Fastener for mounting wall panels to a wall structure and a system comprising a wall panel and a fastener

Abstract

The present invention relates to a two-piece fastener for mounting walls panels to a mounting surface such as a wall e.g. for either decorative or isolating purposes. The present invention also relates to a system comprising both a wall panel and a fastener. In particular, the invention relates to a fastener for a wall panel (1) comprising a bend or crease along a mounting edge to be mounted on a mounting surface (2), which fastener comprises a first piece (3) comprising a base part (5) which base part (5) comprises a top surface and a lower surface, the top surface faces away from the mounting surface (2) after mounting and the lower surface is in contact with the mounting surface (2) after mounting, and a fastening part (6) extending from the top surface of the base part (5) and comprising either an opening or a protrusion (7) configured to interact with a corresponding part (8) of a wall panel (1), and a second piece (4) comprising a first surface (9) or wall configured to be parallel to a corresponding surface (10) or wall of the bend or crease of a wall panel (1) when the wall panel (1) is in a mounted position, and the first surface (9) or wall is configured to be in contact with and / or to exercise a pressure on the corresponding surface (10) of the wall panel (1) after mounting, wherein the first piece (3) and the second piece (4) comprises interconnecting secondary fastening parts (15A, 15B) comprising corresponding click parts (13), the corresponding click parts (13) are configured to fix or secure the position of the second piece (4) relative to the first piece (3).

Description

[0001] The present invention relates to a two-piece fastener for mounting walls panels to a mounting surface such as a wall e.g. for either decorative or isolating purposes. The present invention also relates to a system comprising both a wall panel and a fastener.Background of the invention

[0002] It is generally known to mount metal wall panels to facades and before mounting it is normally needed to process the metal wall panels in various ways e.g. by cutting, drilling, milling, and / or bending. Installation can then be done with screws, rivets and glue as flat panels, or as different types of cassette solutions, where the metal wall panels have been processed with substantial work effort and machinery in workshops.

[0003] This is to obtain a desired look or expression of a building.

[0004] However, these types of processing and installation of the wall panels are very expensive in such cost as energy (electricity) labor intensive (manpower), and transport cost of cassettes to construction site. In most cases, it is not possible to reinstall already mounted metal wall panels without destroying either panels and / or sub-construction.

[0005] Even small reductions in the process in workshop, where drilling, better transport optimization, less manual labor during installation is considered as a significant improvement and will result in a more cost effective and sustainable use of materials.

[0006] US 2015 / 0292215 A1 discloses a system for mounting a plurality of wall panels to a supporting structure which system includes a plurality of fasteners. The wall panels according to the disclosed system include a main panel and at least one L-shaped end section. Each of the fasteners include a base section having spaced apart walls providing an opening therebetween. Opposing U-shaped sections are arranged coupled to the first and second walls generally facing each other. A securing section is arranged outwardly of one of the U-shaped sections for attaching the fastener to a supporting structure. The U-shaped sections respectively receive a portion of an L-shaped end section of adjacent wall panels. According to the embodiments shown in figures 2-13, the wall panels are kept in position after mounting because neighbouring wall panels exercise a pressure at each other. However, this is a problem when a wall panel needs to be replaced as it is difficult to remove a single wall panel. According to the embodiments shown in figures 14-17 two separate fasteners are positioned at a distance corresponding to a separate spacer member (78, 82), this system is complicated to mount making it necessary to fasten two individual fasteners as well as the spacer member before mounting the wall panels.

[0007] US 9834941 B1 discloses a thermal break system for securing wall panels to a wall. The fastener comprises a base section (26) seated against a mounting surface, and a U-shaped channel member (42) is positioned between bend ends of wall panels (12) and fastened with a screw (48) to the mounting surface.

[0008] GB 2135355 A discloses a cladding constituted of a basal attachment section 4 and a longitudinally extending insert member (9) attached by a screw (11).

[0009] Hence, a system and a fastener allowing simpler and faster mounting of wall panels would be considered a significant improvement.Summary of the invention

[0010] Thus, an object of the present invention relates to provide a system and fastener which makes it simpler and therefore faster to mount wall panels.

[0011] Thus, a first aspect of the invention relates to a fastener for a wall panel (1) comprising a bend or crease along a mounting edge to be mounted on a mounting surface (2), which fastener comprises a first piece (3) comprising a base part (5) which base part (5) comprises a top surface and a lower surface, the top surface faces away from the mounting surface (2) after mounting and the lower surface is in contact with the mounting surface (2) after mounting, and a fastening part (6) extending from the top surface of the base part (5) and comprising either an opening or a protrusion (7) configured to interact with a corresponding part (8) of a wall panel (1), and a second piece (4) comprising a first surface (9) or wall configured to be parallel to a corresponding surface (10) or wall of the bend or crease of a wall panel (1) when the wall panel (1) is in a mounted position, and the first surface (9) or wall is configured to be in contact with and / or to exercise a pressure on the corresponding surface (10) of the wall panel (1) after mounting, wherein the first piece (3) and the second piece (4) comprises interconnecting secondary fastening parts (15A, 15B) comprising corresponding click parts (13), the corresponding click parts (13) are configured to fix or secure the position of the second piece (4) relative to the first piece (3).

[0012] According to any embodiment of the first aspect, the click parts (13) may comprise a first part comprising a track or a plurality of depressions and a corresponding second part comprising a protruding part or a plurality of protrusions and which corresponding click parts (13) guide and / or lock the first piece (3) and the second piece (4) relative to each other.

[0013] According to any embodiment of the first aspect, the interconnecting secondary fastening parts (15A, 15B) may comprise flexibly mounted corresponding parts extending either from the first piece (3) or from the second piece (4), or from both the first piece (3) and the second piece (4). The flexibility of the mounting may originate from a point of the secondary fastening part or from a length of the secondary fastening part. E.g. the thickness of the material or the material itself is adapted to provide a suitable flexibility.

[0014] According to any embodiment of the first aspect, at least a part of the fastening part (6) may extend from the top surface of the base part (5) in a direction perpendicularly to lower surface of the base part (5).

[0015] According to any embodiment of the first aspect, at least one or both or all fastening part(s) (6) may be flexibly mounted to the base part (5) of the first piece (3).

[0016] According to any embodiment of the first aspect, at least one of the interconnecting secondary fastening parts (15A, 15B) of the second piece (4) may be flexibly mounted to a body or a connecting part of the second piece (4).

