WO2023020854A1

WO2023020854A1 - Fastening system and method for the recessed retention of insulation elements

Info

Publication number: WO2023020854A1
Application number: PCT/EP2022/071977
Authority: WO
Inventors: Ulrich Knebel; Erhard Hackler; Wolfgang Schäfer
Original assignee: Ejot Se & Co. Kg
Priority date: 2021-08-18
Filing date: 2022-08-04
Publication date: 2023-02-23
Also published as: DE102021209067A1

Abstract

The invention relates to a fastening system (1) for the recessed retention of an insulation element (2) on a substrate (3), having: a fastening element (4), wherein the fastening element (4) has a fastening region (41) and an external thread (42), and a retaining element (5), wherein the retaining element (5) has a retaining shank (51), a retaining plate (52) and a tool receptacle (53), wherein the retaining shank (51), the retaining plate (52) and the tool receptacle (42) are arranged on one another for conjoint rotation, at least one cutting means (54) is arranged for conjoint rotation on the retaining plate (52) in order to cut into the insulation element (2) at the circumference of the retaining plate (52) and to be able to set the retaining plate (52) in a recessed manner, and at least one mating means (55) is arranged for conjoint rotation on an inner side of the retaining shank (51), the mating means being able to be brought into engagement with the external thread (42) of the fastening element (4), and to a method for the recessed retention of an insulation element (2) on a substrate (3) with the aid of a fastening system (1).

Description

Fastening system and method for recessed holding of insulating elements

The present application relates to a fastening system for holding an insulating material element in a recessed manner on a substrate and a corresponding method.

To insulate houses, insulating elements are attached to a substrate, such as walls, ceilings and floors. There are different concepts for this. In one concept, a depression is formed in the insulation element, in which a holding element is arranged. The depression with the holding element arranged therein is then filled with an insulating material. The arrangement of the holding element in the depression in particular prevents the holding points of the insulation element from being visible on the surface.

Various methods and fastening systems are described in the prior art, with which such a recessed holding can be realized. However, the systems are still expensive to manufacture and handle. Therefore, there is a need for a simpler and cheaper implementation of recessed mounting.

This object is achieved by the subject matter of the present application. Preferred embodiments emerge from the dependent claims and from the following description. The object is achieved by a fastening system for holding an insulating element in a recessed manner on a substrate. The fastening system has a fastening element and a holding element.

The fastening element is an element with which the holding element can be fastened to a substrate under the insulating element. Examples of a such fastener is a screw or nail. The fastening element can be connected directly or indirectly to the substrate. An example of a direct connection is placing a wood screw in a wooden base. An example of an indirect connection is arranging the fastening element in an expansion element, for example a dowel in the ground. In principle, the fastening element can be divided into at least two areas. A first area, which is closer to or even below the ground during assembly, is referred to as the attachment area. This fastening area is designed to hold the fastening element directly or indirectly on or in the substrate. A second area on which the holding element is held is referred to as the holding area. This holding area has an external thread. The external thread is preferably spaced from the attachment area.

The holding element is an element with which the insulating material of the insulating element is held on the fastening element and thus also on the substrate. In the context of the present invention, the holding element has a holding shaft, a holding plate and a tool holder. The holding shaft, the holding plate and the tool holder are arranged on one another in a rotationally fixed manner. This means that when one of these components of the holding element is rotated, the other components rotate accordingly. In a preferred embodiment, the holding element has been manufactured in one piece with its components. In principle, however, it is also possible for the holding element or one of its components to be manufactured separately and then to be connected to the other components in a torque-proof manner.

The holding shaft is a section of the holding element which extends essentially in the direction of the longitudinal extent of the fastening element when the fastening element is arranged in the holding element as intended. In connection with the present invention, this direction is also referred to as the axial direction. According to the invention, an anti-rotation means is arranged on the inside of the holding shaft in a rotationally fixed manner, which can be brought into operative connection with the external thread of the fastening element. Such an operative connection is present, for example, when a rotation of the holding element or the fastening element relative to the other element, an axial movement of one of the elements relative to the other of the elements causes. If, for example, the holding element is rotated and the fastening element does not rotate with it, the holding element moves in the axial direction relative to the fastening element, depending on the direction of rotation either towards the ground or away from the ground.

