Patent ID: 7757453

Claim:
A floor panel, for forming a floor covering, said floor panel having a panel thickness in a range of 5 to 15 mm; said floor panel comprising a core material selected from the group consisting of medium density fiberboard and high density fiberboard; said floor panel at least at two opposite sides including side edges provided with coupling parts substantially formed as a tongue and a groove, said groove being bordered by an upper lip and a lower lip, wherein the coupling parts are configured to enable two of such panels to be coupled to each other; wherein said lower lip extends beyond said upper lip; wherein the coupling parts are provided with integrated mechanical locking elements which prevent drifting apart of two coupled floor panels in a direction perpendicular to the related edges and parallel to an underside of the coupled floor panels; wherein said locking elements comprise a recess in said lower lip and a protrusion at a lower side of said tongue, whereby in coupled condition of two of such panels the protrusion of one of said panels cooperates with the recess of the other panel; wherein said coupling parts and said locking elements are formed in one piece from said core material; wherein said locking elements comprise contact surfaces, defining a locking surface at a lower side of the tongue and a locking surface at an upper side of the lower lip, so that upon coupling two panels to each other, the respective locking surfaces cooperate with each other; wherein said coupling parts and said locking elements are configured so as to enable two of said panels to be joined by turning one panel into the other; and wherein at least adjacent one of the locking surfaces there is provided a rounding for facilitating engagement of said locking surfaces behind each other when coupling two of said floor panels; and wherein the coupling parts and locking elements are configured so as to enable coupling of two of such panels in a manner free from play.