EP3692215B1 - Holding system for a twist nail - Google Patents

Description

The subject of the invention is a drill nail holding system for anchoring drill nails in a substrate according to the preamble of claim 1.

A drill nail is preferably to be understood as a round metal rod, the outer jacket of which is provided with a thread profile over the entire length of its course.

Such twist nails, regardless of their material properties, can not only be built on the basis of a round rod, but also be angular or oval in cross section, or represent a connection of several profiles.

Similar variations also apply to the mostly continuous course of the external thread of the drill nail, whereby such a thread profile can occasionally be interrupted in its vertical course in the form of strips, sometimes also horizontally, without, however, interrupting the actual thread course between the individual thread segments.

Twist nails are mostly used to connect originally separate elements, the actual holding function preferably coming about through the use of threaded washers or screw nuts that press the originally separated elements together using screws.

However, on the basis of their thread course (comparable to a drill thread), drill nails can be used for drilling-like penetration of materials which, according to their morphology, allow the penetration of such a nail.

In this way, drill nails can be driven into layers of material made of sand, rubble, snow, ice, gravel, stone or their mixtures with one another.

The ideal case is a primer consisting of snow, ice, sand or clay, for example, whereby a drill nail to be inserted follows the pulling direction of its thread profile when it is screwed in and finds the desired hold in the primer.

In many cases, however, the interaction between the thread profile and the primer is not sufficient to introduce such a drill nail into a medium solely on the basis of the given pulling effect, i.e. the drilling process must be reinforced by an additional vertical force (e.g. by means of pressure or impact technology) .

A drill nail inserted into a primer in this way can take on a variety of functions that primarily originate from a geotechnical or structural task and can only be achieved in these work areas where drill nail technology has not been used until now with significantly higher technical and material expenditure can be.

In any comparison with a concrete foundation, however, we find a drill nail retaining system a significantly simplified technology with significantly reduced initial costs.

However, technical reductions of this kind are only convincing and relevant in terms of safety if, after their structural implementation, such alternative systems in terms of the required function and safety are comparable with the properties of a concrete foundation and, as a result of their duration of use, the continued existence of required holding functions are verifiable.

In particular, geotechnical and structural engineering tasks are based on the background that once construction formations have been created, the initial planning situation is subject to constant change over the duration of their use, since weather influences, material fatigue or functional deviations constantly question the actual specifications for such structural engineering measures and are therefore constantly increasing their structural safety must be checked.

The technical support of a drill nail requires in most cases the additional attachment of a retaining plate with which the end of a drill nail is connected to the surface of the primer involved. This holding plate fulfills several functions, e.g. pressure loads that act on this drill nail holder are diverted to the surface of the primer.

In the same way, such retaining plates can also be used to technically accommodate supplementary brackets, which subsequently enable further functional elements to be placed on a retaining plate in a stable manner.

It is also possible to use such retaining plates as a connecting element to other retaining plates if they are appropriately shaped.

Such retaining plates are widely known and justify their function on the one hand by appropriate material properties as well as by flat, planar shapes in order to be able to rest coherently on the surface of the included primer.

The disadvantage of such a flat and level holding plate, however, lies in the limited possibility of being penetrated by twist nails at any angle, since the more twist nails deviate from a vertical drilling direction, the more they lead to a significant enlargement of the necessary mounting holes in the holding plate they oval or Assume slot-shaped openings or bores. Such expansions in area lead to a significant weakening of the entire holding plate statics.

the DE 36 07 930 A1 discloses spherical brackets, which are used in the formation of spread anchors, but are often only connected as a simple closing element with the end of a twisted rod in order to find support in a spherical socket so that an additional deflectable bracket can be attached to it .

In an alternative embodiment, the CN 202 900 295 U how a deflection ball is used, which makes it possible to fix a drill nail with variable alignment on the curved surface of a retaining plate by means of an additional element of the same curvature by means of a final threaded screw nut in the selected position through the smooth bore channel of a spherical holder.

However, with this technical design, the included drill nail can basically no longer be moved after its final positioning and the spherical holder can no longer exert any vertical movement influence on the included drill nail because the spherical holder is in its vertical drill tunnel a smooth inner coating on the drill nail.