The holding element also has a holding plate. The retaining plate consists of one or more projections, which are referred to below as retaining projections, and which extend in the radial direction from the retaining shaft. These holding projections are designed to hold the insulation element. In a preferred embodiment, the one or more retaining projections extend substantially in a plane extending substantially perpendicular to the longitudinal axis of the retaining shaft, i.e. the axial direction. When retaining an insulating material element in a recessed manner, the one or more retaining projections in most cases lie on the bottom of the recess formed in the insulating material element and thus prevent the insulating material element from moving in a direction away from the substrate. In a preferred embodiment, the retaining plate is a retaining projection that extends concentrically around the retaining shaft.

According to the invention, at least one cutting means is arranged in a rotationally fixed manner on the holding plate. This at least one cutting means is an essential means to form the recess in the insulating element. A recessed hold differs, for example, from a so-called surface-flush hold. In the case of holding flush with the surface, a holding means, for example a holding plate, is arranged on the surface of the insulating material, while in the case of holding recessed, the holding is carried out below the surface—that is to say in a recessed manner. In order to make this possible, the holding element requires means so that it can be arranged in a recessed manner in the insulating material. In the context of the present invention, this is the at least one cutting means. It is designed to cut into the insulating material when the holding plate is rotated. In the context of the present invention, the term cutting and the associated cutting means is used as a generic term for various possible separation processes, such as cutting, milling, planing, breaking, etc.. With the help of the cutting means, part of the insulating material, preferably the insulating material arranged under the holding plate from the other insulating material to a certain one depth separately. Depending on the design of the at least one cutting means, the cutting edge in the insulation element is designed differently. The formation of the depression can be supported by other means. For example, the holding plate can compress the insulating material under the holding plate. In addition, it is also possible that the holding plate mills away the insulating material under the holding plate. However, these are only examples and the present invention is not limited thereto.

In a preferred embodiment, the support plate is circular and the cutting means is arranged substantially at the periphery of the circular support plate. By turning the holding element and thus also the holding plate, the insulating element is cut into the peripheral circle of the holding plate.

Within the scope of the present invention, the cutting means can be implemented using a wide variety of means. For example, the cutting means can be realized by a projection arranged on the underside of the holding plate, which in some embodiments has a cutting edge, for example in the form of a sawtooth. However, the cutting means can also be an integral part of the holding plate, which cannot be distinguished from the rest of the holding plate. In this case, the at least one cutting means can be defined by the design of the edge of the holding plate and/or by the rigidity of the holding plate, in particular in the edge area.

The holding element according to the present invention also has a tool holder. The tool holder of the holding element is designed and intended to rotate the holding element with the aid of a corresponding tool. The aim is to rotate the holding element relative to the fastening element, so that the holding element moves in the direction of the substrate, supported by the external thread of the fastening element. The tool holder can, for example, be connected to the corresponding tool by means of a form fit. For this purpose, the holding plate can have, for example, corresponding recesses or projections, but also, for example, a combination of projections and recesses. The process of forming the indentation by the fastening system according to the present invention differs from the known processes. So far, the holding element and the fastening element have been designed in such a way that the holding element also moves in the direction of the ground as a result of a movement of the fastening element into the ground, thereby forming the depression. When using the fastening system according to the present invention, however, the fastening element does not move any further into the ground when the holding element moves in the direction of the ground and the recess is formed in the insulating element. In particular, this has the advantage that the formation of the depression no longer affects the fastening of the fastening element to the substrate. In this way, the attachment to the substrate can be ensured in a first step and the depression can then be formed in a subsequent step.

According to a preferred embodiment, the fastening element is a screw and, more preferably, the fastening element has a corresponding external thread at least in the fastening area.

According to a further preferred embodiment, the fastening system has another tool holder. In addition to the tool holder in the holding element, in a preferred embodiment the fastening element can also have a tool holder. The tool holder of the fastener is referred to as the drive holder for better differentiation. The drive mount is used to fasten the fastening element to the substrate as part of the installation of the fastening system. If the fastening system is a screw, for example, the screw can be screwed into the substrate using the drive mount.

According to a further preferred embodiment of the present invention, the fastening element consists of plastic. Fastening elements made of plastic, in particular screws made of plastic, are already known in the prior art. However, all-plastic screws have proven to be particularly prone to failure in connection with recessed assembly. In particular, if the plastic screw is screwed further into the substrate while the depression is being formed, this can lead to the screw breaking. Due to the new assembly concept of the present invention, however, this problem no longer exists, so that all-plastic screws can also be used.