[0017] According to any embodiment of the first aspect, the second piece (4) of the fastener may comprise a body having a U-shaped comprising a connecting part or a rectangular profile cross-section. As the second piece (4) normally is a long unit provided by extrusion, the connecting part or the rectangular profile showing at a cross-section is actually surfaces extending in the longitudinal direction of the second piece (4). The body having a U-shaped or rectangular profile cross-section, may comprise at least two arms or parts extending in the direction of the base part (5) after mounting, and the corresponding click parts (13) of the second piece (4) are positioned on or at the at least two arms or parts. Alternatively, the corresponding click parts (13) of the second piece (4) may be positioned on or at the body having a U-shaped comprising a connecting part or a rectangular profile cross-section.

[0018] According to any embodiment of the first aspect, the corresponding click parts (13) of respectively the first piece (3) and the second piece (4) in a mounted state may comprise corresponding contact surfaces angled perpendicular to the direction of movement or shaped with corresponding concave and convex surfaces.

[0019] According to any embodiment of the first aspect, the first piece (3) and / or the second piece (4) can be made of extruded material such as an aluminium alloy or of another material such as a polymer e.g. an elastomer polymer and has a constant cross-sectional profile through-out its length.

[0020] According to any embodiment of the first aspect, the fastening part (6) extending from the base part (5) may comprise a protrusion (7) interacting with a corresponding opening (8) of a wall panel (1) and the protrusion may have a triangular or convex profile. The profile of the protrusion (7) of the fastening part (6, 14) may be a right triangle or right-angled triangle where one side constituting a leg or the base of the triangle faces the top surface of the base part (5) after mounting and the second side constituting the second leg or the height of the triangle faces the fastening part (6).

[0021] According to any embodiment of the first aspect, the second piece (14) may be exclusively locked to the first piece (3) and not be fastened to the mounting surface (2) by fastening means (11).

[0022] According to any embodiment of the first aspect, the second piece (4) may comprise one, two, three or four secondary fastening parts (15A), and the first piece (3) may comprise at least same number of corresponding secondary fastening parts (15B).

[0023] According to any embodiment of the first aspect, each secondary fastening part (15A, 15B) may comprise one or two click parts (13), if the secondary fastening part (15A, 15B) comprises two click parts (13) then the click parts (13) may preferably be positioned on opposite sides / positions of the secondary fastening part (15A, 15B).

[0024] According to any embodiment of the first aspect, the fastener may comprise fastening means (11) such as screws or glue or rivets which fastening means (11) after mounting are configured to secure at least the first piece (3) to the mounting surface (2).

[0025] According to any embodiment of the first aspect, the first piece (3) comprising the base part (5) may comprise two fastening parts (6) extending from the base part (5) which two fastening parts (6) in a longitudinal direction and at a cross-section mirrors each other.

[0026] According to any embodiment of the first aspect, the second piece (4) of the fastener may comprise a fastening part (14) comprising either an opening or a protrusion (14) for interacting with a corresponding part (8) of a wall panel (1).

[0027] According to any embodiment of the first aspect, the first and / or the second piece (3, 4) comprise(s) an extending base part or wing (16) constituting a suitable surface for fastening means (11).

[0028] According to any embodiment of the first aspect, the first piece (3) may comprise a panel support part (20) comprising a surface extending in a direction substantially parallel to the mounting surface (2) and providing a contact surface for a wall panel (1) when a bend or crease of the wall panel (1) is pushed into mounted position relative to the first piece (3).

[0029] A second aspect the invention relates to a system comprising a fastener according to the first aspect and one or more wall panels (1) secured to a mounting surface (2) by the fastener which wall panels (1) comprises a bend or crease along one or more mounting edge(s).

[0030] According to any embodiment of the second aspect, the first piece (3) of the fastener may be secured to a mounting surface (2), a wall panel (1) may then be positioned relative to the first piece (3) and at last the second piece (4) may be secured at least to the first piece (3) and preventing removal of the wall panel (1).Brief description of the figures

[0031] Figure 1 shows a first embodiment of a fastener according to the invention. Figure 2 shows a second embodiment of a fastener according to the invention. Figure 3 shows a third embodiment of a fastener according to the invention. Figure 4 shows a fourth embodiment of a fastener according to the invention. Figure 5A and 5B show a fifth embodiment of a fastener according to the invention. Figure 6A and 6B show a sixth embodiment of a fastener according to the invention. Figure 7 shows a seventh embodiment of a fastener according to the invention. Detailed description of the invention Definitions

[0032] Prior to discussing the present invention in further details, the following terms and conventions will first be defined: In general - if this expression is used when mentioning a feature relating to the present invention, it must be understood that the feature may be used with all embodiments of the invention, even if the mentioning is made in the detailed part of the document. Click parts - click parts are defined by corresponding parts which interlock, i.e. the corresponding parts becomes locked together or interconnected, when the corresponding parts are pushed or forced together i.e. towards each other. As a result, click parts may be joined and locked to each other without using separate fastening means such screws, rivets, glue or the like. Flexibly mounted or attached - That a part is flexibly mounted means that the part has at least two states or positions, a relaxed state where the part is positioned when it is not subjected to an external force and a biased state or position where the part is positioned when it is subjected to an external force, and the part will return from the biased to the relaxed state or position when not subjected to an external force as it is elastic or elastically mounted.

[0033] It should be noted that embodiments and features described in the context of one of the aspects of the present invention also apply to the other aspects of the invention.

[0034] Same reference numbers are used for different embodiments for same or similar parts.Wall panels

[0035] Normally, wall panels to be mounted according to the invention are composite panels e.g. comprising an outer layer made of a metal such as aluminium providing strength and a desired visual appearance, a core normally providing some kind of isolation such as thermal or acoustic isolation or fire-retardant effect, e.g. comprising a thermoplastic resin or a mineral filled polymer, and an inner layer or backing sheet e.g. of a metal such as aluminium providing a protection for the core material. However, wall panels may also be constituted of a single layer such as a metal layer.

[0036] Alternatively, the wall panels to be mounted according to the invention may be massive plates e.g. comprising a layer of metal such as aluminium or comprising a layer of another material having ornamental or isolating properties.

[0037] Preferably, the wall panels should have high impact resistance, high rigidity, and low weight. The construction of the wall panels is not part of the invention as such, and the wall panels may be acquired commercially.

[0038] Wall panels may be delivered to the mounting site as flat pieces, optionally pre-processed with milled lines along one or more of the edges making it possible to bend the mounting edges to a desired angle, which is normally an angle between 90 and 135 degrees. Also, the wall panels may be pre-processed at the mounting site e.g. by milling or bending / folding or curving or the like.

[0039] Further, the wall panels may be provided with cuts, drillings, punchings and / or stampings necessary for mounting of the wall panels, either at the site for mounting or before arriving at the mounting site.

