each variant results in less material being used to manufacture the individual anchor.In a particularly preferred embodiment of the dowel according to the invention, at least one of the fastening arm elements can have a support element at the end spaced from the dowel head and / or dowel neck. A support element is understood to be an element or section designed to support the fastening arm element. The support element can preferably be designed as a mandrel, support foot, pin, or hook, preferably as a mandrel. The support element is angled such that, after being inserted into the drill hole, the fastening arm element hooks or presses into the substrate with the support element. Such a support element at the end of the fastening arm element provides additional hold and reduces slipping of the fastening arm element and thus of the dowel during its fastening. Slipping can even be prevented entirely.A further advantage is that the coupling mortar can flow around the support element and thus hold the anchor even better.

[0024] A further advantage is that once the anchor is installed, the fastening arm element can be lifted with the support element, allowing the anchor to be pulled out of the drilled hole. This type of anchor is particularly effective if only one of the fastening arm elements has such a support element. However, the more fastening arm elements have a support element, the better the hold.

[0025] Ideally, the anchor can have a fastening arm element that is longer than the other fastening arm elements, with the longer of the fastening arm elements containing the support element. Preferably, only the longer of the fastening arm elements can have the support element. The longer fastening arm element with the support element at the end has the function of fastening, for example, an anode component, such as titanium strips, with a predetermined width to the substrate. The support element ensures that outward displacement is not possible. At the same time, in the case of perforated materials, the support element serves to penetrate into the perforation and hold it in position. The anchor head can preferably have a rounded edge. In other words, the bearing surface, i.e. the striking surface of the anchor, does not have sharp edges but is rounded at the edge.After securing the anode component with the anchor, the coupling mortar can penetrate along the rounded edge under the anchor head and partially enclose it. This significantly increases the anchor's hold on the substrate.

[0026] The above-mentioned object is also achieved by using an embodiment of the anchor according to the invention for fastening an anode component. The corrosion protection anode can preferably be a titanium anode. This results in the above-mentioned advantages.

[0027] Accordingly, the above task is also solved by a

[0028] Embodiment of the dowel according to the invention for fastening a

[0029] Anode component. The advantages mentioned above also apply here.

[0030] The above-mentioned object is also achieved by a corrosion protection system comprising an anode component and at least one anchor of the above-described embodiments. The anode component can be an expanded material such as a mesh anode, comprise one or more titanium strips, and / or consist of solid titanium material. When used according to the invention, the anode component can be laid, for example, on a concrete surface. It thus serves as a key component for a cathodic corrosion protection system of a protected object.

[0031] The invention also includes further developments of the inventive use and the inventive corrosion protection system, which have features already described in connection with the further developments of the anchor according to the invention. For this reason, the corresponding further developments of the inventive use and the inventive corrosion protection system are not described again here.

[0032] The invention also encompasses combinations of the features of the described embodiments. The invention therefore also encompasses implementations that each comprise a combination of the features of several of the described embodiments, unless the embodiments are described as mutually exclusive.

[0033] Exemplary embodiments of the invention are described below. These show:

[0034] Fig. 1 is a schematic three-dimensional representation of an embodiment of the dowel according to the invention;

[0035] Fig. 2 is a further schematic representation of a section of the dowel according to the invention in a side view of one of the shorter fastening arm elements;

[0036] Fig. 3 is a further schematic representation of the dowel according to the invention in plan view;

[0037] Fig. 4 is a further schematic representation of a section of the dowel according to the invention in a side view of the longer fastening arm element;

[0038] Fig. 5 is a schematic representation of an embodiment of the corrosion protection system according to the invention and the use according to the invention;

[0039] Fig. 6 is a further schematic three-dimensional representation of a further embodiment of the dowel according to the invention; and

[0040] Fig. 7 is a further schematic representation of a further section of the dowel according to the invention in a side view of the longer fastening arm element.

[0041] The exemplary embodiments explained below are preferred embodiments of the invention. In the exemplary embodiments, the described components of the embodiments each represent individual features of the invention that can be considered independently of one another, each of which also develops the invention independently of one another. Therefore, the disclosure is intended to encompass combinations of the features of the embodiments other than those shown. Furthermore, the described embodiments can also be supplemented by further features of the invention already described.

[0042] In the figures, the same reference symbols designate elements with the same function.

