Building panel set

Abstract

The invention relates to a building panel, such as a floor or wall panel. The panels comprise first mechanical locking systems located respectively at parallel and opposite third and fourth edges (13, 14), such as long edges, configured to cooperate to lock two adjacent building panels (10, 20) horizontally and vertically, preferably by folding movement. The panel further comprises second locking systems located at first and second parallel and opposite edges (11, 12), for example short edges, respectively, which are configured to cooperate to lock two adjacent building panels (10, 30) horizontally and vertically. One of the third or fourth edges (13, 14), preferably an upper edge portion of the third edge (13), comprises a first lower lip (139) configured to cooperate with a first upper lip (149) of an upper edge portion of the other of the third and fourth edges of an adjacent panel (20) when the third and fourth edges are arranged in locking engagement.

Description

[0001] This application is a divisional application of the invention patent application with the application date of January 9, 2020, the application number of 202080066182.6, and the invention name of "Building Panel Group". Technical Field

[0002] The present disclosure generally relates to the field of building panels. Background Art

[0003] Laminated floors typically include a core made of 6 - 12 mm fiberboard, an upper decorative surface layer made of laminated material with a thickness of 0.2 - 0.8 mm, and a lower balancing layer made of laminated material, plastic, paper, or similar material with a thickness of 0.1 - 0.6 mm. The laminated surface includes melamine - impregnated paper. The most common core material is fiberboard, which has a high density and good stability and is commonly referred to as HDF - high - density fiberboard. Sometimes, MDF - medium - density fiberboard - is also used as the core.

[0004] This type of laminated floor panel is mechanically joined / connected together by a so - called mechanical locking system. These systems include locking devices that lock the panels horizontally and vertically. The mechanical locking system is usually formed by processing the core of the panel. Optionally, the components of the locking system can be formed from a separate material such as aluminum or high - density fiberboard, which is formed integrally with the floor panel, i.e., joined together with it during the manufacture of the floor panel.

[0005] The main advantage of a floating floor / floating screed floor with a mechanical locking system is easy installation. They can also be easily picked up again and reused in different positions. However, known systems have disadvantages, for example, in terms of humidity control. Therefore, there is room for improvement in this technical field. Summary of the Invention

[0006] The general object of the present invention is to provide a building panel that helps to improve the control of humidity (such as water). The improved humidity control can include, but is not limited to, improved sealing between assembled building panels, improved surface water - permeation tolerance (resistance to water permeating through the surface), and the surface includes assembled building panels.

[0007] A further object is to provide a building panel that helps to align such assembled building panels.

[0008] Therefore, a further object of the present invention is to provide a building panel that helps to improve the humidity control of laid building panels such as floating floors. Specifically, the object of the present invention is to provide a building panel for improving humidity control and / or at least reducing the possibility of water permeating through the T - joints of such a floor laying layer.

[0009] The above objects of the embodiments of the present invention can be fully or partially achieved by the locking system and the floor panel according to the present disclosure. The embodiments of the present invention are clear from the description and the drawings.

[0010] Definitions of some terms

[0011] Hereinafter, the visible surface of the installed floor panel is referred to as the "front surface", and the opposite side of the floor panel facing the subfloor is referred to as the "back surface". A "horizontal plane" means a plane parallel to the front side. The directly adjacent upper parts of two adjacent joint edges of two joined floor panels together define a "vertical plane" perpendicular to the horizontal plane. The outer part of the floor panel located between the front and back surfaces at the edge of the floor panel is called the "joint edge". Usually, the joint edge has several "joint surfaces", which can be vertical, horizontal, angled, rounded, chamfered, etc. These joint surfaces are present on different materials, such as laminate, fiberboard, wood, plastic, metal (especially aluminum) or sealing material.

[0012] "Vertical locking" means locking parallel to the vertical plane. "Horizontal locking" means locking parallel to the horizontal plane.

[0013] "Upward" means towards the front surface, "downward" means towards the back surface, "inward" means generally horizontally towards the inner and central part of the panel, and "outward" means generally horizontally away from the central part of the panel.

[0014] "Locking" or "locking system" refers to mating / collaborating connecting devices that vertically and / or horizontally interconnect the floor panels. A "mechanical locking system" means locking without using glue / adhesive. In many cases, a mechanical locking system can also be combined with an adhesive.

[0015] A "decorative surface layer" refers to a surface layer mainly used to give the floor a decorative appearance. A "wear-resistant surface layer" relates to a surface layer containing a large amount of abrasives, which is mainly suitable for improving the durability of the front side. It can be concluded that a "decorative wear-resistant surface layer" is a layer designed to give the floor a decorative appearance and improve the durability of the front side. The surface layer is usually applied to the core.

[0016] Embodiments of the present invention are particularly applicable to floating floors formed by floor panels that are mechanically joined together by a locking system integrally formed with the floor panels, i.e., configured at the factory. The floating floor consists of one or more upper layers made of solid wood or wood veneer, decorative laminates, powder-based surfaces, or decorative plastic materials, a core made of wood fiber-based materials or plastic materials, and preferably a lower balancing layer on the back side of the core. Floor panels made of solid wood or floor panels having a surface layer made of cork, linoleum, rubber, or a soft wear layer, such as a needle-punched felt glued to the board, a printed and preferably also painted surface, as well as floors having a hard surface such as stone, tiles, and similar materials are also included.

[0017] Thus, by way of non-limiting example, the following description of the prior art, the problems of known systems, and the objects and features of embodiments of the present invention will first be directed to this field of application, in particular to panels formed as rectangular floor panels having long edges and short edges, intended to be mechanically joined to one another on the long edges and short edges.

[0018] The long edges and short edges are mainly used to simplify the description of embodiments of the present invention. The panels can be square. It should be emphasized that embodiments of the present invention can be used for any floor panel and can be combined with all types of known locking systems formed on the long edges and / or short edges, where the floor panels are designed to be joined using a mechanical locking system on at least two adjacent edges, and the mechanical locking system connects the panels in the horizontal and / or vertical directions.

[0019] In one aspect of the present invention, a set of similar or substantially identical building panels is provided, such as floor panels or wall panels. The panels include a first mechanical locking system located correspondingly at parallel and opposite third and fourth edges, which are the long edges of the panel. The first mechanical locking system includes a locking groove at the third edge, which is configured to receive a first locking tongue of the fourth edge of an adjacent panel by a folding displacement of the adjacent panel / adjacent panels, for vertical locking between two adjacent building panels. A second locking system is located correspondingly at parallel and opposite first and second edges, such as the short edges of the panel. The second locking system is configured to cooperate to horizontally and vertically lock two adjacent building panels, preferably by a vertical movement, such as vertical folding. When the third and fourth edges are assembled in the locked position, the upper edge portion of one of the third or fourth edges (preferably the third edge) includes a first lower lip portion, which is configured to cooperate with the upper edge portion of the other of the third and fourth edges of the adjacent panel. The first upper lip portion of the fourth edge is configured to form a tight fit around the first lower lip portion when the first lower lip portion is received below the first upper lip portion in response to the folding displacement. Further advantages and embodiments are set forth in the appended dependent claims and detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present disclosure will be described in conjunction with exemplary embodiments and will be described in more detail with reference to the accompanying schematic drawings, in which:

[0021] Figure 1 A schematic view of a floor including a locking system according to the prior art is shown.