[0040] In general, a wall panel 1 to be fastened by a fastener according to the invention may have the form of a cassette i.e. the wall panel 1 is formed from a rectangular plate where all four edges are bend to the same side or direction in such a way that the wall panel 1 forms an open box i.e. a box without a lid. Alternatively, only one or two or three sides of a rectangular wall panel 1 is bend, or the wall panel 1 may be of a different shape than rectangular.

[0041] According to a first aspect, the invention relates to a fastener for a wall panel 1 which wall panel 1 is to be mounted onto a mounting surface or wall 2 and which wall panel 1 comprises a bend or crease along a mounting edge i.e. the wall panel 1 is not flat.

[0042] In general, the fastener is a two-piece fastener comprising a first piece (3) to be secured to the mounting surface (2) and a second piece (4) to be secured either to the first piece (3) or to both the first piece (3) and the mounting surface (2).

[0043] In general, the fastener is configured to secure one, two or more wall panels (1) to a mounting surface (2), and also the fastener, especially the second piece (4) of the fastener, may be configured to add an ornamental aspect to the outer surface of a wall covered fully or partly with wall panels (1) e.g. by protruding from the surface formed by the wall panels (1) or by colour or structure.

[0044] Fig. 1 shows a first embodiment of a fastener according to the invention, the first embodiment is shown in a state where the fastener has been secured to a mounting surface or wall 2 and a wall panel 1 has been attached to the fastener.

[0045] The fastener of the first embodiment comprises two pieces: a first piece 3 and a second piece 4, both the first and the second piece are extruded i.e. each piece 3, 4 constitutes a long unit with a constant profile / cross-section which may extend in the complete length of one or more mounted wall panels 1.

[0046] Within the wall panel industry, "the first piece", being the unit that is attached to the mounting surface 2, is often referred to as a "bottom profile" or a "base profile".

[0047] The first piece 3 comprises a base part 5 comprising a top surface and a lower surface which top surface faces away from the mounting surface 2 after mounting and which lower surface faces and is in contact with the mounting surface 2 after mounting of the fastener. The base part 5 also comprises a fastening part 6 which is adapted to interlock with the wall panel 1 and fix the position of the wall panel 1. The fastening part 6 extends from the base part 5 in a 90 degrees angle and comprises a protrusion 7 which after mounting of a wall panel 1 interacts with a corresponding opening 8 of a wall panel 1 and fix the position of the wall panel 1. The fastening part 6 may extend from the base part 5 in a different angle such as an angle between or equal to 45 and 135 degrees. The corresponding opening 8 in the wall panel 1 may be a groove made by milling. Alternatively, the fastening part 6 may comprise an opening 7 interacting with a corresponding protruding part of the wall panel 1.

[0048] The first piece 3 is fastened to the wall 2 by fastening means 11. According to the embodiment of fig. 1, the fastening means 11 comprises three screws 11, and the base part 5 of the first piece 3 comprises two wings 16 extending respectively to the left and to the right of the fastening means 6 and the wings 16 are adapted to be in close contact with the surface of the wall 2 after mounting. A screw 11 may be inserted through each of the wings 16 while a screw 11 may optionally be inserted through the base part 5 between the two fastening parts 6. The screws 11 fastening the first piece 3 to the mounting surface are not necessarily placed in line or a specific cross-section as shown in the figure, a plurality of screws 11 can be placed offset relative to each other in the longitudinal direction of the first piece 3.

[0049] The first piece 3 comprises two longitudinally extending grooves or tracks constituting a first part of a click part 13. Alternatively, the first part of the click part 13 may comprise through-going openings or depressions in a different form than a groove e.g. a series of round or oval openings or depressions.

[0050] The second piece 4 comprises a first surface or wall 9 which first surface or wall 9 is parallel or approximately parallel to a corresponding surface 10 or wall of the bend or crease of a wall panel 1 when the wall panel 1 is mounted. The corresponding surface 10 comprises an opening 8 corresponding to a protruding part 7 of the fastening parts of the first piece 3. The first surface or wall 9 normally exercise a pressure on the corresponding surface 10 or is at least in contact with the corresponding surface 10 of the wall panel 1 and / or lock the part of the wall panel 1 comprising the corresponding surface or wall 10 in a secure position.

[0051] The second piece 4 according to the first embodiment has a U-shaped cross-section comprising two legs and a connecting part securing the two legs to each other, and the two legs constituting part of the U-shaped cross-section is in fig. 1 facing downwards i.e. towards the top surface of the base part 5 while the connecting part is positioned furthest away from the base part 5. The second piece 4 may be made of a flexible material or comprises flexibly mounted legs which may exercise a sideward pressure towards the bend edge of the wall panel 1 after mounting, and which material is flexible enough to give in and not break if the second piece 4 is subjected to a sideward opposite pressure from the bend edges of the wall panel 1. Such a sideward opposite pressure may occur when the wall panels 1 are subjected to thermal expansion.

[0052] The second piece 4 comprises two longitudinally and linearly extending protrusions constituting a corresponding second part of a click part 13. Alternatively, the second part of the click part 13 may comprise protruding parts in a different form than a linear protrusion e.g. round or oval protrusions. According to the embodiment of fig. 1, the second part of the click part 13 is constituted of the end of the legs of the U-shaped part.

[0053] Further, the second piece 4 is after mounting placed on top of the base part 5 of the first piece 3 between the two fastening parts 6, and the base part 5 is consequently placed between the second piece 4 and the wall 2.

[0054] A third screw 11 may be inserted through the base part 5 between the two fastening parts securing e.g. both the first piece 3 and the second piece 4 in the mounted position. The second piece 4 may then comprise a series of openings in the connecting part and a thread making it possible to secure the second piece 4 to the base part 5 of the first piece in the complete length of the first and second piece 3, 4.

[0055] The first embodiment of the fastener shown in fig. 1 may be used for mounting a wall panel according to the following method: 1 st< step: A first piece 3 of the fastener is mounted on mounting surface 2 using fastening means 11. The mounting of the first piece 3 of the fastener may be done by first fastening one central fastening means 11, where after the position of the first piece 3 and the fastening means 11 can be adjusted. Then the remaining first piece 3 fastening means 11 shown as central in the cross section of first piece 3 may be mounted. Then the remaining fastening means 11 are mounted through the wings 16 of the first piece 3 constituting a part of the base part 5. 2 nd< step: After having mounted all first pieces 3 of the fastener on the mounting surface 2, a pre-processed wall panel 1 which has been folded along all four edges to look like a cassette is provided. The bend edges of the wall panel 1 is put into position along the fastening part 6 of the first piece 3, whereafter the bend edge of a neighboring wall panel 1 cassette can is mounted in the same way. 3 rd< step: At last, a second piece 4 in a U-shape comprising legs pointing towards the base part 5 of the first piece 3 during mounting is pushed into positioned in between two corresponding surfaces of wall panels 10, the second piece 4 is then guided into place by means of the tracks constituting the first part of the click parts 13,which click parts 13 may also lock the second part 4 into position. The second piece 4 may be further secured to the wall 2 by fastening means 11 e.g. comprising screws 11 inserted through the U-shaped cross-section and through the base part 5.

