SET OF PANELS THAT CAN BE VERTICALLY UNLOCKED， A METHOD AND A DEVICE THEREFORE

The present invention relates to set of essentially identical panels (1， 2)， such as building panels， provided with a mechanical locking system including a displaceable tongue (30) arranged in a displacement groove (40) having a first opening at a first edge (11) of a first panel (1). The tongue (30) is configured to be displaced in the displacement groove (40) along a displacement axis to attain a locking state wherein a first portion (31) of the tongue (30) cooperates with a first tongue groove (20) having a second opening at a second edge (22) of an adjacent second panel (2)， for vertical locking of the first and the second edge (11， 22).A second portion (32) of the tongue (30) is configured to cooperate with the second edge (22) of the adjacent second panel (2) via an elongated element (70) for vertical unlocking of the first and the second edge (11， 22).