WO2013120746A1

WO2013120746A1 - Fastening anchor and fastening system with fastening anchor

Info

Publication number: WO2013120746A1
Application number: PCT/EP2013/052336
Authority: WO
Inventors: Jürgen Bergfelder
Original assignee: Bergfelder Grundbesitz Gmbh & Co. Kg
Priority date: 2012-02-15
Filing date: 2013-02-06
Publication date: 2013-08-22
Also published as: DE202012001547U1

Abstract

The invention relates to a fastening anchor (10) which can be fixed in a form fitting manner in a recess (A) of a component (T) to be fastened, and a fastening system (B) having the fastening anchor (10). The basic form of the fastening anchor (10) is designed as a hollow-cylinder-type expansion dowel that is longitudinally segmented in a rear end region (2.1) into individual expanding elements (4) that can be expanded radially relative to an insertion direction (e). The expanding elements (4) each have a cutting projection (12) extending radially outward in relation to the insertion direction (e), said cutting projection having a cutting edge (13) arranged on the radial exterior which, when the expanding elements (4) expand radially outwards, embeds itself in a wall (W) of the component (T) delimiting the recess (A) in a form fitting manner in a fastening position.

Description

Fixing anchor and fastening system with

fastening anchor

The invention relates to a fastening anchor which can be fixed in a form-fitting manner in a recess of a component to be fastened, such as a panel for wall cladding, wherein the fastening anchor has a hollow-cylinder-like expansion dowel in the basic shape with a rear end region in the recess provided in an intended insertion direction radially spreadable to the insertion direction

Spreizelemente is longitudinally segmented. The invention further relates to a fastening system with the fastening anchor.

Generic fastening anchors can be clamped, for example dowel-like in the recess, which can lead to an unfavorable radial pressure load on the wall of the plate and / or in particular for softer plates to a loosening of the fastening anchor in the recess.

In EP 0 336 183 A2 and DE 93 06 937 U each trained as an undercut anchor fastening anchor is described to avoid unfavorable radial compressive load form-fitting only in one

Undercut of an undercut recess engages. This is more suitable for plates made of a stronger material, such as natural stone or concrete. For plates with

lower strength can be at already lower

Loads carried out a release of the undercut anchor.

The object of the invention is a generic

Mounting anchor provide the mountable by reducing the radial pressure load on the wall of the recess and yet under a tight fit in the recess is.

The stated object is achieved by the

Characteristics of claim 1 solved. advantageous

Further developments are described in the subclaims. The stated object is already achieved in that the spreading elements in each case one to the insertion direction radially outwardly extending cutting edge projection with a radially outer cutting edge for positive locking

Cutting the cutting projection radially outward in a wall bounding the recess of the component to be fastened under spreading of the spreading radially outward into a mounting position inside.

The cutting edge projection is designed in one

Cutting direction radially outward into the wall

cut, or in particular a wall of soft material to dig into the same. With the cutting of the cutting projection in the wall of the recess, an undercut is produced to the recess in which the cutting projection in the fastening position rests positively. Since the cutting edge projection the

Produced undercut, the undercut is the same shape with the cutting edge projection, so that a particularly tight fit of the cutting edge projection and thus the fastening anchor is ensured in the recess. It is obvious that such a fastening anchor is suitable for soft to medium-hard material, so that the cutting edge projection

easily cut into the wall and can dig into the wall.

Preferably, the spreading elements extend in the

Fastening position in the longitudinal direction of

Fixing anchor. The cutting projections can thus protrude radially outward in the fastening position. The rear end region with the expansion elements can thus in the attachment position in the amount of cutting edge projections Have diameter greater than that of the recess. To reduce the diameter, the spreading before

Insert into the recess radially inwards into one

Provided bent position in which they are inserted into the recess into it. This can be the

Bent radially inward purely elastic, but preferably done plastically. It can thus be the spreading elements in the ready position for insertion of the

Fixing anchor in the recess in radial adaptation to the same to be bent radially inwardly. Of the

Expansion dowel may preferably stop limit up to a certain height in the direction of insertion into the recess

be used. Upon reaching this height, the spreading can by introducing a bending moment

preferably end of the spreading of the

Provision position in the attachment position

be bent into it. In this case, the cutting projections can cut radially into the wall or dig in to form the undercut. To fix the fastening anchor in the recess, the

Spreading elements in the recess of the

Provision position in the mounting position into radially outwardly spread so arranged that the spreading elements are arranged at least approximately parallel to the longitudinal direction of the fastening anchor.