[0043] Fig. 1 illustrates the principle of the anchor using a first exemplary embodiment. The anchor can preferably be used to attach an anode component to a base, such as concrete, of a protected object. The three-dimensional view of the anchor 10 in Fig. 1 shows a design with three fastening arm elements 12 arranged on a anchor head 14 of the anchor 10. In the example of Fig. 1, the exemplary three fastening arm elements 12 can be arranged on the anchor neck 16.

[0044] The dowel body 18, which comprises the dowel head 14 with the support surface 20, the dowel neck 16, and the dowel foot 22, can preferably have a portion with a plurality of anchoring grooves 24. If the dowel body 18 with the anchoring grooves 24 is made of an elastic plastic, the dowel 10 can also be used for holes drilled with a drill that no longer drills the exact dimensions due to wear.

[0045] For example, if the hole for the anchor 10 is drilled using a drill bit that has already been used over 20,000 times for drilling into concrete, the drill bit may be somewhat thinner due to material wear and may no longer drill holes with a diameter of 4.5 millimeters, for example, but only with a diameter of 4 millimeters. However, the design of the anchoring grooves 24 allows the anchor 10 to still fit into such a smaller hole. This advantage increases synergistically if the anchor body 18 is at least partially made of an elastic plastic.

[0046] A distance of only 0.8 millimeters from the locking tabs 32 is particularly advantageous, with an anchoring groove 24 forming between each pair of locking tabs 32. The locking tab 32 can also be referred to as a wing. The locking tabs 32 can preferably be tapered.

[0047] The pointed profile of the dowel foot 22, as shown by way of example in Fig. 1, is also advantageous in this regard. The dimensions mentioned in Fig. 2 and Fig. 4 are also particularly advantageous in this regard.

[0048] Preferably, the anchor 10 can have a rounded support surface 20. In other words, the support surface 20 of the anchor head 14 can have a rounded edge 26. After the anchor 10 is secured, the coupling mortar can run under the anchor head 14 and contact the substrate at this edge.

[0049] The exemplary anchor 10 comprises three fastening arm elements 12 that protrude from one another in a star shape. Alternatively, the anchor 10 can have more than three fastening arm elements 12, or only two fastening arm elements 12. However, the design with three fastening arm elements 12 is preferred due to the advantages already discussed above. This also applies to the variant shown in Fig. 1 with one fastening arm element 12 that is longer than the two other fastening arm elements 12. The two shorter fastening arm elements 12 can, for example, be the same length.

[0050] In the example of Fig. 1, each of the fastening arm elements 12 comprises a support element 28 at the end of the respective fastening arm element 12 facing away from the dowel head 14. In another variant, for example, only the longer fastening arm element 12 can have such a support element 28. The support element 28 can preferably be designed as a claw, pin, or mandrel.

[0051] The anchor 10 in Fig. 1 also shows the preferred variant, in which each of the fastening arm elements 12 is cylindrical or designed as a cylinder. In particular, the rounded ends 30 of each fastening arm element 12 contribute to the coupling mortar flowing around the respective fastening arm element 12, so that only a minimal area of ​​the underside of the respective fastening arm element 12 has direct contact with the substrate. If the two shorter fastening arm elements 12 each have a length of 20.97 millimeters, for example, and the longer fastening arm element 12 has a length of 25.94 millimeters, the anchor can be used particularly well, for example, for attaching a net.For example, a mesh can be secured beneath the long fastening arm element by the longer fastening arm element 12, and another part of the mesh can be secured by one or both of the shorter fastening arm elements 12. Alternatively, such a dowel 10 can be used for different bands, for example, either for a titanium band with a width of 20 millimeters, in which case this titanium band is then fixed beneath the longer fastening arm element 12, or for a titanium band with a width of 13 millimeters, which can then be secured by one or both of the shorter fastening arm elements 12.

[0052] Fig. 1 also shows the inclination of the fastening arm elements 12. The inclination of the respective fastening arm element 12 is towards the main axis of the dowel body 18, i.e., towards the dowel body 18.

[0053] Fig. 2 shows a side view of the anchor 10 of Fig. 1, showing the anchor body 18 and one of the two short fastening arm elements 12. The second, shorter fastening arm element 12 and the longer fastening arm element 12 are not visible in Fig. 2.

[0054] Preferably, both shorter mounting arm elements 12 may have the dimensions shown in Fig. 2. The dimensions shown in Fig. 2 are preferred dimensions that can be implemented individually, but preferably in the combination specified below.

[0055] A preferred angle of inclination, shown in Fig. 2 between the main axis H and the perpendicular S thereto, may preferably be an angle W1 of 5 degrees. A preferred angle of inclination, measured between the fastening arm element 12 and the dowel body 18, may then correspondingly be an angle of 85°.