According to a further preferred embodiment, the fastening system also has a spreading area which is designed to be spread open by the fastening area of the fastening element. The expansion area is designed in order to attach the attachment area of the attachment element to the substrate. As a result, the fastening element can be anchored in a drilled hole in a substrate. The expansion area can then act like a dowel.

In a further preferred embodiment, the fastening system is designed in such a way that the holding element can be displaced relative to the expansion area as part of the setting of the fastening system. This displacement is preferably realized in that a tool engages in the tool holder of the holding element and rotates it. Due to the interaction between the external thread of the fastening element and the antidote of the holding element, the rear area of the holding element moves in the direction of the ground. This is a movement in the axial direction, since the retaining element, guided by the thread, moves in the direction of the substrate or away from the substrate, depending on the direction of rotation, along the longitudinal axis of the fastening element.

However, the expansion area should then not move, but rather continue to be arranged in the substrate together with the attachment area of the attachment means. In that case, therefore, the retaining element and the expansion area must consist of two separate parts, or the two must be detachably attached to one another.

Within the scope of the present invention, the at least one antidote can be formed by different means. The antidote can be an internal thread, for example, which corresponds to the external thread of the fastening element. However, it is not necessary for a complete internal thread to exist on the inside of the holding shaft. It is sufficient if projections and/or recesses are arranged on the inside in such a way that the external thread of the Fastener can engage in it, as in an internal thread. According to an alternative embodiment, the internal thread is only formed when the fastening element is screwed into the holding shaft. For this purpose, the holding shaft can have one or more projections on its inside. The at least one projection extends essentially in the axial direction in the shaft. When screwing in the external thread of the holding element, this can then form recesses and/or projections in the at least one projection, which act like a corresponding internal thread.

To form the recesses and/or projections in the at least one counter-means, the external thread can be designed in such a way that it has different threads in different areas. For example, the external thread can have a thread at the end that is arranged closer to the fastening area, which thread is designed to form the recesses and/or projections in the at least one antidote when screwed in. For example, the external thread may first have a pre-tapping thread portion at the end located closest to the attachment portion. This pre-tapping thread can have an outer diameter which essentially increases along the extension of the pre-tapping thread. The pre-cutting thread is designed to allow easy inching or pre-cutting. After that, a thread-forming area with a larger outer thread diameter can be arranged. This is preferably the largest external thread diameter of the external thread. This thread-forming area can have milling ribs on the thread flanks for further cutting of the thread in the antidote. An area with a fastening thread can then be arranged behind it, which preferably has an average thread diameter. In addition, the external thread can have a recess or a plurality of recesses in the thread, which simplify the removal of material when forming the antidote. This one or more recesses can also be referred to as a clearing edge. The one or more recesses are preferably arranged in the area with the pre-tapping thread, in the thread forming area or in both areas. The object is also achieved by a method for holding an insulating material element in a recessed manner on a substrate with the aid of a fastening system. The fastening system has a fastening element and a holding element. First, a hole is drilled into the insulation element and, if necessary, into the underlying substructure. The fastening system is then introduced into the hole and a fastening area of the fastening element is fastened to the substrate. Thereafter, the holding element is rotated relative to the fastening element and a depression is thereby formed in the insulating material, namely with the aid of at least one cutting means on the circumference of a holding plate of the holding element.

A tool designed for this purpose can also be used when setting a fastening system for holding an insulating material element in a recessed manner on a substrate. The tool has several components. This includes a fastening component that is designed to be connected to a drive receptacle of a fastening element of the fastening system. The tool also includes a retention member configured to connect to a tool receptacle of a retention member of the fastening system. In addition, the tool also has a drive component that is designed to be connected to a drive. The tool is also designed to transmit a rotational movement of the drive to the fastening component and as soon as the fastening component has reached a certain position relative to the surface of the insulating element, the transmission of the rotational movement to the fastening component is terminated and the rotational movement of the drive is transmitted to the holding component instead .

