Facade fastening arrangement

Abstract

Facade fastening arrangement, comprising a facade surface element (10), a pair of claw plates (20) and a tension connector (30), wherein the facade surface element (10) has an inner surface (11) and a longitudinal groove (12) arranged on the inner surface of the surface element, which has a first undercut contour (13) and a second undercut contour (14), wherein the undercut contours (13, 14) are arranged on both sides of a longitudinal groove median plane orthogonal to the inner surface (11) of the surface element, wherein the pair of claw plates (20) comprises a first claw plate (21) and a second claw plate (22), wherein the first claw plate (21) comprises a first foot section (21.1) with a first undercut contour (21.2) and a rear first contact surface (21.3), and the second claw plate (22) comprises a second foot section (22.1) with a second undercut contour (22.2) and a rear second contact surface (22.3), and wherein the undercut contours (13, 14) are configured to correspond to the undercut contours (21.1, 22.2), wherein the tension connector (30) is configured to provide a tensile force between the claw plates (21, 22) that is parallel to the inner surface (11) of the surface element and orthogonal to the longitudinal groove (12), and wherein the pair of claw plates (20) is designed for a connection with trained by a liaison partner wherein the facade fastening arrangement is designed for a decoupling state and for a coupling state, In the decoupling state, there is no defined positional relationship between the facade surface element (10) and the pair of claw plates (20). In the coupling state, there is a positively locked defined positional relationship between the facade element (10) and the pair of claw plates (20), in that the first undercut contour (21.1) engages with the first undercut contour (13) forming a first longitudinally extended pressure contact surface, and the second undercut contour (22.2) engages with the second undercut contour (14) forming a second longitudinally extended pressure contact surface, and the first and second contact surfaces (21.3, 22.3) abut each other by means of the tension connector (30) forming a rearward pressure contact surface, and the decoupling state can be converted into the coupling state and vice versa by means of a pivoting of at least one of the claw plates (21, 22).

Description

[0001] The invention relates to a facade fastening arrangement for the secure fastening of flat facade cladding elements to buildings.

[0002] Prefabricated facades, formed by flat facade cladding elements, are a well-established technology. Due to their advantages in terms of durability, attractive design, and building physics benefits such as the possibility of weatherproof insulation and ventilation, they are widely used in high-quality facades.

[0003] In this process, according to current technology, substructures are usually attached to the building wall and the surface-forming facade elements are arranged on this substructure.

[0004] Especially with large-area facade elements, it is necessary to attach them to the substructure at a number of points or in a linear fashion across their surface in order to distribute both static and dynamic loads, particularly those caused by wind suction or pressure, sufficiently to prevent deformation or structural failure of the large-area facade elements.

[0005] It is known from the prior art, for example, to fasten such facade elements using screw or rivet connections. A disadvantage is that the fasteners, in the form of screw or rivet heads, are visible on the outside and visually impair the overall appearance of the facade.

[0006] Solutions for non-visible rear fastenings in metal facade elements include, for example, anchor bolts welded to the back, although the thermal stress during welding can unintentionally impair the appearance of the opposite visible side, especially if it has a coating.

[0007] While adhesive-bonded fasteners on the back overcome this disadvantage, they are subject to strict monitoring regulations due to the significant risks of failure caused by falling facade elements and are therefore very expensive.

[0008] An advantageous solution is shown, for example, in DE 10 2022 001 666 A1. Two interlocking bodies spaced apart by a substructure are arranged as a pair of interlocking bodies and each engages in a rear groove of a pair of grooves in a surface element. This provides an invisible and simultaneously positive-locking connection. This solution makes a recognized contribution to the state of the art, but at the same time requires precise coordination of the groove arrangement, the interlocking bodies, and the substructure.

[0009] The object of the invention is to provide a solution for the concealed fastening of surface-forming, in particular large-area, facade elements to buildings, overcoming the disadvantages of the prior art, which offers high safety, even in the case of possible thermal changes in length, which is adaptable to different geometries and sizes of both the facade elements and to different designs of the substructure, enables simple and error-free installation and is cost-effective.

[0010] The problem is solved by the features listed in claim 1. Preferred embodiments are set forth in the dependent claims.

[0011] The facade fastening arrangement according to the invention is characterized in particular by the interaction of a pair of claw plates with a rear longitudinal groove of a facade surface element.

[0012] According to the invention, the facade fastening arrangement comprises as basic components a facade surface element, a pair of claw plates and a tension connector.

