Set of surface covering planks and method of connecting thereof

Abstract

A set of planks for covering a surface is provided that has a first plank having a first edge defining a connecting tongue, and a second plank having a second edge defining a connecting groove. The first plank is movable between a disconnected position and a connected position, in which the connecting tongue is snap-fit in the connecting groove, and the connecting tongue has a distal protrusion and a proximal protrusion adapted to abut upwards in the connected position against a proximal lip and a distal lip of the connecting groove.

What is claimed is: 
     
         1 . A set of planks adapted to cover a surface perpendicular to a thickness direction of the planks, the planks having a lower face in the thickness direction intended to be in contact with the surface, said set of planks comprising at least a first plank having a first edge extending in a longitudinal direction perpendicular to the thickness direction, and a second plank having a second edge extending in the longitudinal direction, the second edge defining a connecting groove, and the first edge defining a connecting tongue, the first plank being movable with respect to the second plank between a disconnected position, in which the connecting tongue is away from the connecting groove, and a connected position, in which the connecting tongue is snap-fit in the connecting groove, the connecting tongue comprising two protrusions protruding in opposite senses in a transverse direction perpendicular to the thickness direction and to the longitudinal direction, the two protrusions including a transversely distal protrusion with respect to the first plank and a transversely proximal protrusion, the distal protrusion and the proximal protrusion being adapted to abut upwards in the connected position respectively against a transversely proximal lip and a transversely distal lip of the connecting groove, wherein, as measured along the transverse direction, a distance between a transversely extreme point of the distal protrusion and an upper part of the first plank is smaller than 10% of a distance between said transversely extreme point and a transversely extreme point of the proximal protrusion defining a length of the connecting tongue. 
     
     
         2 . The set of planks according to  claim 1 , wherein, in the intermediate position, the first plank is approximately parallel to the second plank. 
     
     
         3 . The set of planks according to  claim 1 , wherein, in the intermediate position, the proximal protrusion and the distal lip defines an overlap having a transverse extension smaller than 0.15 mm. 
     
     
         4 . The set of planks according to  claim 1 , wherein a lower side of the guiding recess is at least partly defined by a surface of the second edge, said surface defining an angle with the thickness direction, the angle being smaller than 45°. 
     
     
         5 . The set of planks according to  claim 1 , wherein a lower part of the proximal lip is at least partly defined by a surface of the second edge, said surface defining an angle with the thickness direction, the angle being larger than 45°. 
     
     
         6 . The set of planks according to  claim 1 , wherein the proximal lip of the connecting groove also forms a lip of the guiding recess. 
     
     
         7 . The set of planks according to  claim 1 , wherein:
 the proximal lip and the distal protrusion are pointy with a radius of curvature smaller than 0.1 mm, and   the distal lip and proximal protrusion are round with a radius of curvature greater than or equal to 0.1 mm.   
     
     
         8 . The set of planks according to  claim 1 , wherein the first edge and the second edge respectively comprise said upper part of the first plank and an upper part of the second plank, both extending from upper faces of the first plank and the second plank in the thickness direction, said upper part of the first plank and said upper part of the second plank being parallel to the thickness direction. 
     
     
         9 . The set of planks according to  claim 1 , wherein a lower part of the distal protrusion is at least partly defined by a surface of the first edge, said surface defining an angle with the thickness direction, the angle being smaller than 45°. 
     
     
         10 . The set of planks according to  claim 1 , wherein an upper part of the distal protrusion is at least partly defined by a surface of the first edge, said surface defining an angle with the thickness direction, the angle being larger than 45°. 
     
     
         11 . The set of planks according to  claim 1 , wherein a lower part of the distal lip is at least partly defined by a surface of the second edge, said surface defining an angle with the thickness direction, the angle being smaller than 10°. 
     
     
         12 . The set of planks according to  claim 1 , wherein an upper part of the proximal protrusion is at least partly defined by a surface of the first edge, said surface defining an angle with the thickness direction, the angle being smaller than 10°. 
     
     
         13 . The set of planks according to  claim 1 , further comprising at least one layer made from a material selected from the group consisting of a rigid thermoplastic material, a plasticized thermoplastic material, a mineral material, and a wood based material. 
     
     
         14 . The set of planks according to  claim 1 , wherein the second edge further defines a guiding recess at least partly located above the proximal lip and adapted to receive the distal protrusion transversely in an intermediate position of the first plank, in which the proximal protrusion abuts downwards against the distal lip, and wherein the guiding recess is defined with respect to an upper part of the second edge. 
     
     
         15 . The set of planks according to  claim 14 , wherein a distance, as measured along the thickness direction, between a transversely extreme point of the distal lip and a point, where the guiding recess and an upper part of the second edge meet, is greater than 30% of a distance between said extreme point and an upper face of the second plank. 
     
     
         16 . A method of connecting the set of planks according to  claim 14 , comprising:
 moving the first plank with respect to the second plank from the disconnected position to the intermediate position, in which the distal protrusion is received transversely in the guiding recess and the proximal protrusion abuts downwards against the distal lip of the connecting groove, and   moving the first plank with respect to the second plank from the intermediate position to the connected position, in which the distal protrusion and the proximal protrusion abut upwards respectively against the proximal lip and the distal lip of the connecting groove.