Panel set with a mechanical locking device

Abstract

A set including a first panel (10), a second panel (20), and a mechanical locking device for locking the first panel (10) to the second panel (20), wherein the first panel (10) includes a first edge surface (11), the second panel (20) includes a second panel surface (22), and the mechanical locking device includes at least one rod-shaped element (31) provided on the first edge surface (11) and at least one insertion groove (32) provided on the second panel surface (22), and the rod-shaped element ( a first panel groove (12) configured to be inserted into the insertion groove (32); the set further comprises a back panel (40) configured to be inserted into and cooperate with at least one of the first panel groove (12) and the second panel groove (23); and at least one locking device (50) configured to cooperate with the back panel (40) and with at least one of the first panel groove (12) and the second panel groove (23) to lock the first panel (10) to the second panel (20).

Description

Technical Field

[0001] Embodiments of the present invention relate to panels that can be arranged perpendicular to each other and locked to each other by a mechanical locking device. The panels can be assembled and locked to each other to obtain furniture products such as bookshelves, cupboards, wardrobes, boxes, drawers, and furniture parts.

Background Art

[0002] As is apparent from WO2015 / 038059, furniture products with mechanical locking devices are known in the art. The furniture product includes a first panel vertically connected to a second panel by a mechanical locking device having a flexible tongue in an insertion groove.

[0003] The above description of various known aspects is a feature of the applicant's and does not admit that the above description is considered prior art.

[0004] Embodiments of the present invention meet the need for panels that can be easily assembled.

Summary of the Invention

[0005] An object of certain aspects of the present invention is to improve the above technology and known technologies, and in particular, to facilitate the assembly of panels configured to be assembled without the need to use tools.

[0006] A further object of at least certain aspects of the present invention is to facilitate the assembly of panels configured to be assembled by a locking device that is simple to manufacture and use, and to reduce the risk of misinstalling the panels.

[0007] A further object of at least certain aspects of the present invention is to facilitate the assembly of panels configured to be assembled in a more stable and aesthetic manner.

[0008] At least some of the above objects and other objects, as well as advantages, which will become apparent from the detailed description, are achieved by a set comprising a first panel, a second panel, and a mechanical locking device for locking the first panel to the second panel, wherein the first panel comprises a first edge surface, the second panel comprises a second panel surface, and in the locked state of the first and second panels, the first edge surface faces and / or is parallel to the second panel surface, the mechanical locking device comprises at least one rod-shaped element on the first edge surface and at least one insertion groove on the second panel surface, the rod-shaped element is configured to be inserted into the insertion groove, the rod-shaped element extends from the first edge surface at a first angle, the insertion groove extends into the second panel surface at a second angle from the second panel surface, the mechanical locking device comprises at least one first panel groove on the first panel surface of the first panel and / or a second panel groove on the second panel surface of the second panel, and a rear panel inserted into and configured to cooperate with at least one of the first panel groove and the second panel groove, the first angle being in the range of about 30° to about 60°, or in the range of about 40° to about 50°, or about 45°, and further comprising at least one locking member configured to cooperate with at least one of the first panel groove and the second panel groove to lock the first panel to the second panel.

[0009] The locking member 50 can be configured to cooperate with the rear panel 40 to lock the rear panel 40 to the first panel 10 and / or the second panel 20.

[0010] According to one aspect, the result of subtracting the thickness of the rear panel from the width of at least one of the first panel groove and the second panel groove is greater than or essentially the same as the extension of the rod-shaped element along the first edge surface.

[0011] According to one aspect, the rod-shaped element is disposed in a rod element groove of the first edge surface.

[0012] According to one embodiment, the width of the first panel groove is essentially the same as the width of the second panel groove.

[0013] According to one embodiment, when the first panel and the second panel are in an assembled state, the first panel groove and the second panel groove are displaced relative to each other by about 0.1 mm to about 0.6 mm, or about 0.2 mm to about 0.3 mm, before the fastener fastens the first panel to the second panel to bring the first panel and the second panel into a final fastened state.

[0014] According to one embodiment, the first panel has a second edge surface and the second panel has a third edge surface, the first panel groove is substantially parallel to the second edge surface, and the second panel groove is substantially parallel to the third edge surface.