[0013] For the purposes of the present invention, a facade surface element is understood to be any facade element that forms the outer surface of a facade.

[0014] In addition to its outer side, hereinafter also referred to as the outer surface of the surface element, the facade surface element has an inner surface, which forms the invisible back of the outer surface of the surface element.

[0015] The facade panel has a longitudinal groove on its inner surface. Undercut contours, referred to here as the first and second undercut contours, are arranged on both sides of a longitudinal groove center plane that is perpendicular to the surface plane.

[0016] Insofar as numerals such as first, second or similar are used in the description and in the claims, this does not serve to indicate a specific hierarchy or value, but merely for unambiguous identification and assignment.

[0017] The longitudinal groove can therefore preferably be designed as a dovetail groove or a T-slot. An undercut contour is understood to be a shaped contour in the longitudinal groove that forms an undercut. This is a recess projecting into the facade element, which can be engaged by a counter contour in a form-fitting manner. The recess can be designed as a slope, but also as another concave shape. Preferably, the first and second undercut contours are identical and arranged as mirror images of each other about the longitudinal groove's center plane.

[0018] The facade fastening arrangement according to the invention also includes, as an essential basic component, the pair of claw plates. This is formed by the first claw plate and the second claw plate, which are preferably identical and can therefore be arranged mirrored relative to each other for one assembly state.

[0019] The claw plates each have a foot section. This is a shaped section that forms an undercut contour. The undercut contour is a one-sided projection – viewed from a plate plane – whose geometry is designed for placement in the longitudinal groove in such a way that it aligns with the corresponding undercut contour, enabling a positive locking position along the Z-axis relative to the plate plane of the surface element. Accordingly, the undercut contours of the longitudinal groove and the undercut contours of the claw plates are each designed to correspond to one another.

[0020] The foot section is understood to be the section of the respective claw plate that, in its installed position, is oriented towards the facade element. The opposite section is subsequently also referred to as the head section.

[0021] In addition, each claw plate has a rear surface, which is subsequently referred to as the first contact surface for the first claw plate and the second contact surface for the second claw plate.

[0022] The tension connector is designed to provide a tensile force between the claw plates that is parallel to the inner surface of the surface element and orthogonal to the plane of the claw plates. In a simple design, this can be a screw or a rivet.

[0023] The pair of claw plates is designed for connection with a connecting partner. The connecting partner itself is not part of the facade fastening arrangement according to the invention. This connection can preferably be provided simultaneously via the tension connector. In this case, the claw plates preferably have a bore that can accommodate the tension connector. Furthermore, it is possible that only one of the two claw plates establishes a direct connection to the connecting partner.

[0024] As a connecting partner within the meaning of the present invention, any component to which the facade surface element is fixed in its positional relationship and for force transmission is understood.

[0025] The connecting partner preferably forms part of the facade's substructure. This can, for example, be designed as a steel or aluminum structure that is attached to and anchored in front of a building wall structure and preferably has vertical or horizontal longitudinal profiles on which the facade panel element is arranged parallel to the wall. The pair of claw plates is preferably arranged on the longitudinal profiles and tensioned to them by the tension connector.

[0026] According to the invention, the facade fastening arrangement is designed for a decoupling state and for a coupling state.

[0027] In the decoupling state, the components are still or again disassembled, and in particular there is no defined positional relationship between the facade surface element and the pair of claw plates.

[0028] In the coupled state, a fixed, positive-locking positional relationship is established between the facade element and the pair of claws. This relationship is defined by the first interlocking contour engaging with the first undercut contour, forming a first longitudinally extended pressure contact surface, and the second interlocking contour engaging with the second undercut contour, forming a second longitudinally extended pressure contact surface. Furthermore, the first and second contact surfaces are in contact with each other, forming a rearward pressure contact surface. In the installed position, the claw plates are thus arranged in opposite directions. Through the opposing interlocking contours, which engage with their corresponding counterparts—the undercut contours in the facade element—they form a specific positive-locking connection.Advantageously, the geometries of the first and second foot sections as well as the undercut contours of the longitudinal groove are adapted so that when the two contact surfaces are in contact with each other, the contours are arranged without play and with a contact pressure towards each other.

[0029] The positioning between the pair of claw plates and the facade surface element is positively locked in all translational and rotational degrees of freedom, with the exception of the translational degree of freedom in the longitudinal axis of the longitudinal groove. Here, a frictional connection exists due to the clamping in the undercut contours.