The use of such a spherical holder has no significant function with this technology, because the free space that is necessary to integrate this spherical element in the curved retaining plates can also be used at any time to allow the twist nail included there extended alignment options without a sphere.

With this technical arrangement, the connection between the intermediate element and the threaded screw nut is sufficient to establish a firm connection between the retaining plate and the drill nail. The ball element is in this case no significant expansion of possible functions. Understandably, therefore, the attempt to stabilize the weakening of a drill nail holder spread in this way, for example by adding additional joint elements. Another generic drill nail holding system is from WO 2004/001192 A1 famous.

The invention is therefore based on the object of developing a spherical holder in such a way that a drill nail inserted therein finds a firm hold even if the insertion angle is inclined to the substrate, can be fixed in this angular position and can also be moved in its longitudinal direction after assembly.

The object on which the invention is based is achieved by the features of the independent claim, while advantageous configurations and developments of the invention can be found in the subclaims.

An essential feature is that a tensioning ball is fixed by an upper and a lower retaining plate and after loosening the tensioning screw attached to the retaining plate can be turned so that the twisted nail in the tensioning ball can be fixed again in an orientation deviating from the plumb line.

If the drill nail needs to be tightened later, the drill nail has a holding connector in the upper area that can be rotated together with the tightening ball. If the retaining connector is now rotated, an internal thread in the interior of the retaining connector acts on the external thread of the non-rotating drill nail, which thereby moves vertically downwards or upwards and migrates through the retaining connector and the ball.

With known ball mounts, even with normal threaded mounts, it is possible to use the threaded rod implanted there even afterwards Always turn the assembly vertically up or down, but only turn it, ie the threaded rod itself rotates in its direction.

However, this turning is prevented by the present invention with the tensioning technique according to the invention, in which a rotary movement is only exerted on the tensioning ball via a wrench so that a power transmission takes place on the drill nail, in which the drill nail in the sense of this force action without its own rotational movement in the longitudinal direction upwards or can dodge below.

Thus it is possible that the involved drill nail scratches the primer surrounding it through the contour of the thread profile and loosened primer material can fill any free spaces between the primer and drill nail.

Improved friction is restored and the drill nail is again securely anchored in the primer.

• Formtechnische Erweiterung standardisierter Halteplatten
• Einsatz der sog. Nachspannkugel
• Permanente Möglichkeit der Nachspannbarkeit mittels Mobilisierung der Mantelreibung zwischen Drillnagel und Grundierung

As a result, a retensionable drill nail holding system is possible, whereby the following three essential functional areas are possible in order to meet the safety requirements of geotechnical or general structural engineering requirements:

• Technical expansion of standardized retaining plates
• Use of the so-called tensioning ball
• Permanent possibility of re-tensioning by mobilizing the skin friction between drill nail and primer

For the present invention, a holding plate in a shell-shaped design is advantageously used, which by means of various variants of the shell shape can come from spherical elements or other geometric hollow shapes as a whole or in segments.

Such shell-shaped elements are primarily characterized by the fact that they not only partially contain the properties of a continuously flat holding surface, but also provide the possibility of twist nails deviating from the perpendicular vertical alignment, especially in their ascending shape manage with comparatively small holes in the retaining plate with a significant spread. In this way, twist nail inclinations are also possible, which cannot be achieved with conventional holding plates directed laterally.

Shell-shaped retaining plates or any segments derived therefrom can, of course, adapt to the irregularly shaped surfaces of included primers in some cases without the need to create an individual fit in advance of their assembly, for example through extensive earthworks. This also results in a wide range of options for connecting different shell shapes or segments to one another to form any conceivable functional units. A technical embodiment that is particularly required for geotechnical tasks such as "slope stabilization" or "coastal protection".

The technical possibilities of the retensioning ball according to the invention in the retensionable twist nail holder, in which the ball element used includes the option of a variable alignment of an incorporated twist nail, are quite different.

The main feature of this drill nail holder is that a movable ball element is located between at least two holding plates (also holding elements) and accommodates a drill nail. Regardless of the vertically specified orientation of the drill nail, it can also be moved vertically up or down at any time after its final insertion, without the To have to partially or completely dismantle the function of the drill nail holder.

This is achieved in that the tensioning ball is held by holding elements, which in turn are connected to one another by a screw connection.