In terms of manufacturing technology, the expansion elements can extend parallel to the longitudinal axis after production.

Kraftmechanisch favorable, the cutting edge projection in

Insertion be arranged behind the associated spreader.

The cutting projection can be designed to converge outwardly over its radial extension to the cutting edge. Thus, the cutting edge projection does not have a shape crack, which is a slight penetration of the Cutting edge would counteract in the wall of the recess.

Preferably, the cutting projection is formed prismatic to the cutting edge converging. Of the

Cutting edge can be a front in the direction of insertion

Flank and a rear insertion in the direction of insertion. These can be radially outward to form the

Cutting edge together. Here, the front edge may be arranged inclined in a first cutting angle to the radial direction. This first cutting angle may be in the range of 5 ° to 30 °, preferably 8 ° to 20 °, or more preferably 10 ° to 15 °

exhibit. An ideal first cutting angle depends, among other things, on the material of the wall. Depending on the size of the first cutting angle may also be an excavation work that must be applied to tear the fastening anchor out of the recess with at least partial destruction of the recess. The spreading of the spreading radially inward and / or radially outward, as already described, under

Bend the spreading done. With the introduction of a required bending moment in the direction of insertion in the back into the spreading elements is the foot side of the spreading elements, i. in the insertion direction forward, generates a maximum bending moment in the expansion elements. This can be done with the introduction of

Bending moment at the foot of the spreading a maximum bending thereof in the radial direction. Thus, the radial spread of the spreading with respect to the

Cutting projections are interpreted as pivoting on a circular path. So that the cutting edge projection with this pivoting radially outward easier in the

Wall can penetrate, the rear edge is inclined at a second cutting angle to the radial direction. The second cutting angle may have an amount in a range of> 0 ° to -S 10 °, or preferably from> 1 ° to -S 7 °. An ideal second cutting angle, for example, on the length of the spreading in

Depending on the diameter of the recess and / or depend on the material of the wall of the recess. An ideal angle range of> 10 ° to -15 ° can occur.

The greater a radial extension of the cutting projection, the deeper the cutting projection can engage in the wall of the recess. A value of the optimal radial extension of the cutting edge projection may depend inter alia on the material of the wall of the recess, that is, the softer this material is and / or the easier an incision can be made in the same by means of the cutting edge projection, the higher the radial extent of the Cutting edge are selected, but advantageously without incising a higher mechanical stress on the recess outside the range of engagement of the cutting edge projection into the wall to produce. Constructively, a maximum extension can then be limited by the diameter of the recess when the expansion elements, as described above, are bent radially inward for insertion into the recess because of the protruding cutting edge projections. For example, here are three or more

Spreading provided so they can with their

Bend radially inwards in the direction of insertion in the middle. In this case, the maximum radial extent of the expansion elements in the amount of

Cutting projections equal to the radius of the recess, be less than the radius of the recess in plastic bending of the expansion elements corresponding to an elastic bending part in the plastic bending.

Especially with larger diameters of the recess, it may be longer because of the constructive condition

Cutting edge of the cutting edge projection with respect to mechanical load on the wall during the incision of the cutting projection in the same be cheaper to choose a smaller radial extent of the cutting edge projection. The radial extension of the cutting edge projection and the inner radius of the rear end region of the

Mounting anchors can be a ratio radial

Form extension / inner radius, which is 1/6 to 1/1,

preferably from 1/5 to 2/3 and ideally from 1/4 to 1/2. The rear end region of the expansion anchor can by means of two preferably perpendicular to each other

Central cuts to be segmented into four expansion elements. The spreading elements can thus be arranged axially symmetrical to the longitudinal axis of the expansion anchor. This allows the expansion dowel as a precursor without the

Center longitudinal cuts in the rear end of the

Having cutting projection as a circumferential projection, which is segmented with segmentation of the expansion elements.

