Floor panel

A floor panel in a shape of a rectangular plate provided with a tongue (6) at one side and a groove (5) at an opposite side, the tongue (6) and the groove (5) forming coupling parts at least at two opposite sides with neighboring floor panels,

• the coupling parts comprising integrated mechanical locking means having a protrusion (7) formed on the tongue (6) and a lip (8) bordering the groove (5) formed by an extraction of material along a longer arm of the groove (5),
• wherein the lip (8) has a bearing surface (9) inclined to a center of the floor panel and downwards, the bearing surface (9) of the lip (8) being concave on an arc with a first radius (r1), the first radius having a point of engagement situated at an upper border of the floor panel (1),
• and wherein the protrusion (7) of the tongue (6) has, in cross-section, a circular section with a third radius (r3) being shorter than the first radius (r1),
• and wherein a lower part of the lip (8) and a lower part of the floor panel (1) facing a side of the circular protrusion (7) have second bearing surfaces (9′) inclined in relation to a vertical plane at the same direction at a first acute angle (α);each of said second bearing surfaces (9′) being substantially parallel to each other;
• the second bearing surfaces (9′) of the neighboring floor panels after assembling floor panels are distanced at a gap (s) in dried condition and transfer pressure forces caused by expansion of panel material when moistened.

A floor panel having a shape of a rectangular plate provided with coupling parts in a form of a tongue (6) at one side and a groove (5) at an opposite side,

• the coupling parts comprising integrated mechanical locking means having a protrusion (7) formed on the tongue (6) and a lip (8) bordering the groove (5) formed by extraction of material along a longer arm of the groove (5),
• wherein the lip (8) has a bearing surface (9) inclined to a center of the floor panel and downwards, the bearing surface (9) of the lip (8) being concave with a curvature with a first radius (r1), the first radius having a point of engagement situated at an upper edge of the floor panel (1),
• and wherein the protrusion (7) of the tongue (6) has in a cross-section a circular section with a third radius (r3) being shorter than the first radius (r1),
• and wherein a lower part of the lip (8) and a lower part of the floor panel (1) facing a side of the circular protrusion (7) have second bearing surfaces (9′) inclined in relation to a vertical plane at one direction at a first acute angle (α);
• each of said second bearing surfaces (9′) being substantially parallel to each other;
• the second bearing surfaces (9′) of the neighboring floor panels after assembling floor panels are distanced at a gap (s) in dried condition and transfer pressure forces caused by expansion of panel material when moistened whereby possibility of warping of a floor or destruction of couplings is substantially avoided.