[0015] According to one embodiment, the first panel groove extends substantially along the entire second edge surface, and the second panel groove extends essentially along the entire third edge surface.

[0016] According to one embodiment, the first panel groove and / or the second panel groove has a bottom.

[0017] According to one aspect, the fastener is flexible.

[0018] According to one aspect, the fastener comprises a spring.

[0019] According to one aspect, the fastener comprises a wedge element.

[0020] According to one embodiment, when one first panel, one second panel, and one back panel are assembled, the extension of the back panel from the first edge of the first panel is smaller than the extension of the rod-shaped element from the first edge surface.

[0021] According to one aspect, the core of the first panel and / or the second panel 20 can be a wood-based core such as MDF, HDF, OSB, WPC, plywood, or particle board. Also, the core can be a plastic core made of a thermosetting plastic or a thermoplastic such as vinyl, PVC, PU, or PET. The plastic core can include a filler.

[0022] Also, the first panel and / or the second panel 20 can be a solid wood material.

[0023] The first panel and / or the second panel can be provided with a decorative layer such as foil or veneer on one or more surfaces.

[0024] At least some of the above-identified objectives and other objectives, as well as advantages, which may become apparent from the description, have been achieved by the locking device for furniture products described above.

[0025] The above and other aspects, features, and advantages of the present invention, as long as embodiments of the present invention are possible, will become apparent from the following description of the embodiments and aspects of the present invention with reference to the accompanying drawings.

Brief Description of the Drawings

[0026]

Fig. 1A

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Fig. 5B

Fig. 5C

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Fig. 10

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Fig. 12B

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Fig. 19A

Fig. 19B

Fig. 19C

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Best Mode for Carrying Out the Invention

[0027] Specific embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention can be embodied in many different forms and should not be construed as limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. The terms used in the detailed description of the embodiments shown in the accompanying drawings are not intended to limit the present invention. In the drawings, like reference numerals refer to like elements.

[0028] The terms used herein are for the purpose of merely describing particular aspects of the disclosure and are not intended to limit the disclosure. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0029] In the drawings and the specification, exemplary aspects of the present disclosure are disclosed. However, these aspects can be variously modified and deformed without departing substantially from the principles of the present disclosure. Therefore, the present disclosure should be considered as illustrative rather than restrictive, and is not limited to the specific aspects described above. Therefore, although specific terms are used, they are used only in a general and descriptive sense and are not intended for purposes of limitation. For example, the definitions of dimensions such as width, or breadth, or height, or length, or diameter depend on how the exemplary aspects are depicted. Therefore, if the depiction is made in a different aspect, a width or diameter shown in one depiction may be a length or thickness in another depiction.

[0030] The presence of elements or steps other than those recited with the word "comprising" is not necessarily excluded, and it should be noted that the words "a" or "an" preceding an element do not exclude the presence of a plurality of such elements. Further, any of the reference signs do not limit the scope of the claims, and examples of aspects may be implemented at least in part by both hardware and software, and it should be noted that several "means", "units", or "devices" may be represented by the same item of hardware.

[0031] The different aspects, alternatives, and embodiments of the invention disclosed herein may be combined with one or more of the other aspects, alternatives, and embodiments described herein. Two or more aspects can be combined.

[0032] 1 to 18 show an embodiment of the present invention including a set. The set comprises a first panel 10, a second panel 20, and a mechanical locking device for locking the first panel 10 to the second panel 20. The first panel 10 comprises a first edge surface 11 and a first panel surface 13. The second panel 20 comprises a second panel surface 22. In a locked state of the first and second panels 10, 20, the first edge surface 11 faces or is parallel to the second panel surface 22. The mechanical locking device comprises at least one element 31 provided on the first edge surface 11 and at least one insertion groove 32 provided on the second panel surface 22. The element 31 may have a rod shape. The rod-shaped element 31 is configured to be inserted into the insertion groove 32. The rod-shaped element 31 extends from the first edge surface 11 at a first angle α1, and the insertion groove 32 extends from the second panel surface 22 into the second panel surface 22 at a second angle α2. If multiple elements 31 are present, each element 31 may be arranged parallel to each of the other elements 31. If multiple insertion grooves 32 are present, each insertion groove 32 may be arranged parallel to each of the other insertion grooves 32. The mechanical locking device comprises a first panel groove 12 in the first panel surface 13 of the first panel 10 and / or a second panel groove 23 in the second panel surface 22 of the second panel 20, and a back panel 40 configured to be inserted into and cooperate with the first and second panel grooves 12, 23, wherein the first angle α1 is in the range of about 30° to about 60°, or in the range of about 40° to about 50°, or about 45°. The mechanical locking system also includes at least one locking element 50 configured to cooperate with at least the first and second panel grooves 12, 23 to lock the first panel 10 to the second panel 20.