[0056] The advantage is that mounting of the wall panels become simpler and easier, as only the first piece 3 of the fastener needs to be attached to the wall before mounting the wall panels. After having positioned a group of wall panels in the mounted position, e.g. a line of wall panels, the mounting of the group of wall panels 1 may be finalized by adding a neighbouring fastener and wall panel. The wall panels may be secured to the at first pieces 3 of the fastener in a simple way without using tools before the wall panels are to be secured to the fasteners by the second piece 4 and the fastening means securing the second piece 4 to the wall.

[0057] Fig. 2 shows a second embodiment of a fastener according to the invention, the second embodiment is like the embodiment of fig. 1 also shown in a state where the fastener has been secured to a mounting surface 2 and a wall panel 1 has been attached to the fastener.

[0058] The fastener of the second embodiment comprises two pieces: a first piece 3 and a second piece 4, and again both the first and the second piece 3, 4 are extruded i.e. each piece 3, 4 constitutes a long unit which may extend in the complete length of one or more mounted wall panels 1.

[0059] The first piece 3 of the second embodiment shown in fig. 2, is identical to the first piece 3 of the first embodiment shown in fig. 1 and is fastened in the same way to the mounting surface 2.

[0060] The second piece 4 is similar to the second piece of fig. 1 but is mounted differently. The second piece 4 also has a U-shaped cross-section comprising two legs and a connecting part securing the two legs to each other, however, the two legs constituting part of the U-shaped cross-section is in fig. 2 facing upwards i.e. away from the base part 5 and the connecting part of the U-shaped cross-section is positioned closest to the base part 5. The second piece 4 may be made of a flexible material or the legs may be flexibly mounted to the connecting part which makes it possible for the second piece 4 to exercise a sideward pressure towards the bend edge of the wall panel 1 after mounting, and which material is flexible enough to give in and not break if the second piece 4 is subjected to a sideward opposite pressure from the bend edges of the wall panel 1. The second piece 4 is after mounting placed on top of the base part 5 of the first piece 3 between the two fastening parts 6, and the base part 5 is consequently placed between the second piece 4 and the mounting surface 2.

[0061] The second piece 4 of this embodiment also comprises two longitudinally and linearly extending protrusions constituting a second part of a corresponding click part 13, however, the protrusions constituting the corresponding click parts are positioned at the end of the connecting part of the U-shaped cross-section. Also, the second part of the click part 13 according to this embodiment may comprise protruding parts in a different form than a linear protrusion e.g. a series of round or oval protrusions.

[0062] The screw 11 shown positioned between the legs of the U-shaped cross-section is optional and the presence of the screw may depend on the rigidity of the material constituting the second piece 4.

[0063] To protect and close the opening between two neighbouring wall panels, the gap between two neighbouring wall panels and between the two legs of the second piece 4 may be filled with a filling material 12 preventing e.g. water from penetrating into the space between the wall panels 1 and the wall 2.

[0064] The second embodiment of the fastener shown in fig. 2 may be used for mounting a wall panel according to the following method: 1 st< step: A first piece of the fastener 3 is mounted on wall 2 using fastening means 11 in the same way as described in connection with the first embodiment. 2 nd< step: Wall panels 1 formed as cassettes are provided and mounted as described for the first embodiment. 3rd step: A second piece 4 having a U-shape comprising legs pointing away from the base part 5 of the first piece 3 during mounting is positioned in between two corresponding surfaces 10 of wall panels 1, the first surface or wall 9 of second piece 4 is guided into place and locked into position by means of the tracks formed as corresponding click parts of first and second piece 13. The second piece 4 may then be further secured to the wall 2 by the central fastening means 11 and finally, a soft filling material 12 may be added to assure a certain look and / prevent the ingress of water.

[0065] Fig. 3 shows a third embodiment of a fastener according to the invention, the third embodiment comprises two neighbouring fasteners shown in a state where the two neighbouring fasteners are secured to a mounting surface 2 and a wall panel 1 has been attached to two neighbouring fasteners. Each fastener of the third embodiment comprises two pieces: a first piece 3 and a second piece 4, both the first piece 3 and the second piece 4 are advantageously prepared by extrusion i.e. each piece 3, 4 constitutes a long unit with a constant profile / cross-section which may extend in the complete length of one or more mounted wall panels 1. The two neighbouring fasteners of the third embodiments have profiles which are mirrors of each other, i.e. the first piece 3 comprises a wing 16 extending to the left for the first fastener and to the right for the second fastener, but alternatively, two neighbouring fasteners with a profile / cross-section as shown in fig. 3 may also be identical, i.e. both first pieces 3 of the fastener comprises a wing 16 extending either to the left from the fastening part 6 or to the right from the fastening part 6.

[0066] The first piece 3 is of an overall L-shape and comprises a base part 5 being in contact with the mounting surface 2 when the fastener is mounted on the mounting surface 2, and a fastening part 6 extending from a position at a first end of the base part 5. The fastening part 6 extends from the base part 5 in a 90 degrees angle and comprises a protrusion 7, after mounting of a wall panel 1 the protrusion 7 interacts with a corresponding opening 8 of the wall panel 1. The fastening part 6 may extend from the base part 5 in a different angle such as an angle between or equal to 45 and 135 degrees. The corresponding opening 8 in the wall panel 1 may be a groove made by milling. Alternatively, the fastening part 6 may comprise an opening 7 interacting with a corresponding protruding part of the wall panel 1.

[0067] The first piece 3 is fastened to the mounting surface 2 by fastening means 11. According to the embodiment of fig. 3, the fastening means 11 comprises one screw 11, inserted through a wing 16 extending respectively to the right from the fastening part 6 of the first fastener and to the left from the fastening part 6 of the second fastener. The screws 11 are not necessarily placed in line or a specific cross-section as shown in the figure, the screws 11 can be placed offset relative to each other as the first piece 3 is normally an extruded piece.

[0068] The second piece 4 comprises a first surface or wall 9 which first surface or wall 9 is parallel to a corresponding surface 10 or wall of the bend or crease of a wall panel 1 comprising a corresponding opening 8 when the wall panel 1 is mounted. The first surface or wall 9 may exercise a pressure on the corresponding surface 10 of the wall panel 1 and / or lock the part of the wall panel comprising the corresponding surface or wall in a secure position.

