Floor panels with edge connectors

1. A floor panel for forming a floor covering, which panel is rectangular, i.e. elongated or square, and has an upper side, an underside, and at least two opposite side edges including upper side edges adjoining the upper side,

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

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

wherein said coupling parts are provided with integrated mechanical locking elements associated with the tongue and groove which prevent the drifting apart of two coupled floor panels in a direction perpendicular to the related edges and parallel to the underside of the coupled floor panels, the locking elements including locking surfaces that contact each other upon coupling of the panels;

wherein at least said tongue and the respective locking element associated with the tongue are formed in one piece in said core material;

said upper side edges, coupling parts and locking elements being configured such that said coupling of a pair of panels 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 such that uncoupling of the panels along one side edge of at least one pair of side edges is achievable by a reverse turning movement of one panel relative to the other about the respective side edge starting from a position where the upper side edges are in contact with each other; and

wherein in coupled condition of two of such panels a space exists underneath the tongue, said space extending from the distal end of the tongue in a proximal direction of the panel

wherein said locking surfaces contact 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 which would produce undesired gaps between the upper side edges in a 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 said coupling parts and said locking elements at said at least two opposite side edges are all formed in one piece in said core material.

3. The floor panel of claim 1 , wherein said floor panel has a limited panel thickness in the range of 5 to 15 mm.

4. The floor panel of claim 1 , wherein said lower lip extends beyond said upper lip.

5. The floor panel of claim 4 ,

wherein said locking elements comprise a recess in the upper side of said lower lip and a protrusion at the lower side of said tongue, said recess and said protrusion having locking surfaces which in coupled condition of two of such panels contact and cooperate with each other to prevent said drifting apart of coupled panels; and

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

6. The floor panel of claim 5 , wherein the recess has a bottom portion, the protrusion has a lower side and wherein in the coupled condition of two of such panels, the lower side of the protrusion is in contact with the bottom portion of the recess.

7. The floor panel of claim 6 , wherein the length by 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.

8. A floor covering, said floor covering comprising a plurality of hard floor panels,

said panels having an upper side, an underside, being rectangular, i.e. elongated or square, and having a first and a second pair of opposite side edges including upper side edges adjoining the upper side,

said floor panels having a thickness in the range of 5 to 15 mm;

of the type being laminated floor panels of the type having a core, a top layer on the upper side and a backing layer on the underside, said top layer comprising a maximum of three resin impregnated paper layers, amongst which there is at least one imprinted decorative layer;

said core monolithically extending between the top layer and the backing layer;

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

said coupling parts being provided with integrated mechanical locking elements associated with the tongue and groove which prevent the drifting apart of two coupled floor panels in a direction perpendicular to the related edges and parallel to the underside of the coupled floor panels and which define respective locking surfaces which in coupled condition of two such panels contact and cooperate with each other;

wherein said coupling parts and locking elements are formed in one piece in said core

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

wherein the locking surfaces at the first pair of side edges of the panels contact 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 which would produce undesired gaps between the upper side edges in a direction perpendicular to the related side edges and parallel to the underside of the coupled floor panels; and

wherein at the first pair of side edges both the coupling parts as well as the locking elements are located completely at a level below the top layer but above the backing layer.

9. The floor covering of claim 8 ,

wherein said groove has an innermost point, and the locking elements at said first pair of side edges comprise a recess in said lower lip and a protrusion at the lower side of said tongue, said recess and said protrusion having said locking surfaces; and

wherein, in coupled condition of a pair of panels with the locking surfaces in contact with each other, said locking surfaces define a common line of tangency where they contact each other, said line of tangency being obliquely inclined relative to the panel principal plane such that it extends from an upper point distally spaced from the innermost point of the groove part to a lower point closer to the innermost point of the groove part with respect to the upper point.

10. The floor covering of claim 9 ,

wherein at the first pair of side edges the groove is bordered by a lower lip which has a distal end and extends beyond the upper lip;

wherein the upper lip at the first pair of side edges has a lower side and the corresponding tongue has an upper side, said lower side of the upper lip defining a first contact surface and said upper side of the tongue defining a second contact surface, wherein in coupled condition of two of such panels the first and second contact surfaces cooperate with each other, thereby defining a lowermost point of cooperation;

wherein in the coupled condition of two of such panels along respective side edges of said first pair of side edges, said lowermost point of cooperation defines a horizontal level;

the tongue, groove and the locking elements having a configuration such that in coupled condition of a pair of panels with the upper side edges adjoining each other and the locking surfaces in contact with each other, a chamber is provided between the distal end of the lower lip of one panel and a portion of the other panel from which the tongue part extends which faces said distal end of the lower lip; and

wherein in such coupled condition said chamber is located completely below said horizontal level.

11. The floor covering of claim 8 ,

wherein said locking elements at said first pair of side edges comprise a recess in said lower lip and a protrusion at the lower side of said tongue, said recess and said protrusion having said locking surfaces; and

wherein the locking surfaces extend perpendicular to a general plane of the floor covering.

12. The floor covering of claim 8 ,

wherein the coupling parts at the second pair of opposite side edges are provided with integrated mechanical locking elements including locking surfaces associated with the tongue and groove which prevent the drifting apart of two coupled flooring panels in a direction perpendicular to the related edges and parallel to the underside of the coupled floor panels; and

wherein the coupling parts and locking elements at the second pair of side edges are formed in one piece with said core.

13. The floor covering claim 12 , wherein the locking surfaces at the second pair of side edges contact 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 which would produce undesired gaps between the upper side edges in a direction perpendicular to the related side edges and parallel to the underside of the coupled floor panels.

14. The floor covering of claim 8 , wherein at the first pair and at the second pair of side edges, the groove is bordered by a lower lip which extends beyond the upper lip.