Patent Publication Number: US-2022228615-A1

Title: Set of panels, a method for assembly of the same, and a locking device for a furniture product

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     The present application claims the benefit of Swedish Application No. 2150058-2, filed on 20 Jan. 2021 and Swedish Application No. 2150050-9, filed on 19 Jan. 2021. The entire contents of each of Swedish Application No. 2150058-2 and Swedish Application No. 2150050-9 are hereby incorporated herein by reference in their entirety. 
     TECHNICAL FIELD 
     Embodiments of the present invention relate to panels that may be arranged perpendicular to each other and locked together with a mechanical locking device. The panels may be assembled and locked together to obtain a furniture product, such as a bookshelf, a cupboard, a wardrobe, a box, a drawer or a furniture component. 
     BACKGROUND 
     A furniture product provided with a mechanical locking device is known in the art, as disclosed in WO 2014/072080. The furniture product comprises a first panel connected perpendicular to a second panel by a mechanical locking device comprising a flexible tongue in an insertion groove and a pin that is inserted into the mechanical locking device to move the flexible tongue. 
     Embodiments of the present invention address a need to provide an easier assembling and/or an increased locking strength of the panels. 
     SUMMARY 
     It is an object of at least certain embodiments and aspects of the present invention to provide an improvement over the above described techniques and known art. 
     A further object of at least certain aspects of the present invention is to facilitate assembling of panels configured to be assembled without the need of using any tools. 
     A further object of at least certain aspects of the present invention is to facilitate disassembling of panels configured to be assembled and disassembling without the need of tools. 
     A further object of at least certain aspects of the present invention is to facilitate assembling of panels configured to be assembled with a locking device that is easy to manufacture and to use. 
     A further object of at least certain aspects of the present invention is to facilitate assembling of panels configured to be assembled with a locking device that is in one piece. 
     At least some of these and other objects and advantages that may be apparent from the description have been achieved by a first aspect: a locking device for a furniture product comprising a panel comprising a groove and at least one hole connected to the groove via an opening, and an adjacent panel comprising a first edge that is configured to be arranged in the groove of the panel. The locking device is configured to lock the first edge of the adjacent panel in the groove of the panel. The locking device comprises a cylinder and a lever connected to the cylinder. The cylinder is configured to be arranged in the hole in the panel. The cylinder is configured to be displaceable in said hole between a first mounting position and a second locking position by means of rotation of said cylinder. 
     In one embodiment, the cylinder comprises a first locking surface configured to engage with the adjacent panel by means of a clockwise rotation of said cylinder for locking the adjacent panel to the panel. 
     The cylinder may preferably comprise a second locking surface configured to engage with said adjacent panel by means of a counter-clockwise rotation of said cylinder for locking the adjacent panel to the panel. 
     Further embodiments of the locking device being described below in relation to the second aspect. 
     At least some of these and other objects and advantages that may be apparent from the description have been achieved by a second aspect: a set of panels, preferably for a furniture product, comprising a panel, an adjacent panel and a locking device. The panel comprises a groove and at least one hole connected to the groove via an opening. The adjacent panel comprises a first edge that is configured to be arranged in the groove of the panel. The locking device is configured to lock the first edge of the adjacent panel in the groove of the panel. The locking device comprises a cylinder and a lever connected to the cylinder. The cylinder is configured to be arranged in the hole in the panel. The cylinder is configured to be displaceable in said hole between a first mounting position and a second locking position by means of rotation of said cylinder. 
     In one embodiment, the cylinder comprises a first locking surface configured to engage with the adjacent panel by means of a clockwise rotation of said cylinder for locking the adjacent panel to the panel. 
     The cylinder may preferably comprise a second locking surface configured to engage with said adjacent panel by means of a counter-clockwise rotation of said cylinder for locking the adjacent panel to the panel. 
     By a set of panels in accordance to this the adjacent panel and the panel could be locked to each other in an effective way and in an easy way. The eccentric cylinder exerts a force to the adjacent panel that locks the adjacent panel and the panel together in a good way. Embodiments of the locking device do not need any tools to be used. Further, the locking device may be a single piece that is easy to use. Further, by only having a single piece locking device the manufacturing of the locking device could be made in one step and thus reduce the cost for the locking device. Embodiments of the set of panels may involve the advantage that the adjacent panel does not need to be machined in a specific manner to be able to interact with the locking device. 
     In one embodiment, the locking device comprises a plane, preferably being a plane of symmetry, wherein the first locking surface is provided on a first side of said plane and the second locking surface is provided on an opposite second side of said plane. 
     The said plane may preferably be a centre plane of the locking device. 
     The cylinder may comprise an essentially planar surface configured to be arranged adjacent and/or facing the opening in said first mounting position, preferably said planar surface is orthogonal the said plane and the bottom base. 
     In one embodiment, each locking surface comprises at least two, preferably three ridges protruding in a radial direction from the cylinder. 
     The cylinder, excluding the planar surface and the ridges, may have a circular cross section and an elliptical cross section including the ridges. 
     The lever may extend from an inner end to an outer end in a direction substantially transverse the planar surface. 
     In one embodiment, the said plane is configured to be arranged substantially orthogonal the adjacent panel and the panel in the mounting position. 
     The plane may be orthogonal the planar surface and a bottom base of the cylinder. 
     In one embodiment, the cylinder comprises at least one cross-section portion parallel the planar surface being configured to lock the first edge of the adjacent panel in the groove by means of any of a clockwise rotation of the cylinder and a counter-clockwise rotation of the cylinder initiated in the mounting position. 
     The hole and the first edge may form a D-shape when the first edge is configured in said groove. 
     In one embodiment, the cylinder comprises a first width and a second width in a plane transverse a longitudinal centre axis of the cylinder, the first width being parallel the planar surface and a second width transverse the planar surface. 
     The first width of the cylinder may be equal or less than the first width of the hole and exceed a sum of the first width of the hole minus the height of a circular segment of hole by which the hole extends into the groove. 
     The ridges may extend discontinuously along a circumference of the cylinder. 
     In one embodiment, the ridges are essentially non-helical. 
     One or more of said ridges, preferably a most distal ridge, may extend directly contiguous with said planar surface such that said planar surface is at least partially formed in at least one of said ridges. 
     In one embodiment, one or more of said ridges are separated said planar surface along a circumference of the cylinder such that said planar surface is not formed said ridges. 
     At least a portion of an inner circumferential surface of the cylinder extending from the planar surface, or between the planar surfaces, may comprise a constant radius. 
     In one embodiment, the locking device is configured to obtain said mounting position by means of arranging said planar surface facing said adjacent panel. 
     The locking device may be configured to obtain said mounting position by means of displacement of the cylinder along its longitudinal axis into said hole while not rotating the cylinder. 
     In one embodiment, the planar surface forms a single D cross-section. 
     The planar surface and the adjacent panel form a vertical plane in the mounting position. 
     In one embodiment, the cylinder is configured such that, the extension of the cylinder in a direction transverse the opening is increased in response to rotation of the cylinder initiated in said mounting position. 
     The adjacent panel and the hole form a D-shaped cross-section. 
     In one embodiment, a most distal and/or bottom ridge comprises a greater volume than one or more proximal ridges. 
     A first distance, measured along a centre axis of the cylinder, between a most distal and/or bottom ridge and a proximal neighbouring ridge may be smaller than a second distance between two proximal ridges. 
     In one embodiment, the device is essentially symmetric and preferably comprises a centre plane which is a plane of symmetry. 
     In one embodiment, the cylinder comprises a first locking surface on a first side of the centre plane and a second locking surface on an opposite second side. 
     In one embodiment, the locking surface of the cylinder comprises a D-shape or a double-D shape, which gives the advantages of that the mounting and locking positions could be stable positions and that the user could get tactile feedback when turning the lever. 
     In one embodiment, the locking device is arranged to, in the locking position, lock the adjacent panel to the panel by pressing it against a wall of the groove. 