[0069] The second piece 4 according to the third embodiment has a cross-section comprising two legs of different length and a connecting part securing the two legs to each other, the connecting part is positioned closest to the base part 5. The second piece 4 is normally extruded and may e.g. be made of aluminium or similar extrudable material. The first surface or wall 9 of the second piece 4 both prevents two neighbouring wall panels 1 from leaving the locked position in which position the protrusion 7 of the fastening parts 6 are inserted into the corresponding part 8 of the wall panels 1, as well as the surface or wall 9 defines a gap between the two neighbouring wall panels 1 which gap allows thermal expansion of the wall panels 1.

[0070] The first piece 3 and the second piece 4 of the third embodiment comprises corresponding click parts 13 at two positions 13A and 13B. At a first position 13A the first piece 3 comprises a protruding part in form of a longitudinally extending linear protrusion, at the second position 13B the first piece 3 comprises a longitudinally extending groove, and at each position this part constitutes a first part of a click part 13. Alternatively, the first part of the click part 13 may comprise a part with an opposite expression in respect of being protruding or depressed. Alternatively, the corresponding click parts may be constituted of protrusions or depressions not constituting a linear part but comprising through-going openings or depressions in a different form than a linear form e.g. round or oval openings or depressions.

[0071] Together the click parts 13 at positions 13A and 13B guide and lock the second piece 4 relative to the first piece 3 in both a horizontal and in a vertical direction.

[0072] Each second piece 4 of the third embodiments is after mounting placed on top of the base part 5 of the first piece 3 on top of the wing 16, and the base part 5 is consequently placed between the second piece 4 and the mounting surface 2.

[0073] Each second piece 4 of the third embodiment comprises a supporting part 17 connecting and locking the fastening part 6 of the second piece 4 to the wing 6 extending from the base part 5 of the first piece 3. According to the shown embodiment, the supporting part 17 comprises two surfaces which are connected above the outermost position of the wing 16 at a right angle. The supporting part 17 may alternatively comprise a single surface, either straight or curved, extending between the fastening part 6 of the second piece 4, or it may comprise two surfaces connected above the wing 16 at a different angle i.e. an angle ≠ 90 degrees.

[0074] The third embodiment of the fastener shown in fig. 3 may be used for mounting a wall panel according to the following method: 1 st< step: A first piece 3 of fastener is mounted on wall 2 by using fastening means 11. The fastening means 11 are mounted through or at the wing 16 of the first piece 3 constituting a part of the base part 5. After having fastened the first piece 3 by a single fastening means 11, the first piece 3 of the fastener can be adjusted. After adjustment, the remaining fastening means 11 is mounted through or at the wing of the first piece. The first piece 3 of the fastener can be mounted either mirrored as shown in fig. 3, or with the single wing 16 in same direction for neighbouring first pieces 3. 2 nd< step: When all the first pieces 3 of the fastener is secured to the mounting surface 2, the second piece 4 of the fastener may be clicked into position and locked on to the first piece 3 of the fastener as the first 3 and second piece 4 comprises corresponding click parts 13, the click parts at positions 13A and 13B are able to hold the second piece 4 of fastener in place. 3 rd< step: When the second piece 4 of the fastener is mounted, the first surface or wall 9 of second piece 4 creates a space or a guide for a pre-processed wall panel 1 where the edges of a pre-processed wall panel 1 is folded e.g. to provide a cassette. The wall panel 1 is then mounted to the fastener by positioning a bend edge of the wall panel 1 into the slot or gap created between the fastening part 6 of the first piece 3 of the fastener and the first surface or wall 9 of second piece 4, the opening or protrusion 7 of the first piece 3 of fastener and the corresponding part 8 of wall panel 1 will lock the wall panel 1 into a final position.

[0075] Fig. 4 shows a fourth embodiment of a fastener according to the invention, the fourth embodiment comprises one fastener shown in a state where the fastener is secured to the mounting surface 2, and in which state the fastener alone may secure a wall panel 1 to the mounting surface 2.

[0076] The fastener of the fourth embodiment comprises two pieces: a first piece 3 and a second piece 4, both the first piece 3 and the second piece 4 are advantageously prepared by extrusion i.e. each piece 3, 4 constitutes a long unit with a constant profile / cross-section which may extend in the complete length of one or more mounted wall panels 1.

[0077] The first piece 3 is of an overall U-shape and comprises a base part 5 being in contact with the wall 2 when the fastener is mounted on the wall 2 and comprises two fastening parts 6 extending from positions at opposite first and second end of the base part 5.

[0078] The fastening part 6 extends from the base part 5 in a 90 degrees angle and comprises a protrusion 7, after mounting of a wall panel 1 the protrusion 7 interacts with a corresponding opening 8 of the wall panel 1. The fastening part 6 may extend from the base part 5 in a different angle such as an angle between or equal to 45 and 135 degrees. The corresponding opening 8 in the wall panel 1 may be a groove made by milling. Alternatively, the fastening part 6 may comprise an opening 7 interacting with a corresponding protruding part of the wall panel 1.

[0079] The first piece 3 is fastened to the wall 2 by not shown fastening means 11. The fastening means 11 may comprise screws 11, glue or any other suitable means.

[0080] The second piece 4 is also of an overall U-shape and comprises a connecting part connecting two fastening parts 6 extending from positions at opposite first and second end of the connecting part. The second piece 4 also comprises a first surface or wall 9 which first surface or wall 9 is parallel to a corresponding surface 10 or wall of the bend or crease of a wall panel 1 comprising a corresponding opening 8 when the wall panel 1 is mounted. The first surface or wall 9 may exercise a pressure on the corresponding surface 10 of the wall panel 1 and / or lock the part of the wall panel 1 comprising the corresponding surface or wall in a secure position.

[0081] The first piece 3 and the second piece 4 of the third embodiment comprises corresponding click parts 13 at two similar positions which positions mirror each other. At each position the first piece 3 comprises a longitudinally extending groove, and at each position the second part 4 comprises a longitudinally extending protrusion. Alternatively, the first piece 3 and the second piece may comprise a corresponding click parts with an opposite expression in respect of being protruding or depressed. Alternatively, the corresponding click parts may be constituted of protrusions or depressions not constituting a linear part but comprising a plurality of through-going openings or depressions in a different form than a linear form e.g. round or oval openings or depressions.

[0082] The second piece 4 of the fourth embodiments is after mounting placed on top of the base part 5 of the first piece 3, and the base part 5 is consequently placed between the second piece 4 and the mounting surface 2.