[0033] The fasteners 50 may be configured to cooperate with the back panel 40 to fasten the back panel 40 to the first panel 10 or the second panel 20 .

[0034] The second panel 20 may include a fourth edge surface 25. The insertion groove 32 may be disposed adjacent to the fourth edge surface 25. The set may be configured to lock the first panel 10 to the second panel 20 with the first panel surface 13 parallel or essentially parallel to the fourth edge surface 25.

[0035] The first panel 10 and the second panel 20 may be panels for furniture products and may be part of the frame of a furniture product.

[0036] The set may be configured to lock the first panel 10 to the second panel 20 with the first panel 10 perpendicular or essentially perpendicular to the second panel surface 22.

[0037] Figures 1A-3, 13-15 disclose embodiments of the set in an unassembled state. Figures 4A-12B disclose embodiments of the set in an assembled state. The set may be assembled by displacing the first panel 10 relative to the second panel 20 in assembly directions 111, 112, 114 that are essentially parallel to the first panel surface 13.

[0038] The assembly directions 111, 112, 114 may be essentially parallel to a first angle α1 and / or a second angle α2. The insertion groove 32 may be a drill hole. The drill hole may be a bottomed drill hole.

[0039] The insertion groove 32 may have a diameter D2.

[0040] As shown in Figures 13 and 14, the insertion groove 32 may include a chamfer 60 or rounding configured to guide a rod-shaped element during assembly.

[0041] The rod-shaped element 31 may be disposed in a rod element groove 36 on the first edge surface 11 of the first panel 10 or on the second panel surface 22 of the second panel 20.

[0042] The rod-shaped element 31 may have a diameter D1. The diameter D2 of the insertion groove 32 may be larger than the diameter D1 of the rod-shaped element 31. For the purpose of optimal assembly, the diameter D2 of the insertion groove 32 may be about 0.3 to about 0.8 mm larger than the diameter D1 of the rod-shaped element 31.

[0043] The locking tool 50 can be assembled to the panel set after the first panel 10, the second panel 20, and the back panel 40 are assembled, and by being inserted into the first panel groove 12 and / or the second panel groove 23, the first panel 10 is locked to the second panel 20.

[0044] The locking tool 50 can lock the back panel 40 to the first panel groove 12 and / or the second panel groove, and prevent the first panel 10 from being displaced in a direction opposite to the assembly direction with respect to the second panel.

[0045] In one aspect, the locking tool 50 cooperates with the back panel 40 so as to lock the back panel 40 to the first panel 10 and / or the second panel 20.

[0046] The first panel groove 12 on the first panel surface 13 may have a width W1.

[0047] The second panel groove 23 on the second panel surface 22 may have a width W2.

[0048] The width W1 of the first panel groove 12 may be essentially the same as the width W2 of the second panel groove 23.

[0049] Figure 4B shows that the back panel 40 can be assembled to the first panel 10 and the second panel 20 by displacing the back panel 40 in the assembly direction 113 that is essentially perpendicular to the second panel surface 22 of the second panel 20 with respect to the first panel 10 and the second panel 20. The thickness T of the back panel 40 may be essentially the same as the widths W1, W2 of the first panel groove 12 and / or the second panel groove 23.

[0050] There may be a clearance between the rear panel 40 and the first panel groove 12 and / or the second panel groove 23. As a result, the edge of the rear panel 40 is likely to be displaced in the first panel groove 12 and / or the second panel groove 23. This clearance may be in the range of about 0 mm to about 0.5 mm, or about 0.1 mm to about 0.2 mm.