     In one embodiment, the hole is a circular hole, a circular segment of the hole extends into the groove with the height of the circular segment and the chord of the circular segment defines a width of the opening. 
     In one embodiment, a largest diameter of the cylinder is substantially equal to the diameter of the hole, which involves that the locking device could be fastened in the hole via friction and at the same time be turned. 
     In one embodiment, the part of the locking surface extends, in the locking position, through the opening into the groove with a length that is 5-25% of the largest diameter of the cylinder, preferably the length is 10-15% of the largest diameter of the cylinder. 
     In one embodiment, the length in the radial direction of the cylinder that the part of the locking surface extends into the groove in the locking position substantially corresponds to the height of the circular segment. 
     In one embodiment, the cylinder, in the mounting position, does not extend through the opening into the groove. The groove is thus free to insert the adjacent panel. 
     In one embodiment, the length of the part of the locking surface that extends into the groove through the opening is configured to gradually increase when the locking device is moved from the mounting position to the locking position, which gives the user a tactile feedback of that the adjacent panel is locked. 
     In one embodiment, the locking surface of the cylinder comprises one or more ridges to increase the force that the locking device exert on the adjacent panel, by concentrating the force to one or more points. The ridges can also cut into the adjacent panel and/or the wall of the hole to increase the strength of the locking device and the force exerted. 
     In one embodiment, the one or more ridges extend around at least a part of a circumference of the locking surface, which opens up for that the force from the locking device could be different in different positions. 
     In one embodiment, a height of the ridges varies along its extension which further opens up for that the force from the locking device could be different in different positions. 
     In one embodiment, the one or more ridges, preferably all the ridges, each extend in a respective plane, such as a horizontal plane or a plane parallel the bottom base. 
     In one embodiment, the one or more ridges has a non-helical shape configured to press the adjacent panel when moving the locking device from the mounting position to the locking position. 
     In one embodiment, the adjacent panel comprises a second hole that is configured to be arranged at the opening and to interact with the cylinder to lock the adjacent panel to the panel. In one embodiment, the locking surface of the cylinder comprise at least one ridge that, in the locking position, is configured to be arranged at least partly in the second hole. In addition to the pressing force exerted from the locking device, the second hole interacting with the cylinder achieves a further mechanical lock. The set of panels also involves the advantage of that the adjacent panel does not need to be machined in a complicated manner, since a hole could be accomplished in an easy and cost efficient manner. 
     In one embodiment, the lever is connected to the cylinder at an inner end and at an outer end comprises a lock pin that, in the locking position, is configured to be arranged in the groove at a distance from the hole and to lock the lever from turning from the locking position towards the mounting position. 
     In one embodiment, the locking device is configured such that the outer end of the lever is, in the mounting position, arranged at a distance from the adjacent panel and in the locking position adjacent, preferably in contact, with the adjacent panel, which makes it easy for a user to grab the outer end and to turn the locking device. 
     In one embodiment, the locking device is configured such that the lever extends, in the mounting position, in an essentially perpendicular direction or within the range of about 70° to about 110° from the adjacent panel. 
     In one embodiment, the locking device is configured to be moved between the mounting position and the locking position by turning the lever and the cylinder between 0°-100°, preferably between 0°-90°. 
     In one embodiment, the panel and the adjacent panel is one of a bottom piece of a drawer, a frame and a back piece of a furniture product. 
     At least some of the above identified and other objects and advantages that may be apparent from the description have been achieved by a locking device for a furniture product in accordance with the above. 
     At least some of the above and other objects and advantages that may be apparent from the description have been achieved by a third aspect: a method for assembly of a set of panels in accordance to the above. The method comprising: inserting the first edge of the adjacent panel into the groove of the panel; inserting the cylinder of the locking device into the hole of the panel to a mounting position, and turning the lever in any of a first locking direction, such as a clockwise direction, or an opposite second locking direction, such as a counter-clockwise direction, to move the locking device from the mounting position to a respective first or second locking position to lock the first edge of the adjacent panel in the groove. 
     In one embodiment, the method comprise the further steps of turning the lever in a first unlocking direction or an opposite second unlocking direction to move the locking device from the locking position to the mounting position to unlock the first edge of the adjacent panel in the groove, and removing the first edge of the adjacent panel from the groove of the panel. 
     At least some of the above and other objects and advantages that may be apparent from the description have been achieved by a fourth aspect: a method for assembly of a set of panels in accordance to the above. The method comprising: inserting the first edge of the adjacent panel into the groove of the panel; inserting the cylinder of a first of said locking device into a first hole of the panel to a mounting position; turning the lever of the first locking of said device in a first locking direction, such as a clockwise direction, to move the locking device from the mounting position to a locking position to lock the first edge of the adjacent panel in the groove; inserting a the cylinder of a second of said locking device into a second hole of the panel to a mounting position; turning the lever of the second of said locking device in a second locking direction being opposite the first locking direction, such as a counter-clockwise direction, to move the second of said locking device from the mounting position to a locking position to lock the first edge of the adjacent panel in the groove. Preferably the respective levers of the first and the second of said locking device extend in opposite directions in the locking position. 
     In one embodiment, the method comprise the further steps of turning the respective lever of the first and the second of said locking device in an unlocking direction being opposite the respective locking direction, to move the locking device from the locking position to the mounting position to unlock the first edge of the adjacent panel in the groove, and removing the first edge of the adjacent panel from the groove of the panel. 
     Further aspects of the invention are disclosed in the appended claims. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       These and other aspects, features and advantages of which embodiments of the invention are capable of, will be apparent and elucidated from the following description of embodiments of the present invention, reference being made to the accompanying drawings, in which: 
         FIG. 1  is a perspective view of a set of panels in one embodiment of the invention in an unassembled state. 
         FIG. 2A  illustrates one embodiment of assembling a panel with an adjacent panel. 
         FIG. 2B  illustrates one embodiment of disassembling a panel and an adjacent panel. 
         FIG. 3A  illustrates a further embodiment of assembling a panel with an adjacent panel. 
         FIG. 3B  illustrates a further embodiment of disassembling a panel and an adjacent panel. 
         FIG. 4A  is a cross sectional view of a part of a panel disclosing a groove and a hole. 
         FIG. 4B  is a view from above of a part of a panel disclosing the groove and the hole. 
         FIG. 5A  is a cross sectional view of a part of an unassembled set of panels disclosing the adjacent panel in the groove and the cylinder in the hole. 
         FIG. 5B  is a cross sectional view of a part of an assembled set of panels disclosing the adjacent panel in the groove and the cylinder in the hole. 
         FIG. 5C  is a cross sectional view of a part of an assembled set of panels disclosing the adjacent panel in the groove and the cylinder in the hole. 
         FIG. 6A  shows a furniture product comprising four panels according to an embodiment. 
         FIG. 6B  shows details of the embodiment of  FIG. 6A . 
         FIG. 6C  shows details of the embodiment of  FIG. 6B . 
         FIG. 6D  shows details of the embodiment of  FIG. 6B . 
         FIGS. 7A-7B  show 3D-views of a locking device according to an embodiment. 
         FIG. 7C  shows a side view of the locking device of  FIGS. 7A-7B . 
         FIG. 7D  is a bottom view of the locking device of  FIGS. 7A-7B . 
         FIG. 7E  is a top view of the locking device of  FIGS. 7A-7B . 
         FIG. 8A  is a front view of a locking device according to an embodiment. 
         FIG. 8B  is rear view of a locking device according to an embodiment. 
         FIG. 8C  shows details of the embodiment of  FIG. 8A . 
         FIG. 8D  is a cross-sectional view of a cylinder according to an embodiment. 
         FIG. 9A  shows a furniture product comprising four panels and a locking device configured in mounting position, according to an embodiment. 
         FIG. 9B  shows details of the embodiment of  FIG. 9A . 
         FIG. 9C  shows details of the embodiment of  FIG. 9B . 
         FIG. 9D  shows details of the embodiment of  FIG. 9B . 