The invention is explained in more detail below using exemplary embodiments with the accompanying drawings. Further details, features and advantages of the subject matter of the invention result from the exemplary embodiments described. Show it:

Figure 1 shows a sectional view of an embodiment of the

Fastening system according to the present invention in an insulating element and in a substrate arranged underneath, Figure 2 shows a sectional view of an embodiment of the

Fastening system without insulation element and without substrate,

Figures 3a, 3b show a sectional view and a top view of an embodiment of a fastening element,

Figures 4a, 4b show sectional views of embodiments of the holding element,

Figures 5a to 5c show the sequence of assembly of an embodiment of the fastening system according to the present invention in several steps,

Figures 6a, 6b show a side view and a perspective view of an embodiment of the tool,

Figures 7a, 7b show examples of the design of the tool holder of the holding element, and

Figures 8a, 8b show a sectional view and a perspective view of an external thread, as it can be used within the scope of the present invention.

Figure 1 shows a sectional view of an embodiment of the fastening system 1 according to the present invention. In the sectional view shown in Figure 1, the fastening system is already in a hole in an insulating element 2 and in the substrate 3 arranged underneath.

FIG. 2 shows a sectional view of an embodiment of the fastening system 1 without an insulating element 2 and without a substrate 3 . The fastening system 1 has a fastening element 4 and a holding element 5 . In the embodiment shown in Figure 2, the fastener 4 is a screw. The fastening element 4 has a front area and a rear area, with the front area being arranged on or in the subsurface in the installed state and the rear area being arranged above or in front of the subsurface. The front area of the fastening element 4 has a fastening area 41 and the fastening element 4 has an external thread 42 in the rear area. In the exemplary embodiment shown in FIG. 2, the fastening element 4 also has a drive receptacle 43 . The drive receptacle 43 is designed to be connected to a correspondingly designed drive. As explained above, this mount is referred to as a drive mount and not a tool mount IO to be able to conceptually distinguish them from a tool holder 53 of the holding element 5 .

The holding element 5 shown in FIG. 2 has a holding shaft 51, a holding plate 52 and the tool holder 53 already mentioned. At least one counter-means 55 is arranged on the inside of the holding shaft 51, which cannot be seen in FIG. 2 and is therefore described in more detail later in connection with FIGS. 4a and 4b.

In addition, a spreading area 6 is arranged on the holding element 5 in this embodiment. This expansion area 6 is designed to attach the attachment element 4 in a hole in the substrate 3 together with the attachment area 41 of the attachment element 4 . The expansion area 6 acts like a dowel. In the embodiment shown here, the expansion area 6 is connected to the holding shaft 51 . However, this is a detachable connection because the holding shaft 51 and the holding plate 52 of the holding element 5 move relative to the fastening element 4 and thus also to the expansion region 6 arranged on the fastening region 41 of the fastening element 4 when used as intended.

FIG. 3a shows a sectional view through a fastening element 4 and FIG. 3b shows a plan view of a fastening element 4. In the exemplary embodiment shown here, too, the fastening element 4 is a screw. In the front area, the fastening element 4 has a fastening area 41 which, in this exemplary embodiment, is designed as a screw thread. In the exemplary embodiment shown in FIGS. 3a and 3b, the attachment area is adjoined by an unthreaded area. A rear area with an external thread 42 adjoins the threadless area. As illustrated in FIGS. 3a and 3b, in this exemplary embodiment the fastening area 41 and the adjoining thread-free area have essentially the same outside diameter, while the outside thread 42 has a larger outside diameter in comparison. The point at which the outer diameter changes can be designed as a stop which, when used as intended, can rest against a stop surface of the holding element 5 in order to prevent the Fastening element 4 is moved further into the holding element 5. The sectional view in FIG. 3a also shows a drive receptacle 43 of the fastening element 4, which is designed to be connected to a correspondingly designed drive.

FIG. 4a shows a sectional view through an embodiment of the holding element 5 without the fastening element 4 arranged therein. The holding element 5 has a holding shaft 51 and a holding plate 52. The tool holder 53 is formed in the holding plate 52 . Two antidotes 55 are visible on the inside of the holding shaft 51 in the view of FIG. 4a. In the embodiment shown here, the counter-means 55 are each formed by a projection extending axially on the inner wall of the holding shaft 51 . In the context of the present invention, the axial direction is the direction of the longitudinal extension of the fastening element 4. In FIG. 4a, the projection extends over the entire height of the holding shaft 51. This is not necessary, ie the projection can also be shorter. However, the projection is preferably designed in such a way that the projection and the external thread 42 cannot lose contact when the fastening system 1 is used as intended, ie the retaining element 5 is held by the external thread 42 of the fastening element 4 . However, as already explained above, the antidote 55 can also be implemented by other configurations. An alternative antidote is, for example, an internal thread corresponding to the external thread 43 . However, it is also known to the person skilled in the art that other projections and recesses can also be designed and arranged in such a way that they can take over the function of the counter-means 55 .

