Mechanical locking system for floorboards

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,
• wherein the separate strip can be joined with the strip groove by a snap joint, and
• wherein snapping-in in the snap joint takes place by a change in shape of the strip groove.

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, wherein both floorboards are locked vertically in any vertical direction, said locking system comprising
• a strip groove formed in a second joint edge portion 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 extended parallel to the first joint edge, and
• a 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 tongue is made of a separate flexible material which has a different composition of materials or other material properties than the core of the floorboard, and
• the tongue is flexible so as to enable a change in shape of the tongue vertically or horizontally when the first and second floorboards are connected vertically, or so as to enable a displacement of the tongue horizontally when the first and second floorboards are connected vertically.