         FIG. 10A  shows a furniture product comprising four panels and a locking device configured in locking position, according to an embodiment. 
         FIG. 10B  shows details of the embodiment of  FIG. 10A . 
         FIG. 10C  shows details of the embodiment of  FIG. 10B . 
         FIG. 10D  shows details of the embodiment of  FIG. 10B . 
         FIGS. 11A-11B  show 3D-views of a locking device according to an embodiment. 
         FIG. 11C  shows a side view of the locking device of  FIGS. 11A-11B . 
         FIG. 11D  is a bottom view of the locking device of  FIGS. 11A-11B . 
         FIG. 11E  is a top view of the locking device of  FIGS. 11A-11B   
         FIGS. 12A-C  each shows a part of furniture product comprising two panels and an embodiment of the locking device configured in locking position, according to an embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     Aspects of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings. The set of panels and their parts disclosed herein can, however, be realized in many different forms and should not be construed as being limited to the aspects set forth herein. Like numbers in the drawings refer to like elements throughout. 
     The terminology used herein is for the purpose of describing particular aspects of the disclosure only, and is 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. 
     In the drawings and specification, there have been disclosed exemplary aspects of the disclosure. However, many variations and modifications can be made to these aspects without substantially departing from the principles of the present disclosure. Thus, the disclosure should be regarded as illustrative rather than restrictive, and not as being limited to the particular aspects discussed above. Accordingly, although specific terms are employed, they are used in a generic and descriptive sense only and not for purposes of limitation, for example, definition of dimensions such as width or breadth or height or length or diameter depends on how exemplary aspects are depicted, hence, if depicted differently, a shown width or diameter in one depiction is a length or thickness in another depiction. 
     It should be noted that the word “comprising” does not necessarily exclude the presence of other elements or steps than those listed and the words “a” or “an” preceding an element do not exclude the presence of a plurality of such elements. It should further be noted that any reference signs do not limit the scope of the claims, that the example aspects may be implemented at least in part by means of both hardware and software, and that several “means”, “units” or “devices” may be represented by the same embodiment of hardware. 
     When the word “about” is used in this specification in connection with a numerical value, it is intended that the associated numerical value include a tolerance of +/−10% around the stated numerical value. 
     The different aspects of the invention disclosed herein can be combined with the other aspects described herein. Two or more aspects could be combined. 
     An embodiment of the present invention, as shown in  FIG. 1 , to which now is referred to, discloses a set of panels  1 . The set of panels  1  are preferably for a furniture product. The set of panels  1  comprise a panel  2  and an adjacent panel  3 . The panel  2  and the adjacent panel  3  are arranged to be connected to each other and be perpendicular to each other. The panel  2  and the adjacent panel  3  each preferably comprises four edges, an outer surface  5 ,  6  and an inner surface  7 ,  8 . The outer and/or the inner surfaces may comprise a decorative layer (not shown). 
     An embodiment of the panel  2  is disclosed in  FIGS. 1, 2A-2B, 3A-5C, 6A-6D, 9A-9D   10 A- 10 D and  12 A- 12 D. The panel  2  comprises a groove  21  and at least one hole  22 . The hole  22  is connected to the groove  21  via an opening  23 . Referring to  FIG. 4A , the groove  21  has a depth D 21  and a width W. The groove  21  runs, in one embodiment, parallel to an edge of the panel  2 . The groove  21  may extent the entire length of the parallel edge of the panel  2 ; alternatively, the groove  21  may extend less than the entire length of the parallel edge of the panel  2 . The length of the groove  21  is, in one embodiment, equal to or larger than the length of a first edge  31  of the adjacent panel  3  that should be arranged in the groove  21 . The circumference of the hole  22 , in one embodiment, overlaps an extension of the groove  21 . A plane that defines the connection between the hole  22  and the groove  21  is defined as the opening  23 . The hole  22  has a depth D 22 . The hole  22  may be a through-hole (not shown) extending all the way through the panel  2 . As mentioned, depth D 22  may be the same or substantially the same as depth D 21 ; alternatively, depth D 22  may be greater than depth D 21 . 
     In one embodiment, the hole  22  is a circular hole  22 , as disclosed in  FIG. 4B . A circular segment  25  of the hole  23  overlaps with the groove  21 . The circular segment  25  may extend into the groove  21 . The hole  22  extends into the groove  21  with the height h of the circular segment  25 . A chord of the circular segment  25  that extends into the groove  21  is another way to describe the opening  23 . The length of the chord of the circular segment  25  defines a width cw of the opening  23 . The hole  22  has a diameter dH. 
     The groove  21  has a wall  24  and a bottom  26 . The hole  22  has wall  27  and a bottom  28 . The hole  22  defines an axis A. 
     The adjacent panel  3  comprises a first edge  31 , as disclosed in  FIGS. 1, 6D, 9D and 10D . The first edge  31  of the adjacent panel  3  is configured to be arranged in the groove  21  of the panel  2 . The thickness of the adjacent panel  3 , at least at the first edge  31 , is equal to or smaller than the width W of the groove  21  of the panel  2 . The adjacent panel  3  may comprise a second hole  32 . The position of the second hole  32  is such that it is configured to be arranged at the opening  23  of the panel  2 . The second hole  32  may be configured to interact with the cylinder  41  to lock the adjacent panel  3  to the panel  2 . The second hole  32  has a wall  33 . The second hole  32  may be a through-hole  32 , i.e. a through-going hole. The second hole  32  may have a bottom (not shown). 
     The locking device  4  is configured to lock the first edge  31  of the adjacent panel  3  in the groove  21  of the panel  2 . The locking device  4  may be adapted to lock the adjacent panel  3  to the panel  2 . By lock is meant that that the first edge  31  of the adjacent panel  3  is restricted from moving out of the groove  21  of the panel  2 ; this may be from moving out of the groove  21  in the opposite direction as the arrow in  FIG. 1  and/or laterally along the length of the groove  21 . The locking device  4  may increase the force in at least one direction that has to be exerted to the adjacent panel  3  in comparison to the force that has to be exerted to the adjacent panel  3  to remove it from the groove  21  without the locking device  4 . For example, the increased force may be at least twice as great, or at least five times as great. 
     Embodiment of the locking device  4  is disclosed in more detail in  FIGS. 7A-7E, 8A-8D, 11A-11E and 12A-12C . The locking device  4  comprises a cylinder  41  and, preferably, a lever  42 . In an embodiment, the locking device could be configured to be rotated with a tool. For example, the locking device could including a groove or grooves (not shown) on a top base configured to allow the locking device to be rotated by means of a screw driver, alien wrench, or similar tool. The lever  42  is connected to the cylinder  41 . The cylinder  41  is configured to be arranged in the hole  22  in the panel  2 . The cylinder  41  is at least partially a circular cylinder  41 . At least a portion of the cylinder  41  may have a constant radius R 1 . Apart from one or more ridges  46  and an essentially planar surface  47 , the cylinder may preferably have a constant radius R 1 . The cylinder comprises a top base  43 , a bottom base  44 . A locking surface  45  comprising a first locking surface  45   a  and an opposite second locking surface  45   b  connects the top and bottom base  43 ,  44 . 
     The locking device  4  may be made of a material that is one or a mix of a metal or a polymer material, such as a thermoplastic material, preferably with a reinforcement, such as glass fibre. The locking device  4  may be produced by injection moulding. 
     The cylinder  41  is configured to act as a cam when the cylinder  41  is turned about the axis A in the hole  22 . The cylinder  41  will interact with the adjacent panel  3  and may displace the adjacent panel  3  when it is turned, or at least exert a force on the adjacent panel  3 . The largest diameter dL of the cylinder  41  may be substantially equal to the diameter of the hole dH. Substantially equal may be within 10% of each other, or within 5% of each other, or within 3% of each other. By having the diameter, including the largest diameter dL, of the cylinder  41  being designed to correlate with the diameter of the hole  22 , the cylinder  41  can be arranged in the hole  22  and held in position in the hole  22  by friction between the walls  27  of the hole  22  and the cylinder  41 . 
