WO2016146567A1

WO2016146567A1 - Fastening element and fastening system for fastening composite plates, in particular for façade elements

Info

Publication number: WO2016146567A1
Application number: PCT/EP2016/055426
Authority: WO
Inventors: Manfred Woschko; Donat Woschko
Original assignee: Manfred Woschko; Donat Woschko
Priority date: 2015-03-13
Filing date: 2016-03-14
Publication date: 2016-09-22
Also published as: EP3268556B1; EP3268556A1; DE102015009726A1

Abstract

The invention relates to a fastening element for a plate (2), wherein a pin (4) is fastened to a base plate (5) and a plurality of retaining elements (6, 6') can be fastened there. The retaining elements (6, 6') have a contact region (7, 7') and a segment (8, 8') that is angled in relation to the contact region (7, 7'). In the event of planar contact of the contact region (7, 7') of the retaining elements (6, 6') with the side of the base plate (5) facing the pin (4), the angled segment (8, 8') points away from the pin (4) beyond an outer edge of the base plate (5).

Description

Fastening element and fastening system for fastening composite panels, in particular for facade elements

The invention relates to a fastener and a fastening system for plates, in particular composite panels, which are preferably to be fixed to the outside of buildings.

Although the invention may be used with respect to any type of panel, its use is particularly advantageous in the context of composite panels. The invention is therefore explained in relation to composite panels, but without the

To limit generality also for other plates.

Metal composite panels as typical examples of composite panels usually consist of a plastic core, which is planked on both sides with thin metal plates. Instead of the metal plates, another composite material harder than the core can be used in other composite plate systems. In particular, it is also conceivable plates with a

manufacture multilayer structure made of plastic. A problem with the attachment of such plates is that the connection between the plastic core and the surface-forming materials is often difficult. For attachment of such plates, it is therefore common to provide the plate with a through hole and then to screw. Such

However, fittings are not especially on the outside of buildings

unproblematic. In addition to the optical impairment is here in particular the lack of tightness of the outside to call, as at the screw head and through the through hole water can penetrate behind the composite plate.

A first proposal to solve these problems has been made in DE 10 2014 004 820 AI. Here, a fastener is provided, which consists of a base plate and a threaded pin. Furthermore, a holding element is provided, which in contrast to Base plate, which is circular in plan view, is elongated. The total length of the retaining element is greater than the diameter of the base plate. In the composite plate an undercut recess is introduced. The section which is open to the surface corresponds in its diameter substantially to the diameter of the base plate. In addition, the cutout has two opposite radial extensions, so that in this area the holding element can be used. By turning the retaining element it then engages behind at least the plate into which the cutout is made.

A disadvantage of the described embodiment is that only in the region of the ends of the holding element, which protrude beyond the base plate, a power transmission of the

Fixing element on the composite plate is possible. Especially with composite materials where the connection between the cover plate and the plastic core is relatively poor, but this is problematic. The force is applied over a too small surface area. A deformation of the cover plate and possibly a tearing of the

Plastic core is therefore possible.

It is therefore the object of the invention to provide an improved fastening solution.

The object is achieved by the fastening element according to claim 1 and the corresponding fastening system.

The fastening element according to the invention for a plate has a pin for attachment to a plate holder. Such a pin may for example be a threaded pin which is fixed to a base plate of the fastener. An attachment of the pin to the

Base plate can be done for example by welding. On the base plate a plurality of retaining elements can be fixed. By the plurality of retaining elements is a distribution of the force with which the composite plate is fixed to a plate holder, such as a facade of a building, possible. In particular, the plurality of retaining elements over the circumference of

Base plate distributed. The selective introduction of force in the composite plate can thus be prevented. In addition, the holding elements have a flat bearing area and a section angled relative to this area. The angled section is oriented in such a way that, in the case of a flat covering of the support area, it can be used Has retaining elements on the base plate of the pin for attachment points away. The angled area protrudes beyond the outer edge of the baseplate.

By this arrangement, it is possible that the chamfered portion is inserted through a narrow gap between the recess in the plate and the base plate of the fastener. The subsequent fixing of the retaining element to the base plate causes the bevelled areas projecting obliquely into the composite plate and there can lie flat against a corresponding cutout of the plate. If holding elements are now used which essentially correspond to a circle segment, then a transmission of force can take place over almost the entire circumference of, for example, a circular base plate. The surface is therefore considerably larger than the known fastening system.

In the dependent claims are advantageous developments of the invention

Fastener executed.

In particular, it is advantageous that the plurality of holding elements, which allow, for example, a transmission of force over almost the entire circumference of the base plate, are connected to one another via a plastically formable connection. About such a plastic moldable connection, it is possible to connect only one of the holding elements fixed to the base plate. This considerably simplifies the assembly work.