The fastening anchor can in a preferred

Embodiment for spreading the spreading elements from the ready position into the fastening position and for the radial abutment of the expansion elements in the mounting position have a bolt element. The hollow cylinder-like expansion anchor can as a

Having passage opening formed central opening.

The bolt element can be introduced in the insertion direction into this opening, preferably stop-limited. Reaches the bolt in the direction of insertion in

Provision position located spreading, so he can attack with further introduction in the insertion direction radially inward under the introduction of a moment of force radially outward on the spreading, which are thereby spread radially outward.

It is preferably provided that the bolt element stop limit so far in Einsetzrichtung in the

Expansible plug is inserted until it is arranged with its end side face in alignment with the end faces of the expansion elements. With spreading of the spreading, the associated cutting projections can in the wall of the

Cut in the recess. With the cutting is also an undercut in the recess generated, the one

Removes removal of the fastening anchor against insertion direction. For easier spreading of the spreading elements, they can each have a predetermined bending point in the direction of insertion in front of the cutting projection. This predetermined bending point as

Weak point in the bending strength curve of the spreading over the length thereof may be formed so that the bending of the expansion elements during their spreading takes place at least almost exclusively at the predetermined bending point. Thus, the spreading can practically at the desired bending point

be pivoted and this her stretched shape

maintained. This can apply to a radial spread inwards and outwards.

Preferably, the predetermined bending point is provided at the foot end of the spreading elements. This means that the

Sollbiegestelle directly in the field of

Spreading elements may be arranged, on which the

Spreading elements are connected to the other expansion dowel.

This is also a force-mechanically favorable point, since, at endstirnseitig initiated radial force, here a maximum bending moment acts.

The fastening anchor can with the recess

Form fastening system, wherein the fastening anchor with cutting of its cutting projections creates an undercut in the recess. The fastening anchor can thus be determined with the following steps in the recess: Inserting the expansion anchor of the fastening anchor into the recess up to a certain height,

Spreading the spreading, for example by means of an inserted into the opening of the expansion anchor

Bolt element under cutting or digging the

Cutting projections in the wall of the recess until the spreading elements are in the mounting position.

In the attachment position, the spreading elements preferably extend parallel to the wall of the

Recess so that only the cutting edge projections

effective at the bez. engage in the wall of the recess. Thus, the rear end portion of the

Expansion dowel a smaller diameter than that of

Have recess. In this way, the lateral pressure on the wall of the recess can locally be strongly limited to the area of the cutting edge projections and thus limited to a minimum value. It can be minimized due to a risk of possible breakout of the anchor under certain circumstances damaging lateral compressive stress on the wall of the recess. This is particularly advantageous in thin plates to be fixed.

The expansion anchor can be a front in the insertion direction

Have end region. It can protrude in the mounting position with the rear end portion on the recess. For example, the expansion dowel can be designed as a collar dowel with a collar, wherein the collar in the

Fixing position, the recess can strike radially across the front in the direction of insertion on the component. The front end portion of the expansion anchor and / or the front end portion of the bolt member may respectively

Having connecting elements for connection to mounting structures and / or tool engagement. The bolt element can be designed as a threaded bolt with a first external thread provided in a rear end section in the insertion direction. Accordingly, the

Expansion dowel preferably at least in its rear

End region have an internal thread that the

Thread engagement with the first external thread of the

Bolt element is designed. The thread engagement of

Bolt element and expansion dowel reduces a possible

Load on the recess. As an alternative to the bolt element, the fastening system can additionally be designed such that the recess is provided on the sole side with a sole cone. The

Spreading elements can end together a matched to the sole cone preformed conical return to the end-side sliding of the expansion elements on the

Sole cone under radial spread of the same have. Thus, the spreading can be spread on the sole cone, by with their conical return with

Slip insertion into the recess. The present invention will be described below with reference to several embodiments of the fastening anchor or fastening system shown in a drawing

Fixing anchor described. In the drawing show:

Fig. 1: a side view with partial longitudinal section of a first

Embodiment of an expansion anchor in one

Fixing position for a fixing anchor,

2 shows a side view of a bolt element for

Insertion into the expansion dowel,

3 shows a detail of the expansion anchor according to the

Section III in Fig. 1,

4a: a side view with partial longitudinal section of the first

Embodiment of the expansion anchor according to FIG. 1, However, in a supply position in a recess in a component to be fastened, a side view with partial longitudinal section of a second embodiment of the expansion anchor in the provision position in the recess and

FIGS. 5a to 5c: in each case a side view with

Partial longitudinal section of a fastening system with

Fixing anchor and recess in the component to be fastened, showing a determination of the fastening anchor in three steps.