[0022] Figure 2 Shows Figure 1 A schematic view of the floor in the locked position and an adjacent building panel.

[0023] Figure 3 Shows the assembly of another floor to the Figure 2 floor by a vertical movement (vertical folding).

[0024] Figures 4A - 4B A schematic cross-sectional view of a locking system according to the prior art is shown.

[0025] Figures 5A - 5C A schematic view of a locking system according to an embodiment of the present invention is shown.

[0026] Figure 6 Shows a schematic cross-sectional view of the first locking system according to an embodiment of the present disclosure at Figure 5A section A-A.

[0027] Figure 7 Shows a schematic cross-sectional view of a second locking system according to an embodiment of the present disclosure at Figure 5C section B-B.

[0028] Figure 8 is a schematic cross-sectional view of a first locking system according to an embodiment assembled into a wall panel at Figure 12 section C-C.

[0029] Figure 9 is a schematic cross-sectional view of a first locking system according to an embodiment assembled into a wall panel at Figure 12 section D-D.

[0030] Figure 10 Shows a schematic view of the assembly of a second locking system by vertical movement according to an embodiment.

[0031] Figure 11 Shows a further schematic view of the second locking system assembled by vertical movement Figure 10 thereof.

[0032] Figure 12 is a schematic view of an exemplary embodiment assembled into a wall panel.

[0033] Figure 13 is a schematic view of an exemplary embodiment assembled into a floor.

[0034] Figure 14A is a perspective view of a panel according to an embodiment.

[0035] Figure 14B is Figure 14A a detailed view of an embodiment thereof.

[0036] Figure 14C is Figure 14A a cross-sectional view of an embodiment thereof. DETAILED DESCRIPTION

[0037] Embodiments of the present disclosure will now be described with reference to the accompanying drawings. It should be emphasized that the use of combinations of embodiments can achieve improved or different functions.

[0038] All embodiments can be used alone or in combination. Spacing, angles, dimensions, arches / rounded portions, etc. between surfaces are merely exemplary and can be adjusted within the basic principles of the present invention.

[0039] Figure 1 Shows a known building panel including a mechanical locking system.

[0040] A mechanical locking system typically includes a tongue and tongue groove for vertical locking and a locking element and locking groove for horizontal locking. It usually has at least four pairs of effective / working mating locking surfaces, two pairs for vertical locking and two pairs for horizontal locking. The locking system includes several additional surfaces that generally do not contact each other and can thus be manufactured with much larger tolerances than the mating locking surfaces.

[0041] A laminated floor typically consists of a core, which is made of 6 - 9 mm fiberboard, a 0.20 mm thick upper surface layer, and a lower balancing layer. The surface layer provides the appearance and durability of the floor panel. When the relative humidity (RH) varies during the year, the core provides stability and the balancing layer keeps the panel level.

[0042] Figure 4A A typical first mechanical locking system (strip locking) according to the prior art is shown, which can be locked by angling (see Figure 3 ), and is widely used on the market, especially for assembling the respective long edges of the panels with each other. Figure 4A A vertical cross - section of a floor panel is shown, showing a part of the long side edge 13’ of the floor panel 20’ and a part of the long side 14’ of the floor panel 10’. The bodies of the floor panels 10’, 20’ can be made of a fiberboard body or core, which supports a wear - resistant and decorative surface layer on its front side and a balancing layer on its back side (lower side). The locking system has a tongue 14h’ and a tongue groove 13j’, which locks the panels in the vertical direction V by means of an upper tongue surface 53 and a lower tongue surface 56 that cooperate with an upper tongue - groove surface 43 and a lower tongue - groove surface 46. The locking strip 13a’ is formed by the body and supports a locking element 13b’. Thus, the locking strip 13a’ and the locking element 13b’ to some extent constitute an extension of the lower part of the tongue groove 13j’. The locking element 13b’ formed on the strip 13a’ has an operable locking - element surface 13m’, which cooperates with an operable locking - groove surface 14m’ in the locking groove 14g’ in the opposite locking - groove side of the floor panel 10’. If the panels are pulled apart, horizontal locking of the floor panels 10’, 20’ transverse to the joint edge is obtained due to the engagement between the horizontal operating locking surfaces 13m’, 14m’.

[0043] As Figure 4B shown, the known second locking system can also be formed with a flexible tongue 11i’ (fold - locking) typically used at the short edges 11’, 12’ as Figure 4B shown, which can be displaced during the locking process. Such a locking system can utilize as Figure 3locked by the vertical movement shown, wherein the first edge 11' of the panel 10' is assembled to the second edge 12' of the panel 30' by vertical movement.

[0044] The displaceable tongue 11i' is configured to cooperate with the second tongue groove 12j' to lock in the vertical direction. The displaceable tongue 11i' is a separate component, made of, for example, plastic, and is inserted into the displacement groove 11k' at the first edge 11' of the first panel 10'. During the vertical assembly of the first and second edges of the first and second panels, the tongue 11i' is pushed into the displacement groove 11k'. When the panel reaches the locking position, the displaceable tongue 11i' snaps back and enters the second tongue groove 12j' at the second edge 12' of the panel 30'.

[0045] The third edge 13' and the fourth edge 14' of the corresponding panel are provided with a first locking system that can be assembled to the adjacent panel 20' by angular adjustment movement to obtain the simultaneous assembly of the first edge 11' and the second edge 12' and the third edge 13' and the fourth edge 14', as Figure 3 shown.

[0046] Figures 4A - 4B A cross-section showing different embodiments of known locking systems during the assembly of the first panel 10' and the second panel 20' is shown.

[0047] Exemplary embodiments of the present invention are shown in Figures 5A - 5C and Figures 6 - 11 as shown.

[0048] Referring to Figures 5A - 5C 、 Figure 6 and Figure 7 , Figure 6 The first mechanical locking system shown is formed with a tongue 14h and a groove 13j and is configured to be assembled by angular adjustment movement. The fourth edge 14 may include a first locking projection 14e in the shape of a locking tongue, which is provided with a first lower edge surface 14f. An embodiment of the second locking system is shown in Figure 7 wherein the second edge 12 is provided with a second locking projection 12e that may be a locking tongue 12h, which is provided with a second lower edge surface 12f. Preferably, the first lower edge surface 12f and the second lower edge surface 14f are configured to cooperate with the first upper surface 11c and the second upper surface 13c of the first locking bar 13a and the second locking bar 11a of the adjacent panel - such as Figure 6 the second panel 20 shown in Figure 7 and

[0049] The first mechanical locking system may include a first tongue groove 13j located at one of the third edge 13 or the fourth edge 14 (e.g., the third edge 13), and a first locking tongue 14h located at the other of the third edge or the fourth edge (e.g., the fourth edge 14). The first locking tongue 14h and the first tongue groove 13j are configured to cooperate to lock the third edge 13 and the fourth edge 14 in the vertical direction V. The first mechanical locking system may typically further include a first locking bar 13a at the third edge 13 - which is provided with a vertically protruding first locking element 13b, and a first locking groove 14g at the fourth edge 14. The first locking element 13b is configured to cooperate with the first locking groove 14g to lock the third edge 13 and the fourth edge 14 in the horizontal direction - particularly in a direction away from each other and perpendicular to the third edge and the fourth edge.

