Facade fastening arrangement

Abstract

The invention relates to a facade fastening arrangement having a facade panel element (10), a pair of claw plates (20) and a tension connector (30), wherein the facade panel element (10) has, on a panel element inner side (11), a longitudinal groove (12) which has a first undercut contour (13) and a second undercut contour (14), wherein the pair of claw plates (20) has a first claw plate (21) and a second claw plate (22), wherein the first claw plate (21) has a first bottom portion (21.1) with a first underside engagement contour (21.2) and a rear first support surface (21.3), and the second claw plate (22) has a second bottom portion (22.1) with a second underside engagement contour (22.2) and a rear second support surface (22.3), and wherein the undercut contours (13, 14) are designed to correspond to the underside engagement contours (21.1, 22.2), wherein the tension connector (30) is designed to apply a tensile force between the claw plates (21, 22), said tensile force acting parallel to the panel element inner side (11) and orthogonal to the longitudinal groove (12), and wherein, in a coupled state, there is an interlockingly secured positional relationship between the facade element (10) and the pair of claw plates (20) by virtue of the first underside engagement contour (21.1) being in engagement with the first undercut contour (13) and the second underside engagement contour (22.2) being in engagement with the second undercut contour (14).

Description

[0001] 09-07-2025-42921401-HauP tPo i-0013 PCT / DE2025 / 000076 Facade Fastening Arrangement The invention relates to a facade fastening arrangement for the secure fastening of flat facade cladding elements to buildings. Curtain wall facades formed by flat facade cladding elements are known from the prior art. Due to their advantages in terms of durability, attractive design, and building physics, such as the possibility of weatherproof insulation, they are widely used in the field of high-quality facades. According to the prior art, substructures are typically attached to the building wall, and the flat facade elements are attached to this substructure. Especially with large-area facade elements, it is necessary to fasten them across their surface at multiple points or to the substructure in order to adequately transfer both static and dynamic loads, particularly those caused by wind suction or pressure, and thus prevent deformation or structural failure of the large-area facade elements. It is known in 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 detract from the overall appearance of the facade. Solutions for visible rear fastenings, such as welded anchor bolts on the back of metal facade elements, are known.The thermal stress during welding can also unintentionally impair the appearance of the opposite surface, especially if it has a coating, due to the thermal stresses encountered in 09-07-2025-42921401-HauPtPcs t-0014 PCT / DE2025 / 000076 0338 / 25. While adhesive bonded rear fasteners overcome this, they are subject to strict monitoring regulations due to the significant risk of failure from falling facade elements and are therefore very expensive. A 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 a rear groove of a groove pair of a surface element. This creates an invisible and simultaneously form-fitting connection. This solution represents a recognized contribution to the state of the art, but at the same time requires precise coordination of the groove arrangement.the interlocking body and the substructure to each other. The object of the invention is to demonstrate, overcoming the disadvantages of the prior art, a solution for the concealed fastening of surface-forming, in particular large-area, facade elements to buildings, which exhibits a high degree of resistance even to possible thermal changes in length.which is adaptable to different geometries and sizes of both the facade elements and different designs of the substructure, enables simple and error-free assembly, and is cost-effective. The objective is achieved by the features listed in the patent claim. Preferred embodiments are described in the dependent claims. 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 panel element. 08-07-2025-42921401-HauPiP est-0015 PCT / DE2025 / 000076 0338 / 25 According to the invention, the facade fastening arrangement comprises the basic components of a facade panel element, a pair of claw plates, and a tension connector. For the purposes of the present invention, a facade panel element is understood to be any facade element thatthat forms the outer surface of a facade. In addition to its outer surface (hereinafter also referred to as the surface element exterior), the facade surface element has an inner surface, which is the visible reverse side of the surface element exterior. The facade surface element has a longitudinal groove on its inner surface. On both sides of a longitudinal groove center plane perpendicular to the surface element plane, undercut contours, designated as the first and second undercut contours, are arranged. Where numerical designations such as "second" or similar are used in the description and claims, this serves not to indicate a specific hierarchy or value, but for unambiguous identification and assignment. The longitudinal groove can thus preferably be a dovetail groove or a T-slot. An undercut contour is understood to be a shape contour of the longitudinal groove that forms an undercut; in this case, it is a recess projecting into the facade surface element.which can be positively engaged by a counter contour. The recess can be formed in particular as a chamfer, but also as another concave shape. Preferably, the first and the second cutting contours are identical and arranged as mirror images of each other about the longitudinal groove center plane. 