[0083] The second piece 4 of the fourth embodiment does not need a separate supporting part as the embodiment of fig. 3 as the connecting part between the two fastening parts 6 provide the necessary support.

[0084] The fourth embodiment of the fastener shown in fig. 4 may be used for mounting a wall panel according to the following method: 1 st< step: First, the first piece 3 of the fastener is mounted to mounting surface 2 using non-shown fastening means 11. The fastening means 11 may be inserted through the base part 5 of first piece 3 extending between the two fastening parts 6. After having mounted a few fastening means 11 through the first piece 3 of fastener, the first piece 3 may be adjusted, and then the remaining fastening means 11 may be mounted through the base part 5 of first piece 3 thereby securing the first piece 3 to the mounting surface 2. 2 nd< step: When the first piece 3 of the fastener is mounted, the second piece 4 of the fastener is clicked on to the first piece 3 of fastener 3, corresponding click parts 13 of respectively the first 3 and second piece 4 makes it possible to attach and lock the second piece 4 to the first piece 3 and thereby hold the second piece 4 of the fastener in place. When the second piece 4 of the fastener is attached to the first piece 3, the first surface or wall 9 of the second piece 4 creates a space or a guide for the bend edge of the wall panel 1. 3 rd< step: Then a bend edge of a pre-processed wall panel 1, which wall panel 1 is pre-processed by providing the wall panel 1 with a folded edge, preferably at all four sides so they provide a cassette, is placed into the slot created between the first piece 3 of fastener and the first surface or wall 9 of second piece 4. The wall panel 1 is locked into the position as the protrusion of the first piece of fastener 7 fits into the corresponding opening 8 of the wall panel 1 preventing the edge of the wall panel 1 from moving out of the slot.

[0085] Fig. 5A and 5B shows a fifth embodiment of a fastener according to the invention. Fig. 5A shows a system comprising both wall panels 1 and a fastener comprising a first piece 3 and a second piece 4 whereas fig. 5B shows the first piece 3 of the fastener alone. In fig. 5A, the fifth embodiment is shown in a state where the fastener has been secured to a mounting surface 2 and two neighbouring wall panels 1 are secured to the mounting surface 2 by the fastener.

[0086] The fastener of the fifth embodiment like the previous embodiment comprises two pieces: a first piece 3 being in contact with and being fastened to the mounting surface 2, and a second piece 4 at least being fastened to the first piece 3 of the fastener. Both the first and the second piece 3, 4 may be extruded and each piece 3, 4 constitutes a longitudinally extending unit with a constant profile / cross-section which normally extends in the complete length of one or more mounted wall panels 1.

[0087] The first piece 3 comprises a base part 5 comprising a top surface and a lower surface where the top surface faces away from the mounting surface 2 after mounting, and the lower surface is in contact with the mounting surface 2 after mounting of the first piece 3. The base part 5 comprises fastening parts 6 adapted to fasten wall panels to the fastener and secondary fastening parts 15A extending from the top surface of the base part 5 adapted to fasten or lock the second piece 4 to the first piece 3. In the shown embodiment both the fastening parts 6 and the secondary fastening parts 15 extend in a 90 degrees angle, however, the fastening parts may deviate from this angle if the corresponding parts of the second piece 4 is adapted to this deviation. In general, the fastening part 6 may extend from the base part 5 in an angle between or equal to 45 and 135 degrees.

[0088] The two upright fastening parts 6 are positioned at opposite edges of the base part 5. The fastening parts 6 may be flexibly fixed to the base part 5 which means that the angle between the base part 5 and each upright fastening part 6 may deviate slightly from a relaxed position when the fastening part 6 is pushed away from the centre of the first piece 3, and then the fastening part 6 may elastically return to a relaxed position when pushing stops.

[0089] The fastening parts 6 each comprises a protrusion 7 which after mounting of a wall panel 1 interacts with a corresponding opening 8 of a wall panel 1. The corresponding opening 8 in the wall panel 1 may be a groove made by milling. Alternatively, the outer fastening part 6 may comprise an opening 7 interacting with a corresponding protruding part of the wall panel 1.

[0090] The first piece 3 is fastened to the mounting surface 2 by fastening means 11 comprising a single central screw. Alternatively, the base part 5 of the first piece 3 may comprise one or two wings 16 extending respectively to the left and / or to the right of the fastening parts 6 and adapted to be in close contact with the mounting surface 2 after mounting. Then a screw 11 may be inserted through each of the wings 16.

[0091] The first piece 3 further comprises two secondary fastening parts 15A extending from the top surface of the base part 5. Normally, the secondary fastening parts 15A extend in an angle of around 90 degrees relative to the lower surface of the base part 5.

[0092] Each of the secondary fastening parts 15A comprises click parts 13 corresponding to click parts of the second piece 4. The first piece 3 and the second piece 4 of the fifth embodiment therefore comprises corresponding click parts 13 at two positions 13A and 13B. Each corresponding click part 13 of the first piece 3 comprises protruding parts at a first position 13A and a second position 13B. The first position 13A for the corresponding click part 13 is facing towards the centre of the first piece 3 and the second position 13B for the corresponding click part 13 is facing opposite i.e. away from the centre of the first piece 3.

[0093] Like the previous embodiments, the second piece 4 comprises a first surface or wall 9 which first surface or wall 9 is parallel or approximately parallel to a corresponding surface 10 or wall of the bend or crease of a wall panel 1 comprising a corresponding opening 8 when the wall panel 1 is mounted. The first surface or wall 9 may exercise a pressure on the corresponding surface 10 of the wall panel 1 when mounted and thereby lock the part of the wall panel comprising the corresponding surface or wall in a secure position.

[0094] The second piece 4 of the fifth embodiment comprises secondary fastening parts 15B locking the second piece 4 to the first piece 3 after mounting. The secondary fastening parts 15B of the second piece 4 comprises four protruding arms, two inner arms and two outer arms. Each of the arms 15B comprises corresponding click parts 13 corresponding to click parts 13 of the first piece 3, and when the second piece 4 is pushed into positions in a direction towards the first piece 3 between the bended ends of the wall panels 1, then the corresponding click means 13 of respectively the first piece 3 and the second piece 4 will interlock and secure the second piece 4 in a final position. Normally, either the secondary fastening parts 15A of the first piece 3 or the inner arms 15B and / or outer arms 15B of the second piece 4 are flexibly fixed to the base part 5 of the first piece 3 or to the body of the second piece 4 in order to make it possible for the second piece 4 to slide into place.