[0050] The second mechanical locking system is preferably formed at one edge, such as the first edge, of the first short edge 11 or the second short edge 12 of similar (preferably substantially identical) panels 10, 20, 30, 40, 50. The second mechanical locking system may be configured to lock the first edge 11 of the first panel 10 to the second edge of the adjacent panel 30 in a plane and in the vertical and / or horizontal directions, the vertical and / or horizontal directions being perpendicular to the first edge and the second edge and towards and away from each other. An embodiment of the second mechanical locking system enables the assembly of the first panel and the second panel by the vertical movement of the second edge of the adjacent panel 30 relative to the first edge 11 of the first panel 10. Such vertical movement is shown, for example, in Figure 10 and Figure 11 The first mechanical locking system and the second mechanical locking system are preferably formed by mechanically cutting (e.g., milling, drilling, and / or sawing) the edges of the panels, and the second mechanical locking system may be provided with a displaceable tongue 11i preferably made of plastic. The displaceable tongue may be bendable and provided with a protruding bendable portion, such as the displaceable tongue disclosed in WO2006 / 043893 and WO2007 / 015669. The displaceable tongue may also be configured to be locked by movement along the first edge and the second edge, such as the displaceable tongue disclosed in WO2009 / 116926 and WO2008 / 004960.

[0051] Referring to Figure 7An embodiment of the second locking system may include a second locking tongue, which may be configured in the shape of a displaceable tongue 11i disposed in a displacement groove 11k, for example, at a first edge 11 of a first panel 10. The displaceable tongue 11i is configured to cooperate with a first tongue groove 12j formed at the other of the first edge 11 or the second edge 12 to lock the first edge 11 and the second edge 12 in the vertical direction V.

[0052] Another embodiment of the second locking system is shown in Figure 10 and Figure 11 which has a shape that can be integrated with the first locking system in the form of a single piece.

[0053] It can be derived from Figure 6 that an upper edge portion of one of the third edge 13 and the fourth edge 14, which may be opposite parallel edges (e.g., the third edge 13), may include a flat surface portion that may be in the shape of a first lower lip 139 configured to cooperate (including but not limited to receiving or mating) with a complementary flat surface portion of an upper edge portion of the other of the third edge or the fourth edge of an adjacent panel, which may be in the shape of a first upper lip 149.

[0054] It can be derived from Figure 7 that an upper edge portion of one of the first edge 11 or the second edge 12 (e.g., the first edge 11) may be opposite parallel edges and may include a flat surface portion that may be in the shape of a second lower lip 119 configured to cooperate (including but not limited to receiving or mating) with a complementary flat surface portion of an upper edge portion of the other of the first edge or the second edge of an adjacent panel, which may be in the shape of a second upper lip 129.

[0055] As Figure 6 shown, the outermost portion of the first upper lip 149 may be disposed inboard of the outermost portion of the first locking tongue 14h.

[0056] As Figure 6 shown, the outermost portion of the first lower lip 139 may be disposed inboard of the outermost portion of the first locking bar 13a.

[0057] As Figure 6 shown, the outermost portion of the first lower lip 139 may be disposed outboard of the innermost portion of the first tongue groove 13j.

[0058] The upper edge portion of the fourth edge 14, preferably the long edge, may include a vertically extending edge portion extending from the front face 15, followed by an inward bend, preferably a right-angled bend. After this bend is a horizontal flat surface, where the first upper lip portion 149 may include said horizontal flat surface. The vertically extending edge portion and the first upper lip portion may be perpendicular to each other, and the corner connecting these two portions may be rounded or chamfered. Optionally, the horizontal flat surface may additionally form a reference plane. The reference plane may be the surface that contacts an adjacent panel in the locked position and serves as the base plane or guiding plane for aligning the panels with each other.

[0059] The upper edge portion of the third edge 13, preferably the long edge, may include a vertically extending edge portion extending from the front face, followed by an outward bend, preferably a right-angled bend. After this bend is a horizontal flat surface, where the first lower lip portion 139 may include said horizontal flat surface. The vertically extending edge portion and the first lower lip portion may be perpendicular to each other, and the corner connecting these two portions may be rounded. Optionally, the horizontal flat surface may additionally form a reference plane.

[0060] The upper edge portion of the second edge 12, preferably the short edge, may include a vertically extending edge portion extending from the front face 15, followed by an inward bend, preferably a right-angled bend. After this bend is a horizontal flat surface, where the second upper lip portion 129 may include said horizontal flat surface. The vertically extending edge portion and the second upper lip portion may be perpendicular to each other, and the corner connecting these two portions may be rounded or chamfered. Optionally, the horizontal flat surface may additionally form a reference plane.

[0061] The upper edge portion of the first edge 11, preferably the short edge, may include a vertically extending edge portion extending from the front face 15, followed by an outward bend, preferably a right-angled bend. After this bend is a horizontal flat surface, where the second lower lip portion 119 may include said horizontal flat surface. The vertically extending edge portion and the second lower lip portion may be perpendicular to each other, and the corner connecting these two portions may be rounded. Optionally, the horizontal flat surface may additionally form a reference plane.

[0062] As Figure 7 shown, the outermost portion of the second lower lip portion 119 may be disposed inside the outermost portion of the second locking bar 11a.

[0063] As Figure 11 shown, the second lower lip portion 119 may have an extension inside the innermost portion of the second tongue groove 11j.

[0064] As Figure 11 shown, the second upper lip portion 129 may have an extension outside the outermost portion of the second locking tongue 12h.

[0065] As Figure 7 shown, the outermost part of the second lower lip portion 119 can be disposed inside the outermost part of the second locking tongue 11i.

[0066] As Figure 7 shown, the outermost part of the second lower lip portion 119 can be at least partially disposed inside the opening of the second displacement groove 11k.

[0067] "Inside" is synonymous with "inward", that is, along the direction towards the center of the panel. "Outside" can be synonymous with "outward", that is, along the direction away from the center of the panel.

[0068] The upper lip portion and the lower lip portion can each include a reference surface configured to align the front face 15 of the panel with the corresponding front face 15 of an adjacent panel to be flush with each other when assembled in the locked position.

[0069] The upper lip portion and the lower lip portion can be planar. In particular, the lip portions can be planar and can extend in parallel. The lip portions can preferably extend in a plane parallel to the front face 15 of the panel. However, other configurations are also conceivable, such as being inclined with respect to the front face 15.