     In one embodiment, the locking surface  45  of the cylinder  41  comprises one or more ridges  46  as disclosed in  FIGS. 7A-7E and 8A-8D . In one embodiment, as disclosed in  FIGS. 8A-D , the locking device  4  comprises a plurality of ridges  46  on the locking surface  45 . 
     In one embodiment, as disclosed in  FIGS. 8A-D , the first and second locking surfaces  45   a,    45   b  each comprises three ridges  46   a,    46   b,    46   c.  The ridges  46  concentrates the force exerted from the locking device  4  to the adjacent panel  3  to the edges of the ridges  46 . The force from the locking device  4  may be divided between the number of ridges  46 . If there are a low number of ridges  46  the force exerted by each ridge  46  is larger than if there are more ridges  46 . In one embodiment, the ridges are adapted to cut into the wall  27  of the hole  22 . In one embodiment, the ridges are adapted to cut into the adjacent panel  3  as disclosed in  FIG. 5B . And, in one embodiment, the ridges are adapted to cut into both the adjacent panel  3  and into the wall  27  of the hole  22 . 
     In one embodiment, the one or more ridges  46  extend around at least a part of a circumference of the locking surface  45 . In one embodiment, the ridges do not extend around the whole circumference of the locking surface  45 . In one embodiment, the ridges each extend in an arc circle of between 50°-180° of the circumference of the locking surface  45 . In one embodiment, the ridges extend around between 80°-120° of the circumference of the locking surface  45 . In one embodiment, the ridges extend around between 90°-100° of the circumference of the locking surface  45 . The ridges  46  have a height in the radial direction of the cylinder  41 . The height of the ridges  46  may be the distance/length that the ridges  46  extend in the radial direction. In one embodiment, the ridge  46  have a triangular shape with a top angle that is equal to or less than 90°, such that the ridge  46  has a sharp edge that is adapted to interact with (such as a frictional grip and/or penetration) the wall  27  of the hole  22 . 
     In one embodiment, the height of the respective ridges  46  varies along its extension. The height of the ridges  46  may vary along the circumference of the locking surface  45 . In one embodiment, the one or more ridges  46  has a non-helical shape. For example, the ridges  46  may only extend in a radial direction and in a circumferential direction of the cylinder. 
     In one embodiment, the locking surfaces  45   a,    45   b  of the cylinder  41  comprises at least one ridge  46 , such as a top ridge  46   a,  middle ridge  46   b,  and bottom ridge  46   c,  as is disclosed in  FIGS. 8A-D . In one embodiment, an edge of the ridge  46  has an inclined surface  48 . 
     The lever  42  has an inner end  42   a  and an outer end  42   b,  as disclosed in  FIGS. 7A-7E, 11A-11E and 12B-12C . The lever  42  is connected to the cylinder  41 . The inner end  42   a  of the lever  42  is connected to the cylinder  41 . In one embodiment, the outer end  42   b  comprises a handle configured to be moved by a user. The handle and the cylinder may be moulded in one piece. 
     The lever  42  is configured to, when turned, turn the cylinder  41  about the axis A between a mounting position, lever at 0° as disclosed in  FIGS. 9A-9D , and a locking position, as disclosed in  FIGS. 10A-10C  at 90°. In one embodiment, the locking device  4  is configured to be moved between the mounting position and the locking position by turning the lever  42  and the cylinder  41  +/−90°.  FIG. 5B  shows the locking device  4  rotated −90° to a first locking position and  FIG. 5C  shows the locking device rotated +90° to a second locking position. Thus the locking device may be rotated in a first direction to a first locking position and rotated in a second in a second opposite direction to a second locking position. 
     In the mounting position, shown in  FIGS. 9A-9D , the first edge  31  of the adjacent panel  3  is free to be arranged in the groove  21  of the panel  2 . The first edge  31  of the adjacent panel  3  is arranged in the groove  21  by moving the adjacent panel  3  toward the panel  2 , as shown by the arrow in  FIG. 1 , and inserting the first edge  31  into the groove  21 . In one embodiment, the cylinder  41  does not extend through the opening  23  into the groove  21  in the mounting position. In one embodiment, the cylinder  41  may slightly extend through the opening  23  into the groove  21  in the mounting position; however, in the locking position, the cylinder  41  extends further into the groove  21 . 
     In one embodiment, the locking device  4  is configured such that the lever  42  extends, in the mounting position, in an essentially perpendicular direction or within the range of about 90° from the adjacent panel  3 , as disclosed in  FIG. 9C . 
     Referring again to  FIGS. 5A-5B, 7A-7E and 8A-8C , there is shown an exemplary embodiment of the locking device  4 . The locking device  4  comprises the cylinder  41  and the lever  42  connected to the cylinder  41 . The cylinder  41  is configured to be arranged in the hole  22  in the panel  2 . The cylinder is configured to be displaceable in the hole  22  between a first mounting position and a second locking position by means of rotation of the cylinder, as was shown in  FIGS. 2A-2B and 3A-3B . The locking device  4  may in any embodiment of the disclosure be essentially symmetrical or symmetrical. This feature facilitates that the locking device may lock the adjacent panel  3  and the panel  2  by means of any of a clockwise or counter-clockwise rotation, as shown in  FIGS. 2A-2B  and  FIGS. 3A-4B  respectively. 
     The cylinder  41  comprises the essentially planar surface  47  configured to be arranged adjacent and/or facing and/or in abutment with the opening  23  in the mounting position shown for instance in  FIG. 5A . 
     A plane S of the cylinder  41  and preferably the locking device  4  which is orthogonal the planar surface  47  and the bottom base  44  may constitute a centre plane of the cylinder  41 . The plane S may be a symmetry plane of the cylinder  41  and/or the locking device  4 . Thus, the locking device  4  may in some embodiments comprise a plane of symmetry S as shown in  FIGS. 7A-7E . 
     The bottom base  44  may be configured to be oriented parallel the panel  2 , the planar surface  47  parallel the adjacent panel  3  and the plane S orthogonal the panel  2  and the adjacent panel  3  in the mounting position. 
     The cylinder  41  comprises the first locking surface  45   a  on a first side of the plane S and the second locking surface  45   b  on an opposite second side, as shown in  FIGS. 7D-7E . 
     The locking surfaces  45   a,    45   b  may each comprise the ridges  46 , such as at least two ridges, three ridges, four ridges, five ridges or six ridges. The ridges  46  are protruding in a radial direction from each of the first and second locking surface  45   a,    45   b.  The ridges  46  may project in a direction parallel the planar surface  47 . The ridges  46  may preferably include respective ridges  46   a,    46   b,    46   c  on each of the locking surfaces  45   a  and  45   b  as shown in  FIGS. 8A-8B . 
     As shown in  FIG. 8C , the ridges  46   a,    46   b,    46   c  may be provided on a distal ⅔ portion of the cylinder  41 , wherein by distal is meant towards the bottom base  44 . In other words, the ridges  46  may be provided on a portion of the cylinder  41  extending from the bottom base  44  and up to ⅔ of the distance between the bottom base  44  and the top base  43 . 
     The ridges  46  may preferably protrude from the cylinder in a direction transverse the longitudinal axis X of the cylinder  41 , i.e. in a radial direction as has been explained here, such as along respective planes parallel the plane of the bottom base  43 . The ridges  46  may extend in a respective single plane and/or be non-helical. 
     As mentioned, one or more of the ridges  46  may preferably extend discontinuously along the circumference of the cylinder  41 , as shown for example in  FIGS. 7C and 8A . 
     One or more, preferably none of the ridges  46  extend along the whole circumference of the cylinder  41 , thus the ridges  46  may comprise a front end adjacent the planar surface  47  where its radial projection is at a minimum and an opposite back end in a direction along the circumference of the cylinder  41  where its radial projection is at a minimum. 
