Field of the Invention

The present invention relates to a tilt anchor of the type with an anchor rod and a longi- tudinally elongated anchor element, which is mounted on. the anchor rod, which anchor element has an elongated open channel for, at least partially, receiving the anchor rod in a first extreme position, where the anchor element is arranged parallel to the anchor rod, and which anchor element has a through transverse hole for receiving the anchor rod in a second extreme position, where the anchor element is arranged at perpendicular to the anchor rod, which anchor element is arranged for displacement between the first extreme position and the second extreme position, as a contact element is mounted on the anchor rod, on which the anchor element is in contact in the first and second extreme positions. Moreover, the invention relates to the use of such tilt anchor.

Background of the In vention

The tilt anchor has been developed in connection with an anchor system for mounting on roofing felt or membrane-covered roofs and of the type that includes at least one base for mounting on a roof surface, which base includes a base plate for attachment to the roof surface and a first anchor rod protruding from the upper side of the base plate , which are connected to anchor means which are designed depending on the intended use, A second anchor rod is also mounted in the base plate and extends downwards from the underside of the base plate and is provided with fastening means, such as a tilt anchor, so that the second anchor rod can be fixed in the supporting roof structure below the roof surface, The roof can be of the type that includes a supporting plate for roofing felt/membrane cover, an underlying insulation and a supporting roof construction, where the base is manufactured integrated with a roofing felt/membrane cover, which can include a lower roofing fell and an upper roofing felt for attachment to the roofing felt/membrane cover. Anchor systems for use on roofing felt or membrane covered roof's can be used when mounting solar cell systems, terraces and the Like on a roof surface. Furthermore, the anchor system can be used as a safety system, which is used for fall protection of per- sons who must stay on roofs. There is a legal requirement which means that fall protec- tion must be established for work on roofs. Fall arresters will typically include eyelets or wires that are attached to the roof surface. People can connect to these eyes or wires via harnesses, which are worn by the user and which are connected to the eyes and/or wires via lines/straps. Anchor systems of this type are known, for example, from WO 2017/041805.

Installation of the safety equipment required in a safety system is subject to strict re- strictions depending on the roof structure in which it is installed. The requirements for such fall protection systems are described in the standard DS/EN795.

During testing, the anchor points must withstand both falling loads and static loads. It has been particularly a problem to comply with fall load requirements, where dynamic loads occur that tire significantly higher than the static loads that occur in fall prevention systems, which ensure that people cannot reach a roof edge and thus cannot fall over the edge.

There has therefore been work for many years to establish safely systems that can be approved as fall protection systems, Until now, it has been difficult to achieve strength in anchor systems where tilt anchors are used. Here, the tilt anchors have not had a strength so that they can withstand the dynamic loads that can occur in the event of a fall .

The known tilt anchors, as described in the introduction, are formed by bending a flat metal plate into a U-shape and thereby achieving strength by imparting different profiles to the U-shaped anchor element. The anchor element is mounted on the anchor rod in order to be guided through a bore in the roof structure with the anchor element in a first extreme position, where the anchor element is arranged parallel to the anchor rod. The anchor element can then be swung to the other extreme position, where the anchor element is arranged perpendicular to the anchor rod, and then it is tensioned to abut against the underside of the roof structure. Typically, the contact element is designed as a pivot shaft that cooperates with a bearing surface on the anchor element to enable the rotation. The pivot shaft has a threaded mounting hole, with which it is mounted on a threaded anchor rod.

Although the tilt anchor has been developed in connection with anchor systems, it will also be able to be used in other contexts where there is a need for tilt anchors that require great strength.

For many years there has therefore been a need for keel anchors with greater strength than the known keel anchors.

Object of the Invention

The purpose of the present invention is to provide a tilt anchor of the type mentioned at the outset, which makes it possible to remedy the disadvantages of the known till an- chors and thereby provide a tilt anchor that is particularly suitable for use in an anchor system, which provides effective fall protection.

According to a further aspect it is intended to provide a tilt anchor which is contrary to the traditional construction with a U-shaped channel for the anchor element.

