Patent ID: 7637068

Claim:
Floorboards for providing a floating flooring, where immediately juxtaposed upper parts of first and second neighboring joint edges of two joined floorboards together define a vertical plane which is perpendicular to the principal plane of the floorboards, a locking system for providing joining of the two joint edges in the vertical direction, said locking system comprising a strip groove formed in a second joint edge portion, the strip groove comprising an upper lip and a lower lip and a tongue on a first joint edge portion and, in the horizontal direction perpendicular to the vertical plane and parallel with the principal plane, a locking groove formed in the first joint edge portion and extending parallel to the first joint edge, and a separate strip which is integrated with the second joint edge and which has a projecting portion which is at a distance from the vertical plane and supports a locking element coacting with the locking groove, said projecting portion thus being located completely outside the vertical plane seen from the side of the second joint edge, wherein: the separate strip with its projecting portion is joined with a core of the floorboard using a mechanical joint which joins the separate strip with the floorboard in the horizontal direction and vertical direction, the separate strip is mechanically attached to the second joint edge portion, the separate strip comprises of a material comprising wood fibers, the floorboards have at least two sides which can be joined or released by an angular motion about the upper joint edge, wherein an undercut groove is formed in the upper lip of the strip groove and the separate strip interlocks with the undercut groove, and wherein the separate strip is made of HDF.