[0095] When the secondary fastening parts 15A of the first piece 3 comprises more than one click part 13 - or contact points for click parts - e.g. two click parts 13 e.g. on opposite side of a secondary fastening part 15A, then a stronger hold is obtained which may be an advantage if the second piece 4 extends beyond the outer surface of the wall panels 1 as in the embodiments shown in fig. 5A and 6A.

[0096] According to the fifth embodiment, the second piece 4 comprises a body extending beyond the outer surface or cover surface of the wall panels 1, i.e. the body protrudes from the surface constituted by the wall panels 1. This is sometimes preferred by architects both for ornamental and for practical purposes.

[0097] 1 st< step: First, the first piece 3 of the fastener is mounted to mounting surface 2 using shown fastening means 11. The fastening means 11 may be inserted through the base part 5 of first piece 3 extending between the two fastening parts 6. After having mounted a few fastening means 11 through the first piece 3 of fastener, the first piece 3 may be adjusted, and then the remaining fastening means 11 may be mounted through the base part 5 of first piece 3 thereby securing the first piece 3 to the mounting surface 2.

[0098] 2 nd< step: After the first piece 3 of the fastener is mounted, the two wall panels 1 are clicked into position relative to the first piece 3, so opening or protrusion 7 of first piece 3 of fastener is fixed to corresponding part of wall panel 8.

[0099] 3 rd< step: When the two wall panels 1 have been mounted, the second piece 4 of the fastener is attached to the first piece 3 by pushing the second piece 4 towards the first piece 3 until the secondary fastening parts 15B of the second part 4 clicks into contact with the secondary fastening parts 15A of the first piece 3 and lock the second piece 4 to the first piece 3.

[0100] Fig. 6A and 6B shows a sixth embodiment of a fastener according to the invention. Fig. 6A shows a system comprising both wall panels 1 and a fastener comprising a first piece 3 and a second piece 4 whereas fig. 6B shows the first piece 3 of the fastener alone. In fig. 6A, the sixth embodiment is shown in a state where the fastener has been secured to a mounting surface 2 and two neighbouring wall panels 1 are secured to the mounting surface 2 by the fastener.

[0101] The fastener of the sixth embodiment comprises the same features as the previous embodiments and same reference numbers are used for similar features. In particular the sixth embodiment resembles the fifth embodiment, and therefore only the features which differs from the fifth embodiment is specified in the following.

[0102] Like the fifth embodiment, the first piece 3 comprises to secondary fastening parts 15A extending from the top surface of the base part 5.

[0103] Each of the secondary fastening parts 15A comprises click parts 13 corresponding to click parts of secondary fastening parts 15B of the second piece 4. However, each of the secondary fastening parts 15A of the first piece 3 only comprises corresponding click parts 13 at one positions 13B. At this position, each secondary fastening part 15A comprises a corresponding click part 13 facing away from the centre of the first piece 3.

[0104] The second piece 4 of the sixth embodiment only comprises two secondary fastening parts 15B in form of arms 15B extending towards the first piece 3 in a mounted position and fixing the second piece 4 to the first piece 3 after mounting. The two arms 15B comprises corresponding click parts 13 corresponding to click parts 13B of the first piece 3, and when the second piece 4 is pushed into positions in a direction towards the first piece 3 between the bended ends of the wall panels 1, the corresponding click means 13 of respectively the first piece 3 and the second piece 4 will interlock and lock the second piece 4 into a final position. Normally, either the secondary fastening parts 15A of the first piece 3 or the secondary fastening parts 15B in form of the arms 15B of the second piece 4 are flexibly mounted to the base part 5 of the first piece 3 or to the body of the second piece 4 in order to make it possible for the second piece 4 to slide into place.

[0105] 1 st< step: First, the first piece 3 of the fastener is mounted to mounting surface 2 using shown fastening means 11. The fastening means 11 may be inserted through the base part 5 of first piece 3 extending between the two fastening parts 6. After having mounted a few fastening means 11 through the first piece 3 of fastener, the first piece 3 may be adjusted, and then the remaining fastening means 11 may be mounted through the base part 5 of first piece 3 thereby securing the first piece 3 to the mounting surface 2.

[0106] 2 nd< step: After the first piece 3 of the fastener is mounted, the two wall panel 1 is clicked on to the first piece 3, so opening or protrusion 7 of first piece 3 and the corresponding opening or protrusion 8 of the wall panel 1 fits and locks. The wall panels 1 is here in solid material and the protrusion 8 providing the locking function occurs by folding of the material.

[0107] 3 nd< step: After the two wall panels 1 have been mounted, the second piece 4 of the fastener is pushed into position and the secondary fastening parts 15B of the second piece 4 is clicked into contact with the secondary fastening parts 15A of the first piece 3 and then the second piece 4 is locked to the first piece 3.

[0108] Fig. 7 shows a seventh embodiment of a fastener according to the invention. Fig. 7 shows a system comprising two wall panels 1 and a fastener comprising a first piece 3 and a second piece 4 where the fastener has been secured to a mounting surface 2 and two neighbouring wall panels 1 are secured to the mounting surface 2 by the fastener.

[0109] The fastener of the seventh embodiment comprises the same features as the previous embodiments and same reference numbers are used for same or similar features. The seventh embodiment resembles the fifth and sixth embodiment, and therefore only the features which differs from these embodiments are specified in the following.

[0110] Like the fifth embodiment, the first piece 3 of the seventh embodiment comprises two secondary fastening parts 15A, however, the secondary fastening parts 15A of the seventh embodiment do not extend from the top surface of the base part 5 instead the two secondary fastening parts 15A extend downward from an inner surface of the fastening parts 6. Normally, the secondary fastening parts 15A are flexibly mounted or attached to the fastening parts 6 allowing a gripping part of the secondary fastening parts 15A to move back and forth between a relaxed position and a biased position.

[0111] Normally, the first piece 3 is fastened to the mounting surface 2 by not-shown fastening means 11 e.g. in form of screws inserted through one or two wings 16 extending respectively to the left and / or to the right of the fastening parts 6 and which wings 16 are adapted to be in close contact with the mounting surface or wall 2 after mounting.

[0112] Each of the secondary fastening parts 15A comprises corresponding click parts 13 corresponding to click parts of the second piece 4.

[0113] According to this embodiment, the second piece 4 comprises a body comprising a first surface 9 or wall configured to be parallel to a corresponding surface 10 or wall of the bend or crease of a wall panel 1 when the wall panel 1 is in a mounted position, which first surface 9 or wall is configured to be in contact with and / or to exercise a pressure on the corresponding surface 10 of the wall panel 1 after mounting. The body further comprises a secondary fastening part 15B which after mounting extends in direction of the top surface of the first piece 3.