[0070] The first upper lip portion 149 of the panel can be configured to support and / or rest on the first lower lip portion 139 when adjacent panels are assembled in a locking engagement. Thus, when the panel is assembled with one or more further panels in the locked position by the first locking system, it helps to improve the sealing function.

[0071] The second upper lip portion 129 of the panel can be configured to support and / or rest on the second lower lip portion 119 when adjacent panels are assembled in a locking engagement. Thus, when the panel is assembled with one or more further panels in the locked position by the second locking system, it helps to improve the sealing function.

[0072] The first lower lip portion 119 and the second lower lip portion 139 can form a continuous right angle with each other. The first upper lip portion 129 and the second upper lip portion 149 can form a continuous right-angled shape with each other. The continuous right angle can extend around the corresponding diagonal of the panel. The first and second lower lip portions and upper lip portions can form a continuous rectangular shape. As Figure 5A shown, the rectangle can extend along the perimeter of the panel.

[0073] The first lower lip portion 119 and the second lower lip portion 139 can be configured to be located below when engaged with the corresponding upper lip portions 129, 149. The first upper lip portion 129 and the second upper lip portion 149 can be configured to overlap when engaged with the corresponding lower lip portions 119, 139.

[0074] Accordingly, at least a portion of the lower lip portions 119, 139 can face upward, and at least a portion of the upper lip portions 129, 149 can face downward.

[0075] The first edge 11 and the third edge 13 can each include a vertically extending surface extending from the front face 15 of the panel. The lower lip portions 119, 139 can be combined with the corresponding vertically extending surfaces to form an inwardly recessed shape, such as an inwardly recessed right-angled surface.

[0076] The second edge 12 and the fourth edge 14 can each include a vertically extending surface extending from the front face 15 of the panel. The upper lip portions 129, 149 can be combined with the corresponding vertically extending surfaces to form an outwardly convex shape, such as a right-angled surface complementary to the corresponding inwardly recessed lower lip portion, as Figures 6 - 11 shown.

[0077] The corresponding upper lip portion and / or lower lip portion can include materials that contribute to sealing, including but not limited to polymers, rubbers, silicones, adhesives, waxes (vax), etc.

[0078] In a preferred embodiment, the corresponding first lower lip portion 119 and second lower lip portion 139 are provided on the short first edge 11 and the long third edge 13 of the panel 10, and the corresponding first upper lip portion 129 and second upper lip portion 149 are respectively provided on the short second edge 12 and the long fourth edge 14, such as Figure 6 , Figure 7 , Figure 10 and Figure 11 shown.

[0079] Accordingly, since the corresponding first upper lip portion 129 and second upper lip portion 149 can cooperate with the corresponding first lower lip portion 119 and second lower lip portion 139, including bearing against them, this configuration can provide a technical advantage that the weight of the panel presses the corresponding first upper lip portion 129 and second upper lip portion 149 against the corresponding first lower lip portion 119 and second lower lip portion 139, so that the weight of the panel can contribute to the sealing function and thus can contribute to improved sealing.

[0080] This means that in some embodiments, when two adjacent panels are assembled in the locked position, the first lower edge surfaces 14f and the first upper surfaces 13c of the two adjacent panels may not be contiguous / adjacent to each other in some embodiments. Accordingly, when assembled in the locked position, a gap may extend between at least a portion of the first lower edge surfaces 14f and the first upper surfaces 13c of the two adjacent panels.

[0081] However, in some embodiments, when two adjacent panels are assembled in the locked position by the first locking system, the first lower edge surfaces 14f and the first upper surfaces 13c of the two adjacent panels can be adjacent to each other.

[0082] Refer to Figure 6 , the first locking tongue 14h, the first tongue groove 13j, and the first lips 139, 149 can be configured to bias the first upper lip 149 towards the first lower lip 139 when the corresponding third edge 13 and fourth edge 14 are assembled in the locked position. When one or more panels are assembled in the locked position, this configuration can facilitate the first upper lip 149 always being biased towards the first lower lip 139.

[0083] The first locking system can include the first locking tongue 14h and the first tongue groove 13j. The first lower lip 139 is preferably disposed between the first tongue groove 13j and the front face 15 of the panel. The first upper lip 149 is preferably disposed between the first locking tongue 14h and the front face 15 of the panel.

[0084] Refer to Figure 7 , one of the first edge 11 or the second edge 12 - for example, the first edge 11 - in some embodiments can include a displaceable, preferably flexible, tongue 11i that is configured to be able to assemble the panel by vertical folding. The displaceable tongue 11i can be configured to cooperate with the second tongue groove 12j to bias the second upper lip 129 against the second lower lip 119, thereby helping to improve the sealing function.

[0085] The second locking system can include the second locking tongues 11i, 12h and the second tongue grooves 12j, 11j.

[0086] The second lower lip 119 is preferably disposed between the second tongue grooves 12j, 11j and the front face 15 of the panel.

[0087] The second upper lip 129 is preferably disposed between the second locking tongues 11i, 12h and the front face 15 of the panel.

[0088] For example, from Figures 6 - 11 it can be seen that providing a pair of lips, such as the first lower lip 139 and the first upper lip 149 and / or the second lower lip 119 and the second upper lip 129, each pair 119, 129; 139, 149 can respectively form a mechanical labyrinth seal. Therefore, this configuration is particularly beneficial for preventing moisture from penetrating between the edges 11, 12 and / or between the edges 13, 14, for example, from the front face 15 to the locking tongues 11i, 12h or the locking tongue 14h or the tongue grooves 11j, 12j, 13j, or from the front face 15 to the back face 16.

[0089] Refer to Figure 8 and Figure 12, an exemplary embodiment is shown, in which the panel is assembled into a wall panel, that is, the panel is used as a wall panel panel. Providing lips 119, 129, 139, 149 between the locking tongues 11i, 12h, 14h and / or the locking grooves 11j, 12j, 13j and the front face 15 can facilitate one or more pairs of lips, that is, 119, 129; 139, 149 can provide a mechanical barrier for fluids such as water. Thus, when acted upon by gravity, a fluid such as water flowing vertically downward along the front face 15 can be prevented from flowing past the lips, such as the first lower lip 139, in the direction from the front face 15 to the back face 16.

[0090] In particular, the first lower lip 139 can provide, for example, a mechanical obstruction portion for a fluid such as water that extends in a direction opposite to the direction of gravity. Thus, when acted upon by gravity, a fluid such as water flowing vertically downward along the front face 15 will be prevented from flowing upward over the first lower lip 139.

[0091] The first lower lip 139 and the first upper lip 149 can mutually define a reference plane Dp, as Figure 10 shown.

[0092] The second lower lip 119 and the second upper lip 129 can mutually define a reference plane Dp, as Figure 11 shown.

[0093] The first lip 119, the second lip 129, the third lip 139 and the fourth lip 149 can be configured to define the reference plane Dp.