09-07-2025-42821401-HauP Po si -0016 PCT / DE2025 / 000076 -, 4-The facade fastening arrangement according to the invention also includes a pair of claw plates as a key basic component. This pair is formed by the first claw plate and the second claw plate, which are preferably identical and can therefore be arranged in a mirrored configuration. Each claw plate has a foot section. This is a shaped section that has an interlocking contour. The interlocking contour is a projection – viewed from a plane of the plate – which, according to its geometry, forms an arrangement of the longitudinal groove such that it engages the respective undercut contour, enabling a positive locking position of a Z-axis relative to the plane of the surface element. Accordingly, the undercut contours of the longitudinal groove and the undercut contours of the claw plates are designed to correspond to each other.The foot section is understood to be the section of the respective claw plate that, according to its mounting position, is oriented towards the facade surface element. The opposite section is hereinafter also referred to as the head section. Furthermore, each claw plate has a rear surface which is hereinafter referred to as the first contact surface of the first claw plate and the second contact surface of the second claw plate. The tension connector is formed, creating a tensile force between the claw plates that is orthogonal to the inner surface of the surface element and to the plane of the claw plates. In a simple design, this can be a screw or rivet. The pair of claw plates forms a connection with a connecting partner. The connecting partner itself is part of the invention. 09-07-2025-42921401-Hâ. Up-tPôst“0017 PCT / DE2025 / 000076 0338 / 25 according to the facade fastening arrangement. This connection can preferably be made simultaneously via the tension connector. 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 has a direct connection to the connecting partner. A connecting partner within the meaning of the present invention is understood to be any component to which the facade surface element is bound in terms of its positional relationship and force transmission. The connecting partner is preferably the substructure of the facade. This can, for example, be a steel or aluminum construction placed in front of a building wall structure and anchored there, and preferably has horizontal longitudinal profiles on which the facade surface element is arranged plane-parallel. The pair of claw plates is preferably arranged on the longitudinal profiles and tensioned to them by the tension connector.According to the invention, the facade fastening arrangement is configured in a decoupling state and a coupling state. In the decoupling state, the components are either still or have been disassembled, and in particular, there is no defined positional relationship between the facade surface element and the pair of claw plates. In the coupling state, there is a fixed, form-fitting positional relationship between the facade surface element and the pair of claw plates. The positional relationship is established by the first undercut contour being aligned with the first undercut contour, forming a first longitudinally extended pressure contact surface, and the second undercut contour being aligned with the second undercut contour, forming a second longitudinally extended pressure contact surface, and the first and second contact surfaces being abutted against each other, forming a rear pressure contact surface. 0S-07-202S-42921401 -Hau P iPos ~ 0018 PCT / DE2025 / 000076 0338 / 25In the mounting position, the claw plates are arranged in opposite directions. Due to the opposing interlocking contours, which correspond to the undercut contours in the facade element, these form a specific interlocking connection. The geometries of the first and second foot sections, as well as the undercut contours of the longitudinal groove, are adapted so that the contours are arranged in relation to each other under pressure. The positioning between the pair of claw plates and the facade element is interlocking across translational and rotational degrees of freedom, with the exception of the translational degree of freedom of the longitudinal axis of the longitudinal groove. Here, the clamping action creates a frictional connection. This can be achieved through claw-shaped sections of the respective foot section or through serrations on the respective interlocking contour.Furthermore, the facade fastening arrangement according to the invention is designed such that it can be pivoted from the decoupling state to the coupling state and vice versa. Preferably, a claw plate is first arranged at the base section of the longitudinal groove such that the underengagement contour and the undercut contour are aligned. Subsequently, the second claw plate is positioned at an angle with its base section in the longitudinal groove. By subsequently pivoting the second claw plate towards the first claw plate, which applies a clamping force, the rear contact surfaces of both claw plates come into contact with each other, positioning the claw plates relative to each other and to the facade surface element. The contact surfaces support each other in the area of ​​the two base sections and press the underengagement contours against the undercut contours. 