These holding elements can be positively connected to the integrated tensioning ball in such a way that the tensioning ball can no longer be deflected in the selected orientation.

However, it is also possible to choose a free space between the two holding elements in such a way that only a minimal amount of free space (by loosening the screw connection) is created between the tensioning ball and the holding elements, which subsequently allows not only the tensioning ball contained therein to be removed from the To move adjacent holding elements, but also to transmit a rotary movement exerted on the tensioning ball to the drill nail integrated therein. This is done by simply turning the tensioning ball, with an internal thread located in it engaging the external thread of the drill nail and thus being able to move it up or down in the longitudinal direction.

This is only possible because the internal thread integrated in the tensioning ball corresponds in its diameter and pitch to the external thread of the drill nail.

The internal thread running through the tensioning ball continues in a holding stub located on the tensioning ball. Thus, there is a continuous thread through the retaining stub and tensioning ball or the retaining socket continues the thread of the tensioning ball.

Such a holding stub has a key attachment on which a tool can act in order to rotate the holding stub together with the tensioning ball connected to it.

The outer jacket of this wrench socket has a variable shape, which allows this wrench socket to be turned around an axial axis with a simple tool (e.g. open-ended spanner), that is the axis that also runs in the longitudinal direction through the drill nail.

If such a rotational movement is now exerted on the tensioning ball, its rotational movement would of course primarily follow the thread course of the integrated drill nail, a movement that, because the tensioning ball is restricted by two retaining elements, cannot lead to a vertical movement of the tensioning ball, but rather the twisting nail even as an evasive maneuver against the torsional forces or constraining forces acting on it, optionally executes a movement process in the longitudinal direction upwards or downwards without the drill nail rotating itself in this vertical movement sequence. A rotational movement of the retaining ball is thus transferred into a translational movement of the drill nail.

Another advantage of the present invention is the post-tensioning technique of the drill nail retaining element.

With the constant mobility of the drill nail, all the technical frame requirements are created to check the required functionality of such a drill nail holder by means of so-called re-tensioning of the drill nail, both during the initial assembly and subsequently by means of a so-called mobilization of the skin friction and any deviations from to adapt the desired position to the safety requirements.

The basis for this is the physical property of so-called skin friction, which arises when a drill nail (also similar screw elements) is inserted on its outer jacket in relation to the primer surrounding it, i.e. as a result of the relative movement between the primer and the drill nail jacket. This skin friction can be very variable and has priority depends on the material properties of the primer included, as well as any linear deviations in the vertical course of the drill nail.

With such a connection between drill nail and primer, there may be a different strength of skin friction over the length of the drill nail in some places during the initial assembly, which in some cases can result from the layering of different primer properties. Such deviations in skin friction can, however, also be partially or comprehensively minimized or intensified over a subsequent period of time due to geological faults within a primer or due to external weather influences. A change that cannot be perceived by simply looking at such a bracket.

It is also conceivable that in the case of a geotechnical construction of a drill nail holder, natural earth movements of the respective primer act on the longitudinal course with such forces that the original direction of the drill nail is deflected and, in the event of overload, a drill nail breaks off, or a direction of the drill nail that was originally associated with a rather low skin friction is reinforced in its durability by a slight curvature. Mechanical processes, the effects of which can only be assessed if they can be classified as relevant in terms of measurement technology.

With the twisting movement of the tensioning ball exerted by the wrench attachment, it is possible to move a drill nail in the longitudinal direction and to interpret the associated evasive movement at the free end of a drill nail as a direct result of skin friction using suitable measurement technology.

If it turns out during such a measuring process that the skin friction of a drill nail and thus its mechanical strength is too low, can by repeated up and down movements of the drill nail, even with small movements, the primer surrounding the drill nail is "scratched" by the roughness of its thread profile in such a way that the primer material released in the process collects in any free spaces between the drill nail and the primer, where it condenses the drill nail again Environment leads. The original hold of the drill nail in the primer is thus restored.

A safety-related process which is technically referred to as retensioning and which cannot be performed in this form by any previously known holding system.