Description of the Invention

According to the present invention this is obtained with a tilt anchor of the type de- scribed in the in introduction and which is defined in the preamble of claim 1 and which is peculiar in that the elongated channel in a first section of the anchor element com- prises a first channel section with an opening that is oriented in a first direction and in a second section of the anchor clement a second channel section with an opening ori- ented in a second direction which is directed opposite to the first direction, that the through transverse hole is arranged between the two channel sections with orientation in the same direction as the first and second directions, and that the anchor element is formed by a rod-shaped element with a planar contact surface, and in which the elongate channel and the transverse hole are formed. Furthermore, rhe invention rela tes to the use of the tilt anchor according to the invention. Hereby there is provided a fall protection system having a great strength hi the bases applied.

With the tilt anchor according to the invention, it is possible to establish an atachment to the supporting fixed building struc ture that is located under the roof and the insulation by using a tilt anchor that has great strength. Hereby, a firm anchor of the base is estab- lished in a supporting roof construction, such as a metal construction or wooden con- struction.

By using an anchor rod that goes through the roof and fixing this to the supporting roof structure, a solid mounting point is established that can absorb vertical loads in the form of tension or pressure , and which can be used to mount equipment for placement above the roof surface. The load applied to the tilt, anchor on the anchor rod will thus be safely transferred to the supporting roof structure. The supporting structure is sometimes also referred to as a load-bearing structure.

It has been found that one can change the traditional way of forming an anchor element in the form of a U-shaped, bent plate which forms an open, U-shaped channel which is only on one side of the anchor element and achieve a stronger tilt anchor.

By forming the anchor member with a first channel section oriented in a first direction and a second channel section oriented in the opposite direction, it becomes possible to manufacture the anchor member from a rod-shaped member that is either cast or post- machined for to form the two channel sections.

The anchor element also has a transverse hole which is arranged between the two chan- nel sections. The transverse hole is oriented with the same orientation as the first and second directions for the two channel sections. The dimension provided on the channel sections and the transverse hole allows the anchor rod to be received therein.

The anchor rod can thus be received in the elongate channel element by passing through the elongate channel which extends through the entire anchor element. In this way, the anchor element in its first posi tion will be arranged on the anchor rod in a position above the contact element. In this position, the anchor element will rest on the anchor element with an orientation parallel to the anchor rod. This allows the anchor rod to be passed through a bore formed in the same way as tilt anchors have previously done. After passing through the opening, the anchor element can be moved to its second ex- treme position, where the anchor element is perpendicular to the anchor rod. In this position, the anchor rod will extend through the through transverse hole. In this position, the planar contact surface will be provided in a plane which is perpendicular to the longitudinal direc tion of the anchor rod. In other words, the anchor rod will extend per- pendicularly from the contact surface of the anchor element The anchor element will rest on its opposite side against the contact element on die anchor rod.

It is noted that it is possible to angle the anchor element in relation to the rod element at angles other than 90°. This can be done by designing the contact element with a su.it- able inclined surface for contact with the anchor element, whereby you can establish different angles and thus adapt the tilt anchor to constructions where the underlying surface does not need to be parallel to a surface on the other side of the construction.

The anchor element will preferably be made of steel. It is preferred to use stainless steel, and this steel can preferably be an acid-resistant steel.

This means that the anchor can be used in different environments.

As mentioned above, the anchor element in the first extreme position, where it is ori- ented parallel to the anchor rod, will be located in a position where it does not protrude beyond the anchor rod, but rests on the contact element, which is arranged on the anchor rod. This means that the anchor rod must simply be passed through an opening with a distance that corresponds to the diameter of the anchor element. The anchor element can then be moved to its second extreme position in contact against the contact element.

When manufacturing the anchor element from a rod-shaped element, it has been shown that a very high tensile strength is achieved for the tilt, anchor. Thus, the keel anchor will be particularly suitable for use in situations where great strength is needed, such as for example in fall protection systems. As an example, it can be mentioned that for a 0 12 mm anchor rod in acid-resistant steel AIS1 316 and an anchor element formed from a 022 mm rod in acid-resistant steel A LSI 316, a tensile strength of over 5 tons has been measured, without the tip anchor being broken,

According to a further embodiment, the tilt, anchor according to the invention is peculiar in that the rod-shaped element is a cylindrical rod-shaped element.

By using a cylindrical, rod-shaped element, a particularly simple construction is achieved, With a cylindrical, rod-shaped element, the greatest amount of material is achieved for use as an anchor element in relation to the opening through which the tilt anchor must be passed before it is mounted on a structure.

According to a further embodiment, the tilt anchor according to the invention is peculiar in that the anchor element has a chamfered side to form the planar contact surface, which in the second extreme position of the anchor element is arranged so that the longitudinal direction of the anchor rod is perpendicular to the contact surface.