In Fig. 1 a first embodiment of an expansion anchor 1 is shown in a side view with partial longitudinal section.

This is used in a recess formed here as a blind hole A of a component to be fastened B in an insertion direction e and fixed there. Of the

Expansion dowel 1 has an e in the direction of insertion

End region 2.1 on, here by means of two perpendicular

mutually standing central longitudinal incisions 3 in four

Spreading elements 4 is segmented. The expansion anchor 1 has a substantially hollow cylindrical shape with a

central opening formed as a passage opening 5.

In Fig. 2 is a side view of a here as

Bolt 7 trained screw 6

shown, the one in the insertion direction e back

End section 8.1 having a first external thread 9.1 and a front end in the insertion direction eighth 8.2 with a second external thread 9.2. Expansion dowel 1 and

Bolt 7 form in the figures shown here a fastening anchor 10, which, as shown in Fig. 5c, together with the recess A forms a fastening system B. For this purpose, the screw bolt 7 is inserted in the insertion direction e in the opening 5 of the expansion anchor 1 and engages with its first external thread 9.1 in a in the opening 5 of the expansion anchor. 1 provided internal thread 11 a (Fig. 5c). Bolt 7 and expansion dowel 1 have in the mounting position on a common longitudinal axis 1.

The spreading elements 4 have in the insertion direction e behind each a cutting projection 12 which extends radially outward to form a radially outer

Cutting edge 13 extends by an amount a. This amount a forms with half the diameter d of the rear

End region 2.1 without cutting projection 12 in the embodiments of the expansion anchor 1 shown here

Ratio 2a / d of about 1: 3 (Figure 1).

Fig. 1 shows the expansion anchor 1 in the form again, in which it is made with still unexpanded expansion elements and in which it is after prior radial spread inward and radial spread outwards in one

Fixing position is located in the recess A (Fig. 5b). Here, the spreading elements 4 extend in the direction of the longitudinal axis 1 of the expansion anchor 1. To the

projecting cutting projections 12 in the insertion direction e in the recess A to be able to be

Spreading elements 4 bent radially inwardly, as pure

is shown schematically in Figures 4a and 4b. Inserted into the recess A is inserted into the screw 6 in the opening 5, which engages with its first external thread 9.1 in the internal thread 11 of the expansion anchor 1 and with further screwing in the expansion anchor 1 the

Spreading elements 4 in the insertion direction e bends radially outward. These intersect in turn by means of their

Cutting projections 12 in the recess A defining wall W to form an undercut H in the wall W, by means of which the expansion dowel 1 and thus the fastening anchor 10 axially in the recess A.

is fixed (Fig. 5c).

As can also be seen from FIG. 5, the diameter of the rear end portion 2.1 of the expansion anchor, except for the area with the cutting edge projection 12, in the

Fixing position smaller than that of the recess A. The rear end portion 2.1 is arranged in the mounting position of the fastening anchor 10 except for the cutting edge 13 engaging with the cutting edge 12 parallel spaced from the wall W of the recess A. This is locally highly limited, only on the cutting edge projection 12 a lateral pressure on the wall W exerted. The cutting projection 12 has a front flank 14.1 in the insertion direction e and a flank 14.2 rear in the insertion direction e, which converge radially outward to the cutting edge 13. The front edge 14.1 forms with a radial direction r a first angle ßl here

exemplary is about 20 °. Correspondingly, the rear flank 14.2 with the radial direction r encloses a second angle β2, which is approximately 5 ° by way of example here. The first angle .beta .. is designed for a relatively soft wall W, in order to cause the largest possible excavation work when breaking out of the fastening anchor 10 from the recess A and thus to bring about the most secure seating of the fastening anchor 10 in the recess A. The second angle ß2 serves primarily to the cutting edge 14 with the spreading of the spreading elements 4, the one

Pivoting the spreading elements 4 at the respective

Base point 15 equals as low friction in the

Wall W to penetrate.

