US Patent 8234834 Method for forming a floor

Floor element (1), which is mainly in the form of a board with triangular, quadratic, rectangular, rhomboidal or polygonal shape as seen from above. The floor element (1) is provided with edges (2), a lower side (7) and a decorative upper layer (3). The floor elements (1), which are intended to be joined via tongue and groove are on at least two opposite edges (2), preferably on all edges (2) provided with holes (4). The holes (4) extends inwards from the edge (2) mainly parallel to the decorative upper layer (3). The holes (4) are arranged on a predetermined distance from the decorative upper layer (3) and on a predetermined distance from a closest corner between two adjacent edges (2), whereby the holes (4) are intended to receive each one part of a guiding means (6).