When a cylindrical, rod-shaped element or other round or oval anchor element is used, it is an advantage that a chamfer is provided on one side. This creates the planar contact surface, which in the anchor's position of use must be positioned in such a way that the longitudinal direction of the anchor rod is perpendicular to the planar contact surface. Hereby, the anchor element's planar contact surface will lie against the underside of a surface against which the anchor element must be brought into contact.

It, is noted that the rod-shaped element can have other shapes, and can thus be square, pentagonal, hexagonal or other angular shapes. However, a cylindrical rod shape with the formation of a chamfered edge is an advantageous shape for reasons of optimizing the strength of the tilt anchor.

According to a further embodiment, the tilt anchor according to the invention is peculiar in that the elongated channel is a cylindrical bore, which bore extends through the an- chor element and is preferably formed by mechanical removal of material. The elongated channel can advantageously be provided as an elongated cylindrical bore that extends through the entire anchor element. Material can then be removed, for ex- ample by milling or other mechanical processing, so that in one section of the anchor element a channel is formed that is open in one direction, and in the other section a channel is formed that is open in the opposite direction.

It is thus a technically simple way that is used to provide the anchor element of the tilt anchor. According to a further embodiment, the tilt anchor according to the invention is peculiar in that the planar bearing surface is formed by a chamfered side surface at one section of the anchor element and an upper side of side walls for the channel section which is located at another section of the anchor element. The flat contact surface is formed by a chamfer. Hereby, the chamfered side surface at one section of the anchor element, together with the upper side of the side walls, which are provided at the exposed channel section located at the other section of the anchor element, will form the overall contact surface. The contact surface will thus be a flat surface, where on one side of the anchor rod there is a single contact surface, and where on the other side of the anchor rod there are in principle two contact surfaces which are formed by the upper side of the side walls.

With suitable dimensioning, it is possible to provide the total area of the contact surface on one side of the anchor rod and the contact surface on the other side of the anchor rod with the same size.

.According to a further embodiment, the tilt anchor according to the invention is peculiar in the fact that the through hole is a cylindrical bore, which bore is preferably formed by mechanical removal of material, and that around the hole in a side that is provided opposite the planar contact surface, a contact surface for contact with the contact ele- ment on the anchor rod. In this way, a flat contact surface is obtained in a simple way, which can be given a desired angle, so that the angle between the anchor element and the anchor rod can be chosen depending on need, According to a feather embodiment, the tilt anchor according to the invention is peculiar in that the displacement of the anchor element relative to the anchor rod comprises a combined translation and rotation.

The anchor element can make a movement, in which a displacement is made along the anchor rod and a rotate or swing about it, when it is brought from its first extreme posi- tion to its second extreme position.

This means that a tilt anchor, which is passed through a bore in a construction where the tilt, anchor is to be used, can make an initial translation and displacement along the anchor rod, without the need for the anchor element to be passed completely through the drilling and be free at the surface where the anchor element must subsequently be brought into contact. This helps to reduce the need for the free space that is needed behind the supporting surface where the anchor element is brought into contact. According to a further embodiment, the tilt anchor according to the invention is peculiar in that the contact element is mounted in a fixed position on the anchor rod.

It is preferred that the contact element is mounted at a fixed position at an outer end of the anchor rod. The contact element can be provided in the form of a nu t on a threaded anchor rod, although the nut is arranged in a fixed position.

.According to a further embodiment, the ti lt anchor according to the invention is peculiar in that the anchor element is mounted displaceable along the anchor rod, the anchor rod preferably being threaded and provided with a nut which forms at least part of the an- chor element.

By providing the contact element displaceable on the anchor rod, it will be possible to make an adaptation to different heights on the construction for which the tilt anchor is to be used, A particularly simple way of providing the displacement is by threading the anchor rod anti providing the contact element in the form of a nut. In addition to the nut, the attachment element may include other elements, such as washers, pivot joints and the like, which are arranged between the nut and the anchor element. According to a further embodiment, the keel anchor according to the invention is pecu- liar in that the anchor element is in contact against the contact element, with a first end face of the rod-shaped element when the anchor element is in the first extreme position, whereby the rod-shaped element is received in the elongated channel. When the tilt anchor is to be used, the anchor element with a first end surface of the rod-shaped element will be In contact with the contact element. As mentioned above, in this situation the rod-shaped element will be accommodated in the elongated channel and can easily be passed through the opening provided in the construction where the rock anchor is to be used.

