Mechanical locking of floor panels with vertical snap folding and an installation method to connect such panels

1. An installation method to vertically and horizontally connect rectangular floor panels, provided with mechanically locking systems at the long and the short edges, by vertical snap folding at the short edges and angling at the long edges wherein the method comprises the steps of:

laying a first panel flat on a sub floor

bringing a second panel in an angled position with its long edge in contact with a long edge of the first panel

bringing a long edge of a new panel in an angled position and in contact with an upper part of a long edge of the first panel, whereby the new panel has a higher angle against the sub floor than the second panel,

bringing a short edge of the new panel in contact with a short edge of the second panel,

pressing and displacing the short edge of the new panel downward and horizontally along the long edge towards the short edge of the second panel, and thereby connecting the edges of the first and the second panels to each other in an essentially common plane with a vertical snap folding,

angling the new and the second panel downward towards the sub floor and thereby finally connecting the first, second and third panel to each other in a common plane with vertical snap folding.

2. The method as claimed in claim 1 wherein the pressing causes a bending of a locking strip of the mechanical locking system at the short edges and said horizontally displacing is obtained by a resilient spring back force of the bending.

3. The method as claimed in claim 1 , wherein the angled position of the second panel is at an angle in which the long edges are connected in the horizontal and the vertical direction.

4. The method as claimed in claim 1 , wherein the angled position of the second panel is at an angle in which the long edges are only connected in the horizontal direction.

5. A set of essentially identical floor panels each comprising long and short edges provided with a mechanical locking system comprising first and second connectors integrated with the floor panels, and wherein immediately juxtaposed upper parts of two adjacent joint edges of two joined floor panels together define a vertical plane perpendicular to the main plane of the panels,

the first connector comprises a locking strip with an upwardly directed locking element, at a first edge of a floor panel, configured to cooperate with a downwardly open locking groove at an adjacent second edge of another floor panel for connecting the adjacent edges horizontally in a direction perpendicular to the vertical plane,

the second connector comprises a tongue, either at the first or the second edge, extending horizontally perpendicular to vertical plane, configured to cooperate with a horizontally open tongue groove, at the other of said first or second edge, for connecting the adjacent edges in vertical direction parallel to the vertical plane,

the connectors at the long edges are configured to be locked with angling and the connectors at the short edge are configured to be locked with vertical snap folding,

wherein the tongue at one of the short edges is formed in one piece with the panel and configured to protrude from a substantially vertical upper surface at the short edge with the tongue,

wherein the mechanical locking system at the long edges is configured such that a new panel is displaceable vertically substantially along the vertical plane of a first panel and relative the first panel when the new floor panel is in an angled position in relation to the first floor panel and with the tongue within the tongue groove, and the upper part of the locking element within the locking groove,

wherein the short edge with the tongue groove is provided with a second tongue above the tongue groove, which second tongue protrudes horizontally,

wherein the angle, against the horizontal plane, of an upper surface of the tongue is lower than the angle of the locking surface of the locking groove.

6. The set of essentially identical floor panels as claimed in claim 5 , wherein the angle of the locking surface of the locking groove against the horizontal plane is more than about 60 degrees.

7. The set of essentially identical floor panels as claimed in claim 6 , wherein the angle is more than about 70 degrees.