WO2009059671A1

WO2009059671A1 - Fastening element and fastening method

Info

Publication number: WO2009059671A1
Application number: PCT/EP2008/008478
Authority: WO
Inventors: Hartmut Bohnet; David Lehmann; Raphael Dixa
Original assignee: Fischerwerke Gmbh & Co. Kg
Priority date: 2007-11-08
Filing date: 2008-10-08
Publication date: 2009-05-14
Also published as: DE102007053136A1

Abstract

The invention relates to a fastening element (1) for insertion into a bored hole (2), particularly for fastening to plate-like components (18) and a method for fastening the fastening element (1). The fastening element (1) comprises a rivet pin (3) having a target break point (4), a rivet sleeve (5), an expansion element (7), and a clamping section (13) for connecting a connector piece (16) to the plate-like component (18) by means of clamping. In order to guarantee an orderly function of the fastening element (1) for the widest variety of combinations of thickness of the connector piece (16) and anchoring depth, the invention proposes that the clamping section (13) be compressible in the longitudinal direction such that, upon pulling the rivet pin (3), the expansion element (7) first expands, the clamping section (13) is compressed, and then the rivet pin (3) fails at the target break point (4) thereof.

Description

FIW2303 26.10.2007

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description

Fastening element and method for fastening

The invention relates to a fastening element, in particular for attachment to plate-like components, with the features of the preamble of claim 1. It also relates to a method for attaching a fastener to particular plate-like components, with the features of the preamble of claim 7.

There are fasteners for insertion into a well known, the one

Having rivet mandrel with predetermined breaking point and a rivet sleeve with a running in the axial direction passage opening for receiving the rivet mandrel. In particular, fastening elements are known for attachment to plate-like components, the rivet sleeve at its front in the insertion direction of a spreading element and at its rear in the insertion direction a Klemmabschitt for clamping attachment of a

Object, the so-called attachment, to the plate-like component. The term "plate-like component" encompasses all components whose length and width are substantially greater than their thickness, in particular cladding panels such as those used indoors and outdoors, for example in facade construction

Fiber cement, high-pressure laminates, so-called HPL plates, wood materials, natural stone or glass, this list does not exclude other materials. The term attachment includes all objects that are to be attached to the component or to which the component. Attachments may be, for example, clasps, plate support profiles or simple angle profiles, and this list is not meant to be exhaustive. The attachments usually have a through hole for the fastener.

The document DE 42 03 774 A1 shows a fastener with a spreadable in an undercut of a borehole, slotted expansion sleeve

Expansion segments. The expansion sleeve is spread by a blind rivet, the Setting head is fed and riveted with a rivet mandrel in the slotted part of an inner bore of the expansion sleeve. The blind rivet rests with its collar on the side facing away from the plate-like component of the attachment. By pulling the rivet mandrel into the rivet sleeve, a conical expansion body which expands the expansion segments of the expansion sleeve and presses into the undercut bore occurs.

By pressing the Spreizsegmente into the undercut hole is pulled on the rivet and pressed the collar of the rivet against the object to be fixed to the facade panel.

The document EP 0 841 491 A1 discloses an insertable into a blind hole

Fastener known which comprises a sleeve with a collar, a shaft portion and a rivet mandrel for expanding the sleeve. On the shaft part elevations and depressions are designed as a thread. The attachment has a through hole through which the fastener is inserted into a blind hole of a plate until the collar rests on the attachment. By pulling the rivet mandrel, the sleeve is widened, whereby the thread on the shaft portion of the sleeve is pressed with material deformation in the wall of the blind hole.

A disadvantage of both solutions is that the fastener must be matched exactly to the desired anchoring depth in the component and the thickness of the attachment. If the fastening element is too long, the fastening element will be anchored in the borehole. However, it is not guaranteed that the attachment is pressed by the fastener against the component. An undesirable movement between the component and the attachment is thus possible. If the fastener is too short, the desired anchoring depth is not achieved, creating the necessary

Load transfer is not guaranteed. This can be a security issue. From practice, a system is known that provides for HPL plates combinations of two different anchoring depths and three different cultivation thicknesses. Thus, six types of fastener different in length are needed. The user is therefore forced to hold a corresponding supply of different fasteners. In addition, it must ensure that only the intended fastener is used for a suitable combination of anchoring depth and attachment thickness. The object of the invention is therefore to propose a fastener of the type described and a method for setting the fastener, which ensure proper operation of the fastener at different mounting thickness and anchoring depths.