[0094] The first lip 119, the second lip 129, the third lip 139 and the fourth lip 149 can extend substantially in a common plane, and this common plane can be the reference plane Dp.

[0095] When assembled in the locked position, the reference plane Dp can assist in the alignment of the corresponding front faces 15 of adjacent panels, such that the corresponding front faces 15 of adjacent panels are arranged flush with each other.

[0096] The first lower lip 139 can preferably be provided between the first tongue groove 13j and the front face 15 of the panel. The first upper lip 149 can preferably be provided between the first locking tongue 14h and the front face 15 of the panel.

[0097] As described above and as Figure 7 shown, according to an embodiment, one of the first edge or the second edge can include a second locking tongue 11i - for example, a displaceable locking tongue configured to linearly translate in a displacement groove 11k, and the other of the first edge and the second edge includes a second locking tongue groove 12j for receiving the second locking tongue.

[0098] The second lower lip portion 119 can preferably be disposed between the second locking tongue 11i and the front face 15 of the panel in a vertical V position. The second upper lip portion 129 can preferably be disposed between the second tongue groove 12j and the front face 15 of the panel in a vertical V position.

[0099] Optionally, as Figure 10 and Figure 11 shown, the second lower lip portion 119 can be disposed between the second tongue groove 11j of the first edge 11 and the front face 15 of the panel in a vertical V position. The second upper lip portion 129 can be disposed between the second tongue 12h of the second edge 12 and the front face 15 of the panel in a vertical V position.

[0100] The first lower lip portion 139 can be contiguous with the second lower lip portion 119.

[0101] The first upper lip portion 149 can be contiguous with, preferably contiguous to, the second upper lip portion 129.

[0102] The lip portions 119, 129, 139, 149 can be connected to each other so as to continuously extend along the first edge, the second edge, the third edge and the fourth edge.

[0103] Since the lip portions 119, 129, 139, 149 overlap and are located below in a complementary manner respectively, when the panel is assembled with a similar panel in the locked position along all the edges 11, 12, 13, 14, they can continuously define a reference plane Dp along the first edge, the second edge, the third edge and the fourth edge. Therefore, improved sealing can be promoted.

[0104] The function of the lip portions can thus be dual; having the following functions: aligning the respective front faces of the panels and / or providing a continuous seal together with the respective mating lip portions of adjacent panels along the perimeter of the panel when assembled in the locked position on all four edges of the panel.

[0105] The lip portions can be formed adjacent to each other so as to continuously define a reference plane Dp along the perimeter of the panel. Thus, it is achieved that when the panel is assembled with a further substantially similar panel in the locked position along all four edges, the mating lip portions or closing lip portions 119, 129; 139, 149 that extend substantially along the entire panel or the entire perimeter of the panel provide continuous contact. Therefore, continuous sealing along the perimeter of the panel can be promoted.

[0106] Referring to Figure 7 , preferably, the edges of the panel including the locking bars, i.e., the first edge 11 and the third edge 13, can include respective lower lip portions.

[0107] For example, referring to Figures 6 - 7 andFigures 10 - 11 , preferably, the edges of the panel including the locking bars, i.e., the first edge 11 and the third edge 13, may include respective lower lips.

[0108] The panel 10 may include a surface layer 15a provided on the front face 15, and preferably includes a backing layer 16a provided on the back face 16. Typically, the surface layer includes a decorative layer that is configured to be visible when the panel is assembled to the floor. Such decorative layers are well known in the art and may be provided in different forms, including but not limited to printed paper, powder, printed powder, or veneer, such as wood veneer. The surface layer may also provide a protective layer, typically including an adhesive resin, such as a thermosetting resin, which facilitates adhesion, i.e., adhesion between the decorative layer and the core of the panel. The adhesive may also promote the incorporation of one or more additives such as surface hardening particles and / or pigments in order to provide various properties to the surface layer. The adhesive may include, for example, melamine formaldehyde. During the manufacturing process of the panel, the adhesive may penetrate into the core of the panel. Typically, the adhesive is provided in powder form, whereby it becomes liquid when heated. Thus, the adhesive may penetrate into the core of the building panel. The core may include, for example, one of MDF, HDF, wood, stone, ceramic, PVC, plastic, and other materials may also be considered.

[0109] The adhesive may penetrate from the front face 15 of the panel into the core of the panel in the thickness direction Z and enter the core. This feature provides an improved seal between the respective upper and lower lips.

[0110] The penetration depth may enter at least the first lower lip 139 and the first upper lip 149. This provides a more waterproof first locking system.

[0111] The penetration depth may enter at least the second lower lip 119 and the second upper lip 129. This provides a more waterproof second locking system.

[0112] Thus, aspects of the present disclosure may be particularly suitable for wet spaces, such as bathrooms, kitchens, etc.

[0113] Thus, aspects of the present disclosure may be suitable for use as floor panels, such as as Figures 6 - 7 , Figures 10 - 11 and Figure 13 shown.

[0114] Thus, aspects of the present disclosure may be suitable for use as wall panels, such as as Figures 8 - 9 and Figure 12 shown.

[0115] It should be understood that, as described herein, the arrangement and construction of the upper lips 129, 149 and the lower lips 119, 139, particularly configured to continuously follow all the edges of the panel, are not limited to use in combination with a specific locking system, but can be implemented in combination with virtually any mechanical locking system and for building panels of any material. The above locking system is only an exemplary embodiment of possible implementations.

[0116] Referring Figures 12 - 13 , the panel, for example, the first panel 10, can be assembled to an adjacent second panel 20 along its long fourth edge 14 by a first locking system, for example, by an angular adjustment movement, thereby forming a long side-to-long side joint. The panel 10 can also be assembled to an adjacent third panel 30 by a second locking system, for example, by vertically folding one of its short edges 11, thereby forming a short side-to-short side joint, and can also be assembled to another fourth panel 40 by the first locking system, for example, by an angular adjustment movement along its long third edge 13, thereby forming another long side-to-long side joint. The other two panels 20, 40 are arranged on opposite sides of the short side joint. When assembling, for example, a floating floor as shown in Figure 13 or a wall panel as shown in Figure 12 , the final configuration of the panels is typically a panel laying. It can be concluded that this configuration includes two T-shaped joints. Each T-shaped joint includes a long side-to-long side joint (between the third edge 13 and the fourth edge 14) and a short side-to-short side joint (between the first edge 11 and the second edge 12). Therefore, a set of similar or substantially identical panels can be assembled in a locked position to include a first T-shaped joint T1 and a second T-shaped joint T2, for example, as shown in Figure 13 .

[0117] To improve the sealing between the assembled panel laying, for example, a panel laying (see Figure 13 ) - which includes panels assembled in a locked position on all four sides, i.e., all four edges - it is necessary to improve the waterproofness of the two T-shaped joints.

[0118] Due to the building panel having the features set forth herein and in the appended claims, it is possible to promote an improvement in the sealing of the T-shaped joints T1 and T2.

