Floor panels with edge connectors

1. A floor panel, for forming a floor covering,

said floor panel having a substantially planar upper side and a substantially planar underside, and a first and second pair of opposite side edges, including upper side edges adjacent the panel upper side;

said floor panel having a thickness measured between the substantially planar upper side and the substantially planar underside in the range of 5 to 15 mm;

said floor panel further comprising a core material selected from the group consisting of medium density fiberboard and high density fiberboard;

said floor panel at the first and second pairs of opposite side edges being provided with coupling parts substantially in the form of a tongue and a groove, wherein said coupling parts are configured so as to enable two of such panels to be coupled to each other by the tongue of one panel being received in the groove of the other panel with the respective upper side edges of the panels adjoining each other and wherein said groove at said first pair of side edges is bordered by an upper and lower lip;

said upper lip having an underside which in coupled condition of two of such panels cooperates with the tongue of the other panel;

said coupling parts being provided with integrated mechanical locking elements including locking surfaces which contact and cooperate with each other when two of such panels are coupled with the upper side edges adjoining each other to prevent the drifting apart of two coupled floor panels in a direction perpendicular to the related side edges and parallel to the underside of the coupled floor panels;

said coupling parts and said locking elements being formed in one piece in said core material;

wherein at least at the first pair of opposite side edges, said upper side edges, coupling parts and locking elements are configured such that coupling of a pair of panels at their respective side edges with the upper side edges adjoining is achievable by a turning movement wherein one panel by its side edge is angled-in to the side edge of the other panel until a tongue of one panel is fully received in a groove of the other panel with the locking surfaces in contact with each other and said upper side edges adjoining each other;

said locking surfaces of the coupling parts at least at said first pair of opposite side edges contacting each other when a pair of the panels are coupled by placement of the tongue of one panel into the groove of the other panel with the upper side edges of the panels adjoining each other, to thereby secure the upper side edges of said coupled panels in adjoined relationship while preventing unintentional separation between the upper side edges that would produce undesired gaps between the upper side edges in directions perpendicular to the related side edges and parallel to the underside of the coupled floor panels; and

wherein, at least at the first pair of opposite side edges, at the entrance of the groove of the coupling parts a chamfer is provided on said lower side of said upper lip;

said second pair of side edges including tongue and groove coupling parts comprising cooperating and complementary locking elements associated with the coupling parts, said locking elements upon coupling of a pair of the panels at said second pair of side edges engaging each other and securing the second pair of side edges against separation in a vertical direction perpendicular to the underside of the coupled panels upon coupling of two panels with the tongue of one panel received in the groove of the other panel and with the upper side edges of the second pair of side edges in adjoined relationship;

said locking elements when engaging each other with the upper side edges of the second pair of side edges adjoining each other securing the upper side edges of said coupled panels against unintentional separation between the upper side edges that would produce undesired gaps between the upper side edges in a horizontal direction perpendicular to the related side edges and parallel to the underside of the coupled floor panels.

2. The floor panel of claim 1 , wherein at least at said first pair of opposite side edges said lower lip of the coupling parts extends beyond said upper lip.

3. The floor panel of claim 2 , wherein at least at said first pair of opposite side edges, said locking elements of said coupling parts comprise a recess in said lower lip and a protrusion at the lower side of said tongue, said recess and said protrusion include said locking surfaces, which in coupled condition of two of such panels cooperate with each other; and

wherein the locking surface at said recess is located in a portion of said lower lip which is located beyond said upper lip.

4. The floor panel of claim 3 , wherein at least at said first pair of opposite side edges the configuration of said chamfer, said coupling parts and said locking elements is such that said chamfer facilitates joining of two panels during said turning of one panel into the other to couple a pair of panels.

5. The floor panel of claim 4 , wherein the difference in length with which the lower lip extends beyond the upper lip, measured in the plane of the floor panel, is smaller than the thickness of the floor panel.

6. The floor panel of claim 1 , wherein said floor panel is a laminated floor panel of the type comprising a resin impregnated imprinted decor layer.

7. The floor panel of claim 1 , wherein the floor panel comprises a monolithic core of said medium density fiberboard and high density fiberboard.