Patent ID: 7568322

Claim:
A method for providing a herringbone patterned flooring by a system of rectangular, mechanically joined floorboards, wherein neighbouring floorboards are adapted for being mechanically joined in a horizontal direction perpendicular to respective joint edges of the floorboards and parallel with a main plane of the floorboards; wherein the floorboards are adapted so that said joining is possible between two neighbouring short sides, between one of the short sides and a neighbouring long side, and between two neighbouring long sides; wherein said mechanical joining in said horizontal direction is provided by a first locking device provided at a first one of said neighbouring joint edges and comprising a locking groove and a second locking device provided at a second one of said neighbouring joint edges and comprising a portion protruding outside the vertical plane which is perpendicular to a main plain of the floorboard and defined by an upper joint edge, and supporting a locking element designed to interact with said locking groove; wherein the system comprises first and second types of floorboards, on which said first and second locking devices are arranged in pairs on opposing short edges and long edges, respectively, and wherein the locking device of the first type of floorboard along one pair of opposing joint edges is mirror inverted relative to the corresponding locking device along the same pair of opposing joint edges of the second type of floorboard, said method comprising joining the floorboards in different directions in the main plane of the floorboards by inwards angling, wherein a first row is formed by joining, long side against short side, floorboards of a third type, having two long edges and two short edges wherein a first one of its two short edges presents said first locking device and both its long edges and its other short edge presents said second locking device, wherein at least one second row is formed by joining, long side against short side, floorboards of said first type of floorboards and said second type of floorboards, said second row being joined to said first row, in a first installation direction relative to the first row, and wherein at least one third row is formed by joining, long side against short side, floorboards of said first type of floorboards and said second type of floorboards, said third row being joined to said first row in a second installation direction, opposite said first installation direction, such that each one of said floorboards forming part of said third row is rotated 180° relative to a respective corresponding floorboard forming part of said second row.