This object is achieved by the features of claim 1 and claim 7. The fastening element according to the invention has a rivet mandrel with predetermined breaking point and a rivet sleeve with a passage opening extending in the axial direction for receiving the rivet dome. At its front in the insertion direction part is a spreading element and at its rear in the insertion direction a clamping portion is arranged. In principle, it is conceivable that the rivet sleeve itself is designed as a spreading and / or clamping element, or that the rivet sleeve is covered by a further sleeve which serves as a spreading and / or clamping element. The clamping portion is compressible so that when pulling the rivet mandrel first expands the spreader, then the clamping element is compressed and then the

Riveting mandrel breaks at the predetermined breaking point. Drawing here describes the usual in rivets operation of setting the rivet, being drawn with a Nietsetzgerät the rivet mandrel counter to the insertion in the rivet and this is widened and spread, wherein the rivet setting device is supported on the rivet. The compression of the clamping element shortens the clamping area. This can be an enlargement of the

Outer diameter of the clamping area on the side facing away from the component of the attachment result. The expansion leads to a collar-like bulge of the shaft, which is larger than the through hole in the attachment. By pressing the collar-like curvature of the attachment this is pressed against the component and secured by clamping. An alternative embodiment has a preformed collar on the rear part of the clamping portion in the insertion direction. The advantage here is that the length of the clamping area can be ideally matched to the desired wellbore and attachment combinations, since no additional material must be present in the clamping area to form the collar-like curvature. The length of the clamping area then results from the difference of the sum of the largest

Borehole depth and the largest attachment thickness and the sum of the smallest hole depth and the smallest attachment thickness. As a rule, this should be 2 mm to 8 mm.

A further embodiment of the invention has a clamping section with a weakening zone. The weakening zone can be formed, for example, by at least one continuous or discontinuous groove, recess or impression be, which leads to the fact that at least one defined bending point for forming the collar-like bulge is present.

In a further preferred embodiment, the expansion element is slotted. In particular, by a multiple slotting is a targeted control of

Aufspreizverhaltens and the investment of the resulting slit Spreizsegmente to the borehole wall possible.

A further embodiment provides that the expansion element has at least one elevation. The survey may for example serve to increase the frictional forces between the expansion element and the borehole wall, or the survey is so pressed by widening of the sleeve in the material of the component that it comes to a positive connection. The survey may be formed for example as a circumferential cutting edge. For example, several individual bodies are also conceivable. Alternatively, the bore in the component may have an undercut into which the

Survey positively engages. It is also conceivable that the survey is designed as a thread, or consists of sections which are a thread or parts of a thread. As a result, a simple disassembly of the fastener is ensured.

The inventive method for fastening to components having a borehole, in particular to plate-like components, provides that the fastening element according to the invention is inserted into the borehole. This can be done in plug-in or push-through installation. Then the rivet mandrel is pulled, whereby the rivet mandrel expands the expansion element and anchored the fastener in the borehole. Then, by further pulling on the rivet mandrel, the clamping portion is compressed and, by the swaging of the clamping portion, an attachment is clamped to the plate-like member. Only then does the rivet thorn rip. The fact that the rivet mandrel is not completely pulled through the rivet sleeve when pulling up before the clamping portion is finally compressed and the attachment is clamped to the plate-like component, for example by the formation of a stop shoulder, a corresponding configuration of the through hole or by the slit of the sleeve respectively. As a result, the resistance, which is opposed to the mandrel when pulling, can be controlled. A preferred variant of the method provides that shortened by the compression of the clamping portion of the clamping portion and the diameter of the clamping portion is increased.

The borehole in which the fastener is used, for example, a

Be blind hole or undercut hole. The method is basically transferable to any hole geometry and anchorage opening.