For easier spreading or pivoting of the spreading elements 4 is the foot side of the spreading elements 4 each one

Predetermined bending point 16 is provided. The predetermined bending point 16 is in this case designed so that the bending and thus practically a pivoting of the expansion elements 4 takes place at the base point 15 thereof. This has the advantage that the shape of the spreading elements, which is stretched out of the way of manufacture, 4 after the spreading radially inward in the

Provision position in and their spread radially outward in their attachment position at least almost maintained. The predetermined bending point 16 is here as a cross-sectional taper in the form of a groove 17 with a round

Cross section introduced. This groove 17 is from

Manufacturing process of the expansion anchor 1 introduced before introducing the central longitudinal incisions 3 in the rear end portion 2.1 as a circumferential annular groove 17. The insertion of the expansion anchor 1 in the recess A and the bolt 7 in the opening 5 of the expansion anchor 1 respectively in the insertion direction e, as shown in FIG. 5 clearly removable, each stop limited by the expansion dowel 1 in

Insertion direction e front edge of the recess A on the component T and the bolt 7 at the edge of the opening 5 in the insertion direction e at the front of the expansion anchor 1 strike.

The expansion anchor 1 has in a direction of insertion e front end portion 2.2 as a stop collar 18, which in the mounting position, the recess A in

Insertion direction e overlaps front. Furthermore, what is not specifically shown here, the collar 18 on two radially opposite areas outside the

Attack flattened laterally on a not shown here tool. Thus, the expansion anchor 1 after his

Insertion into the recess A (Fig. 4a and b) are held rotationally in the recess A in order to screw the bolt 7 in the opening 5 of the expansion anchor 1 trouble-free.

The bolt 7 has in its front end portion 8.2 a tool opening 19, here for here an Allen key, not shown here, on, over which the bolt 7 can be screwed into the opening 5 of the expansion anchor 1. About the second external thread 9.2 of the bolt 7 is a connection option for not shown here Attachment structures provided.

Fixing anchor and fastening system with

fastening anchor

Reference list 1 Expansion dowel

2.1 rear end area

2.2 front end area

3 central longitudinal incision

4 spreading element

5 opening

6 cutting edge projection

7 bolts

8.1 rear end section

8.2 front end section

9.1 first external thread

9.2 second external thread

10 fixing anchors

11 internal thread

12 cutting edge projection

13 cutting edge

14.1 leading edge

14.2 behind flank

15 footstep

16 predetermined bending point

17 round groove

18 collars

19 tool opening

a amount

e insertion direction

1 longitudinal axis

r radial direction A recess

B fastening system

H undercut

T component

W wall

ßl first angle ß2 second angle

Claims

Fixing anchor and fixing system with fixing anchor claims

1. fastening anchor (10), which in a recess (A)

a component to be fastened (T), such as a plate for wall cladding, can be fixed in a form-fitting manner, wherein the fastening anchor (10) has a basic shape

Hollow cylinder-like expansion dowel (1) with a in an intended insertion direction (e) in the recess (A) rear end portion (2.1) which in individual radially to the insertion direction (e) spreadable

Spreizelemente (4) is longitudinally segmented, that is, that the spreading elements (4) each one to the insertion direction (e) radially outwardly extending cutting edge projection (12) with a radially outer cutting edge (13) for

interlocking cutting edge projection (12) radially outwardly into a wall (W) of the component to be fastened bounding the recess (A)

(T) with spreading of the spreading elements (4) radially outward into a mounting position inside.

2. fastening anchor (10) according to claim 1, d a du r c h

That is, the cutting projection (12) is continuous with respect to its radial extent (a)

Cutting edge (13) converges.

3. fastening anchor (10) according to claim 1 or 2,

It is not possible that the

Cutting projection (12) prismatic to the cutting edge (13) converges.