[0051] In one aspect, the thickness T of the rear panel 40 is subtracted from the widths W1, W2 of the first panel groove 12 and / or the second panel groove 23, that is, ΔW is equal to or greater than the extension H of the rear panel 40 with respect to the first panel 10 or the second panel 20 after the first panel 10, the second panel 20, and the rear panel 40 are assembled. That is, ΔW≧H. Refer to FIGS. 10-14.

[0052] In one aspect, H is smaller than the extension D of the rod-shaped element 31 from the first edge surface 11.

[0053] The rod-shaped element 31 may have an extension E along the first edge surface 11.

[0054] In one aspect, when assembling a set including two first panels 10 and two second panels 20, at least one of the panels 10, 20 may have the widths W1, W1 of the first panel groove 12 and / or the second panel groove 23 that allow the extension H (see FIGS. 10 and 12A) of the rear panel 40 to be displaced within the first panel groove 12 and / or the second panel groove 23. The displacement is equal to or greater than ΔW. In one aspect, for ease of manufacturing the panels, all the panels have the same widths W1, W2 of the first panel groove 12 and / or the second panel groove 23.

[0055] The length of the rear panel 40 may be designed to avoid the extension H of the rear panel 40. The edge of the rear panel 40 may be substantially in the same plane as the first edge surface 11 of the first panel 10.

[0056] FIG. 12B is a side view of an embodiment of the first panel 10 having the first panel groove 12. The first panel groove 12 may have a width W1 and a height H1.

[0057] According to one aspect, the first panel 10 and the second panel 20 are assembled, and before the first panel 10 and the second panel 20 reach the final locked state by the locking member 50 locking the first panel 10 to the second panel 20, the first panel groove 12 and the second panel groove 23 can be displaced relative to each other by about 0.1 mm to about 0.6 mm, or about 0.2 mm to about 0.3 mm.

[0058] The first panel 10 may include a second edge surface 14. The second panel 20 may include a third edge surface 24. The first panel groove 12 may be substantially parallel to the second edge surface 14. The second panel groove 23 may be substantially parallel to the third edge surface 24. The first panel groove 12 may further extend substantially along the entire second edge surface 14. The second panel groove 23 may extend essentially along the entire third edge surface 24.

[0059] The first panel groove 12 and / or the second panel groove 23 may be bottomed. The first panel groove 12 and / or the second panel groove 23 may be formed by mechanical cutting such as milling or sawing.

[0060] The first panel groove 12 may be formed in the core of the first panel 10 on the first panel surface 13. The second panel groove 23 may be formed in the core of the second panel 20 on the second panel surface 22.

[0061] In one aspect, as shown in FIGS. 5, 6, 10, and 11, the locking member 50 may be at least one wedge inserted into the first panel groove 12 and / or the second panel groove 23 to lock the first panel 10, and / or the second panel 20, and / or the rear panel 40 in place.

[0062] 5A-C show an embodiment of fastener 50 with first wedge edge 61 and second wedge edge 62. First wedge edge 61 can be inserted into first panel groove 12 and second wedge edge 62 can be inserted into second panel groove 23 to lock first panel 10, second panel 20, and back panel 40 in a locked position.

[0063] 6 and 11 show an embodiment of a fastener 50 comprising a first wedge portion 51 and a second wedge portion 52. In the embodiment shown in FIG.

[0064] The fastener 50 may be made of, for example, a wood material, a metal, a polymer material, or the like.

[0065] In one embodiment, the fastener 50 may be rectangular, square, or triangular.

[0066] The fastener 50 may be made of, for example, a wood material, a metal, a polymer material, or the like.

[0067] In one embodiment, as shown in Figures 7-9 and 16-18, fastener 50 may include a lever arm 54 and an eccentric locking head 53 at a first end of the lever. Fastener 50 may include a locking portion 56 at a second, opposite end of lever 54. When eccentric head 53 is inserted into first panel groove 12, locking portion 53 may be inserted into second panel groove 23, or vice versa.

[0068] The lever arm 54 may be flexible so that it can bend when the locking portion 53 is inserted into the first panel groove 12 or the second panel groove 23. The bending of the lever arm 54 generates a locking force between the locking portion and the first panel groove 12 or the second panel groove 23.

[0069] The outer portion 53 of the eccentric locking head 53 may be thicker than the portion of the eccentric locking head 53 adjacent the first end of the lever.