[0119] Figure 6 A preferred embodiment is also shown, in which the first locking tongue 14h and the first upper lip 149 can be configured to form a tight fit around the first lower lip 139 when the first lower lip 139 is received under the first upper lip 149 in response to the folding displacement of the first panel 10 about its third edge 13.

[0120] The first locking tongue 14h of the fourth edge 14 of the first panel 10 is configured to be received in the tongue groove 13j of the third edge 13 of an adjacent panel 20 in response to the folding displacement of the first panel about its third edge 13.

[0121] The first locking tongue 14h and the first upper lip 149 of the fourth edge 14 may be configured to form a tight fit around the first lower lip 139 when the first lower lip 139 is received below the first upper lip 149 in response to the folding displacement.

[0122] The fourth edge may include a third tongue groove 14n formed between the first upper lip 149 and the first locking tongue 14h. The third tongue groove 14n may open in a direction parallel to the front face 15 of the panel. The third tongue groove 14n may be configured to receive a third locking tongue 13m of the third edge of an adjacent panel in response to the folding displacement of the first panel 10. The third locking tongue 13m may be formed between the first tongue groove 13j and the first upper lip 139.

[0123] The third tongue groove 14n may be configured to receive the third locking tongue 13m in response to or by means of an angular adjustment or pivotal displacement of the first panel 10 about its fourth edge 14, for example an angular adjustment or pivotal displacement about an axis extending parallel to the longitudinal axis L of the panel.

[0124] The first lower lip 139 and the first upper lip 149 may be arranged adjacent and parallel to each other in response to or by means of an angular adjustment or pivotal displacement of the first panel 10 about its fourth edge 14, for example an angular adjustment or pivotal displacement about an axis extending parallel to the longitudinal axis L of the panel.

[0125] A first dimension d1 extends vertically between the upper surface of the tongue groove 13j and the first lower lip 139 (preferably its flat surface).

[0126] A second dimension d2 extends vertically between the upper surface of the first locking tongue 14h and the first upper lip 149.

[0127] When the third locking tongue 13m is received in the third locking tongue groove 14n, the dimensions of the first dimension d1 and the second dimension d2 may be set to provide an interference fit.

[0128] The second dimension d2 may be 0 to 0.15 mm smaller than the first dimension d1, for example 0.01 to 0.15 mm smaller, preferably 0.01 to 0.07 mm smaller, and more preferably 0.02 to 0.05 mm smaller.

[0129] The first dimension d1 and the second dimension d2 can be configured to form a tight fit around the first lower lip portion 139 when the first lower lip portion 139 is received under the first upper lip portion 149 in response to the folding displacement. For example, the first dimension d1 and the second dimension d2 can be the same dimension. For example, the second dimension d2 can be configured to have a negative tolerance relative to the first dimension d1. For example, the first dimension d1 can be slightly larger than the second dimension d2, such as 0.1% - 10% larger, such as 0.1% - 3% larger.

[0130] The size of the dimensions can take into account any after-treatment, such as wax, which can be applied to the first lower lip portion 139 and / or the first upper lip portion.

[0131] The first locking tongue 14h and / or the first upper lip portion 149 can bend in response to receiving the third locking tongue 13m. For example, the outermost portion of the first upper lip portion 149 can move 0.1 mm to 0.15 mm relative to its relaxed position. For example, the outermost portion of the first locking tongue 14h can move 0.1 mm to 0.15 mm relative to its relaxed position

[0132] Thus, when the corresponding third edge 13 and fourth edge 14 are assembled in the locked position, the first upper lip portion 149 can be biased towards the first lower lip portion 139. That is, there may be pressure exerted by the first upper lip portion 149 and the first locking tongue 14h on the third locking tongue 13m.

[0133] In one embodiment, the first edge 11 and the second edge 12 include the first locking system as described herein with respect to the third edge 13 and the fourth edge 14, and thus it should be understood that the first edge 11 can include a corresponding third locking tongue 11m and the second edge can include a corresponding third tongue groove 12n. Figures 14A - 14C Such an embodiment is shown. Thus, in Figures 14A - 14C the embodiment, the second dimension D2' can be 0.01 mm to 0.15 mm smaller than the first dimension D1', preferably 0.01 mm to 0.07 mm smaller, more preferably 0.02 mm to 0.05 mm smaller.

[0134] Item

[0135] Item 1. A building panel set composed of similar or substantially identical building panels, such as floor panels or wall panels, comprising:

[0136] A first mechanical locking system located respectively at parallel and opposite third edge 13 and fourth edge 14, where the third edge 13 and the fourth edge 14 are the long edges of the panel. The first mechanical locking system includes a locking groove 13j at the third edge 13, and the locking groove 13j is configured to receive a first locking tongue 14h of the fourth edge of an adjacent panel by means of a folding displacement of the adjacent panel 20, so as to preferably achieve horizontal locking and vertical locking between two adjacent building panels 10, 20 by means of a folding movement, and

[0137] A second mechanical locking system located respectively at parallel and opposite first edge 11 and second edge 12, such as the short edges of the panel, which is configured to cooperate to preferably horizontally lock and vertically lock two adjacent building panels 10, 30 by means of a vertical movement, such as vertical folding. One of the third edge 13 or the fourth edge 14, preferably the upper edge portion of the third edge 13, includes a first lower lip 139, and the first lower lip 139 is configured to cooperate with the upper edge portion of the other edge of the third edge and the fourth edge of the adjacent panel 20 when the third edge and the fourth edge are assembled in the locking position. The first upper lip 149 of the fourth edge 14 is configured to form a tight fit around the first lower lip 139 when the first lower lip 139 is received below the first upper lip 149 in response to the folding displacement.

[0138] Item 2. The building panel group according to Item 1, wherein the fourth edge includes a third tongue groove 14n formed between the first upper lip 149 and the first locking tongue 14h, and the third tongue groove 14n is configured to receive a third locking tongue 13m of the third edge 13 of an adjacent panel in response to the folding displacement of the first panel 10, wherein the third locking tongue 13m is formed between the first tongue groove 13j and the first upper lip 139.

[0139] Item 3. The building panel group according to any one of the preceding items, wherein the third tongue groove 14n is configured to receive the third locking tongue 13m by means of a folding displacement of the adjacent panel around its fourth edge 14.

[0140] Item 4. The building panel group according to any one of the preceding items, wherein a first dimension d1 extends vertically between the upper surface of the first tongue groove 13j and the first lower lip 139, preferably the flat surface of the first lower lip 139, and a second dimension d2 extends vertically between the upper surface of the first locking tongue 14h and the first upper lip 149.

[0141] Item 5. The building panel group according to Item 4, wherein the second dimension d2 is smaller than the first dimension d1 by 0.01 mm to 0.15 mm, preferably by 0.01 mm to 0.07 mm, and more preferably by 0.02 mm to 0.05 mm.

[0142] Item 6. The building panel group according to Item 4 or 5, wherein the sizes of the first dimension d1 and the second dimension d2 are designed to provide an interference fit when the third locking tongue 13m is received in the third locking tongue groove 14n.