The invention will be explained in more detail with reference to two embodiments.

Show it:

Figure 1 shows a first inventive fastener in a

Sectional view, before fixing in a borehole;

Figure 2 shows a second inventive fastener in a

Sectional view before fixing in a borehole; and

Figure 3 shows the second fastener according to the invention in a sectional view after fixing in a borehole.

1 shows an inventive fastening element 1 for fastening an attachment 16 to a component 18. The attachment 16 has for insertion of the fastener 1 has a through hole 15 and the component 18 has a borehole 2. The fastening element 1 comprises a rivet mandrel 3 with predetermined breaking point 4 and a

Rivet sleeve 5. A running in the axial direction of the rivet sleeve 5 through hole 6 receives the rivet mandrel 3. The rivet sleeve 5 has at its front in the insertion direction and in the figure 1 lower part of an expansion element 7, which is here as integrally connected to the rivet 4, unslotted spreader 8 is formed. At the spreading section 8 circumferential elevations 9 are arranged as cutting, the at

Spreading the expansion section 8 increase the friction between the wall of the borehole 2 and the fastening element 1 or positively press into the wall of the borehole 2 and ensure a firm grip. The passage opening 6 is designed in the region of the expansion section 8 so that a stop shoulder 10 is formed as an abutment for the head 1 1 of the rivet mandrel 3. The upper part of the rivet sleeve

5 terminates with a clamping portion 13 which at its upper end a collar 12th having. Between collar 12 and expansion element 7, the rivet sleeve 5 forms the compressible part of the clamping portion 13 with weakening zones 14, which are arranged circumferentially in this case.

To attach the fastener 1 of the rivet mandrel 3 is inserted into a non-illustrated mouthpiece of a rivet setting until the mouthpiece rests on the collar 12 of the rivet 5. The fastener is inserted through a through hole 15 of an attachment 16 in Vorsteckmontage in the borehole 2 until the arranged in the insertion direction at the front end of the head 1 1 cone 17 rises at the bottom of the hole. The opening angle of the cone 17 corresponds to the cutting angle of the drilling tool used to create the borehole 2, which causes the fastener 1 to be centered in the borehole 2 and the longitudinal axis of the fastener 1 to coincide with the axis of the borehole 2. With the Nietsetzgerät the head 11 of the mandrel 3 is pulled into the expansion section 8 of the rivet 5. The elevations 9 engage in the wall of the

Bore 2 and the expansion section 8 is anchored in the borehole 2. At the latest when the head 11 of the mandrel 3 rests against the stop shoulder 10, the movement of the mandrel 3 is stopped. As the rivet setting device retracts the rivet mandrel 3 further into the mouthpiece (not shown), the pressure of the adjoining mouthpiece increases on the collar 12 and the compressible part of the clamping section 13 adjoining it. The clamping section 13 compresses. The weakening zones 14 lay Fixed break points between which the clamping portion expands and plastically deformed. The compression process lasts until the collar 12 and the compressed clamping portion 13 completely rests on the upper side of the attachment 16 and it positively clamped to the

Component 18 attached. Further movement of the mandrel 3 in the mouth of the setting device is not possible. This results in a large tensile force in the rivet dome 3, which leads to the tearing off of the mandrel 3 at the predetermined breaking point 4. Thus, the attachment of the attachment 16 on the component 18 is completed.

FIG. 2 shows a second embodiment of the fastening element V according to the invention prior to fastening in a borehole 2 '. It differs essentially by an additional expansion sleeve 19 'as a spreading T and the absence of a federal government. The borehole 2 'is an undercut bore. The fastening element V, consisting of rivet sleeve 5 ', mandrel

3 'and the slotted expansion sleeve 19' with expansion segments 20 ', is in the borehole 2' in Pre-installed. An unillustrated rivet setting device for fastening the fastening element 1 'is located directly at the upper end of the clamping portion 13'. By pulling the rivet mandrel 3 'with the Nietsetzgerät the rivet sleeve 5' and thus the expansion segments 20 'of the expansion sleeve 19' is braced. The situation after pulling the rivet dome 3 'shows Figure 3. By spreading the expansion sleeve 19' are the