[0056] For reasons of clarity, the reference symbol in Fig. 2 is only given for one of the locking tongues 32, as well as for one of the anchoring grooves 24. Also for reasons of clarity, not all reference symbols are given for the dowel body 18. Preferably, however, the dowel 10 of Fig. 2 can correspond to the dowel of Fig. 1.

[0057] Preferred dimensions M for the short mounting arm element 12, which has a

[0058] Diameter D1 of 4.00 millimeters, the following dimensions M are:

[0059] M1 = 2.00 millimeters, and

[0060] M2 = 20.97 millimeters.

[0061] Preferred dimensions M for the dowel body 18 can be:

[0062] M3 = 0.50 millimeters

[0063] M4 = 9.60 millimeters

[0064] M5 = 0.50 millimeters

[0065] M6 = 1.00 millimeters

[0066] M7 = 1.30 millimeters

[0067] M8 = 4.60 Millimeters

[0068] M9 = 7.00 Millimeters

[0069] M10 = 7.20 Millimeters

[0070] M11 = 4.00 Millimeters

[0071] M12 = 1.30 Millimeters

[0072] M13 = 9.30 Millimeters

[0073] M14 = 1.60 Millimeters

[0074] M15 = 1.50 Millimeters

[0075] M16 = 4.00 Millimeters

[0076] M17 = 0.80 Millimeters

[0077] M18 = 0.90 Millimeters.

[0078] Fig. 3 shows a plan view of the dowel 10 from Fig. 1. Preferably, however, the dowel 10 of Fig. 3 can correspond to the dowel of Fig. 1. Here, too, not all reference numerals have been shown for the sake of clarity. Fig. 3 illustrates the preferred angle W2 of preferably 135 degrees between the longer fastening arm element 12 and the adjacent shorter fastening arm element 12. The two shorter fastening arm elements 12 can preferably be at an angle W3 of 90 degrees to one another. This also results in an angle (not shown in Fig. 3) of 135 degrees between the longer fastening arm element 12 and the other short fastening arm element 12.

[0079] Fig. 3 also shows the respective support element 28, which can each have a diameter D3 of 1.00 millimeters. The diameter D4 of the dowel neck 16 can preferably be 9.60 millimeters. Further preferred dimensions M for the longer fastening arm element 12 are:

[0080] M19 = 0.50 millimeters

[0081] M20 = 26.07 millimeters

[0082] M21 = 34.37 millimeters.

[0083] The preferred dimension M22 for each of the two shorter fastening arm elements 12 M22 can be 21.07 millimeters.

[0084] Fig. 4 shows a side view of the dowel 10. As with Fig. 2 and Fig. 3, not all reference numerals are indicated for clarity. However, the dowel 10 in Fig. 4 can preferably be the dowel 10 from Fig. 1. Thus, it is particularly preferred that Figs. 1 to 4 show the same dowel 10.

[0085] Fig. 4 shows the anchor 10 with its long fastening arm element 12, which can have a diameter D5 of 4.00 millimeters. The inclination angle W5 can preferably be an angle of 5 degrees. The further preferred dimensions M for the long fastening arm element 12 can be:

[0086] M23 = 2.00 millimeters

[0087] M24 = 25.94 millimeters. The dimensions M3 to M18 have already been specified in Fig. 2.

[0088] The dimensions described in Fig. 2 to Fig. 4 ensure that the dowel 10 has a particularly high frictional resistance when installed, whereby the fastening of the dowel 10 and thus also, for example, of an anode component fastened thereto is particularly good.

[0089] For example, the anchor 10 can be made from a standard plastic compound. However, the anchor 10 is much more flexible and less prone to breakage if a plastic compound based on Pimamid V26LN is used, which has the following preferred properties:

[0090] - a modulus of elasticity of 3,300 / 1,100 MPa (longitudinally oriented / flexural strength; dry as molded / conditioned), at 23°C, 1 mm / min (test method: ISO 527-1-2); and

[0091] - a tensile strength of 85 / 40 MPa (longitudinally oriented / flexural strength; dry as molded / conditioned), at 23°C, 1mm / min (test method: ISO 527-1-2).

[0092] Fig. 5 shows an example of a corrosion protection system 34 with an anode component 36 and, by way of example, two anchors 10, preferably two anchors 10 from Fig. 1. The anode component 36 and the anchors 10 are each shown in a top view. In the example of Fig. 5, the anode component 36 can be designed, for example, as a strip-shaped titanium anode. Fig. 5 thus also shows the use of the anchor 10.