It is particularly advantageous if the region of the transition forms the plastically deformable connection in the region of the transition between the support region and the angled portion of the holding elements by a web. The formation of such a web in this area allows twisting of the web in the course of a pre-assembly. Thus, from the fixed to be connected to the base plate holding element facing away in the circumferential direction ends of the adjacent holding elements in the direction of the pin. This allows the entire, pre-assembled fastener can be easily inserted into a cutout of a plate. The cutout is this to make preferably slightly larger than the

Base plate of the fastener. By means of this slightly larger, undercut cutout, the holding element already fastened to the base plate can be inserted into the undercut. Subsequently, the adjacent holding elements can also in the undercut are pressed, wherein the angled portion similar to previously described by a gap between the base plate and the plate are used. By bending the retaining elements are not only pressed radially outward by the action of a tensile force on the pin, but also the support area held flat on the base plate. The connection between the fixedly secured to the base plate holding member and the adjacent

Holding elements thus serves only for mounting. Subsequently, the holding elements are fixed by the forces occurring in terms of their position anyway.

The base plate is formed substantially circular and the angled portions of the holding elements together form a hollow cone section. This is behind the

Entity of the holding elements in the assembled state, the undercut of the composite plate. If the composite plate is so thick and the cutout is so deep that after insertion of the fastener in the cutout of the composite plate, a height offset between the outer surface of the plate and the fastener or the holding elements exists, so can in the region of the opening of the cover plate of the composite plate a disc can be used. With the help of this disc, the positional fixation of the holding elements is then further improved.

In order to facilitate the insertion or to prevent the cut in the plate must be made unnecessarily large in order to use the fastener, may be provided on the outer peripheral edge of the base plate to provide a tapered portion. Such a chamfer makes it easier to insert the angled section of the holding elements past the edge of the base plate into the cutout. This is particularly advantageous in combination with the interconnected holding elements. The fact that only a certain area of the base plate is bevelled ensures that the

Angled area nevertheless when planting the support area on the base plate

Retaining elements radially outwardly presses. Namely, each of the holding members abuts along the outer periphery of the base plate in a non-tapered region.

The invention will be explained in detail below with reference to the accompanying drawings. Show it: Figure 1 is an overview of the system consisting of the fastener and a composite plate to explain the operation of the fastening solution;

Figure 2 shows an example of several interconnected holding elements;

Figure 3 is a plan view of a base plate with a pin for fixing a composite plate to, for example, a facade of a building;

Figure 4 is a plan view of a preassembled module consisting of the base plate and the interconnected holding elements, which form the fastening element;

Figure 5 is a perspective view for explaining the initial situation before

Inserting the preassembled fastener in the cutout of the composite panel; FIG. 6 shows a further, simplified embodiment of a fastening element;

Figure 7 shows the fastener of Figure 6 in a sectional view; and

FIG. 8 shows a modified exemplary embodiment of the fastening element according to FIG. 6

FIG. 1 shows the overall system 1 for fastening a composite panel. The composite plate 2 has in a known manner, for example, two directed towards the outer sides of metal plates which are interconnected by a plastic core. In these

Composite plate 2 is a cutout 10 is introduced. The cutout is executed, for example, in a plan view of the left in Figure 1 cover plate circular. The cutout 10 has an undercut and does not extend over the entire thickness of the composite plate 2. The cutout has the geometry of a truncated cone in the plate cross-section. For fixing the composite plate 2 to a plate holder, e.g. Metal profiles on an outer wall of a building, a fastener 3 is provided. The fastening element 3 has a threaded pin 4. Instead of the threaded pin 4, of course, other preferably pin-shaped elements are provided with which the frictional connection to the plate holder is possible. The illustrated threaded pin 4 is fixed to a base plate 5 of the fastener 3. The attachment is preferably by welding, so as to allow a mass production inexpensively.

The diameter of the preferably substantially circular base plate 5 is chosen so that it is smaller than the opening diameter of the cutout 10 to the surface of the

Composite plate 2 out. On the base plate 5 are also distributed over the circumference of the base plate arranged, a plurality of holding elements 6, 6 ^'is provided. These holding elements 6, 6 ^' have a support region 7, 7', and a chamfered section 8, 8 '. The chamfered portion 8, 8 'is angled relative to the support area 7, 7' preferably at 45 ° angle. The outwardly directed surface of the angled portion 8,8 ^' is thus on the wall of the

Cutout 10 on.

FIG. 1 shows a solution in which a plurality of holding elements 6, 6 'are connected to one another. Thus, to fix all holding elements 6, 6 ^'of the fastening element 3, only one of the holding elements 6 to be firmly connected to the base plate 5. In the illustrated embodiment, this is realized by a screw. Alternatively, the one, firmly connected holding element 6 can be welded to the base plate 5, for example by spot welding. The holding element 6 which is screwed to the base plate 5 shows that the angle between the Aufiageb ereich 7 and the angled portion 8 is just in a position so that the chamfered portion 8 protrudes from the base plate 5.