[0030] This can be advantageously supported by claw-shaped sections of the respective foot section or by ribbing in the respective gripping contour.

[0031] Furthermore, the facade fastening arrangement according to the invention is designed such that it can be moved from the decoupling state to the coupling state and vice versa by pivoting. Preferably, a claw plate is first positioned with its foot section in the longitudinal groove such that the gripping contour and the undercut contour are engaged. Subsequently, the second claw plate is inserted into the longitudinal groove at an angle with its foot section. By subsequently pivoting the second claw plate towards the first claw plate, a process that continues while applying a clamping force until the rear contact surfaces of both claw plates are in contact, the claw plates are positioned without play relative to each other and to the facade element. The contact surfaces support each other in the area of ​​the two foot sections and press the gripping contours against the undercut contours.

[0032] The facade fastening arrangement according to the invention has in particular the following advantages.

[0033] The advantage is that the fastening is not visible from the outside, so there are no restrictions regarding design specifications.

[0034] Furthermore, the positive-locking connection is advantageous both perpendicular to the facade surface plane and transversely to the longitudinal groove axis. This provides a reliable and robust connection.

[0035] Furthermore, the purely friction-based coupling along the longitudinal groove is advantageous, as it allows for stepless positional adjustment of the fastening point arrangement along this axis. In addition, this enables longitudinal displacement in specific applications to accommodate thermal expansion and contraction resulting from significant temperature fluctuations, particularly on sun-exposed facades.

[0036] Furthermore, the ability to adapt to different substructures through the choice of the arrangement of the longitudinal grooves, the free positioning of the claw plates in the longitudinal grooves and the choice of the length and height of the claw plates is advantageous.

[0037] This offers the advantage of simple and precise alignment of the facade panels, along with good adjustability of the joint pattern. Furthermore, multiple longitudinal grooves with multiple pairs of claw plates can be advantageously incorporated. These longitudinal grooves can also be arranged parallel, transverse, or diagonally. For special applications, even with a slightly inclined longitudinal groove, fine adjustment in the transverse direction is possible by shifting the corresponding pair of claw plates within the groove.

[0038] Furthermore, it is advantageous that the facade fastening arrangement according to the invention is particularly applicable to facade elements of thinness. It has been found that, for example, a reliable positive-locking connection can be achieved with a longitudinal groove depth of only 1 to 2 mm. Thus, facade elements with a material thickness of, for example, only 2 to 4 mm can be reliably concealed and fastened. Moreover, there are advantageously no limitations for greater groove depths or greater material thicknesses of the facade elements.

[0039] Another advantage lies in the low cost. The claw plates can be manufactured cost-effectively either as simple bent stamped parts or by cutting extruded profiles to length. This allows for precise shaping, especially of the foot section with its gripping contour. They can be produced cost-effectively as bar stock.

[0040] The width of the claw plates is determined by the practically free selection of the length during cutting. For high load-bearing capacities, claw plates with very large widths can also be manufactured, which can be several times their height. Claw plates with large widths can therefore transmit correspondingly higher forces.

[0041] Advantages include the simple assembly, which can be done without special tools, and the low susceptibility to execution errors, since the reliable tight fit of the claw plate pair is already ensured by their geometry in conjunction with the geometry of the longitudinal groove, without it being dependent on specific torques or other stresses.

[0042] Furthermore, the facade fastening arrangement according to the invention can be dismantled and reassembled without damage.

[0043] According to an advantageous further development, the facade fastening arrangement is characterized in that the connecting partner is designed as a longitudinal profile, the longitudinal axis of which is arranged parallel to the inside of the surface element.

[0044] According to this further training, the pair of claw plates can be easily attached to the longitudinal profile. Furthermore, several pairs of claw plates can be arranged at selectable intervals in the longitudinal groove and attached to the longitudinal profile.

[0045] According to a further advantageous embodiment, the facade fastening arrangement is characterized by the fact that the undercut contours and the interlocking contours are wedge-shaped. The coupling, which can thus be produced as a dovetail joint, enables a particularly reliable tight fit via the wedge flanks, even in the longitudinal direction of the groove. The wedge shape creates an undercut that automatically provides a clamping force perpendicular to the plane of the facade element in the direction of the claw plates.

[0046] According to a further advantageous embodiment, the facade fastening arrangement is characterized in that at least one of the claw plates has a foot-side end surface section, wherein in the coupling state the respective end surface section rests against the inside of the surface element, forming a respective end pressure contact surface.