[0093] Overall, the examples show how a dowel 10, which can also be called a fixing dowel, can be provided and used.

[0094] The anchor 10, which can also be referred to as a fastening anchor, is an ergonomic anchor that requires minimal space due to its shape. The round shape of the three fastening arm elements 12, which can be designed as fastening arms, provides a better bond between the coupling mortar and the fastening base. This also ensures that the titanium anode is bonded to the coupling mortar under the anchor 10, preferably a plastic anchor, and in turn to the fastening base. The longer fastening arm element 12 with the support element 28 located at the end, which can preferably be designed as a pin, has the function of fastening, in particular, titanium and / or primary anode strips with a width of up to 25 millimeters to the substrate. The exemplary pin ensures that outward displacement is not possible.At the same time, the exemplary pin serves to penetrate into the perforation and hold the position in perforated materials.

[0095] The two shorter fastening arm elements 12 perform the same function as the longer fastening arm element 12, but for materials with a width of up to 20 millimeters, for example. The star-shaped arrangement of the preferably three fastening arm elements 12 ensures that two fastening arm elements 12 are always resting on the material, while the third fastening arm element 12 serves as a stabilizer.

[0096] This shape allows all three fastening arm elements 12 to rest on the material, even with meshed materials. The inclination of the fastening arm elements 12 is selected in accordance with the elasticity of the material to ensure maximum pressure on the material.

[0097] The dowel head 14, i.e., the head of the exemplary plastic dowel, serves as the striking surface 20. Its shape allows for complete encapsulation by the coupling mortar. In a preferred example, the plastic dowel is anchored in a 6 mm diameter drill hole. The design and material selection of the anchoring grooves 24 ensure that fastening is also possible in a 4.5 mm drill hole when the drill bit becomes worn.

[0098] Particularly preferably, a plastic composition based on Pimamid V26LN (polyamide 6 UL-certified, heat-stabilized, nucleated and lubricated) can be used and has the following preferred properties (Table 1 ):

[0099] Fig. 6 illustrates the principle of the dowel 10 using a further exemplary embodiment. The three-dimensional view of the dowel 10 in Fig. 6 shows, analogous to the exemplary embodiment in Fig. 1, a further and preferred embodiment with three fastening arm elements 12 arranged on the dowel head 14 of the dowel 10. In the exemplary embodiment in Fig. 6, the three exemplary fastening arm elements 12 can also be arranged on the dowel neck 16.

[0100] The dowel body 18, which comprises the dowel head 14 with the support surface 20, the dowel neck 16, and the dowel foot 22, preferably has a thread 25 instead of the portion with multiple anchoring grooves 24. If the dowel body 18 with the thread 25 is made of an elastic plastic, the dowel 10 can also be used for drill holes drilled with a drill that no longer drills the exact dimensions due to wear. According to the invention, the thread 25 and the dimensions of the dowel body 18 are designed to correspond to the diameter of the respective drill hole.

[0101] In particular, the flanks of the thread 25 are at least partially flexible. Multiple flanks can be provided. If, for example, the hole for the dowel 10 is drilled using a drill that has already been used more than 20,000 times for drilling into concrete, the drill can be somewhat thinner due to material wear and, for example, no longer drill holes with a diameter of 4.5 millimeters, but only with a diameter of 4 millimeters. However, the design of the thread 25 allows the dowel 10 to still fit into such a smaller hole. This advantage increases synergistically if the dowel body 18 is at least partially made of an elastic plastic.

[0102] The pointed shape of the dowel foot 22, as shown by way of example in Fig. 6, is also advantageous in this regard. The dimensions mentioned in Fig. 6 and Fig. 7 are also particularly advantageous in this regard.

[0103] In the embodiment of Fig. 6, each of the fastening arm elements 12 comprises a support element 28 at the end of the respective fastening arm element 12 facing away from the dowel head 14. In another variant, for example, only the longer fastening arm element 12 can have such a support element 28. The support element 28 can preferably be designed as a claw, pin or mandrel. Further dimensions and features of the dowel 10 in Fig. 6 are analogous to the embodiment shown in Fig. 1. Fig. 7 shows a side view of the dowel 10, although not all reference numerals are given for the sake of clarity. However, the dowel 10 in Fig. 7 can preferably be the dowel 10 from Fig. 6. Particularly preferably, Figs. 6 and 7 can therefore show the same dowel 10. Features and combinations of features of the embodiment shown in Fig. 7 are analogous to the embodiments shown in Fig. 2 or in Fig. 4 or in Fig. 6.In particular, the embodiment of Fig. 7 refers to the embodiment shown in Fig. 6 with the thread 25 instead of to an embodiment with the portion with several anchoring grooves 24.