According to a further embodiment, the tilt anchor according to the invention is peculiar in that the first end surface of the anchor element has a chamfer, which is provided on the side facing away from the planar contact surface. By providing a chamfer on the first end surface of the anchor element, w hich is in con- tact against the contact element, it is ensured that the anchor element can make a dis- placement movement with a translation and swing away from the contact surface, after which the anchor element's own weight will provide the subsequent rotation, thus that the anchor element is arranged against the contact element with the anchor rod extend- ing through the continuous transverse hole.

.According to a further embodiment, the tilt anchor according to the invention is peculiar in that the anchor rod is threaded, that a displaceable bushing is arranged on the anchor rod, which bushing has a contact surface at a first end that is directed towards the anchor element, that a nut is arranged on the anchor rod opposite die anchor element and ar- ranged for contact against the other end of the bushing opposite the anchor element in order to be able to press the bushing in the direction of the anchor element. In the tilt anchor, it is preferred that a bushing is provided with a contact surface in the form of a disk that has a circular shape, so that .it can cover the hole used for passing the rod element and the anchor element through the construction where the tilt anchor must be used. This makes it possible to tighten around a structure with the bushing’s contact surface located on one side of the structure and with the contact surface of the anchor element against the opposite side of the structure where the tilt anchor is used.

It thus becomes possible to press the bushing in the direction towards the anchor ele- ment by using the nut, which is arranged on. the threaded anchor rod. Thus, a firm and tight clamping can be achieved, which can be advantageous in constructions where a moisture barrier is included.

According to a further embodiment, the tilt anchor according to the invention is peculiar in the fact that a bearing cup and a bearing shaft are provided between the attachment element on the anchor rod and the anchor element, which enable the anchor element to be supported on the attachment element in any position between the two extreme posi- tions.

By providing a bearing element with a bearing cup and a bearing shaft, it is possible that the anchor element can be provided with an arbitrary angular position in relation to the anchor rod. In this way, the tilt anchor can be used, even if opposing surfaces on the construction where it is used are not parallel.

According to a further embodiment, the tilt, anchor according to the invention is peculiar in that the anchor rod forms part of an anchor rod that is mounted in a base plate that forms part of an anchor system for mounting on roots, where the anchor rod extends downwards from the underside of the base plate, so that the tilt anchor can be installed against the underside of a supporting roof structure. With this design, the tilt anchor can be easily mounted to the base plate. Furthermore, the clamping of the base plate will establish a secure mechanical connection, which provides a rigid construction having bending stiffness. With the mechanical connection from the base plate to the supporting roof construction, there is a security that pull or pressure in the vertical direction will not affect the roof surface and thus risk leaks in the roofing felt/membrane cover. By using a tilt anchor, which is in contact with the underside of the supporting roof structure, an contact plate can be damped down against, the upper side of a plate, where the tilt anchor is in contact with the underside. Thus, it will be possible to clamp a plate in a supporting roof structure, which can be. for example, a steel trapezoidal plate or a wooden plate. Here, the keel anchor will tighten towards the under side of the steel plate, while the reinforcement tube is clamped down towards the upper side of the plate.

It is preferred that a disc is also used, which is brought into contact with the upper side.

In both cases, however, a fixed mechanical connection with the supporting roof struc- ture will be achieved.

In the tilt anchor, a swivel joint can be provided which, like swivel joints in known tilt anchors, includes a bearing cup and a bearing shaft, which enables the anchor element to be supported on the anchor element in any position between the two extreme posi- tions. However, it will be noted that a tilt anchor, where the anchor element must rest against an inclined surface in a construction where it is used, can be rotated about the longitudinal direction of the anchor rod until the anchor element is in an angular position which is parallel to the opposite surface of the construction. A support in an arbitrary angular position is therefore generally not an essential function. Alternatively, two displaceable bushings can be provided in the tilt anchor, which are provided with inclined surfaces that are directed towards each other and at the same angle in relation to the longitudinal direction of the anchor rod. Between the two in- clined surfaces, the anchor element can be arranged with a fixed inclined angle when it is brought to its second extreme position, which in this case will not be perpendicular to the anchor rod, but rather directed under an inclined angle which is determined of the inclined surface of the two bushings.