• Figur 1: schematisierte Ansicht einer Haltekugel
• Figur 2: Schnittdarstellung einer Haltekugel
• Figur 3: Drillnagel-Haltesystem
• Figur 4: Schnittdarstellung Drillnagel-Haltesystem
• Figur 5: Schnittdarstellung obere und untere Halteplatte
• Figur 6: perspektivische Darstellung einer vergrößerten unteren Halteplatte
• Figur 7: Schnittdarstellung einer unteren Halteplatte
• Figur 8: Schnittdarstellung einer geknickten unteren Halteplatte
• Figur 9: Schnittdarstellung einer geknickten unteren Halteplatte mit Scharnier
• Figur 10: gebogene untere Halteplatte
• Figur 11: perspektivische Darstellung einer gewellten unteren Halteplatte
• Figur 12: perspektivische Darstellung einer ziehharmonikaartigen unteren Halteplatte
• Figur 13: Segmente einer unteren Halteplatte
• Figur 14: perspektivische Darstellung einer Sonderform der unteren Halteplatte
• Figur 15: perspektivische Darstellung zweier zusammengeschraubter unterer Halteplatten
• Figur 16: perspektivische Darstellung dreier zusammengeschraubter unterer Halteplatten
• Figur 17: an den Endbereichen zusammengeschraubte Halteplatten
• Figur 18a, b: kugelförmige untere Halteplatte
• Figur 19: becherförmige untere Halteplatte
• Figur 20: Segment einer gebogenen unteren Halteplatte

Show it:

• Figure 1 : schematic view of a retaining ball
• Figure 2 : Sectional view of a retaining ball
• Figure 3 : Drill nail retention system
• Figure 4 : Sectional view of drill nail holding system
• Figure 5 : Sectional view of the upper and lower retaining plate
• Figure 6 : perspective view of an enlarged lower holding plate
• Figure 7 : Sectional view of a lower retaining plate
• Figure 8 : Sectional view of a kinked lower retaining plate
• Figure 9 : Sectional view of a bent lower retaining plate with hinge
• Figure 10 : curved lower retaining plate
• Figure 11 : perspective view of a corrugated lower retaining plate
• Figure 12 : perspective view of an accordion-like lower retaining plate
• Figure 13 : Segments of a lower holding plate
• Figure 14 : perspective view of a special form of the lower retaining plate
• Figure 15 : perspective view of two screwed together lower retaining plates
• Figure 16 : Perspective representation of three screwed together lower retaining plates
• Figure 17 : retaining plates screwed together at the end areas
• Figure 18a , b: spherical lower retaining plate
• Figure 19 : cup-shaped lower retaining plate
• Figure 20 : Segment of a curved lower retaining plate

Figure 1 shows the tensioning ball 1 of the twist nail holding system according to the invention, a holding stub 3 being welded onto a spherical body 2 in the example shown here.

The invention is not limited to this, however, since the tensioning ball 1, consisting of a spherical body 2 with a holding stub 3 attached to it, can also be manufactured as a one-piece component, for example in a casting process.

In the example shown here after Figure 1 the holding stub 3, similar to a hexagon nut, has outer contact surfaces 7 on which a tool can act. Such a tool is used to rotate the retensioning ball about an axis of rotation running through the holding connector and the spherical body 2.

On such a support stub Figure 1 with a hexagon shape, the present invention is not limited. Any shape of a holding stub is claimed with the present invention. For example, the holding stub 3 can have only three contact surfaces or any other profiling that enables a separate tool to act in order to rotate the tensioning ball.

The holding connector 3 has a thread 4, in which a drill nail or the thread of a drill nail can be received according to the following figures.

Figure 2 shows the sectional view of the tensioning ball 1 according to the invention with the holding stub 3 to which the spherical body 2 is connected.

The holding stub 3 has an internal thread 4 which, in the example shown here, only extends as far as the contact point of the holding stub with the spherical body 2 below.

In the spherical body itself there is only one bore 28 in extension of the thread 4, through which the drill nail inserted later is passed.

The invention is not limited to this, however, since the thread 4 can also extend through the spherical body 2 in order to be able to ensure thread engagement between the tensioning ball and the later inserted drill nail over the entire length of the tensioning ball.

The axis of rotation 5 runs through the center of this thread 4, around which the tensioning ball can rotate in the direction of the arrow 6 when a tool engages the engagement surfaces 7.