[0047] Particularly in conjunction with the aforementioned further development, in which the undercut contours and the interlock contours are wedge-shaped, the vertically acting pressure pulls the facade surface element with its inner facade element side against the end surface sections, resulting in a play-free and vertically defined positional relationship between the claw plates and the facade surface element.

[0048] Furthermore, this offers the advantage that the forces acting perpendicular to the plane of the facade element are transferred via the end contact surface on the inside of the element, rather than via the bottom of the longitudinal groove, when subjected to wind pressure. This prevents visually unappealing bulges on the visible side, particularly in the case of very thin facade elements, such as those made of aluminum composite panels.

[0049] In a further advantageous embodiment, the facade fastening arrangement is characterized by having several pairs of claw plates and several tension connectors. Advantageously, according to this embodiment, force transmission and positioning between the substructure and the facade surface element can occur at a plurality of point or line positions.

[0050] The invention is described as an embodiment by reference to Fig. 1 Isometric view in the decoupling state Fig. 2 Isometric view in the coupled state Fig. 3 Enlargement of a first foot section Fig. 4 Enlargement of a second foot section Fig. 5 Sectional view in the coupling state Fig. 6. Illustration of an assembly sequence Fig. 7 Schematic view with several pairs of claw plates explained in more detail.

[0051] In this context, identical reference symbols in different figures refer to the same features or components. These reference symbols are used in the description even if they are not shown in the figure in question.

[0052] Fig. Figure 1 shows an embodiment in a decoupling state and Fig. Figure 2 shows the same embodiment in a coupled state. Therefore, the Fig. 1 and Fig. 2 are described together below.

[0053] In a facade surface element 10 designed as an aluminum composite panel with a material thickness of only about 6 mm, a longitudinal groove 12 of about 4 mm depth is milled into the inside surface element 11, which is not visible on the finished facade.

[0054] The pair of claw plates 20 comprises a first claw plate 21 and a second claw plate 22. The claw plates 21 and 22 are manufactured as extruded aluminum profiles and cut to the desired width. Both claw plates 21 and 22 are identical components, differing only in their opposing arrangement, resulting in a different orientation of the first foot section 21.1 on the first claw plate 21 and the second foot section 22.1 on the second claw plate 22. Due to their extrusion, the foot sections 21.1 and 22.1 each have a very precisely shaped, wedge-shaped first gripping contour 21.2 on the first claw plate 21 and a second gripping contour 22.2 on the second claw plate 22. In the coupled state, the first mounting surface 21.3 and the second mounting surface 22.2 are adjacent to each other and the interlocking contours 21.1, 22.1 are in engagement with the undercut contours 13, 14 - shown in . Fig. 5 - the longitudinal groove 12. In the coupled state, the contact surfaces 21.3, 22.3 support each other, particularly in the zone of the foot sections 21.1, 22.1, and are in pressure contact there. A backside pressure contact surface is present there.

[0055] The Fig. 3 and Fig. Figure 4 shows enlarged sections of the end face sections 21.4 and 22.4, which are also present in this embodiment. The first claw plate 21 has the first end face section 21.4, and the second claw plate 22 has the second end face section 22.4. In the coupled state, the end face sections 21.4 and 22.4 bear against the inner surface 11 of the surface element, thus ensuring precise positioning perpendicular to the plane of the surface element. Furthermore, compressive forces acting on the facade surface element can be dissipated via the end face contact surfaces thus formed, and an undesirable force input onto the base of the longitudinal groove, which could lead to bulging on the visible side, can be avoided.

[0056] In the Fig. Figure 5 shows a sectional view, in particular illustrating the contour of the longitudinal groove 12 and the interaction of the foot sections 21.1 and 22.1. The first undercut contour 13 corresponds to the first undercut contour 21.2, and the second undercut contour 14 corresponds to the second undercut contour. The mirrored wedge-shaped design provides a dovetail-like coupling.

[0057] Fig. Figure 6 shows the coordinated nature of the geometries of the longitudinal groove 12 and the claw plates 21, 22, which makes it possible to switch from the decoupling state to the coupling state and vice versa by simply pivoting at least one claw plate 21 or 22.

[0058] In position a), the facade surface element 10 and the claw plates 21, 22 are not in a defined positional relationship.