[0070] The outer portion 53 of the eccentric locking head 53 may be provided with a friction connection 59 configured to cooperate with the first panel groove 12 or the second panel groove 23 .

[0071] The locking device 50 can be made of a polymer material such as a thermoplastic material or a metal material.

[0072] FIG. 9 shows one aspect of the present invention in a state where the first panel 10 and the second panel 20 are assembled. The rod-shaped element 31 extends at a first angle α1 of 47°. For the purpose of optimal assembly, the diameter D2 of the insertion groove 32 may be about 0.3 to about 0.8 mm larger than the diameter D1 of the rod-shaped element 31.

[0073] The first edge surface 11 may include two or more of the rod-shaped elements 31, and the second panel surface 22 may include two or more of the insertion grooves 32, and vice versa. The two or more insertion grooves 32 may be arranged linearly. Each rod-shaped element 31 is configured to be inserted into one insertion groove 32.

[0074] The cross-section of the insertion groove 32 provided on a plane parallel to the second panel surface 22 may have a shape corresponding to the cross-section of the rod-shaped element 31 provided on a plane parallel to the first edge surface 11. This can be advantageous in terms of improving the locking of the first panel 10 to the second panel 20 and facilitating the assembly of the panel set.

[0075] The rod-shaped element 31 and the insertion groove 32 are disclosed in detail with reference to FIGS. 1B, 9, 11, and 14. These figures show cross-sections along the rod-shaped element 31 and the insertion groove 32. As shown in FIG. 14, the rod-shaped element 31 extends from the first edge surface 11 at a first angle α1, and the insertion groove 32 extends into the second panel surface 22 at a second angle α2 from the second panel surface 22. FIG. 1B shows an embodiment of the rod-shaped element 31. The rod-shaped element 31 may have an elongated shape and may include a length direction 86, a width direction 85, and a center line 81 extending in the length direction.

[0076] According to one aspect, the rod-shaped element 31 is configured to be inserted into the rod element groove 36 on the first edge surface 11.

[0077] According to one embodiment, the rod-shaped element 31 is configured to be inserted into a rod element groove 36 in the second panel face 22 .

[0078] According to one embodiment, the rod-shaped element 31 may be configured to be frictionally mounted within the rod element groove 36 .

[0079] According to one embodiment, the rod-shaped element 31 can be configured to be glued within the rod element groove 36 .

[0080] According to one embodiment, the rod-shaped element 31, and the rod element groove 36, and the insertion groove 32 may have a substantially circular shape, although other shapes such as triangular, rectangular, square, etc. are also possible.

[0081] According to one embodiment, if α1≠α2, the extension D of the rod-shaped element 31 may be changed to point in a direction in which the maximum locking force generated from the locking device 50 can be achieved.

[0082] According to one embodiment shown in FIG. 13, the first edge surface 11 may have at least one element 31 while the opposing edge surface may have at least one insertion groove 32 .

[0083] According to another embodiment, the first edge surface 11 may have at least one element 31 in combination with at least one insertion groove 32. The corresponding second panel surface 22 may have at least one insertion groove 32 in combination with at least one element 31.

[0084] According to one embodiment shown in Figure 14, the position of at least one rod-shaped element 31 may be located at a first distance 83 from the second edge surface 14. The first distance may be a dimension from the second edge surface 14 to a center line 81 of the rod-shaped element 31. The corresponding insertion groove 32 may be located at a second distance 84 from the third edge surface 24. The second distance may be a dimension from the third edge surface 24 to a center line 82 of the insertion groove 32. The first distance may be different from the second distance. This may increase the locking force.

[0085] The difference between the first distance and the second distance can be in the range of about 0.1 mm to about 0.5 mm.

[0086] According to one embodiment, the rod-shaped element 31 is made from one or more of a wood material and a polymer material, which may include reinforcements such as glass fibre or metal.

[0087] According to one embodiment, the rod-shaped element 31 may have a waxed surface to facilitate assembly.

[0088] According to one embodiment, the rod-shaped element 31 may be configured to cooperate with a bottom surface of the insertion groove 32 in the locked state.