4. fastening anchor (10) according to one of claims 1 to 3, characterized in that the

Cutting projection (12) has a front flank (14.1) in the insertion direction (e) and a rear flank (14.2) in the insertion direction (e), which converge radially outward to form the cutting edge (13), the front flank (14.1) in a first

Cutting angle (ßl) to the radial direction (r) is arranged inclined.

5. fastening anchor (10) according to claim 4, d a du r c h

e, that the first cutting angle (β1) is an amount in the range of 5 ° to 30 °,

preferably from 8 ° to 20 ° or from 10 ° to 15 °

having .

6. fastening anchor (10) according to claim 4 or 5,

characterized in that the rear edge (14.2) is inclined in a second cutting angle (ß2) to the radial direction (r).

7. fastening anchor (10) according to claim 6, d a du r c h

There is no such thing as the second

Cutting angle (ß2) has an amount in the range of 0 ° to 10 °, preferably from 1 ° to 7 °, or ideally from 2 ° to 4 °.

8. fastening anchor (10) according to one of claims 1 to 7, characterized in that the

Cutting projection (12) has a radial extent and the rear end portion (2.1) of the expansion anchor (1) have a radius, wherein these form a ratio radial extent / radius, the 1/6 to 3/4, preferably from 1/5 to 2 / 3 and ideally from 1/4 to 1/2

is.

9. fastening anchor (10) according to one of claims 1 to 8, characterized in that the cutting projection (12) in the insertion direction (e) at the rear of the respectively associated expansion element (4) is arranged.

10. fastening anchor (10) according to one of claims 1 to 9, characterized in that the

Spreading elements (4) in a ready position for insertion of the expansion anchor (1) in the recess (A) in radial adaptation to the same radially inwardly

bent to each other and fixing the expansion anchor

(1) in the recess (A) from the

Provision position are arranged so spread apart in a mounting position radially outwardly that the spreading elements (4) at least approximately parallel to the longitudinal axis (1) of the expansion anchor (1) are arranged.

11. fastening anchor (10) according to one of claims 1 to

10, characterized in that the rear end region (2.1) by means of two mutually perpendicular central longitudinal cuts (3) in four

Spreading elements (4) is segmented.

12. fastening anchor (10) according to one of claims 1 to

11, characterized in that it comprises a bolt element (7) for the spreading of the spreading elements (4) from a ready position in which the spreading elements (4) for radial adaptation to the

Recess (A) of the component to be fastened (T) are bent radially inwardly to each other, in a

Fastening position inside, in the cutting edge projections (12) guided radially outwardly into the wall (W) incision intervene, and for radial abutment of the expansion elements (4) in the mounting position in an opening formed as a passage opening (5) of the hollow cylinder-like expansion anchor (1) insertable is.

13. fastening anchor (10) according to one of claims 1 to 11, characterized in that the

Spreading elements (4) in the insertion direction (e) before the

Cutting projection (12) each have a predetermined bending point (16) on which the spreading elements (4) for

Engagement of the cutting edge projections (12) in the wall (W) are radially bendable.

14. fastening system with a recess (A) to one

fixing component (T) and in the recess (A) form-fitting fixable fastening anchor (10) according to one of claims 1 to 11, wherein the

Fixing anchor (10) one in the basic form

hollow cylinder-like expansion dowel (1) with a in

Provided insertion direction (e) in the recess (A) rear end portion (2.1), which in individual radially to the insertion direction (e) spreadable

Spreizelemente (4) is longitudinally segmented, and the

Spreading elements (4) each one to

Insertion (e) radially outwardly extending cutting edge projection (12) with a radially outer

arranged cutting edge (13) for positive locking

Cutting the cutting edge projection (12) radially outwards into a wall (W) of the component (T) bounding the recess (A) into one

Have fastening position inside.

15. Fastening system according to claim 12, d a du r c h

In the fastening position, apart from the cutting projections (12), the spreading elements (4) are arranged at a distance from the inner wall of the recess (A).

16. Fastening system according to claim 13 or 14, since you rchgekennzeichnet that the recess (A) is provided on the sole side with a Sohlenkegel and the spreading elements (4) end common to the one Sole cone adapted preformed conical

Return to the end-side sliding of the spreading elements (4) on the sole cone under radial spread

have the same.