Patent ID: 8341914

Claim:
A tongue for a building panel, said tongue is of an elongated shape, wherein the tongue comprises at least two horizontal protrusions that extend in the same direction at a first long edge of the tongue, the horizontal protrusions are bendable in a plane parallel to an upper surface of the tongue, extend essentially in the plane, and each has a distal tip, the tongue has a second long edge opposite the first long edge, which is essentially straight over substantially the whole length of the tongue, the tongue has a first width from the first long edge to the second long edge of the tongue, and has a second width from the second long edge of the tongue to the distal tip of each horizontal protrusion, and the second width is larger than the first width before bending of the horizontal protrusions, and a vertical protrusion is arranged at the upper side and/or at the lower side of the horizontal protrusions.