Patent ID: 8429869
Filing Date: 2013-04-30
Classification: E04B,E04F

Abstract:
1. A locking system for mechanical joining of rectangular floorboards having a body, long edges and short edges, the long edges being perpendicular to the short edges, the locking system comprising: a long edge tongue and a long edge tongue groove for vertical locking of two long joint edges of two adjacent floorboards, and a short edge tongue and a short edge tongue groove for vertical locking of two short joint edges of two adjacent floorboards, wherein each pair of the long edge tongue and tongue groove and the short edge tongue and tongue groove forms a tongue-and-groove joint, and at least one tongue-and-groove joint is configured so that there is in one of the grooves of the tongue-and-groove joints, in the joined state, a space below the tongue of the tongue-and-groove joint, for horizontal mechanical joining of the long and short joint edges, a long edge locking groove formed in the underside of a first long joint edge and a short edge locking groove formed in the underside of a first short joint edge, and a long edge portion projecting from a second long joint edge and a short edge portion projecting from a second short joint edge, each of the long and short edge projecting portions extending from the body of the floorboard and supporting, at a distance from respective joint edges, a locking element cooperating with a respective locking groove, wherein the short edge tongue is arranged on the second short joint edge, the long edge tongue is arranged on the first long joint edge, the short edge tongue groove is arranged on the first short edge, the long edge tongue groove is arranged on the second long joint edge, at least one pair of the long edge tongue and tongue groove and the short edge tongue and tongue groove has cooperating upper abutment surfaces and cooperating lower abutment surfaces for vertical locking of two joint edges of two adjacent floorboards, the upper and lower abutment surfaces being essentially parallel with the principal plane of the floorboards, in a joined state, the cooperating upper abutment surfaces are limited horizontally inwards from one of the joint edges and horizontally outwards to the one joint edge by an inner vertical plane and an outer vertical plane, respectively, and the lower abutment surfaces are positioned essentially outside the outer vertical plane.