Mechanical lockings of floor panels and a tongue blank

A set of panels comprising a locking system, the locking system comprising a displaceable tongue having a main tongue body and at least two wedge parts located in a displacement groove in a first edge of a first panel of the set of panels, an adjacent second edge of a second panel of the set of panels comprising a tongue groove, the displaceable tongue being configured to lock the first edge and the adjacent second edge together, the main tongue body comprises at least two flexible protrusions and at least two recesses, each of the wedge parts is located at least partly in one of the at least two recesses, the at least two flexible protrusions are slideable against the wedge parts to obtain a displacement of the main tongue body in a direction perpendicular to the first edge and the adjacent second edge and thereby cause locking of the first edge and the adjacent second edge, wherein the at least two flexible protrusions, in an unlocked position, are essentially displaced along the displaceable tongue in relation to the at least two wedge parts and configured to exert a tension against the at least two wedge parts and the tongue groove, wherein the at least two wedge parts comprise a friction connection that inhibits the wedge parts from being displaced in the displacement groove when the main tongue body is displaced along the first edge, and wherein the at least two wedge parts and the main tongue body comprise releasable wedge part connections adapted to be released during the insertion of the displaceable tongue into the displacement groove.