Due to the thread engagement of the thread 4 on a twist nail thread 16, the twist nail 15 is conveyed through the tension ball in the direction of arrow 8 when the tensioning ball 1 rotates about the axis of rotation 5. The rotational movement of the tensioning ball 1 is thus transferred into a transitory movement of the drill nail 15.

Figure 3 shows the drill nail holding system according to the invention, which includes the aforementioned tensioning ball 1.

In the holding connector 3 of the tensioning ball 1 is in the example according to Figure 3 a drill nail 15 inserted. The spherical body 2 of the tensioning ball 1 is clamped between two retaining plates 9 and 10.

The upper holding plate 9 has an opening 12 through which the spherical body 2 protrudes partially from the holding plate 9. However, this opening 12 is smaller than the diameter of the spherical body 2. In the same way, but not visible in FIG Figure 3 , the spherical body 2 protrudes from the lower holding plate 10 with an opening also made there. The two holding plates 9, 10 are screwed to one another via four screws 13 which cooperate with corresponding nuts 14.

The twist nail 15 has the external thread 16, which corresponds to the thread 4 of the tensioning ball 1. If a rotary movement is now transmitted to the holding connector 3 of the tensioning ball 1 by a separate tool, the drill nail 15 moves in the direction of arrow 8 due to the thread engagement.

Figure 4 shows the representation after Figure 3 in sectional view, it being possible to see that the twist nail 15 is in thread engagement with the thread 4 over the entire length of the tensioning ball 1.

In this embodiment, the spherical body 2 of the tensioning ball 1 thus also has a continuous thread 4.

Figure 5 shows the upper holding plate 9 and the lower holding plate 10 in a sectional view, the holding plate 9 having an opening 12 and the lower holding plate 10 having an opening 22.

Between the holding plates 9, 10 there is a gap 11 which, depending on the size of the inserted spherical body, can be of different sizes. Starting from the gap 11, the opening 12 in the upper holding plate 9 tapers towards the outside. The opening 22 of the holding plate 10 also tapers outwards, starting from the gap 11.

The inner edges 26 of the opening 12 of the upper holding plate 9 form an angle 17 to one another in the example shown here. The inner edges 25 of the opening 22 of the lower holding plate 10 also form an opening angle 18.

This shape with the outwardly tapering openings enables an inserted tensioning ball 1 to be held between the two retaining plates 9, 10. Depending on the geometric shape of the tensioning ball, which can also be designed as a polyhedron, the edges 25, 26 of the retaining plates 9, 10 are designed to fix the tensioning ball 1 so that it cannot fall out of the openings 12, 22. Thus, the edges 25, 26 can also be curved or have a different geometric shape.

The gap 11 is also variable and can be made larger or smaller depending on the size of the tensioning ball 1. The two retaining plates 9, 10 are then, for example, by the in Figure 4 shown screw-nut connection 13, 14 held together.

Such a screw connection of the individual retaining plates with one another serves to fix the tensioning ball in a desired position inside the retaining plates 9, 10. For example, the tension ball 1 with its twist nail 15 can assume an angle deviating from the vertical direction in order to drive the twist nail 15 obliquely into the ground. With this device, twist nails can thus be driven obliquely into the ground in a lower holding plate 10 resting on the ground, ie at an angle smaller than 90 ° with respect to the lower holding plate 10. For this purpose, the tensioning ball 1 remains movable between the holding plates 9, 10 until the pivoting nail 15 has assumed the correct angle and after the tensioning ball has been aligned and the twisting nail 15 has been inserted into the ground, the tensioning ball is moved between the two holding plates via the screw Nut connection 13, 14 fixed so that this angle is set permanently.

If it is necessary to retighten the twist nail 15 at a later point in time, the screw connection 13, 14 is released so that the retensioning ball 1 is released again and can be rotated. Then a rotary movement is exerted on the tensioning ball 1 with a tool via the holding connector 3 and the drill nail 15 is driven upwards out of the ground or down into the ground, depending on the direction of rotation.

Figure 6 shows a further embodiment of the invention, the upper holding plates 9 already shown in the previous figures being applied to a greatly enlarged lower holding plate 10a. This holding plate 10a enables, for example, two upper holding plates to be attached and is characterized by a larger contact surface on the ground.

For screwing the upper holding plate 9 onto the lower enlarged holding plate 10a, the upper holding plate 9 has bores 19 which correspond to bores made in the lower holding plate 10a and through which the screws 13 can be inserted.

