US Patent 10544818 Set of panels for an assembled product

A set of panels including a first panel with a first main plane and a second panel with a second main plane. A first edge of the first panel is configured to be locked to a second edge of the second panel, wherein the first main plane is essentially perpendicular to the second main plane, and wherein the first and the second edges are locked in a first direction, which is perpendicular to the first main plane, and a second direction, which is perpendicular to the second main plane. The first edge includes an edge tongue, with a longitudinal direction along the first edge, including a bottom edge, a first surface and an opposite second surface. The edge groove and/or the edge tongue is/are configured such that a greater force is absorbed by the longitudinal central part than by an edge part at third and fourth edges.