The holding plate 52 shown in FIG. 4a also has a cutting means 54. In this embodiment, however, the cutting means 54 is designed in such a way that it cannot be structurally distinguished from the rest of the holding plate 52 . Only when holding element 5 is used does it become apparent that this edge of holding plate 52 acts like a cutting means, since it separates the insulating material of insulating material element 2 arranged under holding plate 52, i.e. the insulating material arranged directly below the holding plate from the insulating material arranged in the radial direction outside of the Insulating material located on the holding plate is separated. In the embodiment shown in FIG. 4a, an expansion area 6 is arranged on the holding element 5. FIG. In this embodiment, the holding element 5 and the expansion area 6 are two separate components which are arranged in a form-fitting manner on one another such that they can move relative to one another in an axial direction. However, other implementations for the interaction of holding element 5 and expansion area 6 are also known to those skilled in the art. For example, both can be connected to one another by a predetermined breaking point. In addition, a further component can be arranged between the expansion area 6 and the holding element 5 .

FIG. 4b shows an alternative embodiment of the antidote 55. In this embodiment there is only one projection. In a further alternative embodiment, the holding element 5 has three or four of these axially extending projections as counter-means 55 .

FIGS. 5a to 5c show the assembly sequence of an embodiment of the fastening system 1 according to the present invention in several steps.

FIG. 5a shows the arrangement of an embodiment of the fastening system 1 according to the present invention in an insulating element 2 and a substrate 3. For this purpose, a hole was previously drilled in the insulating element 2 and in the substrate 3 arranged underneath. Subsequently, the fastening system 1, which has a fastening element 4, a holding element 5 and an expansion area 6, was inserted into the hole. In principle, the fastening element 4 can first be arranged in the holding element 5 and then the fastening system 1 with the fastening element 4, the holding element 5 and the expansion area 6 can be inserted into the hole. Within the scope of the present invention, however, the fastening system 1 can also be inserted step by step into the hole by first only arranging the holding element 5, optionally with the expansion area 6, in the hole and then the fastening element 4 in the holding element 5 and the expansion area 6.

In the embodiment shown in Figure 5a, the holding element 5 was so far in the

Hole arranged that the holding plate 52 of the holding element 5 on the surface of Insulation element 2 rests. The fastening system i is preferably designed to be used with an insulating element 2 with a certain thickness. This ensures that the fastening system i is firmly connected to the substrate 3 when the holding plate 52 rests on the surface. In the embodiment shown in FIG. 5a, the fastening system 1 is designed in such a way that the expansion area 6 of the fastening system 1 is located in the hole in the substrate 3 when the holding plate 52 rests on the insulating material.

In a next step, it is ensured that the fastening system 1 is fastened to or in the substrate 3 . In the embodiment shown in FIG. 5a, this is achieved in that the fastening area 41 of the fastening element 4 is moved into the expansion area 6. As a result, the expansion area 6 and also the attachment area 41 of the attachment element 4 are anchored in the hole in the substrate 3 . As already explained above, the present invention also includes other options for fastening at least the fastening element 4 to or in the substrate 3 .

In this embodiment, the fastening element 4 is rotated and thus moves in the holding element 5 in the direction of the base 3. As a result, the fastening area 41 is screwed into the expansion area 6 in the hole in the base 3.

In the embodiment described here, the fastening element 4 is moved axially in the direction of the substrate 3 relative to the holding element 5 . This is important in this embodiment because this relative movement moves the external thread 42 so far into the holding shaft 51 that the holding element 5 can then be moved into the insulation material relative to the fastening element 4 . In the context of the present invention, however, this is not absolutely necessary. In principle, it is also possible that when the fastening system 1 is inserted into the hole, the external thread 42 is already in a position in the retaining shank 51 which allows the relative axial movement between the external thread 42 and the retaining shank 51 when the retaining element 5 is rotated relative to the fastening element 4 allows deepening. In that case it would be useful not only the fastener 4, but also to rotate the holding element 5 when attaching it to or in the base 3 in order to reduce or prevent the relative movement between the two.

