Patent ID: 8365494
Filing Date: 2013-02-05
Classification: B27F,B27M,E04B,E04F,F16B,Y10T

Abstract:
1. A coupling system for joining panels, which panels are rectangular, i.e. elongated or square, and which comprise a core, said core comprising a material selected from the group consisting of medium density fibreboard (MDF) and high density fibre board (HDF); said panels comprising a decorative side, a back side opposite from the decorative side, a first pair of opposite side edges and a second pair of opposite side edges; said coupling system comprising cooperating coupling parts provided at said first pair of opposite side edges enabling two of such panels to be coupled to each other in a common plane; wherein the coupling parts are substantially in the form of a tongue and a groove, said tongue and groove comprising integral extensions of said core material; said groove closest to said decorative side being bordered by a first lip having a distal end and said groove closest to said back side being bordered by a second lip, said second lip extending beyond said distal end of the first lip; wherein the coupling parts are provided with integrated second lip and tongue mechanical locking elements extending over full lengths of the first pair of opposite side edges, which when the panels are coupled to each other in a common plane prevent unrestrained drifting apart of two coupled panels in a direction perpendicular to the related side edges and parallel to the plane of the coupled panels; said second lip and tongue locking elements defining contact surfaces defined by a local protrusion on a side of the tongue facing towards the back side and a local recess in the upper side of the second lip facing towards the decorative side, and comprising second lip and tongue locking surfaces which in a coupled condition of two of such panels prevent unrestrained drifting apart of the panels in a common plane; said second lip locking surface being located beyond the distal end of said first lip; wherein the coupling parts and locking elements enable two of the panels to be joined by a relative turning movement of one panel relative to the other panel along adjacent edges being coupled; wherein at least at one of the locking elements there is provided a rounding adjacent at least one of said locking surfaces that facilitates engagement of said second lip and tongue locking surfaces behind each other when coupling two of said panels, said rounding also comprising said core material; and wherein, when the panels are coupled in a common plane a space is provided between an innermost area of the groove an a distal area of the tongue.