Patent ID: 8596013
Filing Date: 2013-12-03
Classification: E04B,E04C,E04F

Abstract:
1. Building panels provided with a mechanical locking system comprising a tongue, at an edge of a first panel, cooperating with a tongue groove, at an edge of an adjacent second panel, for vertical locking of the building panels, wherein the edge of the first panel is provided with a displacement groove to obtain a resilient and displaceable tongue part, said displacement groove is downwardly open, and comprises an inner wall, an outer wall and an upper wall, wherein the tongue is formed out of the edge of the first panel, wherein the resilient and displaceable part of the tongue is configured to be displaced into the displacement groove by a lower lip of the tongue groove during assembling of the first and the second panel by a vertical displacement of the second panel toward the first panel, wherein the thickness of the outer wall of the displacement groove at a first and upper part of the displacement groove, at the upper surface of the tongue, is configured such that the outer wall at the first and upper part breaks during said assembling, and wherein the thickness of the outer wall of the displacement groove at a second part of the displacement groove, below the resilient and displaceable part of the tongue, is configured such that the outer wall at the second part breaks during said assembling.