Patent ID: 9528276
Filing Date: 2016-12-27
CPC Classification: E04B,E04F

Claim Text:
1. A locking system for mechanical joining of floorboards, said locking system comprising: a tongue groove at a first joint edge and a tongue at a second joint edge, the tongue groove and tongue having cooperating upper abutment surfaces and cooperating lower abutment surfaces for vertical locking of two joint edges of two adjacent floorboards, said upper and lower abutment surfaces being essentially parallel with a principal plane of the floorboards; and for horizontal mechanical joining of the first and the second joint edges, a locking groove formed in an underside of the first joint edge and extending in parallel therewith, and a projecting portion projecting from the second joint edge, the projecting portion being made in one piece with a body of the floorboard, said projecting portion supporting, at a distance from the second joint edge, a locking element cooperating with the locking groove, wherein said tongue is anglable into the tongue groove, and wherein the locking element is insertable into the locking groove by mutual angular motion of the floorboards about the first and the second joint edges, wherein, in the joined state, the cooperating upper abutment surfaces are limited horizontally inwards from the joint edge and horizontally outwards to the joint edge by an inner vertical plane and an outer vertical plane, respectively; wherein the tongue groove and tongue are so designed that there is in the tongue groove, in the joined state, between the inner vertical plane and the outer vertical plane and below the tongue, a first space which extends horizontally from the inner vertical plane and at least halfway to the outer vertical plane; wherein the lower abutment surfaces are positioned essentially outside the outer vertical plane; wherein there is a second space, in a joined state, between an outer tip of a lower lip of the tongue groove and the projecting portion.