By contrast, in the case of the holding element 6 'not fixedly connected to the base plate 5, it can be seen that the bearing area 7' protrudes laterally beyond the base plate 5. This will be explained below with reference to FIG. The reason is that for the easier

Insertability of the fastener 3, the base plate 5 does not have a constant diameter over the entire circumference.

It can also be seen in FIG. 1 that the total height of the fastening element 3, that is to say the thickness of the base plate 5 plus the thickness of the bearing regions 7, 7 ^' , is selected such that its height corresponds to the milling depth of the cutout 10. Thus, the oriented in the direction of the free end of the pin 4 surface of the Aufiagebereiche 7, 7 ^'is flush with the surface of the composite panel 2. However, it may also occur, especially in thicker composite panels 2 that the cutout 10 is deeper. In order not to have to provide separate fasteners 3, it is then advantageous to use a shim that compensates for the height offset between the surface of the composite plate 2 and the support members 6, 6 '. In both cases, so in the case of both the flush insertion of the fastener 3 and in the case of using a shim, when screwing the

Threaded pin 4 on a support or a facade a surface pressure between the

Fastener 3, or its holding elements 6, 6 ^' and the counterpart, which is firm on the building, achieved. As a result, the bearing area 7, 7 'of each retaining element 6, 6' sandwiched between the base plate 5 and the counterpart, so that it to a flat

Support of the support area 7, 7 ^' on the base plate 5 comes. Thus, a tilting of the holding elements 6, 6 ^' is reliably prevented, so that the angled section 8, 8 ^' engages securely in the undercut of the cutout 10.

2 shows a plan view from the side of the threaded pin 4 on a total of three retaining elements 6, 6 ^' , 6 ^" .It can be seen that the retaining element 6 is provided with a bore via which the retaining element 6 is screwed together A second holding element 6 'is connected to the holding element 6, which is firmly fastened to the base plate 5. The connection is made by a web 9 which is in the region of the transition between the support region 7 and the angled section 8 of the holding element 6 and the

Supporting portion 7 'and the angled portion 8' of the second holding member 6 'is formed. The web 9 is plastically deformable. Thus, as will be explained below with reference to Figure 5 for pre-assembly of the fastener 3 and easier insertion into a cutout 10, the holding element 6 'relative to the holding member 6 are rotated. After insertion of the fastener 3 then the web 9 can be plastically deformed and the support portion 7 'of the second support member 6' with the

Supporting region 7 of the retaining element 6 are brought into a plane.

In the same way, via a second web 9 ', the third holding element 6 "with the

Holding element 6 connected. Again, during the pre-assembly, the third holding element 6 "is rotated so that it is erected in the direction of the free end of the threaded pin 4. After inserting the preassembled fastener 3 then the two erect, remote from the holding element 6 ends of the holding element 6 ^' and the holding element 6 ^" lowered into the cutout 10, so that the webs 9, 9 'are plastically deformed. After inserting the holding elements 6 ^' and 6 ^" into the cutout, the plate 2 can be assembled, as already explained above, ensuring that the bearing areas 7 ^' and 7 ^" firmly rest against the base plate 5 and thus the position of the angled portions 8 'and 8 "is set as well as the position of the angled portion 8.

3 shows a plan view of a base plate 5 of the fastener 3. In the middle of the substantially circular base plate 5, the threaded pin 4 by welding attached. A receptacle for the screw is also provided in the base plate 5 and designated 11. The thread 11 for receiving the screw is provided in a region of the base plate 5 with a first diameter. On the opposite side, but over less than half of the circumference, the base plate 5 has a smaller radius. In this way, the insertion of the preassembled fastener 3 is facilitated in the cutout 10. As a further aid, starting from approximately the region of the web 9 or of the second web 9 ', a chamfer 12 or 12' is formed in the base plate 5.

This chamfer 12, 12 'runs so that the erected during pre-assembly

Holding elements 6 'and 6' 'with their angled portions 8', 8 "along this

Bevel can be pushed into the cutout 10.

In the area of the reduced diameter of the base plate 5, however, there is a distance between the transition between the support region 7 'or 7 "and the angled section 8' or 8". To prevent this distance from moving

Holding member 6 'and 6 "relative to the base plate 5 is possible, the chamfer 12 or 12' does not extend to the region of the reduced diameter of the base plate 5. This remains between the end of the chamfer 12 and 12 'and the beginning of the Diameter reduced area of the base plate 5, a section which presses in the assembled state by abutment at the transition between support region 7 'and 7 "and the angled section 8' and 8 ^" the holding elements 6 ^' and 6 ^" radially outward.