[0089] The side walls of the insertion groove 32 may consist of the material of the core of the first panel 10 or the second panel 20, depending on which panel the insertion groove 32 is made in and on which panel the rod-shaped element 31 is attached. According to one embodiment, they may be reinforced, for example with metal or glass fiber.

[0090] According to one embodiment, the first panel groove 12 and / or the second panel groove 23 may be liquid impregnated / reinforced.

[0091] According to one embodiment, the first panel 10 and the second panel 20 may be assembled by displacing the first panel 10 relative to the second panel 20 in a direction that is essentially parallel to the first panel surface 13 .

[0092] According to one embodiment, the first panel 10 comprises two or more of the above-mentioned second edge surfaces 11. In other words, one or more rod-shaped elements 31 may be arranged on two or more edges of the first panel 10, as disclosed in Figures 2, 3 and 10.

[0093] According to one embodiment, the first panel 10 may comprise two or more of the above-mentioned second edge surfaces 11. In other words, one or more rod-shaped elements 31 may be disposed on two or more edges of the first panel 10, as disclosed in Figures 2-4, 9, 11, 12, and 16.

[0094] According to one embodiment, the second panel 20 may include two or more of the above-described fourth edge surfaces 25. In other words, as disclosed in Figures 1A, 2, 3, 13, and 15, one or more of the insertion grooves 32 may be disposed adjacent to two or more edges of the second panel 10.

[0095] According to one embodiment, two first panels 10, two second panels 20, and one back panel 40 can be assembled as shown in FIG.

[0096] The left-hand embodiment of the first panel 10 can be assembled to the bottom-hand embodiment of the second panel 20 by displacing the left-hand embodiment of the first panel 10 relative to the bottom-hand embodiment of the second panel 20 in an assembly direction 111. The right-hand embodiment of the first panel 10 can be assembled to the bottom-hand embodiment of the second panel 20 by displacing the right-hand embodiment of the first panel 10 relative to the bottom-hand embodiment of the second panel 20 in an assembly direction 112. The back panel 40 can be assembled to the left-hand and right-hand embodiments of the first panel 10 and the bottom-hand embodiment of the second panel 20 by displacing the back panel 40 embodiment in an assembly direction 113 that is essentially perpendicular to the second panel surface 22 of the bottom-hand embodiment of the second panel 20. The top-hand embodiment of the second panel 20 can be assembled to the left-hand and right-hand embodiments of the first panel 10 and the back panel 40 by displacing the top-hand embodiment of the second panel 20 in an assembly direction 114.

[0097] In the locked state, the length 93 of the rear panel 40 that can be inserted into the panel groove 12 of the first panel 10 may be essentially the same as or greater than the length 94 of the first panel 10 at the second edge surface 14 of the first panel. The length 93 of the rear panel 40 may be equal to the length 94 of the first panel 10 plus approximately half to approximately twice the height H1 of the panel groove 12, or may be equal to the length 94 of the first panel 10 plus the height H1 of the panel groove 12. FIG. 15 shows the length 93 of the rear panel 40 extending between the upper edge 87 and the lower edge 88 of the rear panel.

[0098] Figs. 19A - D are partial enlarged views of the set during assembly. FIG. 19A shows an embodiment in a first state where the rear panel 40 is inserted into the panel groove 12 of the first panel 10. The upper edge 87 of the rear panel 40 is below the first edge surface 11 of the first panel. FIG. 19C shows that in this first state, the lower edge 88 of the rear panel can contact the lower surface 89 of the panel groove 23 of the lower second panel 20. FIG. 19B shows an embodiment in a second state where the upper second panel 20 is displaced to 114 and assembled to the first panel 10, and the rear panel 40 is displaced to a position where the upper edge 87 of the rear panel 40 reaches within the panel groove 23 of the upper second panel 20. FIG. 19D shows that in this second state, the lower edge 88 of the rear panel can be at a distance 91 from the lower surface 89 of the panel groove 23 of the lower second panel 20. The lower edge 88 of the rear panel 40 can be disposed at a distance 91 from the second panel surface 22 of the second panel. This distance can be in the range of approximately 1 / 3 to approximately 2 / 3 of the height H2 of the panel groove 23 of the second panel, or can be approximately half of the height H2 of the panel groove 23 of the second panel.