[0114] According to the seventh embodiment, the click parts 13 of the first piece 3 are shaped as inward rounded or concave surfaces of the downward extending secondary fastening parts 15A, and the click parts 13 of the second piece 4 is shaped as outward rounded or convex rounded surfaces. The outward rounded surfaces of the second piece 4 are positioned at opposite surfaces of a central body, however, the outward rounded surfaces of the second piece 4 may also be positioned at two separate bodies or arms 15B.

[0115] 1 st< step: First, the first piece 3 of the fastener is mounted to mounting surface 2 using shown fastening means 11. The fastening means 11 may be inserted through the base part 5 of first piece 3 extending between the two fastening parts 6. After having mounted a few fastening means 11 through the first piece 3 of fastener, the first piece 3 may be adjusted, and then the remaining fastening means 11 may be mounted through the base part 5 of first piece 3 thereby securing the first piece 3 to the mounting surface 2.

[0116] 2 nd< step: After the first piece 3 has been mounted, the two wall panels 1 are clicked into position relative to the first piece 3, so opening or protrusion 7 of first piece 3 of fastener fits into corresponding opening or protrusion 8 wall panel 1.

[0117] 3 nd< step: After the two wall panels 1 have been mounted, the second piece 4 is pushed into position and attached to first piece 3 as the secondary fastening parts 15B clicked in to correct position with the secondary fastening parts 15A of the first piece 3 locking the second piece 4 to the first piece 3.

[0118] The fifth, sixth and seventh embodiments of first piece 3 both comprises a panel support part 20. When the wall panel 1 is pushed into position, the panel support part 20 prevents the wall panel 1 from being inserted too deep. Such a panel stop part 20 may be added to any of the embodiments where it may be considered useful which is generally in embodiments where the wall panel 1 is not positioned in contact with the top surface of the base part 5. Ref. no .Ref. name 1Wall panel2Wall or mounting surface3First piece of fastener attached to the mounting surface4Second piece of fastener attached to first piece of fastener5Base part of first piece6Fastening part fastening wall panels to fastener7Opening or protrusion of first piece of fastener8Corresponding part of wall panel9First surface or wall of second piece10Corresponding surface of wall panel11Fastening means fastening first or second piece 3 to mountinq surface 212Filling material13Corresponding click parts of first and second piece13A, 13BPositions for corresponding click parts14Opening or protrusion of second piece of fastener15A, 15BSecondary fastening parts fastening second piece to first piece16Wings of first or second piece constituting a part of the base part17Supporting part of second piece18Connecting central part19Alignment part20Panel support part

Claims

1. Fastener for a wall panel (1) comprising a bend or crease along a mounting edge to be mounted on a mounting surface (2), which fastener comprises - a first piece (3) comprising - - a base part (5) which base part (5) comprises a top surface and a lower surface, the top surface faces away from the mounting surface (2) after mounting and the lower surface is in contact with the mounting surface (2) after mounting, and - - a fastening part (6) extending from the top surface of the base part (5) and comprising either an opening or a protrusion (7) configured to interact with a corresponding part (8) of a wall panel (1), and - a second piece (4) comprising a first surface (9) or wall configured to be parallel to a corresponding surface (10) or wall of the bend or crease of a wall panel (1) when the wall panel (1) is in a mounted position, and the first surface (9) or wall is configured to be in contact with and / or to exercise a pressure on the corresponding surface (10) of the wall panel (1) after mounting, characterized in that the first piece (3) and the second piece (4) comprises interconnecting secondary fastening parts (15A, 15B) comprising corresponding click parts (13), the corresponding click parts (13) are configured to fix or secure the position of the second piece (4) relative to the first piece (3).

2. A fastener according to claim 1, wherein the click parts (13) comprise - a first part comprising a track or a plurality of depressions and - a corresponding second part comprising a protruding part or a plurality of protrusions and which corresponding click parts (13) guide and / or lock the first piece (3) and the second piece (4) relative to each other.

3. A fastener according to claim 1, wherein the interconnecting secondary fastening parts (15A, 15B) comprises flexibly mounted corresponding parts extending either from the first piece (3) or from the second piece (4), or from both the first piece (3) and the second piece (4).

4. A fastener according to any previous claim, wherein at least a part of the fastening part (6) extends from the top surface of the base part (5) in a direction perpendicularly to lower surface of the base part (5).

5. A fastener according to any preceding claim, wherein at least one or both or all fastening part(s) (6) is / are flexibly mounted to the base part (5) of the first piece (3).

6. A fastener according to any preceding claim, wherein at least one of the interconnecting secondary fastening parts (15A, 15B) of the second piece (4) is flexibly mounted to a body or a connecting part of the second piece (4).

7. A fastener according to any preceding claim, wherein the second piece (4) of the fastener comprises a body having a U-shaped comprising a connecting part or a rectangular profile cross-section.

8. A fastener according to claim 7, wherein the body having a U-shaped or rectangular profile cross-section, comprises at least two arms or parts extending in the direction of the base part (5) after mounting, and the corresponding click parts (13) of the second piece (4) are positioned on or at the at least two arms or parts.

9. A fastener according to claim 7, wherein the corresponding click parts (13) of the second piece (4) are positioned on or at the body having a U-shaped comprising a connecting part or a rectangular profile cross-section.

10. A fastener according to any preceding claim, wherein the corresponding click parts (13) of respectively the first piece (3) and the second piece (4) in a mounted state comprises corresponding contact surfaces angled perpendicular to the direction of movement or shaped with corresponding concave and convex surfaces.

11. A fastener according to any preceding claim, wherein the first piece (3) and / or the second piece (4) is made of extruded material such as an aluminium alloy or of another material such as a polymer e.g. an elastomer polymer and has a constant cross-sectional profile through-out its length.

12. A fastener according to any previous claim, wherein the fastening part (6) extending from the base part (5) comprises a protrusion (7) interacting with a corresponding opening (8) of a wall panel (1) and the protrusion may have a triangular or convex profile.

13. A fastener according to claim 14, wherein the profile of the protrusion (7) of the fastening part (6, 14) is a right triangle or right-angled triangle where one side constituting a leg or the base of the triangle faces the top surface of the base part (5) after mounting and the second side constituting the second leg or the height of the triangle faces the fastening part (6).

14. A fastener according to any preceding claim, wherein the second piece (14) is locked to the first piece (3) and is not fastened to the mounting surface (2) by fastening means (11).

15. A system comprising a wall panel (1) and a fastener according to one of the claims 1-13, wherein the first piece (3) of the fastener is secured to a mounting surface (2), a wall panel (1) is positioned relative to the first piece (3) and the second piece (4) is secured to the first piece (3) and preventing removal of the wall panel (1).

Images