With such a tilt anchor, it is possible to define an inclined location for the anchor ele- ment depending on the angle of the inclined surfaces chosen for the bushings. Description of the Drawing

In the following, the invention will be explained in more detail with reference to the accompanying drawing, where Fig. 1 shows a perspective partial view of a base for a known anchor system.

Fig. 2 shows a partial view of a part of the one in Fig. 1 shows a base in which a known tilt anchor is used,

Fig. 3 shows a. partial view of a tilt anchor according to the invention with the anchor element in a first extreme position, Fig. 4 shows a partial view corresponding to Fig. 3, but with the anchor element in a different extreme position.

Fig. 5 shows a picture of that in Figs. 3 and 4 shown anchor element seen from the top,

Fig. 6 shows a sectional view of that in Fig. 5 shown anchor clement seen according to VI-VI in fig. 5,

Fig. 7 shows a picture of that in Fig. 5 shown anchor element seen from the side.

Fig. 8 shows a picture of that in Fig. 5 shown anchor element seen from one side,

Fig. 9 shows a picture of that in Fig. 5 shown anchor element seen from the other side, and Fig. 10 shows a partial vie w corresponding to Fig. 4 of another embodiment of the tilt anchor according to the invention.

Detailed Description of the Invention

In the following, identical or corresponding elements will be designated with the same reference designation. Thus, a specific explanation will not be given in connection with such details in connection with each of the figures of the drawing.

Fig. 1 shows a base 1 in a known anchor system. The anchor base comprises a base plate 2 and a first anchor rod 3 that protrudes from the base plate. The anchor rod 3 is attached to the base plate via a bushing 4, as the rod 3 is provided with a thread that cooperates with a thread in the bushing 4. The base also includes a layer of lower roofing felt 5 and a layer of upper roofing felt 6. Between the two layers of roofing felt 5, 6, a metal plate 7 is welded Into the upper roofing felt to increase durability, A steel pipe 8 and a self-adhesive liquid seal 9 are arranged above the top roofing felt 6.

An aluminum closure 10 is provided at the top of the construction, When the elements are mounted on the first anchor rod 3, an outer threaded end will be excellent over the aluminum closure 10, This threaded end can then be used for attach- ing anchor means, which will be discussed in more detail below.

At the underside of the base plate 2, a second anchor rod 11 is attached via a bushing (not shown). This is provided with fastening elements, which in the form shown are provided in the form of a concrete screw 12. Around the second anchor rod 11, a rein- forcement pipe 13. A disc 14 is provided on the lower side of the reinforcement pipe, which is used for sealing against a vapor banner. The contact plate 2 Is a square plate which is provided with a three-dimensional struc- ture, as eight radially oriented projections 15 are provided. The projections are directed diagonally in relation to the plate and perpendicular to the side edges 16 of the plate.

As seen in fig. 2, the second anchor rod is used in the form of a threaded rod 11 with a tilt anchor mounted on the threaded rod 11 with an anchor element 24, The anchor is passed through the hole 40 in a steel plate.

As can be seen from fig. 2, an anchor elemen t 24 in a tilt anchor, when it is arranged on the underside, will swing to the position shown, and then by an upward pull in the an- chor rod 11 , a bearing of the tilt anchor 24 will be established against the underside 42 of a steel trapezoidal plate 37.

By tightening the threaded anchor rod 1 1 at the bottom, as shown in the lower drawing in fig. 2, the disk 14 will be clamped down against the upper side 43 of the steel trapezoidal plate 37. The steel trapezoidal plate will thereby be clamped between the tilt anchor and the disk friend 14, The disk 14 will establish a clamping of a vapor barrier 22, so that there is security against leakage in the vapor barrier by hole 40. Figures 3 and 4 show a tilt anchor 101 according to the present invention with an anchor pliers 102 and an anchor element 103,

In Figure 3, the anchor element 103 is shown in a first extreme position, where the anchor element with a longitudinal direction 105 is directed parallel to the longitudinal dire ction 104 of the anchor rod 102.

In Figure 4, the anchor element. 103 is shown in another extreme position, where the anchor element with the longitudinal direction 105 is directed perpendicular to the lon- gitudinal direction 104 of the anchor rod 102,

The anchor rod 102 is provided in the form of a threaded rod. A contact element 106 is provided in the form of a nut, which is mounted at a free end 107 of the anchor rod 102. A threaded bushing 108 is mounted on the anchor rod 102, The threaded bushing 108 is provided with an annular collar 109, which faces the construction element 106,

A cover nut 110 is provided at the top of the anchor rod 102.