03-07-2025-42921401-H au Po - 0018 PCT / DE2025 / 000076 -. 7 -The facade fastening arrangement according to the invention features, in particular, the following: external fastening, so that there are no restrictions on design specifications in this respect. Furthermore, the positive locking coupling of both the perpendicular to the facade surface plane and the transverse axis to the longitudinal groove axis. This provides a reliable and robust coupling. Furthermore, the force-lock coupling along the longitudinal groove allows for stepless positional adjustment of the arrangement of the fastening points along this axis. In addition, this enables longitudinal displacement in special applications to adapt to thermal expansion and the significant temperature fluctuations, especially on sun-exposed facades. Moreover, it allows for adaptation to different substructures by selecting the arrangement of the longitudinal grooves.The ability of the claw plates to fit the longitudinal grooves and the choice of the length and height of the claw plates. This results in simple and precise alignment of the facade panels with good joint appearance. Furthermore, several longitudinal grooves with multiple pairs of claw plates can be provided. In addition, the longitudinal grooves can be arranged both transversely and diagonally to each other. For special applications with a diagonal longitudinal groove, fine adjustment of the transverse direction is also possible by longitudinally shifting the respective pair of claw plates in the longitudinal groove. 09-07-.2025-4292140 -Hau P iPo -0020 PCT / DE2025 / 000076 Furthermore, it has been found that the facade fastening arrangement according to the invention is particularly applicable to facade surface elements of low thickness.For example, a reliable, form-fitting connection can be achieved with a longitudinal groove depth of only 2 mm. This allows facade elements with a material thickness of, for example, only 2-4 mm to be reliably concealed. There are also no limitations regarding greater groove depths or greater material thicknesses of the facade elements. Furthermore, the low cost is a significant advantage. The claw plates can be produced cost-effectively from simple bent stamped parts or by cutting extruded profiles to length. This allows for precise formation, especially of the foot section with the interlocking contour. They can be produced cost-effectively from bar stock. By practically selecting the length when cutting to length, the claw plates can be adapted to a wide range of load-bearing capacities. For high load capacities, claw plates with very large widths can also be used, which can be several times their height. Claw plates with large widths can therefore transmit correspondingly higher forces. The simple installation is another advantage.which can be done without special tools and is resistant to execution errors, since the reliable fastening of the claw plate pair is ensured by its geometry in connection with the geometry of the longitudinal groove without relying on specific torques or other stresses. Furthermore, the facade fastening arrangement according to the invention can be disassembled and reassembled without damage. According to a further development, the facade fastening arrangement is characterized in that the connecting partner is a longitudinal profile whose longitudinal axis is arranged towards the inside of the surface element. According to this further development, the claw plate pair can be easily attached to the longitudinal profile. In addition, several claw plate pairs can also be arranged at selectable intervals of the longitudinal groove and attached to the longitudinal profile. According to a further development, the facade fastening arrangement is characterized in that...that the undercut contours and the interlocking contours are formed. The dovetail connection thus producible enables a particularly reliable coupling via the wedge flanks, also in the longitudinal direction of the longitudinal groove. The wedge shape creates an undercut that exerts a clamping force perpendicular to the plane of the facade surface element in the direction of the claw plates. According to a further development, 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 forms a respective end pressure contact surface on the inside of the surface element. Particularly in connection with the above development,The wedge-shaped cutting contours and the interlocking contours are formed by the vertically acting contact pressure, which pulls the facade surface element with its inner facade element side against the end surface sections, creating a vertical positional relationship between the claw plates and the facade surface element. Furthermore, the forces acting perpendicular to the facade surface element plane result in wind pressure via the end contact surface on the surface. 