Patent ID: 8505257

Claim:
A set of floor panels provided with a locking system comprising a displaceable tongue in a displacement groove at a first edge of a first floor panel and a tongue groove in an adjacent first edge of a similar second floor panel for connecting the edges vertically, the first floor panel including a second edge orthogonal to the first edge, the second edge having a vertical joint plane on an upper part of the second edge for abutting against an edge of a third floor panel, wherein the tongue and the tongue groove are displaceable in relation to each other and the tongue is displaced in a direction essentially along and parallel with the adjacent first edges during locking of the floor panels, the tongue comprises a pressing part that protrudes from the vertical joint plane on the upper part of the second edge and a protrusion extending horizontally beyond the upper part of the first edge, and wherein the tongue groove comprises a protrusion and a cavity configured such that the adjacent first edges can obtain a vertically unlocked position where the protrusion of the tongue matches the cavity of the tongue groove and a vertically locked position where the protrusion of said tongue vertically overlaps the protrusion of said tongue groove.