     At least two of the ridges  46   a,    46   b,    46   c  may extend along the circumference of the cylinder  41  in different arc circles of the cylinder  41 . 
     For example, in any embodiment one or more of the ridges  46  may extend directly contiguous with said planar surface  47 , such as ridge  46   c  in  FIG. 8C . Ridge  46   c  may be a lowermost ridge adjacent the bottom base  44 . 
     For example, in any embodiment, one or more of the ridges  46  may be separated the planar surface  47  along a circumference of the cylinder  41 , such as ridges  46   a,    46   b  shown in  FIG. 8C . As derivable from  FIG. 8C , one or more of the ridges, such as proximal ridges  46   a,    46   b  may essentially not protrude from the cylinder  41  immediately adjacent the planar surface  47  and thus be separated the planar surface  47  along a circumference of the cylinder  41 . 
     By configuring at least two of the ridges  46   a,    46   b,    46   c  to extend in different arc circles, the timing by which the at least two ridges engage with the adjacent panel  3  may be configured such that the cylinder  41 , including the ridges, gradually or sequentially engage with the adjacent panel  3 . Thereby it may be facilitated that the locking device  4  including the cylinder  41  is easier to rotate, such that easy installation is facilitated. 
     The lever  42  extends from an inner end  42   a  to an outer end  42   b  in a direction substantially transverse the planar surface  47 . 
     The plane S may preferably be configured to be arranged substantially orthogonal the adjacent panel  3  and the panel  2  in the mounting position, as shown in  FIG. 9C . 
     The cylinder  41  may comprise at least one cross-section parallel the planar surface  47  being configured to lock the first edge  31  of the adjacent panel  3  in the groove  21  by means of any of a clockwise rotation of the cylinder  41  and a counter-clockwise rotation of the cylinder  41  initiated in the mounting position. 
     Referring to  FIG. 8C , the ridge  46   c  provided adjacent the bottom base  44  constitutes a distal ridge, i.e. typically furthest away from the user during installation and arranged furthest into to the hole  22 . Accordingly, the ridges  46   a  and  46   b  constitute proximal ridges. 
     In any embodiment, the distal ridge  46   c  may be configured to displace the adjacent panel  3  in response to rotation of the cylinder  41  from the mounting position to the locking position. In any embodiment, the proximal ridges  46   a,    46   b  may be configured to cut into the material of the inner wall  27  of the hole  22  in response to rotation of the cylinder  41  from the mounting position to the locking position. 
     As shown in  FIG. 8C , a dimension y 2  between individual proximal ridges  46   a,    46   b  may be different from the dimension between the distal ridge  46   c  and a neighbouring proximal ridge  46   b.  The first dimension y 1  may be measured between an outermost point, in the radial direction, of the distal ridge  46   c  adjacent the bottom base  44  and a neighbouring proximal ridge  46   b,  such as a middle ridge. The second dimension y 2  may be measured between the two adjacent proximal ridges  46   a,    46   b  provided above the bottom ridge  46   c.  The said dimensions y 1 , y 2  may be measured along the centre axis X of the cylinder. 
     The panel  2  is typically stronger closer to the bottom of the hole  22  than closer to the opening of the hole  22 . Stronger may entail that the material of the panel is less susceptible to crumbling and/or holds together compared to material closer to the surface of the panel. For example, the material of the panel, which may comprise wood particles, may be more prone to crumble close to the opening in response to an applied force, such as from a ridge. It may thus be desirable to provide a locking device that primarily achieves a locking function by engaging with the panel  2  close to the bottom of the hole  22  and/or adjacent the bottom base  44  of the locking device  4 . By providing a dimension y 2  between individual proximal ridges  46   a,    46   b  which is smaller than the dimension between the distal ridge  46   c  and a neighbouring proximal ridge  46   b,  it may thus be facilitated that crumbling of the panel material is avoided or at least to some extend reduced. 
     The volume of the distal ridge  46   c  may preferably be greater than the volume of one or more of the distal ridges  46   a,    46   b.  By this configuration, each of the proximal ridges  46   a,    46   b  will supplant less material of the panel than the distal ridge  46   c  when the cylinder  41  is rotated from the mounting position to the locking position. This configuration may bring about the technical advantage that crumbling of the panel  2  may be avoided or at least to some extent reduced. 
     This configuration may bring about the technical advantage that a strong locking function is facilitated at a position in the hole  22  in closer proximity of the bottom of the hole  22  than of the opening. 
       FIG. 8D  shows a principal cross-section view of the cylinder  41  according to an exemplary embodiment. A first width D 1  is measured parallel the planar surface  47  between the outermost points of the ridges  46 , in a radial direction. D 1  may be equal dL. A second width D 2  is measured transverse the planar surface  47  and transverse the first width D 1 , i.e. between the planar surface  47  and the opposite circumference of the cylinder  41 . 
     The first width D 1  is preferably greater than the second width D 2 . The first width D 1  is preferably greater than the distance between the opening  23  and the opposite interior wall  27  of the hole  22  and extends by a distance h into the groove  21 . 
     As derivable from  FIG. 8D , the cylinder, excluding the planar surface and the ridges, may have a circular cross section and an elliptical cross section including the ridges. The diameter D 1 /dL is measured at the largest diameter of the elliptical cross-section of the cylinder including the ridges  46 . The diameter D 2  is measured as the smallest diameter of the cylinder where there are no ridges. 
     At least a portion of an innermost outer circumferential surface of the cylinder  41  extending from the planar surface  47 , or between planar surfaces, may comprise the constant radius R 1 , which is preferably an inner radius, as shown in  FIG. 8D . The planar surface  47  and the radius R 1  forms a D-shaped cross-section. 
     It has been contemplated that the cylinder  41  may comprise a second planar surface (not shown) parallel and opposite the planar surface  47 . In this embodiment the planar surfaces and the radius R 1  forms a double-D shaped cross section. Likewise, the adjacent panel  3  and the hole  22  may form a D-shaped cross-section. 
     Referring again to  FIG. 8D , the cylinder comprises the first width D 1  and the second width D 2  in a plane transverse a longitudinal centre axis X of the cylinder. The first width D 1  being parallel the planar surface  47  and a second width being D 2  being transverse the planar surface. The first width D 1  may be an outer diameter measured between the outermost edges of the ridges  46 . 
       FIGS. 5B and 5C  show that the first width D 1  may be configured to be at a locking angle  80  to the first edge  31  in the locking position, wherein the locking angle  80  may be about 90°. 
     Thereby, it is facilitated that the locking device is configured such that, the extension of the cylinder  41  in a direction transverse the opening  23  is increased in response to rotation of the cylinder initiated in said mounting position. 
     The locking device  4  is configured to obtain said mounting position by means of arranging said planar surface facing said adjacent panel  3 . 
     The locking device  4  is configured to obtain said mounting position by means of displacement of the cylinder  41  along its longitudinal axis X into said hole  22 . 
     The planar surface  47  may form a vertical plane VP with the adjacent panel  3  in the mounting position as shown in  FIG. 9D . 
     A portion of said planar surface  47  may be provided in the ridge  46   c,  which may be a lowermost ridge as shown in  FIG. 8C . 
     The cylinder  41  may be configured such that, the extension of the cylinder in a direction transverse the opening  23  is increased in response to rotation of the cylinder  41  in any direction initiated in said mounting position. 
     In the locking position at least a portion of the first or second locking surface  45   a,    45   b  of the locking surface  45  of the locking device  4  extend into the groove  21  through the opening  23  and lock the adjacent panel  3  in the groove  21 , as disclosed in  FIGS. 5A-5B . In the locking position the adjacent panel  3  is locked against the panel  2 . In one embodiment, the locking device  4  is arranged to, in the locking position, lock the adjacent panel  3  to the panel  2  by pressing it against the wall  24  of the groove  21 . A portion of the first locking surface  45   a  or the second locking surface  45   b  that extend into the groove  21  engage the adjacent panel  3  and press it against the wall  24  of the groove  21 . The locking surface  45   a    45   b  extends through the opening  23  with a length hP, as disclosed in  FIGS. 5A-5B . In one embodiment, the portion of the locking surface  45   a,    45   b  extend, in the locking position, through the opening  23  into the groove  21  with a length hP that is 5-25% of the largest diameter dL of the cylinder  41 . In one embodiment, the portion of the locking surface  45   a,    45   b  extend, in the locking position, through the opening  23  into the groove  21  with a length hP that is 10-15% of the largest diameter dL of the cylinder  41 . 