Figure 7 shows the in Figure 6 Holding plate 10a shown in sectional view, the lower holding plate 10 having two openings 22 with inclined edges 26. These edges 26 taper downwards so that a tensioning ball 1 inserted into the holding plate 10 cannot fall out downwards.

Figure 8 shows a further embodiment, wherein the lower holding plate 10a is bent in the middle and the two legs extending therefrom have an opening angle 20 between them. The legs each have an opening 22 into which the tensioning ball can be inserted. The left leg shows the alignment of a drill nail 15 by way of example.

Figure 9 shows a continuation of the curved retaining plate 10a, a joint 21 being arranged between the two legs of the lower retaining plate, with which the opening angle 20 is variable and the legs can be moved in the directions of the arrows 30, 31.

Figure 10 shows a further embodiment, wherein the lower holding plate 10a is bent and the openings 22 are arranged at different areas of the bends. As a result, the drill nail 15 from the ground up already experiences an orientation deviating from the horizontal when it follows the lower holding plate 10a in a curved region Figure 10 is arranged.

These bends make it possible to drive the drill nail 15 into the ground at different angles.

Figure 11 shows a further embodiment of an enlarged lower holding plate 10a, this being of a corrugated design and being able to be arranged in the openings 22 in the corrugation troughs 32 or in the corrugation peaks 33.

As a result of this different arrangement of the openings 22, the edges 26 (cf. Figure 5 ) occupy a different length and / or a different opening angle 18 to one another. For example, it can be that the opening 22 is arranged in a crest 33 and the edge 26 pointing in the direction of the trough 32 is shorter than the edge 26 which is adjacent in the direction of the tip of the crest 33.

Figure 12 shows a further embodiment, wherein the lower enlarged retaining plate 10a is folded like an accordion and thus, depending on the arrangement of the openings 22, the angle of the drill nail 15 can also be influenced.

Figure 13 shows a further embodiment of a curved retaining plate 10a which, depending on the opening angle 23, is divided into different segments and can be separated, for example, depending on the topographical nature of the subsoil.

Figure 14 shows a further embodiment of the invention, wherein the lower holding plates 10b join together to form a cup matrix. Such a cup matrix is subdivided similarly to the ice cube container of a freezer compartment, but the holding plates 10b at the base of the individual cups converge towards one another in a pointed manner.

Such a cup matrix enables the acute angles formed by the lower holding plates 10b to be pressed into the ground when a force is exerted on the tensioning ball.

In addition, you are not limited to individual openings in the lower retaining plate, but can choose the respective opening in the cup matrix in order to drive a drill nail through the tensioning ball.

Figure 15 shows a further embodiment of the invention, two band-shaped, elongated lower retaining plates 10a being screwed to one another via a screw connection 24.

These two lower retaining plates 10a screwed together thus form an anchor which can be placed on the ground.

Figure 16 shows a continuation of Figure 15 , with three band-shaped lower retaining plates 10a being screwed to one another via a screw connection 24. It is thus possible, depending on the nature of the subsurface and the desired holding force between drill nail and subsurface, to screw different retaining plates together and, if necessary, to expand this anchor thus formed with any further retaining plates 10a.

Figure 17 shows a continuation of Figure 15 , wherein two band-shaped lower retaining plates 10a are also connected to one another via a screw connection 24 are connected, but the retaining plates lie lengthways, ie over a distance on the ground.

The tensioning balls with twist nails 15 can then be inserted into the respective opening 22.

Figure 18a shows a further embodiment of a lower holding plate 10c, this being spherical. The retaining balls with twist nails 15 can be inserted through the openings 22, which are arranged in the outer shell of this hemisphere.

For better fixation of the lower retaining plate 10c on the ground, mandrels 27 are provided, which ensure that the lower retaining plate 10c is fixed on the ground before screwing in the drill nail 15 so that the hemispherical lower retaining plate cannot slip.

Figure 18b shows a further embodiment according to Figure 18a , the hemisphere being elliptical and also having spikes 27.

Figure 19 shows similar to Figure 14 a cup-shaped lower holding plate 10b, but the sides of the cups do not form an acute angle between them. Rather, mandrels 27 are attached to the bottom of this cup, which are used to fix the lower retaining plate before screwing the drill nails to the ground.

