Mechanical locking system for floor panels

A set of floor panels which are mechanically connectable to each other along one pair of adjacent edges by a vertical motion, so that upper joint edges of said floor panels in the connected state define a vertical plane, each of said floor panels comprising:

• a tongue on a first edge of a panel having a length direction extending parallel with the first edge;
• a tongue groove on a second opposite edge of the panel for receiving the tongue of an adjacent panel for mechanically locking together said adjacent edges in a vertical direction;
• wherein the tongue has an inner part mounted in a sideward open groove in the first edge and an outer part extending beyond the vertical plane, the inner part is fixed in the sideward open groove,
• wherein the tongue comprises at least one rocker arm extending in the length direction of the tongue, the at least one rocker arm comprising a displaceable pressing protrusion that during locking is in contact with the second edge and a displaceable locking protrusion that in locked position cooperates with the tongue groove,
• wherein the locking protrusion is displaced outwardly away from a main body of the tongue by the at least one rocker arm turning about an axis which is perpendicular to the length direction of the tongue when the pressing protrusion is pressed and displaced inwardly towards the inner part of the tongue.