| 摘要 |
A locking system for mechanical joining of floorboards, in which immediately juxtaposed upper parts of taco adjacent joint edges of two joined floorboards together define a joint plane perpendicular to a principal plane of the floorboards, the locking system providing a joining of the two joint edges perpendicular to the joint plane, the locking system including a locking groove which is formed in an underside of and extends in parallel with a first of the two joint edges at a distance from the joint plane and a portion projecting from a lower part of a second of the two joint edges and below the first joint edge and integrated with a body of the board, the projecting portion supporting at a distance from the joint plane a locking element cooperating with the locking groove, the projecting portion being located entirely outside the joint plane seen from a side of the second joint edge, and the projecting portion having a material composition other than that of the body of the board, tie projecting portion includes at least two horizontally juxtaposed parts, which two parts differ from each other with respect to at least one of the material composition and a material property.
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