[0099] The height H2 of the panel groove 23 of the lower second panel groove may be greater than the height H2 of the panel groove 23 of the upper second panel groove. The set may be rotated so that the upper edge 87 of the rear panel 40 enters the panel groove 23 of the upper second panel 20 due to the displacement of the rear panel by gravity.

[0100] The rear panel can be displaced by gravity or by hand. The state where the upper edge 87 of the rear panel 40 is within the panel groove 23 of the upper second panel 20 can be maintained by disposing a positioning element 92 between the rear panel and the panel groove 12 of the first panel and / or between the rear panel and the panel groove 23 of the second panel.

[0101] An embodiment of the first panel groove 12 may include a width W1 that is essentially the same as the thickness T of the rear panel 40. A part of the first panel groove 12 may be wider. Thereby, an embodiment of the fastener 50 can be disposed between the rear panel and the first panel groove 12, so that the state where the upper edge 87 of the rear panel 40 is within the panel groove 23 of the upper second panel 20 is maintained.

[0102] An embodiment of the second panel groove 24 may include a width W that is essentially the same as the thickness T of the rear panel 40. A part of the second panel groove 23 may be wider. Thereby, an embodiment of the fastener 50 can be disposed between the rear panel 40 and the second panel groove 23, so that the state where the upper edge 87 of the rear panel 40 is within the second panel groove 23 of the upper second panel 20 is maintained.

[0103] According to an embodiment of the locking device 4 disclosed in WO2019125292 or WO2019125291, the rear panel can be displaceable, and the state where the upper edge 87 of the rear panel 40 is within the panel groove 23 of the upper second panel 20 can be maintained.

[0104] The core of the first panel 10 and / or the second panel 20 can be a wood-based core such as MDF, HDF, OSB, WPC, plywood, or particle board. Also, the core can be a plastic core made of a thermosetting plastic or a thermoplastic such as vinyl, PVC, PU, or PET. The plastic core can include a filler.

[0105] Also, the first panel 10 and / or the second panel 20 can be a solid wood material.

[0106] The first panel 10 and / or the second panel 20 may be provided with a decorative layer such as foil or veneer on one or more surfaces.

[0107] According to one aspect, the set of panels is a panel having elasticity. The panel having elasticity may include a core made of a thermoplastic material. The thermoplastic material may be foamed.

[0108] The thermoplastic material may include polyvinyl chloride (PVC), polyester, polypropylene (PP), polyethylene (PE), polystyrene (PS), polyurethane (PU), polyethylene terephthalate (PET), polyacrylate, methacrylate, polycarbonate, polyvinyl butyral, polybutylene terephthalate, or a combination thereof. The core may be formed of multiple layers.

[0109] The above-described aspect may include a decorative layer such as a decorative foil made of a thermoplastic material. The thermoplastic material of the decorative layer may be polyvinyl chloride (PVC), polyester, polypropylene (PP), polyethylene (PE), polystyrene (PS), polyurethane (PU), polyethylene terephthalate (PET), polyacrylate, methacrylate, polycarbonate, polyvinyl butyral, polybutylene terephthalate, or a combination thereof, or may include these. The decorative foil may be printed, for example, by direct printing, gravure printing, or digital printing. According to one aspect, the decorative layer is made of melamine, high-pressure laminate (HPL), or veneer.

[0110] The above-described aspect may include a wear layer such as a film or foil. The wear layer may be made of a thermoplastic material. The thermoplastic material may be polyvinyl chloride (PVC), polyester, polypropylene (PP), polyethylene (PE), polystyrene (PS), polyurethane (PU), polyethylene terephthalate (PET), polyacrylate, methacrylate, polycarbonate, polyvinyl butyral, polybutylene terephthalate, or a combination thereof.

[0111] The above aspects may comprise a wood-based core such as HDF, MDF, plywood, particle board, OSB or masonite.

[0112] The various aspects, embodiments and alternatives described above can be combined in any single or multiple combinations of the other aspects, embodiments and alternatives described.