As already mentioned, in this embodiment this rotational movement also causes the external threads 42 to move relative to the retaining shank 51. The retaining shank 51 is retained in the hole in the insulation element 2 and does not rotate when the fastener 4 in the retaining element 5 is rotated. This can be due to the friction between the outside of the holding shaft 51 and the insulating element 2 . The cause of this can also be, for example, projections on the outside of the holding shaft 51 or other effects. The external thread 42 of the fastening element 4 then moves relative to the counter-means 55 of the holding element 5. In the embodiment shown here, the counter-means 55 is formed by projections which extend in the holding shaft 51 in the axial direction. Due to the relative movement between the external thread 42 and counter-means 55, the external thread 42 forms recesses in the projections of the counter-means 55, so that the counter-means 55 acts like a complementary internal thread.

FIG. 5b shows the fastening system 1 after the fastening area 41 has been fastened in the substrate 3. FIG. The anchoring of the fastening element 4 on or in the substrate 3 is now complete. In addition, the external thread 42 is in a position in the holding shaft 51 which allows a relative movement of the holding shaft 51 in the direction of the substrate 3 relative to the external thread 42 . The holding plate 52 is still on the surface of the insulating element 2. Now the depression in the insulating element 2 is formed. For this purpose, however, the fastening element 4 is not simply moved further into the substrate 3 as in the prior art. This can affect the reliability of the anchoring of the fastening element 4 in the substrate 3 . In addition, the fastening element 4 can be damaged, particularly if it is made of plastic.

According to the present invention, therefore, the holding element 5 is now rotated relative to the fastening element 4 . The holding element 5 has a tool holder 53 which is formed in the holding plate 52 in the present embodiment. A tool that rotates the holding element 5 can engage in this tool holder 53 . Since the fastening element 4 is firmly attached to or in is fastened to the substrate 3, the rotation of the holding element 5 is often not suitable for also rotating the fastening element 4, so that the desired rotation of the holding element 5 relative to the fastening element 4 takes place. Alternatively, the tool can also engage in the drive receptacle 43 of the fastening element 4 and hold it while the holding element 5 is rotated.

In the embodiment shown in FIG. 5b, the fastening system 1 has a retaining element 5 and an expansion area 6. As already explained above, the expansion area 6 and the holding element 5 are preferably two separate parts or can be easily separated from one another, for example with the aid of a predetermined breaking point. This is important because when the holding element 5 , in particular the holding shaft 51 and the holding plate 52 , the expansion area 6 should not rotate as well, in order not to influence the fastening of the fastening element 4 to the substrate 3 .

Due to the interaction of the external thread 42 of the fastening element 4 and the counter-means 55 of the holding element 5, the rotating holding element 5 moves on a helical line, like a cylindrical spiral in the direction of the substrate 3. As a result, the holding plate 52 in particular rotates and it presses on the surface of the insulating element 2. The at least one cutting means 54 arranged non-rotatably on the holding plate 52 thereby cuts into the insulating material element 2 on the circumference of the holding plate 52 . In addition, the holding plate 52 compresses the area of the insulating element 2 located beneath it. The depression in the insulating element 2 is formed by this interaction of cutting and compressing. But as already explained above, within the scope of the present invention, the component cutting in the cutting means 54 is used as a generic term for a large number of cutting processes, such as cutting, milling, planing, breaking, etc.. With the help of the cutting means, the insulating material is cut under the holding plate 52 separated from the rest of the insulating material of the insulating element 2.

The holding element 5 can be turned, for example, until the rear end of the fastening element 4 is flush with the surface of the holding plate 52 . However, the fitter can also be informed in other ways if one is sufficient deep depression was formed. For this purpose, the tool can have a depth stop, for example. It is often important that the indentation is of a suitable size for a prefabricated roundel made of insulating material. In the position of the fastening system 1 shown in FIG. 5c, the retaining element 5 has formed the depression and the depression has already been closed again with a suitable round washer.

FIGS. 6a and 6b show two views of an embodiment of a tool 100 for setting a fastening system 1 for holding an insulating material element 2 in a recessed manner. The tool 100 has a number of components. This includes a fastening component 110, which is designed to be connected to a drive receptacle 43 of a fastening element 4 of the fastening system 1. The tool 100 also has a holding component 120, which is designed to be connected to a tool receptacle 53 of a holding element 5 of the fastening system 1. In addition the tool 100 also includes a drive member 130 configured for connection to a drive. In the embodiment shown here, the tool 100 also has a depth stop 140 . Tool 100 is also configured to transmit a rotational movement of the drive to fastening component 110, and as soon as fastening component 110 has reached a specific position relative to the surface of insulating element 2, the transmission of the rotational movement to fastening component 110 is terminated and the rotational movement of the Transfer drive to the holding member 120.