Spreading segments 20 'in the undercut portion of the borehole 2' pressed. The fastening element 1 'is fixed in the borehole 2'. Since the upper part of the expansion sleeve 19 'is not slotted, the rivet mandrel 3' can not be pulled through by the expansion sleeve 19 'with the rivet setting device. It comes to compression of the clamping portion 13 ', which forms a collar-like curvature 21' until the rivet mandrel 3 'at the predetermined breaking point

4 'rips. The collar-like curvature 21 'clamps the attachment 16' against the component 18 '. The lower part of the rivet mandrel 3 'remains in the borehole after failure of the predetermined breaking point 4'. Ideally, the remaining part of the rivet mandrel 3 'is braced in the rivet sleeve 5' in such a way that together they prevent springing back of the expansion segments 20 ', even under tensile load.

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LIST OF REFERENCES

Fastening element and method for fastening

1, 1 ^' fastener

2, 2 'borehole

3, 3 'rivet mandrel

4, 4 'predetermined breaking point

5, 5 'rivet sleeve

6, 6 'passage opening

7, 7 'expansion element

8 spreading section

9, 9 'survey

10 stop shoulder

11, 11 'head of the rivet mandrel 3, 3'

12 fret

13, 13 'clamping section

14, 14 'weakening zone

15, 15 'through hole

16, 16 'attachment

17 cones

18, 18 'component

19 'expansion sleeve

20 'expansion segments

21 'collar-like vaulting

Claims

FIW2303 26.10.2007LDPatentansprüche

1. fastening element (1, 1 ') for insertion into a borehole (2, 2'), in particular for attachment to plate-like components (18, 18 '), wherein the fastening element (1, 1') has a rivet mandrel (3, 3 ') ) with predetermined breaking point (4, 4 '), a rivet sleeve (5, 5'), with a through hole extending in the axial direction (6, 6 ') for receiving the rivet dome (3, 3'), and at its front part in the insertion direction Spreading element (7, 7 ') and one, located at its rear in the insertion direction Klemmabschitt (13, 13') for clamping attachment of an attachment (16, 16 ') to the plate-like member (18, 18'), characterized in that the clamping section (13, 13 ') is compressible in the longitudinal direction in such a way that, when the rivet mandrel (3, 3') is pulled, firstly the

Spreading (7, 7 ') spreads, then the clamping portion (13, 13') is compressed and then the rivet mandrel (3, 3 ') at the predetermined breaking point (4, 4') ruptures.

2. Fastening element according to claim 1, characterized in that the fastening element (1) on the rear in the insertion direction of the

Clamping portion (13) has a collar (12).

3. Fastening element according to claim 1 or 2, characterized in that the clamping portion (13, 13 ') has a weakening zone (14, 14').

4. Fastening element according to one of claims 1 to 3, characterized in that the expansion element (7 ') is slotted.

5. Fastening element according to one of claims 1 to 4, characterized in that the expansion element (7, 7 ') at least one elevation (9,

9 ').

6. Fastening element according to claim 5, characterized in that the elevation is formed as a thread or consists of sections of a thread.

7. A method for attaching to components (18, 18 ') having a borehole (2, 2'), in particular to plate-like components (18, 18 '), with a fastening element (1, 1') according to one of claims 1 to 6, characterized in that the fastening element (1, 1 ') in the borehole (2, 2') is used, that the rivet mandrel (3, 3 ') is pulled thereafter that the

Spreading element (7, 7 ') by pulling the rivet mandrel in the borehole (2, 2') is anchored, that after the clamping portion (13, 13 ') is compressed and that by upsetting the clamping portion (13, 13') the attachment ( 16, 16 ') is clamped to the plate-like member (18, 18') is attached.

8. The method according to claim 7, characterized in that by the compression of the clamping portion (13, 13 ') of the clamping portion (13, 13') shortened and the diameter of the clamping portion (13, 13 ') is increased.

9. The method according to claim 7 or 8, characterized in that the

Drill hole (2) is a blind hole.

10. The method according to claim 7 or 8, characterized in that the

Drill hole (2 ') has an undercut.