09-07-2025-42921401 -HauP iPo si-0022 PCT / DE2025 / 000076 -10-, 0338 / 25The force is transferred to the inside of the element and via the base of the longitudinal groove. This prevents visually unappealing bulges on the visible side, especially in very thin facade elements, such as those constructed from aluminum composite panels. A further development of the facade fastening arrangement is characterized by the fact that it has several pairs of claw plates and several tension connectors. According to this development, force transmission and positioning between the substructure and the facade element can occur at a plurality of point or line positions.The invention is described in more detail by reference to an embodiment shown in the following figures: Isometric view in the decoupling state 2 Isometric view in the coupling state 3 Enlargement of a first foot section 4 Enlargement of a second foot section 5 Sectional view in the coupling state 6 Illustration of an assembly sequence 7 Schematic view with several pairs of claw plates 08-07-2025-42821401-H au p pd t-0023 PCT / DE2025 / 000076 1 Here, identical reference numerals in the different figures refer to the same features or The reference numerals are also used in the description if the respective figure shows an embodiment in a decoupling state and 2 the same embodiment in a coupling state. Therefore, the and 2 are described together below.In the exemplary embodiment, a facade surface element 10, designed as an aluminum composite panel with a material thickness of approximately 6 mm, has a longitudinal groove 12 of 4 mm depth on its inner surface 1, visible on the facade. The pair of claw plates 20 comprises a first claw plate 21 and a second claw plate 22. The claw plates 21, 22 are made from an aluminum strand and have been cut to the desired width. Both claw plates 21, 22 are identical but, due to their opposing arrangement, exhibit different orientations of the first foot section 21.1 of the first claw plate 21 and the second foot section 22.1 of the second claw plate 22. Due to the extruded profile, the foot sections 21.1, 22.1 have a very precisely shaped wedge-shaped first gripping contour 21.2 on the first claw plate 21 - and second gripping contour 22.2 - on the second claw 22 - the first contact surface 21 lies in the coupling state.3 and the second contact surface 22.2 abut each other and the undercut contours 22.1 are in the longitudinal groove - shown 5 - the contact surfaces 21 22.3 support each other, especially in the zone of the foot sections 21 22.1, and are in contact there with the undercut contours 14 - shown 5 - in the coupling state. There is a rear pressure contact surface 03-07-2025-42321401-Hau pPos t-0024 PCT / DE2025 / 000076 12- 0338 / 25. Figures 3 and 4 show enlarged sections of the end surface sections 21.4 also present in this embodiment, wherein the first claw plate 21 has the first end surface section 21.4 and the second claw 22 has the second end surface section 22.4. The end surface sections 21.4, 22.4 are supported in the coupling state on the inner surface of the surface element 1, so that an exact positioning perpendicular to the surface element plane is created. Furthermore, compressive forces acting on the facade surface element can be dissipated via the end-face pressure contact surfaces thus formed, and undesirable force input onto the longitudinal groove base, which could lead to bulges on the visible side, can be avoided. In section 5, the contour of the longitudinal groove 12 and the interaction of the foot sections 21.1, 22.1 are shown in a sectional view. The first undercut contour 13 corresponds to the first undercut contour 21.2 and the second undercut contour 14 to the second undercut contour.The mirrored wedge-shaped design, a dovetail-like coupling 6, the coordinated nature of the geometries of the longitudinal groove 12 and the claw plates 21, 22, which makes it possible to transition from the decoupling state to the coupling state and vice versa by simply pivoting at least one claw plate 21 or 22. During positioning, the facade surface element 10 and the claw plates 21, 22 are in a fixed positional relationship. During positioning, the first foot section 21.1 is inserted into the longitudinal groove 12, and the second claw plate 22, with its second foot section 22.1, is still outside the longitudinal groove. 09-07-2025-42921401 -MainPost-0025 PCT / DE2025 / 000076 13-0338 / 25 During positioning, the second foot section 22 is also now outside the longitudinal groove.1 the longitudinal groove 12 is inserted, whereby both claw plates 21, 22 are tilted away from each other. For positioning, both claw plates 21, 22 are now pivoted proximally towards each other, so that their rear contact surfaces 21.4, 22.4 initially support each other in the area of ​​the foot sections 21.1, 22.1 and the undercut contours 21.2, 22.2 increasingly press the undercut contours 14 of the longitudinal groove. the positioning now the coupling state The claw plates22 are each located with their contact surfaces 21 22.4 contact and the form fit as well as the longitudinal groove axis of the frictional locking 7 Exemplary embodiment of a facade fastening arrangement, which, in addition to the claw plate pair 20 and the associated tension connector 30, also allows further claw plate pairs 20n with each associated tension connector 30n to fasten even particularly large-format facade surface elements 10 to their surface element inner side 11.