Figures 7a and 7b show external views of two embodiments of the holding element 5, as can be used within the scope of the present invention. The figures illustrate two alternatives for the design of the tool holder 53. In the embodiment in FIG. 7a, the holding element 5 has a tool holder 53a on the holding plate 52, which is formed by projections—three projections in this embodiment. A corresponding tool 100 then has components that are designed to contact the projections of the tool holder in such a way that a rotational movement can be transmitted. In the embodiment shown in FIG. 7b, the tool holder 53b has recesses, with the aid of which corresponding components of a tool 100 can transmit a rotational movement. Figures 8a and 8b show a sectional view and a perspective view of an external thread 42 as can be used within the scope of the present invention. The external thread 42 is configured to form recesses and/or protrusions in the at least one antidote. According to the embodiment shown in FIGS. 8a and 8b, the external thread 42 has different areas for this.

Starting from the end of the external thread 42 which is arranged closer to the attachment area 41, the external thread 42 can first have an area 200 with a pre-tapping thread. In the embodiment shown here, the thread in this area 200 with the pre-tapping thread has an outer diameter which essentially becomes larger and larger along the extension of the pre-tapping thread. This can be seen in particular from the perspective view in FIG. 8b. The pre-cutting thread is designed to allow easy inching or pre-cutting. After that, in this embodiment, a thread-forming area 210 with a larger outer thread diameter is arranged. The largest external thread diameter of the external thread 42 is preferably located in this area. This thread-forming area 210 can have milled ribs on the thread flanks for further cutting of the thread in the antidote. A region 220 with a fastening thread can then be arranged behind it, which again preferably has a somewhat smaller thread diameter. For the sake of illustration, the different areas have been clearly delimited in FIG. 8a. In principle, however, it is also possible for the transitions between the area 200 with the pre-cutting thread, the thread-forming area 210 and the area 220 with the fastening thread to be fluid.

In addition, the external thread 42 can have one or more recesses 230 in the thread. The one or more recesses 230 may facilitate the removal of material when forming the antidote. They are also referred to as clearing edges. In the embodiment shown in FIGS. 8a and 8b, the recesses 230 are arranged in the area with the pre-tapping thread 200 and in the thread-forming area 210. FIG.

Claims

Claims A fastening system (1) for retaining an insulating element in a recessed manner

(2) on an underground

(3) comprising: a fastener (4), said fastener

(4) has a fastening area (41) and an external thread (42), and a holding element (5), wherein the holding element

(5) has a holding shank (51), a holding plate (52) and a tool holder (53), the holding shank (51), the holding plate (52) and the tool holder (53) being arranged on one another in a rotationally fixed manner, on the holding plate (52 ) at least one cutting means (54) is arranged in a rotationally fixed manner in order to be able to cut into the insulating element (2) on the circumference of the holding plate (52) and to be able to set the holding plate (52) in a recessed manner, and at least one anti-rotation means ( 55) is arranged, which can be brought into engagement with the external thread (42) of the fastening element (4). The fastening system (1) according to claim 1, wherein the fastening element (4) is a screw. The fastening system (1) according to one of claims 1 or 2, wherein the fastening element (4) further comprises a drive socket (43). The fastening system (1) according to any one of the preceding claims, wherein the fastening element (4) consists of plastic. The fastening system (1) according to any one of the preceding claims, wherein the fastening system (1) also has an expansion area (6) which is designed to fasten the fastening area (41) of the fastening element (4) in the substrate (3).

6. The fastening system (1) according to any one of the preceding claims, wherein the counter means (55) is formed by at least one projection which extends axially in the support shaft (51).

7. The fastening system (1) according to any one of the preceding claims, wherein the external thread (42) has a region (200) with a pre-tapping thread.

8. A method for holding an insulating element (2) in a recessed manner on a substrate (3) using a fastening system (1), comprising:

drilling a hole in the insulating element (2),

Inserting the fastening system (1) comprising a fastening element (4) and a holding element (5) into the hole,

Fastening a fastening area (41) of the fastening element (4) to the substrate (3), and

Rotating the holding element (5) relative to the fastening element (4), with the aid of at least one cutting means (54) on a circumference of a holding plate (52) of the holding element (5) forming a recess in the insulating element (2).