     In one embodiment, the radial direction of the cylinder that the portion of the locking surface  45   a,    45   b  that extends into the groove  21  in the locking position substantially corresponds to the height h of the circular segment  25 . The direction of the height h of the circular segment  25  may be the same as the direction of the length hP of the portion of the locking surface  45   a,    45   b.    
     In one embodiment, the outer end  42   b  of the lever  42  is, in the locking position, arranged adjacent with the adjacent panel  3 . In one embodiment, the outer end  42   b  of the lever  42  is, in the locking position, arranged in contact with the adjacent panel  3 . The lever  42  may comprise a first locking surface  42   ba  and a second locking surface  42   bb,  for example on the outer end  42   b  of the lever  42 . The first and second locking surfaces are configured such that they abut the adjacent panel  3  in the first and second locking positions respectively such that the locking device is stopped during rotation at a position where the ridges cut in the adjacent panel  3 . 
     In one embodiment, the length of the portion of the first or second locking surface  45   a,    45   b  of the locking surface  45  that extend into the groove  21  through the opening  23  is configured to gradually increase when the locking device  4  is moved from the mounting position to the locking position. As the lever  42  is moved from the mounting position towards the locking position the size of the said portion of the locking surface  45   a,    45   b  that extends through the opening  23  increases gradually such that the force exerted from the locking device  4  on the adjacent panel  3  is also increased gradually. This gives a user of the locking device  4  tactile feedback of that the adjacent panel  3  is tighter and tighter locked in the groove  21 . 
     In one embodiment, at least one ridge  46  is, in the locking position, configured to be arranged at least partly in the second hole  32 , as disclosed in  FIG. 10C . The ridge  46  in the second hole  32  will act as a further lock the adjacent panel  3  in the groove  21 . 
     In one embodiment, the ridges are adapted to cut into the wall  27  of the hole  22 , and/or the adjacent panel  3  when the locking device is moved from the mounting position towards the locking position. As the locking device  4  is turned the ridges will exert a force against the adjacent panel  3  and the wall  24  of the hole  22 . If the force exceeds a value, depending on the material of the locking device  4 , the adjacent panel  3  and the wall  27 , the ridges  46  of the locking device  4  will cut into one or both of the wall  27  and the adjacent panel  3 . 
     In one embodiment, the adjacent panel  3  comprises further edges that are configured to be locked against further panels  2 . 
     In one embodiment, the panel comprises two or more holes  22  at the groove  21  and a corresponding number of locking devices  4  configured to be arranged in each hole  22 . In one embodiment, the panel comprises two or more grooves  21 . 
     In one embodiment, the panel  2  and the adjacent panel  3  is one of a bottom piece of a drawer, a frame and a back piece of a furniture product. 
     Hereafter a method for assembly and disassembly of the set of panels  1  according to the above will be described with reference to  FIGS. 9A-9D and 10A-10D . 
     When a user should assembly the set of panels  1  the following step is performed. The cylinder  41  of the locking device  4  is inserted into the hole  22  of the panel  2 . 
     The first edge  31  of the adjacent panel  3  is inserted into the groove  21  of the panel  2 . 
     Thereafter, the lever  42  is turned to position the locking device  4  in the locking position. 
     When the first edge  31  of the adjacent panel  3  is positioned in the groove  21  the lever  42  is turned in a first locking direction, as disclosed by the arrow in  FIG. 2A , or in a second locking direction as disclosed by the arrow in  FIG. 3A  to move the locking device  4  from the mounting position to the locking position to lock the first edge  31  of the adjacent panel  3  in the groove  21 . 
     In one embodiment, the edge  31  of the adjacent panel  3  is inserted into the groove  21  of the panel  2  before the locking device  4  is arranged in the hole  22 . Thereafter the locking device  4  is inserted into the hole  22  with the locking device positioned in the mounting position in relation to the adjacent panel  3  and the panel  2 . Thus, the above described steps do not have to be performed in a specific order to lock the adjacent panel  3  to the panel  2 . 
     In one embodiment, the locking device  4  is inserted into the hole  22  in a factory by another user or by a machine. Thus, the steps of the method could be divided to be performed by different users or by a machine. 
     In one embodiment, the set of panels  1  are one of a bottom piece of a drawer, a frame, a back piece of a furniture product and a panel for reinforcing an edge. 
     Referring in particular to  FIGS. 6B, 9B and 10B , in one embodiment, the method for assembly of a set of panels in accordance to the above comprises: inserting the first edge  31  of the adjacent panel  3  into the groove  21  of the panel  2 ; inserting the cylinder  41  of a first of said locking device  4  into a first of said hole  22  of the panel  2  to a mounting position; turning the lever  42  of the first of said locking device  4  in a first locking direction, such as a clockwise direction, to move the locking device  4  from the mounting position to a locking position to lock the first edge  31  of the adjacent panel  3  in the groove  21 ; inserting a the cylinder  41  of a second of said locking device  4 ′ into a second of said hole  22 ′ of the panel  2  or a groove of a further panel (not shown) to a mounting position; turning the lever  42  of the second of said locking device  4 ′ in a second locking direction being opposite the first locking direction, such as a counter-clockwise direction, to move the second of said locking device  4 ′ from the mounting position to a locking position to lock the first edge  31  of the adjacent panel  3  in the groove  21  of the panel  2  or the further panel. Preferably the respective levers of the first and the second of said locking device extend and/or point in opposite directions in the locking position. 
     This configuration facilitates the advantage that first and the second of said locking device  4 ,  4 ′ are configured to obtain an interlocking configuration; should the adjacent panel  3  be displaced, such as incrementally displaced, such as in a direction from the second of said locking device  4 ′ towards the first of said locking device  4 , the second of said locking device will be urged to rotate in its locking direction (cc in  FIG. 9B ) under the action of the displacement of the adjacent panel, whereby the second locking surface  42   bb  of the second of said locking device  4 ′ may engage and/or press against the adjacent panel  3  and stop the second of said locking device  4 ′ in the locking position and hence secure the locking function of the second of said locking device  4 ′. 
     Accordingly, should the adjacent panel  3  be displaced, such as incrementally displaced, such as in a direction from the first of said locking device  4  towards the second of said locking device  4 ′, the first of said locking device  4  will be urged to rotate in its locking direction (c in  FIG. 9B ) under the action of the displacement of the adjacent panel  3 , whereby the second first locking surface  45   ba  of the first of said locking device  4  may engage and/or press against the adjacent panel  3  and stop the first of said locking device  4  in the locking position and hence secure the locking function of the first of said locking device  4 . 
     After the set of panels  1  are assembled and the user, or another user, would like to disassembly the set of panels  1  the following steps are performed. Turning the lever  42  in a first unlocking direction being opposite the first locking direction or a second unlocking direction being opposite the second locking direction respectively, as disclosed by the arrow in  FIGS. 2B and 3B , to move the locking device  4  from the locking position to the mounting position to unlock the first edge  31  of the adjacent panel  3  in the groove  21 . When the lever  42  is moved back to the mounting position the cylinder  41  will turn together with it. As the cylinder  41  turns towards the mounting position the length of the portion of the first or second locking surface  45   a,    45   b  respectively that extend through the opening  23  decreases and the force exerted by the locking device  4  on the adjacent panel  3  is thus also decreased. In any embodiment, typically said portion of the first or second locking surface  45   a,    45   b  mainly or exclusively comprises ridges  46 . Thereafter, the first edge  31  of the adjacent panel  3  is removed from the groove  21  of the panel  2  and the set of panels  1  is disassembled. 