[0143] Item 7. The building panel group according to any one of the preceding Items 4 to 6, wherein the first dimension d1 and the second dimension d2 are configured to form a tight fit around the first lower lip portion 139 when the first lower lip portion 139 is received under the first upper lip portion 149 in response to the folding displacement.

[0144] Item 8. The building panel group according to any one of the preceding Items 4 to 7, wherein the second dimension d2 is configured to have a negative tolerance relative to the first dimension d1.

[0145] Item 9. The building panel group according to any one of the preceding Items 4 to 8, wherein the second dimension d2 is configured to be smaller in size relative to the first dimension d1.

[0146] Item 10. The building panel group according to any one of the preceding Items 4 to 9, wherein the first locking tongue (14h) and / or the first upper lip portion 149 are configured to flex in response to receiving the third locking tongue 13m.

[0147] Item 11. The building panel group according to any one of the preceding Items, wherein the second mechanical locking system is substantially the same as the first mechanical locking system.

[0148] Item 12. The building panel group according to any one of the preceding Items, wherein the upper edge portion of one of the first edge 11 or the second edge 12 includes a second lower lip portion 119, and the second lower lip portion 119 is configured to cooperate with the second upper lip portion 129 of the upper edge portion of the other of the first edge and the second edge of the adjacent panel 30 when the first edge and the second edge are preferably assembled in the locked position by the vertical displacement of the second edge 12 of the adjacent panel 30 relative to the first edge 11.

[0149] Item 13. The building panel set according to the preceding item, wherein the second mechanical locking system includes a second locking groove 11j at the first edge 11, and the second locking groove 11j is configured to receive a second locking tongue 12h of the second edge of an adjacent panel through the folding displacement of the adjacent panel for vertical locking between the first edge 11 and the second edge 12 of adjacent building panels 10, 30. The second locking tongue 12h and the second upper lip 129 of the second edge 12 are configured such that when the second lower lip 119 is received below the second upper lip 129 in response to the folding displacement of the adjacent panel 30 around its second edge 12, a tight fit is formed around the second lower lip 119.

[0150] Item 14. The building panel set according to item 13, wherein a first dimension d1' extends vertically between the upper surface of the second tongue groove 11j and the first lower lip 119, preferably its flat surface, and a second dimension d2' extends vertically between the upper surface of the second locking tongue 12h and the second upper lip 129.

[0151] Item 15. The building panel set according to item 14, wherein the second dimension d2' is smaller than the first dimension d1' by 0.01 mm to 0.15 mm, preferably by 0.01 mm to 0.07 mm, and more preferably by 0.02 mm to 0.05 mm.

[0152] Item 16. The building panel set according to item 14 or 15, wherein the first dimension d1' and the second dimension d2' are sized to provide an interference fit when the second lower lip 119 is received below the second upper lip 129 in response to the folding displacement.

[0153] Item 17. The building panel set according to any one of the preceding items 14 to 16, wherein the second dimension d2' is configured to be dimensionally insufficient relative to the first dimension d1'.

[0154] Item 18. The building panel set according to any one of the preceding items 14 to 17, wherein the second locking tongue 12h and / or the second upper lip 129 are configured to flex in response to receiving the second lower lip 119.

[0155] Item 19. The building panel set according to any one of the preceding items, wherein the tight fit is obtained before and / or after panel processing, and the processing is, for example, applying a sealant to one or more of the lower lips 119, 139 and / or one or more of the upper lips 129, 149.

[0156] Item 20. The building panel set according to any one of the preceding items, wherein the lips 119, 129, 139, 149 each include a flat horizontal surface.

[0157] Item 21. The building panel set according to any one of the preceding items, wherein the first lower lip portion 139 is continuous with the second lower lip portion 119, and preferably the first upper lip portion 149 is continuous with the second upper lip portion 129.

[0158] Item 22. The building panel set according to any one of the preceding items, wherein when the panel is assembled with similar panels in the locked position along all the edges 11, 12, 13, 14, the lips 119, 129, 139, 149 preferably define a reference plane Dp continuously along the first edge, the second edge, the third edge and the fourth edge.

[0159] Item 23. The building panel set according to any one of the preceding items, wherein the lips 119, 129, 139, 149 are connected to each other so as to extend continuously along the first edge, the second edge, the third edge and the fourth edge.

[0160] Item 24. The building panel set according to any one of the preceding items, wherein when adjacent panels are assembled in the locked position by the first locking system, the first upper lip portion 149 is configured to rest on the first lower lip portion 139.

[0161] Item 25. The building panel set according to any one of the preceding items, wherein when adjacent panels are assembled in the locked position by the second locking system, the second upper lip portion 129 is configured to rest on the second lower lip portion 119.

[0162] Item 26. The building panel set according to any one of the preceding items, wherein the first locking system and the second locking system each include locking tongues 11i, 12h, 14h and tongue grooves 11j, 12j, 13j, wherein the lips 119, 129, 139, 149 are provided between the corresponding one of the locking tongues or tongue grooves and the front face 15 of the panel.

[0163] Item 27. The building panel set according to any one of the preceding items, wherein the upper edge portion of the second edge 12 and / or the fourth edge 14 includes a vertically extending edge portion extending from the front face 15, followed by an inwardly curved portion towards the center of the panel, and preferably, a horizontal flat surface follows the curved portion.

[0164] Item 28. The building panel set according to any one of the preceding items, wherein the upper edge portion of the first edge 11 and / or the third edge 13 includes a vertically extending edge portion extending from the front face 15, followed by an outwardly curved portion away from the center of the panel, and preferably, a horizontal flat surface follows the curved portion.

[0165] Item 29. The building panel set according to any one of the preceding items, wherein the bent portion includes a right-angled bent portion.

[0166] Item 30. The building panel set according to any one of the preceding items, wherein the first lower lip portion 139 is continuous with the second lower lip portion 119.

[0167] Item 31. The building panel set according to any one of the preceding items, wherein the first upper lip portion 149 is continuous with the second upper lip portion 129.

[0168] Item 32. The building panel set according to any one of the preceding items, wherein the second lower lip portion 119 is connected to the first upper lip portion 149.

[0169] Item 33. The building panel set according to any one of the preceding items, wherein the second upper lip portion 129 is connected to the first lower lip portion 139.

[0170] Item 34. The building panel set according to any one of the preceding items, wherein the first upper and lower lip portions and the second upper and lower lip portions 119, 129, 139, 149 define a reference plane Dp for aligning the front face 15 of the building panel with the front face (15) of an adjacent building panel.

[0171] Item 35. The building panel set according to any one of the preceding items, wherein one of the first edge or the second edge includes a second locking tongue 11i, such as a displaceable locking tongue configured to linearly translate in a displacement groove 11k, and the other of the first edge and the second edge includes a second tongue groove 12j for receiving the second locking tongue, wherein the lip portions 119, 129, 139, 149 are provided between the first tongue groove and the front face 15 of the panel.