[0059] In position b), the first foot section 21.1 is inserted into the longitudinal groove 12 and the second claw plate 22 is located with its second foot section 22.1 still outside the longitudinal groove 12.

[0060] In position c), the second foot section 22.1 is now also inserted into the longitudinal groove 12, with both claw plates 21, 22 tilted away from each other.

[0061] In position d), both claw plates 21, 22 are now pivoted proximally towards each other, so that their rear sides initially support each other as contact surfaces 21.4, 22.4 in the area of ​​the foot sections 21.1, 22.1 and increasingly press the undercut contours 21.2, 22.2 into the undercut contours 13, 14 of the longitudinal groove.

[0062] In position e), the coupling state now exists. The claw plates 21, 22 are each in contact with their rear surfaces 21.4, 22.4, and the positive locking – as well as the static friction locking in the longitudinal groove axis – is established.

[0063] Ultimately, it shows Fig. 7 an embodiment of a facade fastening arrangement in which, in addition to the pair of claw plates 20 and the associated tension connector 30, further pairs of claw plates 20n with each associated tension connector 30n enable the fastening of even particularly large-format facade surface elements 10 to their inner surface 11. Reference symbols used 10 facade surface elements 11 Interior of surface element 12 longitudinal groove 13 first undercut contour 14 second undercut contour 20 pairs of claw plates 21 first claw plate 21.1 first foot section 21.2 first undercut contour 21.3 first planting area 21.4 first end face section 22 second claw plate 22.1 second foot section 22.2 second undercut contour 22.3 second installation area 22.4 second end face section 30 train connectors 40 contact partners QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2022 001 666 A1

[0008]

Claims

[1] Facade fixing arrangement, comprising a facade surface element (10), a pair of claw plates (20) and a tension connector (30), wherein the facade surface element (10) has an inner surface (11) and a longitudinal groove (12) arranged on the inner surface of the surface element, which has a first undercut contour (13) and a second undercut contour (14), wherein the undercut contours (13, 14) are arranged on both sides of a longitudinal groove median plane orthogonal to the inner surface (11) of the surface element, wherein the pair of claw plates (20) comprises a first claw plate (21) and a second claw plate (22), wherein the first claw plate (21) comprises a first foot section (21.1) with a first undercut contour (21.2) and a rear first contact surface (21.3), and the second claw plate (22) comprises a second foot section (22.1) with a second undercut contour (22.2) and a rear second contact surface (22.3), and wherein the undercut contours (13, 14) are configured to correspond to the undercut contours (21.1, 22.2), wherein the tension connector (30) is configured to provide a tensile force between the claw plates (21, 22) that is parallel to the inner surface (11) of the surface element and orthogonal to the longitudinal groove (12), and wherein the pair of claw plates (20) is designed for a connection with trained by a liaison partner wherein the facade fastening arrangement is designed for a decoupling state and for a coupling state, In the decoupling state, there is no defined positional relationship between the facade surface element (10) and the pair of claw plates (20). In the coupling state, there is a positively locked defined positional relationship between the facade element (10) and the pair of claw plates (20), in that the first undercut contour (21.1) engages with the first undercut contour (13) forming a first longitudinally extended pressure contact surface, and the second undercut contour (22.2) engages with the second undercut contour (14) forming a second longitudinally extended pressure contact surface, and the first and second contact surfaces (21.3, 22.3) abut each other by means of the tension connector (30) forming a rearward pressure contact surface, and the decoupling state can be converted into the coupling state and vice versa by means of a pivoting of at least one of the claw plates (21, 22). [2] Facade fastening arrangement according to claim 1,characterized by , that the connecting partner (40) is designed as a longitudinal profile, the longitudinal axis of which is arranged parallel to the inner surface of the surface element (5). [3] Facade fastening arrangement according to one of the preceding claims, characterized by , that the undercut contours (13, 14) and the undercut contours (21.1, 22.2) are wedge-shaped. [4] Facade fastening arrangement according to one of the preceding claims, characterized by , that at least one of the claw plates 21, 22) has a foot-side end surface section (21.4, 22.4), which is present as the first end surface section (21.4) in the first claw plate (21) and as the second end surface section (22.4) in the second claw plate (22), wherein in the coupling state the respective end surface section (21.4, 22.4) rests against the inside of the surface element (11) forming a respective end pressure contact surface. [5] Facade fastening arrangement according to one of the preceding claims, characterized by that it has several pairs of claw plates (20, 20n) and several pull connectors (30, 30n).

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