The anchor element 103 can make a displacement, which is indicated by an arrow 11 1, between the first extreme position, which is shown in Figure 3, and the second extreme position, which is shown in Figure 4.

In the first extreme position, the anchor element is positioned with a first end surface 112 at a first end pari 1 13 of the anchor element 102 in contact with the conta ct elemen t 106. At the first end part 113, the anchor element is provided with a chamfer 114, which facilitates the displacement from the first extreme position to the second extreme posi- tion. Figures 5-9 show various images and sections of the anchor element 103. The anchor element 103 is formed by a cylindrical rod-shaped element having a diameter 115 (see Fig. 8). Inside the cylindrical element there is a through bore 116 with a diameter 1 17. In the anchor element 103, the bore 116 forms a first channel section 118 in a first section 119 of the anchor element and a second channel secti on 120 in a second section 121 of the anchor element.

The first channel section 118 has an opening 122 that is oriented in a first direction 123, and the second channel section 120 has an opening 124 with an orientation 125 that is oriented in another direction opposite to the first direction 123.

Between the two channel sections 118 and 120, the anchor element comprises a through transverse hole 126. The hole 126 has a diameter 127 which is larger than the diameter 128 of the rod element, so that the rod element 102 can pass through the transverse hole

126 when the anchor element 103 is arranged in its second extra position.

The diameter 117 of the bore 116 is also larger than the diameter 128 of the rod element, so that the rod element can be accommodated in the elongated channel formed by the bore 1 16 when the anchor element 103 is in the first extreme position.

The cylindrical anchor element 103 has a chamfered side that is formed by a planar contact surface 129. The planar contact surface 129 is formed by a planar surface 130 at one side of the through opening 126 and at an upper side 131 of the first and second sides -wall 132 for the first channel section 118. Thus, the planar contact surface 129 will face outwards from the plane of the paper from the image shown in figure 5 and will face upwards for the section shown in figure 6 and upwards for the side view shown in figure 7. In the anchor element 103, a. chamfer 133 has been made on one side opposite the planar contact surface 129 to form the open second channel section 120, which is formed with an opening with an orientation downwards, as seen in figure 7. The surface 134, which is formed thereby, will form a ihcility for the facility element 106. In the shown embodiment of the tilt anchor according to the invention, the contact ele- ment 106 is shown as a nut on the threaded rod. This contact element 106 can be ar- ranged in a fixed position on the anchor rod 102 or be provided displaceable along the anchor rod 102.

The tilt anchor 101 shown in figures 3-9 can he used in the base illustrated in figures 1 and 2. In this situation the anchor rod 102 will be mounted on or form part of the second anchor rod 11. In this situation the anchor element 24 shown in figure 2 be replaced with an anchor element 103 as illustrated in figures 3-9.

In fig, 10 shows another embodiment of the til t anchor 101 according to the invention .

The keel anchor shown in fig. 10, differs by being provided with two bushings 135. The bushings 135 are freely displaceable along the anchor rod 102 and are also freely rotat- able around the anchor rod 102, as they are provided with a through bore 136 that has a diameter that is larger than the diameter of the anchor rod 102.

The two bushings 135 are each provided with an inclined surface 137 which is directed towards the other. The two inclined surfaces 137 can be arranged so that they are par- allel, and so that the anchor element 103 can be received between them when it has been brought to its second extreme position, which is shown in fig. 10.

In fig. 10, the second extreme position for the anchor element 103 is not arranged per- pendicular to the anchor rod 102 but at an angle in relation to the longitudinal direction of the anchor rod, which is determined by the angle of the inclined surfaces 137.

The two bushings 135 are also provided with end surfaces 138, which are directed per- pendicular to the longitudinal direction 104 of the anchor rod 102. Thus, the end sur- faces 138 will serve for contact against a construction where the co-anchor is used, respectively for contact against the contact element 106 at a downward feeing surface 138. In the first extreme position (not shown), the anchor element 103 will be in a first ex- treme position, which is illustrated in fig. 3, with one bushing 135 arranged below the anchor element and the other bushing arranged above the anchor element 103. The chamfer 114 will contribute to a slight displacement of the anchor element 103 from the first extreme position in which the anchor element is arranged during assembly to the second extreme position shown in Fig. 10 when in use.