Patent ID: 8511031

Claim:
A set of essentially identical floorboards each comprising a front face and a rear face extending in the horizontal plane, a core, and a surface layer, a mechanical locking system is arranged at least at two opposite edges for connecting a floorboard with an adjacent floorboard in a horizontal and a vertical direction, said mechanical locking system being configured for connecting the floorboard with the adjacent floorboard by vertical folding, the vertical folding being where a long side edge of a first floorboard is pressed against an upper part of a second long side edge of a second floorboard, and when the first floorboard is angled down a short side edge is folded down into a connection with a side edge of an adjacent, third floorboard, wherein one of said opposite edges is provided with a horizontally extending protrusion at an upper edge, and wherein said protrusion is configured to overlap a surface groove at an upper edge of the other of said opposite edges, such that two connected and adjacent floorboards have upper overlapping edges.