Claims

1. In a set comprising a first panel (10), a second panel (20), and a mechanical locking device for locking the first panel (10) to the second panel (20), - the first panel (10) comprises a first edge surface (11) and a first panel surface (13), - the second panel (20) comprises a second panel surface (22), - the first panel (10) and the second panel (20) are panels for a furniture product, such as part of a frame of a furniture product, - in the locked state of the first and second panels (10, 20), the first edge surface (11) faces or is parallel to the second panel surface (22), - in the locked state of the first and second panels (10, 20), the first panel surface (13) of the first panel (10) is perpendicular to the second panel surface (22) of the second panel (20), - the mechanical locking device comprises at least one rod-shaped element (31) on the first edge surface (11) and at least one insertion groove (32) on the second panel surface (22), - the rod-shaped element (31) is configured to be inserted into the insertion groove (32), - the rod-shaped element (31) extends from the first edge surface (11) at a first angle (α1), - the insertion groove (32) extends into the second panel surface (22) at a second angle (α2) from the second panel surface (22), - the mechanical locking device comprises at least one first panel groove (12) on the first panel surface (13) of the first panel (10) and at least one second panel groove (23) on the second panel surface (22) of the second panel (20), - and a rear panel (40) inserted into one of the first panel groove (12) and the second panel groove (23) and configured to cooperate with it, - the first angle (α1) is in the range of about 30° to about 60°, or in the range of about 40° to about 50°, or is about 45°, - further comprising at least one locking member (50) configured to cooperate with the rear panel (40) and at least one of the first panel groove (12) and the second panel groove (23) to lock the first panel (10) to the second panel (20), The locking device (50) includes a lever arm (54) and an eccentric locking head (53) provided at a first end of the lever arm (54). The eccentric locking head (53) is inserted into one of the first panel groove (12) and the second panel groove (23), and a second end of the lever arm (54) opposite to the first end is inserted into the other of the first panel groove (12) and the second panel groove (23). Either one of one end of the eccentric locking head (53) and the second end is engaged with the back panel (40), so that the lever arm (54) is curved and the first panel (10) is locked to the second panel (20). **Claim 2** The result of subtracting the thickness (T) of the back panel (40) from the width (W1, W2) of one of the first panel groove (12) and the second panel groove (23) is greater than or equal to an extension (H) of the back panel (40) with respect to the first panel (10) or the second panel (20) after the first panel (10), the second panel (20), and the back panel (40) are assembled. The set according to claim 1. **Claim 3** The rod-shaped element (31) is arranged in a rod element groove (36) on the first edge surface (11). The set according to claim 1 or 2. **Claim 4** The width (W1) of the first panel groove (12) is the same as the width (W2) of the second panel groove (23). The set according to any one of claims 1 to **Claim 5** The first panel (10) includes a second edge surface (14). The second panel (20) includes a third edge surface (24). The first panel groove (12) is parallel to the second edge surface (14). The second panel groove (23) is parallel to the third edge surface (24). The set according to any one of claims 1 to 4. **Claim 6** The first panel groove (12) extends along the entire second edge surface (14). The second panel groove (23) extends along the entire third edge surface (24). The set according to claim 5. **Claim 7** At least one of the first panel groove (12) and the second panel groove (23) has a bottom. The set according to any one of claims 1 to 6. **Claim 8** The locking device (50) is configured to further cooperate with the rear panel (40) so as to lock the rear panel (40) to the first panel (10) and / or the second panel (20). The set according to any one of claims 1 to 7.

9. The outer portion of the eccentric locking head (53) comprises a friction connection portion (59) configured to cooperate with the first panel groove (12) or the second panel groove (23). The set according to any one of claims 1 to 8.

10. The outer portion of the eccentric locking head (53) is thicker than a part of the eccentric locking head (53) adjacent to the first end of the lever arm. The set according to any one of claims 1 to 9.

11. The locking device (50) includes a polymer material such as a thermoplastic material. The set according to any one of claims 1 to 9.

12. When one first panel, one second panel, and one rear panel are assembled, an extension (H) of the rear panel from the first edge surface (11) of the first panel (10) is smaller than an extension of the rod-shaped element (31) from the first edge surface (11) of the first panel (10). The set according to any one of claims 1 to 11.

13. The rod-shaped element (31) is formed of a wood material. The set according to any one of claims 1 to 12.

14. The rod-shaped element (31) is configured to be adhered within a rod element groove (36) in the first edge surface (11). The set according to any one of claims 1 to 13.

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