[0002] 09-07-2025-42921401-Main tPos 4-0026 PCT / DE2025 / 000076 0338 / 25 Reference symbols used: 10 Facade surface element 1 Surface element interior 12 Longitudinal groove 13 First undercut contour 14 Second undercut contour 20 Claw plate pair 21 First claw plate 21.1 First foot section 21.2 First interlocking contour 21.3 First contact surface 21 First end surface section 22 Second claw plate 22.1 Second foot section 22.2 Second interlocking contour 22.3 Second contact surface 22.4 Second end surface section 30 Tension connector 40 Connecting partner

Claims

08-07-2025-42321401-HauP Post-0028 PCT / DE2025 / 000076 15- Claims 1 Facade fastening arrangement comprising a facade surface element, a pair of claw plates, and a tension connector, wherein the facade surface element has an inner surface and a longitudinal groove arranged on the inner surface, the groove having a first undercut contour (13) and a second undercut contour, wherein the undercut contours 14) are arranged in a longitudinal groove median plane orthogonal to the inner surface of the surface element, wherein the pair of claw plates has a first claw plate and a second claw plate, wherein the first claw plate has a first foot section with a first undercut contour (21.2) and a rear first contact surface, and the second claw plate has a second foot section with a second undercut contour and a rear second contact surface, and wherein the undercut contours 14) to the undercut contours 22.2) each correspondingly formed wherein the tension connector is formed to provide a tensile force orthogonal to the inside of the surface element and to the longitudinal groove (12) between the claw plates 22) and wherein the pair of claw plates (20) forms a connection with a connecting partner, wherein the facade fastening arrangement forms a decoupling state and a coupling state in the decoupling state there is no defined positional relationship between the facade surface element and the pair of claw plates in the coupling state there is a positively locked defined positional relationship between the facade element and the pair of claw plates (20). y ä t _ Ua-u / i-haup pds t“ uutdPCT / DE2025 / 000076 -16- 0338 / 25 consists of the first undercut contour (21.1) being connected to the first cutting contour forming a first longitudinally extended pressure contact surface and the second undercut contour (22.2) being connected to the second undercut contour forming a second longitudinally extended pressure contact surface, as well as the first and the second contact surface 22.3) of the tension connector abut each other forming a rear pressure contact surface and wherein, by pivoting at least one of the claw plates 22), the decoupling state can be converted to the coupling state and vice versa. Facade fastening arrangement according to claim characterized in that the connecting partner is a longitudinal profile whose profile longitudinal axis is arranged to the inside of the surface element. Facade fastening arrangement according to one of the preceding claims, characterized in that the undercut contours 14) and the underengagement contours 22.2) are formed. Facade fastening arrangement according to one of the preceding claims, characterized in that at least one of the claw plates 21, 22) has a foot-side surface section which is the first end face section (21.4) of the first claw plate (21) and the second end face section of the second claw plate, wherein the coupling state is the respective end face section 22.4) under training. 09-07-2025-42921401 - Main tPcs i-0030 PCT / DE2025 / 000076 17-0338 / 25 of a respective end-pressure contact surface on the inside of the surface element (11) facade fastening arrangement according to one of the preceding claims, characterized in that it has several pairs of claw plates 20n) and several tension connectors 30n). Three pages of drawings are attached.

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