     In one embodiment, the above steps are repeated and the set of panels  1  is assembled again. In one embodiment, the panel  2  and/or the adjacent panel  3  is locked to another adjacent panel  3  and/or panel  2 . 
     In one embodiment, the panel  2  comprises a groove  21  which comprises a width W which may be equal to or greater than the width T of the adjacent panel  3 . The largest diameter dL of the locking device  4  may be larger than the width T of the adjacent panel  3 . The smallest diameter of the locking device  4  may be larger than the width T of the adjacent panel  3 . The width T of the adjacent panel  3  may be in the range of about 2 mm to about 10 mm or in the range of about 2 mm to about 5 mm. 
     In one embodiment, the edge  31  of the adjacent panel  3  and the locking device  4  are configured to be arranged in the groove  21  and the locking device  4  is turned in the groove  21  between the mounting position and the locking position. 
       FIGS. 12B-12C  each show an embodiment of the locking device  4  which is configured to lock the first edge of the adjacent panel  3  in the groove  21  of the panel  2 . The locking device  4  comprises a cylinder  41  and a lever  42  connected to the cylinder  41 , wherein the cylinder  41  is configured to be arranged in the hole  22  in the panel  2 , wherein the cylinder is configured to be displaceable in said hole  22  between a mounting position and a locking position by means of rotation cc of said cylinder. The cylinder  41  comprises a locking surface  45   b  configured to engage with the adjacent panel by means of a rotation of said cylinder  41  for locking the adjacent panel to the panel. The cylinder  41  comprises a mounting surface  47  configured to be arranged in said mounting position adjacent and/or facing the opening between the groove and the hole. 
     The mounting surface  47  may be an essentially planar surface. 
     The cylinder comprises a first width D 1  and a second width D 2  in a plane transverse a longitudinal centre axis of the cylinder, wherein the first width D 1  being parallel the mounting surface  47  and a second width D 2  transverse the mounting surface  47 . The first width D 1  is greater than the second width D 2  and the second width D 2  is configured to be perpendicular to the first edge  31  in the mounting position. 
     The first width D 1  may be configured to be at a locking angle  80  to the first edge  31  in the locking position, wherein the locking angle  80  may be within the range of about 80° to about 100° or about 85° to about  105 , or about 90°. 
     The locking surface  45   b  may be configured to engage with the adjacent panel  3  by means of a counter-clockwise rotation cc of the cylinder  41  for the locking of the adjacent panel  3  to the panel  2 . 
     The locking angle  80  may be within the range of about 80° to about 89° or about 82° to about 87°, or about 85° for the counter-clockwise rotation cc of the cylinder  41 . 
     The cylinder  41  may comprise, opposite the locking surface  45   b,  an opposite locking surface  45   a  configured to engage with the adjacent panel  3  by means of a clockwise rotation c of said cylinder  4  for locking the adjacent panel  3  to the panel  2 . 
     The locking angle  80  may be within the range of about 91° to about 100° or about 93° to about 97°, or about 95° for the clockwise rotation c of the cylinder  41 . 
     A longitudinal direction L of the lever  42  may be perpendicular to the mounting surface  47 . 
     The locking device  4  may be configured to be rotated past a position in which the first width D 1  is perpendicular to the first edge  31  and to the locking position. The lever  42  comprises a lever locking surface  42   ba,  preferably on the outer end  42   b  of the lever  42 , wherein the lever locking surface is configured to cooperate with the adjacent panel  3  in the locking position. An advantage with this embodiment may be that the lever locking surface counteracts rotation in one direction and the position of the first width D 1  counteracts rotation in the opposite direction. 
     The lever locking surface  42   ba  may be configured to cooperate with the adjacent panel  3  in the locking position by means of a counter-clockwise rotation cc of the cylinder  41 . 
     The lever  42  may comprise, opposite the lever locking surface  42   bb,  preferably on the outer end  42   b  of the lever  42 , an opposite lever locking surface  42   ba.  The opposite lever locking surface may be configured to cooperate with the adjacent panel  3  in the locking position. 
     The opposite lever locking surface  42   bb  may be configured to cooperate with the adjacent panel  3  in the locking position by means of a clockwise rotation c of the cylinder  41 . 
     The first width D 1  may be the largest diameter dL of the cylinder  4 . 
     The lever  42  may be handle configured to be moved by a user. 
     The handle and the cylinder  41  may be moulded in one piece. 
     The embodiment of the locking device in  FIG. 12B  comprises an embodiment of the lever  42  which comprises a first thickness t 1  at an inner end  42   a  and a second thickness t 2  at an outer end  42   b,  wherein the first thickness is greater than the second thickness. An advantage may be an increased strength of the lever. The lever may be essentially wedge shaped. This embodiment of the locking device is shown in more detail in  FIGS. 11A-11E . 
       FIG. 12A  shows an embodiment which comprises two of the embodiment of the locking device  4  shown in  FIG. 12B  for locking the first edge of the adjacent panel  3  in the groove of the panel  2 . This embodiment of the locking device  4  may be symmetric such that the locking device may be locked by rotating the locking device  4  clockwise c or counter-clockwise cc. 
     The embodiment of the locking device in  FIG. 12C  comprises an embodiment of the lever  42  which comprises a first thickness t 3  at an inner end  42   a  and a second thickness t 4  at an outer end  42   b,  wherein the first thickness is essentially the same as the second thickness. The lever may be essentially rectangular shaped. 
     In one embodiment, the set of panels are resilient panels. The resilient panels may comprise a core comprising thermoplastic material. The thermoplastic material may be foamed. 
     The thermoplastic material may comprise 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 several layers. 
     The aspects described above may comprise a decorative layer, such as a decorative foil comprising a thermoplastic material. The thermoplastic material of the decorative layer may be or comprise 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 decorative foil is preferably printed, for example by direct printing, rotogravure, or digital printing. In one embodiment, the decorative layer comprise melamine, a high pressure laminate (HPL) or a veneer. 
     The aspects described above may comprise a wear layer such as a film or foil. The wear layer may comprise 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. 
     The aspects described above may comprise panels comprising a wood base core, such as HDF, MDF, plywood, particleboard, OSB or masonite. 
     Further embodiments of the invention are described below: 
     1. A set, preferably for a furniture product, comprising a panel  2 , an adjacent panel  3  and a locking device  4 , wherein the panel  2  comprises a groove  21  and at least one hole  22  connected to the groove  21  via an opening  23 , 
     wherein the adjacent panel  3  comprises a first edge  31  that is configured to be arranged in the groove  21  of the panel  2 , wherein the locking device  4  is configured to lock the first edge  31  of the adjacent panel  3  in the groove  21  of the panel  2 , wherein the locking device  4  comprises a cylinder  41  and a lever  42  connected to the cylinder  41 , wherein the cylinder  41  is configured to be arranged in the hole  22  in the panel  2 , and wherein the cylinder is configured to be displaceable in said hole  22  between a first mounting position and a second locking position by means of rotation of said cylinder. 
     2. The set according to embodiment 1, wherein the cylinder  41  comprises a first locking surface  45   a  configured to engage with the adjacent panel by means of a clockwise rotation of said cylinder  4  for locking the adjacent panel to the panel. 
     3. The set according to embodiment 1 or 2, wherein the cylinder  41  comprises a second locking surface  45   b  configured to engage with said adjacent panel  3  by means of a counter-clockwise rotation of said cylinder  4  for locking the adjacent panel to the panel. 
     4. The set according to any of embodiments 1 to 3, wherein the locking device  4  comprises a plane S, preferably being a plane of symmetry, wherein the first locking surface  45   a  is provided on a first side of said plane S and the second locking surface  45   b  is provided on an opposite second side of said plane S. 
