Mechanical locking system for floor panels

Abstract

Floor panels are provided with a mechanical locking system having small local protrusions which reduce displacement along the joint when the panels are laying flat on the sub floor and locked vertically and horizontally. A method to install a floor comprising a plurality of rectangular floor panels laying in parallel rows on a sub floor with long and short edges which are connectable to each other along one pair of adjacent long edges and one pair of adjacent short edges.

1 . A flooring system, comprising a plurality of rectangular floor panels adapted to be installed on a sub floor, said floor panels having long and short edges which are connectable to each other along one pair of adjacent edges of adjacent panels having a mechanical locking system comprising a tongue formed in one piece with the panels and a groove for mechanically locking together said adjacent edges at right angles to the horizontal plane of the panels, thereby forming a vertical mechanical connection between the panels, and a locking element at one first edge and a locking groove at an opposite second edge thereby forming a first horizontal mechanical connection locking the panels to each other in a direction parallel to the horizontal plane and at right angle to the joint edges, wherein:
 each panel at said adjacent edges being provided with a second horizontal mechanical connection locking the panels to each other along the joint edges, in a direction parallel to the horizontal plane and parallel to the joint edges, when the panels are laying flat on the sub floor,   said second horizontal mechanical connection comprises a plurality of small local protrusions in said mechanical locking system which prevents displacement along the joint edges when the panels are laying flat on the sub floor and are locked with the vertical and the first horizontal connections.   
     
     
         2 . The flooring system as claimed in  claim 1 , wherein the locking groove is open towards the rear side. 
     
     
         3 . The flooring system as claimed in  claim 1 , wherein the protrusions are formed on both the first and the second edge. 
     
     
         4 . The flooring system as claimed in  claim 1 , wherein the first horizontal locking connection comprises a strip which is an extension of the lower part of the groove and that the locking element is formed on the strip. 
     
     
         5 . The flooring system as claimed in  claim 1 , wherein the mechanical locking system comprises a separate material, other than the material of the panel core, which is connected to the floorboard. 
     
     
         6 . The flooring system as claimed in  claim 1 , wherein the small local protrusions are formed in one piece with the panel. 
     
     
         7 . The flooring system as claimed in  claim 1 , wherein each small local protrusion comprises an individual part of a separate material, other than the material of the panel core, which individual parts are applied in the mechanical locking system and connected to the floorboard. 
     
     
         8 . The flooring system as claimed in  claim 5 , wherein local protrusions are formed in the panel such that they cooperate with the separate material when two floor panels are locked in the same plane. 
     
     
         9 . The flooring system as claimed in  claim 5 , wherein small local protrusions are formed in the separate material. 
     
     
         10 . The flooring system as claimed in  claim 5 , wherein small local protrusions are formed in the separate material and in the panel. 
     
     
         11 . The flooring system as claimed in  claim 5 , wherein the separate material is aluminum. 
     
     
         12 . The flooring system as claimed in  claim 1 , wherein essentially the whole length of the edge comprises small local protrusions. 
     
     
         13 . The flooring system as claimed in  claim 1 , wherein there is a space between the local protrusions and the adjacent edge of the adjacent panel when the adjacent panels are in an angled position relative each other. 
     
     
         14 . The flooring system as claimed in  claim 13 , wherein the adjacent panels are displaceable along the joint edges when the upper part of join edges are in contact and when said adjacent panels are in an angled position relative each other. 
     
     
         15 . A method to install a floor comprising a plurality of rectangular floor panels laying in parallel rows on a sub floor with long and short edges which are connectable to each other along one pair of adjacent long edges and one pair of adjacent short edges, said panels having a mechanical locking system comprising a tongue formed in one piece with the panels and a groove for mechanically locking together said adjacent long and short edges at right angles to the horizontal plane of the panels, thereby forming a vertical mechanical connection between the panels, and a locking element at one first long edge and a locking groove at an opposite second long edge thereby forming a first horizontal mechanical connection locking the long edges of the panels to each other in a direction parallel to the horizontal plane and at right angles to the joint edges, each panel at said adjacent long edges being provided with a second horizontal mechanical connection locking the panels to each other along the joined long edges in a direction parallel to the horizontal plane and parallel to the joint edges when the panels are laying flat on the sub floor, said second horizontal mechanical connection comprises small local protrusions in said mechanical locking system on the long edges which reduces displacement along the joint when the panels are laying flat on the sub floor and are locked with the vertical and the first horizontal connections, the method comprising:
 installing a first panel on a sub floor in a first row, bringing a second panel in a second row into contact with its long edge against the long edge of the first panel and held at an angle against the sub floor, bringing a new panel in a second row at an angle with its long edge in contact with the long edge of the first panel and its short edge in contact with the short edge of the second panel, displacing the new panel against the second panel in the angled position thereby bringing the tongue into the groove until the top edges at the short edges are in contact with each other, angling the second and new panels down to the sub floor thereby locking the long edges of the second and new panels to the first panel in a vertical direction and in a first horizontal direction perpendicular to the joined long edges and in a second horizontal direction along the long edges whereby the locking in the second horizontal direction prevents separations between the short edges of the second and the new panel.   
     
     
         16 . The method as claimed in  claim 15 , wherein the panels have a surface layer of laminate or wood. 
     
     
         17 . The method as claimed in  claim 15 , wherein the grove has an upper lip and lower lip on its lower part which extends beyond the upper lip. 
     
     
         18 . The method as claimed in  claim 17 , wherein the tongue is on the short edge of the new panel and the lower lip on the short edge of the second panel and that the tongue is angled on the lower lip when the new panel is brought into the contact with the second panel. 
     
     
         19 . The method as claimed in  claim 15 , wherein the small local protrusions in said mechanical locking system on the long edges prevents displacement along the joint when the panels are laying flat on the sub floor and are locked with the vertical and the first horizontal connections. 
     
     
         20 . The method as claimed in  claim 15 , wherein the first and second panels have long and short edges which are connectable to each other, said short edges lock together only at right angles to a horizontal plane of the panels.