FIG. 4 shows a plan view in which the preassembled fastening element 3 is shown. A repeated explanation of the individual elements is omitted. The illustration is to illustrate the course of the chamfer 12 or 12 '. This starts at the

Circumferentially seen ends of the fixed mounting member 6th

FIG. 5 shows the preassembled fastening element 3 in a perspective view. It can be seen that the ends of the second holding element 6 'and the third holding element 6 ^" seen in the circumferential direction are set up in the direction of the free end of the threaded pin 4. In this way, the preassembled fastening element 3 can be inserted into the cutout 10. After the fastener 3 is inserted, then in 5 bent upward ends of the holding elements 6 ^' and 6 ^" downward and thus the respective angled region 8 ^' and 8 ^" pressed into the resulting gap between the base plate 5 and the cutout 10. The farther the holding members 6 ^' and 6 ^" are pushed down, the more the angled portions 8 ^' and 8 ^", respectively, push outwardly as they abut the end of the chamfer 12,12 ^' and the outer circumference, respectively A further fixation of the holding elements 6 ^' and 6 ^" is not required, because as already stated by the surface pressure anyway a position stabilization occurs. The holding elements 6 ^' and 6 ^" are therefore connected only via the webs 9 to the holding element 6 fixedly attached to the base plate 5. The webs 9, 9 ^' must be plastically deformable Tool can be done, which is guided by the threaded pin 4. It can be provided, for example, a kind of stamp, which rests against the upright ends of the holding elements 6 and 6 ^' and then guided in the direction of the base plate 5.

A simplified embodiment of a fastening element with three individual retaining elements 6 ^' or 6 ^" is shown in plan view in Figure 6. It can be seen that, in contrast to the preferred one described above

Here, the retaining elements 6, 6 ^' and 6 ^"are not connected to each other, they are individually inserted into the cutout after inserting the base plate with the threaded pin 4. Subsequently, they are screwed to the base plate.

FIG. 7 shows a section through such an arrangement. It can be seen that the holding elements 6, 6 ^' and 6 ^" here also have an angled region, but this does not necessarily have to correspond to a cone on the lower side shown in Figure 7. It is sufficient by the individual insertion of the holding elements if they are displaceable in the radial direction of the base plate 5. The positional fixing takes place here by the individual screwing of the holding elements

described, preferred embodiment, this has the disadvantage that the effort during assembly is considerably more complex and in particular a pre-assembly of

Fasteners can not be done.

In the figure 8, finally, a further illustration is shown with a disc which a height offset between the surface of the holding elements 6 and 6 ^" and the surface of the Composite plate compensates. This was preceded by the figure. This shim has the same function as has already been explained with respect to the embodiment of Figures 1 to 5.

Claims

claims

A fastening element for a plate (2), with a pin (4) for attachment to a plate holder, wherein the pin (4) is fixed to a base plate (5) and on the

Base plate (5) a plurality of holding elements (6 6 ', 6 ") are fixable, which is a

Supporting area (7, 7 ', 7 ") and the opposite angled portion (8, 8', 8"), so that when two-dimensional contact of the support area (8, 8 ', 8 ") of the

Holding elements (6. 6 ', 6 ") on the in the direction of the pin (4) side facing the

Base plate (5) of the angled portion (8, 8 ', 8 ") of the pin (4) pointing away beyond an outer edge of the base plate (5) protrudes.

2. Fastening element according to claim 1,

characterized,

in that a plurality of holding elements (6, 6 ', 6 ") are connected to one another via a plastically moldable connection (9, 9').

3. Fastening element according to claim 2,

characterized,

that for connecting the holding elements (6. 6 ', 6 ") with each other in the region of

Transition between the support area (7, 7 ', 7 ") and the angled portion (8, 8', 8") of the holding elements (6. 6 ', 6 ") is a web (9, 9').

4. Fastening element according to one of claims 2 or 3,

characterized,

in that one of the holding elements (6) is firmly connected to the base plate (5) in a preassembled state while the further holding elements (6 ', 6 ") point in the direction of the end of the pin (4) directed away from the base plate (5).

5. Fastening element according to one of claims 2 to 5,

characterized,

in that the base plate (5) is essentially circular and the angled section (8, 8 ', 8 ") of the holding elements (6. 6', 6") corresponds to a hollow cone section.

6. Fastening element according to one of claims 1 to 5,

characterized,

a bevelled area (12, 12 ') is formed on the outer edge of the base plate (5) as an insertion aid for the holding elements (6', 6 ") in a recess (10) of the plate (2).

A system for fixing a plate (2) to a plate holder comprising a plate (2) into which an undercut opening (10) is inserted, and a fixing element (3) according to any one of claims 1 to 5.

8. System according to claim 7

characterized,

that the plate (2) is a composite plate, in particular a metal composite plate.