[0104] Preferred dimensions M for the short fastening arm element 12 of the illustrated embodiment with thread 25, not shown in Fig. 6 and Fig. 7, which can have a diameter D1 of 4.00 millimeters, are also the following dimensions M and angle W:

[0105] W1 = 5 degrees

[0106] M1 = 2.00 millimeters, and

[0107] M2 = 20.97 millimeters.

[0108] Preferred dimensions M for the dowel body 18 can be:

[0109] M3 = 0.50 millimeters

[0110] M4 = 9.60 millimeters

[0111] M5 = 0.50 millimeters

[0112] M6 = 1.00 millimeters

[0113] M7 = 1.30 millimeters

[0114] M8 = 4.60 millimeters

[0115] M9 = 7.00 millimeters

[0116] M10 = 7.20 millimeters

[0117] M11 = 4.00 millimeters

[0118] M12 = 1.30 millimeters

[0119] M13 = 9.30 millimeters

[0120] M14 = 1.60 millimeters

[0121] M15 = 1.50 millimeters M16 = 4.00 millimeters

[0122] The further preferred dimensions M for the long fastening arm element 12 can be:

[0123] M23 = 2.00 millimeters

[0124] M24 = 25.94 millimeters.

[0125] A preferred angle of inclination, which is shown in Fig. 7 between the main axis H and the perpendicular S thereto, can also preferably be an angle W5 of

[0126] 5 degrees. A preferred angle of inclination, measured between the fastening arm element 12 and the dowel body 18, can then be an angle of 85°. The dowel 10 can also be made of a standard plastic compound, for example.

[0127] Table 1: Table 1 (continued):

[0128] Tab. 1 : preferred properties of the plastic composition, with

[0129] 1): NB:“no break“ (no break);

[0130] *): dry = dry as poured; and cond. = conditioned according to ISO 1110.

[0131] LIST OF REFERENCE SYMBOLS:

[0132] 10 dowels

[0133] 12 Mounting arm element

[0134] 14 Dowel head

[0135] 16 Dowel neck

[0136] 18 dowel bodies

[0137] 20 contact surface

[0138] 22 Dowel foot

[0139] 24 anchoring groove

[0140] 25 threads

[0141] 26 rand

[0142] 28 Support element

[0143] 30 End

[0144] 32 locking tongue

[0145] 34 Corrosion protection system

[0146] 36 Anode component

[0147] H main axis

[0148] S Vertical

[0149] M1 - M24 size

[0150] W1, W2, W3, W4, W5 angles

[0151] D1, D2, D3, D4, D5 diameter

Claims

PATENT CLAIMS:

1. An anchor (10) whose anchor body (18) has an anchor head (14) at a first end and an anchor foot at a second end opposite the first end, characterized in that the anchor (10) has at least two fastening arm elements (12) arranged on the anchor head (14) and / or on an anchor neck (16) and angled from the anchor body (18), wherein each of the at least two fastening arm elements (12) is inclined towards the anchor body (18).

2. Dowel (10) according to claim 1 , characterized in that the dowel (10) is made at least partially, preferably completely, of plastic.

3. Dowel (10) according to one of the preceding claims, characterized in that the at least two fastening arm elements (12) are cylindrical in shape.

4. Dowel (10) according to one of the preceding claims, characterized in that the dowel (10) has at least three or exactly three fastening arm elements (12).

5. Dowel (10) according to one of the preceding claims, characterized in that one of the fastening arm elements (12) is longer than another of the fastening arm elements (12), preferably longer than all other fastening arm elements (12). An anchor (10) according to any one of the preceding claims, characterized in that one of the fastening arm elements (12) has a support element (28) at the end (30) spaced apart from the anchor head (14). An anchor (10) according to claims 5 and 6, characterized in that the longer of the fastening arm elements (12) has the support element (28). An anchor (10) according to any one of the preceding claims, characterized in that the anchor head (14) has a rounded edge (26). Use of an anchor (10) according to any one of the preceding claims for fastening an anode component (36). Corrosion protection system (34) comprising an anode component (36) and at least one anchor (10) according to any one of claims 1 to 8.

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