Covering panel with bevelled edges having varying cross-section, and apparatus and method of making the same

1. A panel for use in an assembly of panels attached to each other to form a covering, comprising, relative to an orthogonal coordinate system having X, Y and Z axes, an upper surface and a lower surface each having planar portions extending within a different main plane parallel to a X-Z plane the Y axis being orthogonal to the X-Z plane, and an edge-between the planar portions of the upper surface and the lower surface includes a coupling to couple the panel to a coupling of another panel, said edge and coupling extending parallel to the Z axis, wherein the upper surface includes a lowered part adjacent said edge of the panel, wherein a shape of the lowered part varies when viewed in cross-sections taken parallel to a X-Y plane at different positions along said one edge, wherein each cross-section is perpendicular to the Z axis.

2. The panel of claim 1 , wherein the shape of the lowered part varies in an irregular manner when viewed in cross-sections taken parallel to a X-Y plane at different positions along said one edge.

3. The panel of claim 1 , wherein the lowered part has an extreme edge which is intended to be positioned against an extreme edge of an adjacent panel, said extreme edge has a constant position within each cross-section.

4. The panel of claim 1 , wherein the lowered part has an inclined extent in order to form a V-groove between the panels.

5. The panel of claim 4 , wherein the V-groove has a lower section which has a regular shape along said edge and an upper section which has a varying cross-section, and wherein an angle of the lower section with respect to the planar portion of the upper surface is larger than an angle of the upper section with respect to the planar portion of the upper surface.

6. The panel of claim 1 , wherein the upper surface of the panel is provided with a surface decoration, whereas the lowered part is provided with a surface finishing.

7. The panel of claim 1 wherein another edge considered separately from the other edges of the plurality of edges, extends in a second direction, said another edge including a second coupling to couple the panel to a coupling of another panel, and wherein the upper surface includes a lowered part at said another edge of the panel in the second direction, wherein a shape of the lowered part between the upper surface and said one edge varies when viewed in cross-sections at different positions along said another edge, wherein each cross-section is perpendicular to the second direction.

8. A panel for use in an assembly of panels attached to each other to form a covering, comprising, relative to an orthogonal coordinate system having X, Y and Z axes, an upper surface and a lower surface each having planar portions extending within a different main plane parallel to a X-Z plane, and an edge between the planar portions of the upper surface and the lower surface comprising a coupling to couple the panel to a coupling of another panel, said edge and coupling extending to the parallel to the Z axis, wherein the upper surface includes a lowered part adjacent said edge of the panel, the lowered part intersecting the planar portion of the upper surface along a first line that extends generally in a direction as the Z axis, wherein the extent of the first line deviates from said edge.

9. The panel of claim 8 , wherein the first line is irregular along the intersection with the planar portion of the upper surface.

10. The panel of claim 8 , wherein a position of said edge in each cross-section of the lowered part parallel to a X-Y plane, perpendicular to said edge of the panel and the Z axis, is constant along said edge.

11. The panel of claim 8 , wherein the lowered part has an inclined extent in order to form a V-groove between the panels.

12. The panel of claim 11 , wherein the V-groove has a lower section along said edge, and wherein an angle of the lower section with respect to the planar portion of the upper surface is larger than an angle of the upper section with respect to the planar portion of the upper surface.

13. The panel of claim 8 , wherein the upper surface of the panel is provided with a surface decoration, whereas the lowered part is provided with a surface finishing.

14. A panel for use in an assembly of panels attached to each other to form a covering, comprising, relative to an orthogonal coordinate system having X,Y and Z axes, an upper surface and a lower surface each having planar portions extending within a different main plane parallel to a X-Z plane, the Y axis being orthogonal to the X-Y plane, wherein the upper surface is bounded by a plurality of edges extending along the upper surface and wherein one edge of the plurality of edges, considered separately from other edges of the plurality of edges extends parallel to the Z axis, said one edge including a coupling to couple the panel to a coupling of another panel, and wherein the upper surface includes a lowered part extending along said one edge of the panel parallel to the Z axis, wherein a shape of the lowered part between the planar portion of the upper surface and said one edge varies when viewed in cross-sections taken parallel to a X-Y plane at different positions along said one edge, wherein each cross-section is perpendicular to the Z axis.

15. An assembly comprising a plurality of panels, each panel being arranged to be coupled to other panels so as to form a covering, and each panel comprising, relative to an orthogonal coordinate system having X, Y and Z axes, an upper surface and a lower surface, the upper and lower surfaces each having planar portions extending within a different main plane parallel to a X-Z plane, the Y axis being orthogonal to the X-Z plane, and wherein the upper surface of each panel is bounded by a plurality of edges extending along the upper surface and wherein each edge of at least two opposed edges of the plurality of edges, considered separately from other edges of the plurality of edges extends parallel to the Z axis, each edge of said of at least two opposed edges including a coupling to couple the panel to another panel, and wherein the upper surface of each panel includes a lowered part extending along a corresponding edge of said at least two opposed edges of the panel parallel to the Z axis, wherein a shape of each lowered part between the planar portion of the corresponding upper surface and the corresponding edge varies when viewed in cross-sections taken parallel to a X-Y plane at different positions along the corresponding edge, wherein each cross-section is perpendicular to the Z axis.

16. The panel of claim 15 , wherein the shape of each lowered part varies in an irregular manner when viewed in cross-sections taken parallel to a X-Y plane at different positions along each corresponding edge of said at least two opposed edges.

17. The panel of claim 15 , wherein each lowered part has an extreme edge disposed between the upper surface and the lower surface of each corresponding panel, wherein each extreme edge is configured to be positioned against an extreme edge of the adjacent panel, and wherein each extreme edge has a constant position within each corresponding cross-section of each lowered part.

18. The panel of claim 15 , wherein each lowered part has an inclined extent in order to form a V-groove between the panels.

19. The panel of claim 18 , wherein each V-groove has a lower section along each edge of said at least two opposed edges of the panel and an upper section which has a varying cross-section along each edge of said at least two edges, and wherein an angle of each lower section with respect to the planar portion of the corresponding upper surface is larger than an angle of the corresponding upper section with respect to the planar portion of the corresponding upper surface.

20. The panel of claim 15 , wherein the upper surface of each panel is provided with a surface decoration, whereas the lowered part of each panel is provided with a surface finishing.