The sides of the cup-shaped lower retaining plate 10b can then be inserted into the openings 22, the tensioning balls together with the twist nails 15.

Figure 20 shows a further embodiment of a curved lower retaining plate 10a which also have spikes 27 for fixing on the ground.

The present invention is characterized by the fact that a tensioning ball is fixed by an upper and a lower holding plate and can be rotated after loosening the tensioning screws attached to the holding plate so that the drill nail can be fixed again in an orientation deviating from the perpendicular direction.

In a further embodiment of the invention, such an alignment can be read from a marking attached to the tensioning ball, which represents a measurement of the upper retaining plate.

If the drill nail needs to be tightened at a later date, the tightening ball has an integrally formed holding connector in the upper area, which can be rotated together with the spherical body.

If the retaining stub is now rotated, an internal thread acts on the external thread of the non-rotating drill nail, which can thereby move upwards or downwards in the longitudinal direction. A rotary movement of the tensioning ball is thus converted into a translational movement of the drill nail.

Drawing legend

• 1. Retensioning ball
• 2. spherical body
• 3. Holding stubs
• 4. Thread
• 5th axis of rotation
• 6. Direction of arrow
• 7. attack surface
• 8. Direction of arrow
• 9. Upper retaining plate
• 10.Lower retaining plate (10a, 10b, 10c)
• 11. gap
• 12. Opening
• 13. screw
• 14. Mother
• 15. Drill nail
• 16.Thread (of 15)
• 17. Opening angle
• 18. Opening angle
• 19th hole
• 20. Opening angle
• 21. joint
• 22. Opening
• 23. Angle
• 24. Screw connection
• 25. Edge
• 26. Edge
• 27. Thorn
• 28th hole
• 29.-
• 30. Direction of arrow

Claims (10)

1. Holding system for a twist nail consisting of a movable spherical body (2) which receives within it a twist nail (15) having a thread (16) and is arranged in an opening (22) of a holding plate (9, 10, 10a, 10b, 10c), characterised in that the spherical body (2) is held by an upper holding plate (9) and a lower holding plate (10) and has a holding connection with a thread (4), by means of which a rotary movement applied to the holding connection (3) is transferrable to the thread (16) of the twist nail (15).
2. Holding system for a twist nail according to claim 1, characterised in that the holding plates (9, 10, 10a, 10b, 10c) are connected to one another via a screw connection (13, 14).
3. Holding system for a twist nail according to claim 1 or 2, characterised in that the holding connection (3) has working surfaces (7) distributed on the circumference to work with a tool.
4. Holding system for a twist nail according to one of claims 1 to 3, characterised in that the holding connection (3) and the spherical body (2) connected thereto are rotatable about a rotational axis (5) running through the thread (4).
5. Holding system for a twist nail according to one of claims 1 to 4, characterised in that the thread (4) runs through the spherical body (2).
6. Holding system for a twist nail according to one of claims 1 to 5, characterised in that the upper holding plate (9) has an opening (12), through which the spherical body (2) projects partly from the upper holding plate (9).
7. Holding system for a twist nail according to one of claims 1 to 6, characterised in that the lower holding plate (10, 10a, 10b, 10c) has at least one opening (22) for receiving the spherical body (2).
8. Holding system for a twist nail according to one of claims 1 to 7, characterised in that the lower holding plate (10, 10a, 10b, 10c) is bent or folded.
9. Method for using a holding system for a twist nail according to claims 1 to 8, characterised in that the one retightening sphere (1) consisting of a holding connection (3) and a spherical body (2) is fixed by the upper holding plate (9) and the lower holding plate (10, 10a, 10b, 10c) and can be twisted after loosening of screw connections (13, 14) attached to the holding plates (9, 10, 10a, 10b, 10c) so that the twist nail (15) passed through the thread (4) of the retightening sphere (1) can be fixed again in an orientation differing from the vertical direction.
10. Method according to claim 9, characterised in that when the holding plates (9, 10, 10a, 10b, 10c) are loosened, a rotary movement exerted on the holding connection (3) about a rotational axis running through the thread (4) forces the thread (4) into the outer thread (16) of the non-rotating twist nail and transfers the rotational movement of the retightening sphere (1) into a translational movement of the twist nail (15).

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