[0172] Item 36. The building panel set according to any one of the preceding items, wherein the lip portions 119, 129, 139, 149 are connected to each other, and preferably, when the panel is assembled with similar panels in a locked position along all edges 11, 12, 13, 14, the lip portions continuously extend and / or continuously define the reference plane Dp along the first edge, the second edge, the third edge, and the fourth edge.

[0173] Item 37. The building panel set according to any one of the preceding items, wherein the first lip portion, the second lip portion, the third lip portion, and the fourth lip portion extend substantially in a common plane.

[0174] Item 38. The building panel set according to any one of the preceding items, wherein the panel includes a surface layer 15a, and the surface layer includes an adhesive, such as a thermosetting resin.

[0175] Item 39. The building panel set according to the building panel sets described in the foregoing items, wherein the adhesive 18 has a penetration depth into the core 17 of the panel in a direction transverse to the front face 15.

[0176] Item 40. The building panel set according to the building panel sets described in the foregoing items, wherein the penetration depth extends to and includes at least a portion of the lip.

[0177] Item 41. The building panel set according to any one of the foregoing items 38 to 40, wherein the surface layer 15a is a protective surface layer and / or a decorative surface layer.

[0178] Item 42. The building panel set according to any one of the foregoing items 38 to 41, wherein the surface layer 15a includes one or more of veneer, pigment, and cellulose fiber.

[0179] Item 43. The building panel set according to any one of the foregoing items 38 to 42, wherein the adhesive includes a thermosetting material such as melamine formaldehyde.

[0180] Item 44. The building panel set according to any one of the foregoing items 38 to 43, wherein the core 17 includes one or more of MDF, HDF, wood, stone, ceramic, PVC, and plastic.

Claims

1. A set of building panels, comprising at least three panels, each of the building panels comprising a first edge (11) and a second edge (12) which are parallel and opposite to each other, and a third edge (13) and a fourth edge (14) which are parallel and opposite to each other, wherein the third edge (13) and the fourth edge (14) are opposite to each other in a direction perpendicular to the direction in which the first edge (11) and the second edge (12) are opposite to each other, wherein each of the building panels include: a first mechanical locking system at a third edge (13) of a first panel of the at least three panels and at a fourth edge (14) of a second panel of the at least three panels, the first mechanical locking system comprising a first locking groove (13j) at the third edge (13), the first locking groove being configured to receive a first locking tongue (14h) of the fourth edge of the second panel by folding displacement of the first panel and the second panel so as to achieve horizontal locking and vertical locking between the first panel (10) and the second panel (20), and a second mechanical locking system located at a first edge (11) of the first panel (10) or the second panel (20) and a second edge (13) of a third panel (30) of the at least three panels, the second mechanical locking system being configured to cooperate to horizontally lock the first panel (10) or the second panel (20) and vertically lock the adjacent third panel (30) by vertical movement, wherein the upper edge portion of the third edge (13) of the first panel comprises a first lower lip (139) configured to cooperate with a first upper lip (149) of the upper edge portion of the fourth edge of the second panel when the third edge of the first panel and the fourth edge of the second panel are assembled in a locked position, wherein the first upper lip (149) of the fourth edge (14) is configured to form a tight fit against the first lower lip (139) when the first lower lip (139) is received below the first upper lip (149) in response to the folding displacement, wherein the first dimension (d1) extends in the vertical direction between the upper surface of the first locking groove (13j) and the first lower lip (139), and the second dimension (d2) extends in the vertical direction between the upper surface of the first locking tongue (14h) and the first upper lip (149), The second dimension (d2) is 0.01 to 0.15 mm smaller than the first dimension (d1).

2. The building panel set according to claim 1, in, The fourth edge (14) includes a third tenon groove (14n) formed between the first upper lip (149) and the first locking tenon (14h), the third tenon groove (14n) being configured to receive a third locking tenon (13m) of the third edge (13) of the first panel in response to the folding displacement of the second panel (20), wherein the third locking tenon (13m) is formed between the first locking groove (13j) and the first lower lip (139).

3. The building panel set according to claim 2, in, The third tongue groove (14n) is configured to receive the third locking tongue (13m) of the first panel by folding displacement of the second panel.

4. The building panel set according to claim 1, in, The second dimension (d2) is 0.01 to 0.07 mm smaller than the first dimension (d1) or 0.02 to 0.05 mm smaller than the first dimension (d1).

5. The building panel set according to claim 2, in, The first dimension (d1) and the second dimension (d2) are sized to provide an interference fit when the third locking tongue (13m) is received in the third tongue groove (14n).

6. The building panel set according to claim 1, in, The first dimension (d1) and the second dimension (d2) are configured to form a tight fit against the first lower lip (139) when the first lower lip (139) is received under the first upper lip (149) in response to the folding displacement.

7. The building panel set according to claim 1, in, The second dimension (d2) is configured to have a negative tolerance relative to the first dimension (d1).

8. The building panel set according to claim 1, in, The second dimension (d2) is configured to be smaller than the first dimension (d1).

9. The building panel set according to claim 2, in, The first locking tongue (14h) and / or the first upper lip (149) are configured to flex in response to receiving the third locking tongue (13m).

10. The set of building panels according to any one of the preceding claims, in, The upper edge portion of one of the first edge (11) of the first panel or the second panel or the second edge (12) of the third panel includes a second lower lip (119), and the second lower lip is configured to cooperate with a second upper lip (129) of the upper edge portion of the other of the first edge (11) of the first panel or the second panel or the second edge (12) of the third panel when the first and second edges are assembled in a locked position by vertical displacement of the second edge (12) of the third panel (30) relative to the first edge (11) of the first panel or the second panel.

11. The building panel set according to claim 10, in, The second mechanical locking system includes a second locking groove (11j) at the first edge (11) of the first panel or the second panel, and the second locking groove (11j) is configured to receive a second locking tongue (12h) of the second edge (12) of the third panel by folding displacement of the third panel so as to perform vertical locking between the first edge (11) of the first panel or the second panel and the second edge (12) of the third panel, wherein the second locking tongue (12h) of the second edge (12) and the second upper lip (129) are configured to form a tight fit around the second lower lip (119) when the second lower lip (119) is received under the second upper lip (129) in response to the folding displacement of the third panel (30).

12. The building panel set according to claim 11, in, The first dimension (d1') extends in the vertical direction between the upper surface of the second locking groove (11j) and the second lower lip (119), and the second dimension (d2') extends in the vertical direction between the upper surface of the second locking tongue (12h) and the second upper lip (129).

13. The building panel set according to claim 12, in, The second dimension (d2') is smaller than the first dimension (d1') by 0 to 0.15 mm, or by 0.01 to 0.07 mm, or by 0.02 to 0.05 mm.

14. The building panel set according to claim 12, in, The first dimension (d1') and the second dimension (d2') are sized to provide a press fit or interference fit when the second lower lip (119) is received under the second upper lip (129) in response to the folding displacement.

Images