     5. The set according to any of embodiments 1 to 5, wherein the cylinder comprises an essentially planar surface  47  configured to be arranged adjacent and/or facing the opening  23  in said first mounting position, preferably said planar surface  47  is orthogonal the plane S and a bottom base  44  of the locking device, and preferably a longitudinal direction of the lever ( 42 ) is perpendicular to the essentially planar surface ( 47 ). 
     6. The set according to any one of the preceding embodiments 1 to 5, wherein each locking surface  45   a,    45   b  comprises at least two ridges  46  protruding in a radial direction from the cylinder  41 . 
     7. The set according to any one of the preceding embodiments 1 to 6, wherein the lever  42  extends from an inner end  42   a  to an outer end  42   b  in a direction substantially transverse the planar surface  47 . 
     8. The set according to any one of the preceding embodiments 3 to 7, wherein the plane S is configured to be arranged substantially orthogonal the adjacent panel  3  and the panel  2  in the mounting position. 
     9. The set according to any one of embodiments 4 to 8, wherein the plane S is a centre plane of the locking device  4 . 
     10. The set according any one of the preceding embodiments 4 to 9, wherein the plane S is orthogonal the planar surface  47  and a bottom base  44  of the cylinder  41 . 
     11. The set according to any one of the preceding embodiments 1 to 10, wherein the cylinder  41  comprises at least one cross-section portion parallel the planar surface  47  being configured to lock the first edge  31  of the adjacent panel  3  in the groove  21  by means of any of a clockwise rotation of the cylinder  41  and a counter-clockwise rotation of the cylinder  41  initiated in the mounting position. 
     12. The set according to any one of the preceding embodiments 1 to 11, wherein the hole  22  and the first edge  31  forms a D-shape when the first edge  31  is configured in said groove  21 . 
     13. The set according to any one of the preceding embodiments 1 to 12, wherein the cylinder comprises a first width D 1  and a second width D 2  in a plane transverse a longitudinal centre axis X of the cylinder, the first width D 1  being parallel the planar surface and a second width D 2  transverse the planar surface  47 . 
     14. The set according to the preceding embodiment 13, wherein the first width of the cylinder D 1  is equal or less than the first width of the hole dH and exceeds a sum of the first width of the hole dH—height h of a circular segment  25  of hole  22  by which the hole  22  extends into the groove  21 . 
     15. The set according to any one of the preceding embodiments 6 to 14, wherein said ridges  46  extend discontinuously along a circumference of the cylinder  41 . 
     16. The set according to any one of the preceding embodiments 6 to 15, wherein said ridges  46  are essentially non-helical or non-helical. 
     17. The set according to any one of the preceding embodiments 6 to 16, wherein one or more of said ridges, preferably a most distal ridge  46   c,  extend directly contiguous with said planar surface  47  such that said planar surface  47  is at least partially formed in at least one of said ridges  46 . 
     18. The set according to any one of the preceding embodiments 6 to 17, wherein one or more of said ridges  46  are separated said planar surface  47  along a circumference of the cylinder  41  such that said planar surface  47  is not formed said ridges  46   a,    46   b.    
     19. The set according to any one of the preceding embodiments 1 to 18, wherein at least a portion of an inner circumferential surface of the cylinder  41  extending from the planar surface  47 , or between the planar surfaces, comprises a constant radius R 1 . 
     20. The set according to any one of the preceding embodiments 1 to 19, wherein the locking device  4  is configured to obtain said mounting position by means of arranging said planar surface facing said adjacent panel  3 . 
     21. The set according to any one of the preceding embodiments 1 to 20, wherein the locking device  4  is configured to obtain said mounting position by means of displacement of the cylinder  41  along its longitudinal axis X into said hole  22  while not rotating the cylinder  41 . 
     22. The set according to any one of the preceding embodiments 1 to 21, wherein the planar surface  47  and the circumference of the cylinder comprising a constant radius R 1  forms a single D cross-section. 
     23. The set according to any one of the preceding embodiments 1 to 22, wherein the planar surface  47  and the adjacent panel forms a vertical plane VP in the mounting position. 
     24. The set according to any one of the preceding embodiments 1 to 23, wherein said cylinder  41  is configured such that, the extension of the cylinder in a direction transverse the opening  23  is increased in response to rotation of the cylinder  41  initiated in said mounting position. 
     25. The set according to any one of the preceding embodiments 1 to 24, wherein the adjacent panel  3  and the hole  22 , such as an inner wall of the hole  22 , forms a D-shaped cross-section. 
     26. The set according to any one of the preceding embodiments 1 to 25, wherein a most distal and/or bottom ridge  46   c  comprises a greater volume than one or more proximal ridges  46   a,    46   b.    
     27. The set according to any one of the preceding embodiments 1 to 26, wherein a first distance y 1 , measured along a centre axis X of the cylinder  41 , between a most distal and/or bottom ridge  46   c  and a proximal neighbouring ridge  46   b  is smaller than a second distance y 2  between two proximal ridges  46   b,    46   c.    
     28. The set according to any one of the preceding embodiments 1 to 27, wherein portions of the cylinder  41  are non-eccentric or comprise a constant radius R 1 . 
     29. The set according to any one of the preceding embodiments 1 to 27, wherein the lever  42  comprises a first locking surface  42   ba  and a second locking surface  42   bb,  preferably on the outer end  42   b  of the lever  42 , wherein the first and second locking surfaces are configured such that it abuts the adjacent panel  3  in the first and second locking positions respectively, preferably such that the locking device is stopped during a rotation at a position where the ridges cut in deepest into the adjacent panel  3 . 
     30. Method for assembly of a set of panels, such as a set according to any one of claims  1  to  29 , the method comprising: inserting a first edge  31  of the adjacent panel  3  into a groove  21  of a panel  2 ; inserting a cylinder  41  of a first of said locking device  4  into a first of said hole  22  of the panel  2  to a mounting position; turning a lever  42  of the first of said locking device  4  in a first locking direction, such as a clockwise direction c, to move the locking device  4  from the mounting position to a locking position to lock the first edge  31  of the adjacent panel  3  in the groove  21 . 
     31. The method according to the previous embodiment 30, further comprising: inserting a the cylinder  41  of a second of said locking device  4 ′ into a second of said hole  22 ′ of the panel  2  or the further panel to a mounting position; turning the lever  42  of the second of said locking device  4 ′ in a second locking direction being opposite the first locking direction, such as a counter-clockwise direction cc, to move the second of said locking device  4 ′ from the mounting position to a locking position to lock the first edge  31  of the adjacent panel  3  in the groove  21  of the panel  2 . 
     32. The method according to the previous embodiment 31, wherein, in the locking position, the respective levers of the first and the second of said locking device  4 ,  4 ′ extend from the respective cylinders in opposite directions. 
     33. A set, preferably for a furniture product, comprising a panel  2 , an adjacent panel  3  and at least two locking devices  4 ,  4 ′, wherein the panel  2  comprises a groove  21  and at least two holes  22 ,  22 ′ connected to the groove  21  via respective openings  23 , wherein the adjacent panel  3  comprises a first edge  31  that is configured to be arranged in the groove  21  of the panel  2 , wherein each of the locking devices  4 ,  4 ′ is configured to lock the first edge  31  of the adjacent panel  3  in the groove  21  of the panel  2 , wherein each locking device  4 ,  4 ′ comprises a cylinder  41  and a lever  42  connected to the cylinder  41 , wherein the cylinders  41  of the respective locking devices  4 ,  4 ′ are configured to be arranged in the respective holes  22 ,  22 ′ in the panel  2 , wherein the cylinders are configured to be displaceable in said holes  22 ,  22  between a first mounting position and a second locking position by means of rotation of said cylinders, to lock the first edge  31  of the adjacent panel  3  in the groove  21  of the panel  2 , and wherein the locking devices  4 ,  4 ′ are configured such that the adjacent panel  3  is locked to the panel  2  by means of rotating the respective locking devices  4 ,  4 ′ in opposite directions or rotating one of the locking devices  4 , 4 ′ a positive rotation (counter-clockwise) and the other of the locking devices  4 ′ in a negative rotation (clockwise).