Unlocking system for panels

Abstract

A set of essentially identical panels, such as building panels, provided with a mechanical locking system including a displaceable tongue arranged in a displacement groove having a first opening at a first edge of a first panel. The tongue is configured to be displaced in the displacement groove along a displacement axis to attain a locking state wherein a first portion of the tongue cooperates with a first tongue groove having a second opening at a second edge of an adjacent second panel, for vertical locking of the first and the second edge. A second portion of the tongue is configured to cooperate with the second edge of the adjacent second panel via an elongated element for vertical unlocking of the first and the second edge.

1 - 20 . (canceled) 
     
     
         21 . A set of essentially identical panels provided with a mechanical locking system comprising:
 a displaceable tongue arranged in a displacement groove having a first opening at a first edge of a first panel, said tongue being configured to be displaced in said displacement groove along a displacement axis to attain a locking state wherein a first portion of the tongue cooperates with a first tongue groove having a second opening at a second edge of an adjacent second panel, for vertical locking of the first and the second edge; and   wherein a second portion of said tongue is configured to cooperate with said second edge of said adjacent second panel via an elongated element for vertical unlocking of the first and the second edge, wherein said displacement groove comprises a bottom surface, an upper surface and a lower surface, wherein a distance between the lower surface and the first portion corresponds to a diameter of the elongated element.   
     
     
         22 . The set of panels according to  claim 21 , wherein a first engagement portion of the second portion is configured to engage with the elongated element and delimits an unlocking groove configured to receive the elongated element such as to cause the tongue to be displaced along the displacement axis to attain an unlocking state for said vertical unlocking of the first and the second edge. 
     
     
         23 . The set of panels according to  claim 22 , wherein said first engagement portion and said second engagement portion are planar and extend side by side or in parallel or substantially in parallel. 
     
     
         24 . The set of panels according to  claim 22 , wherein said unlocking groove is configured to attain said unlocking state upon receiving an elongated element having a constant cross-sectional width in the longitudinal direction of said elongated element. 
     
     
         25 . The set of panels according to  claim 21 , further comprising an unlocking groove arranged between a second engagement portion of the second edge of the second panel and the second portion of the tongue when the first and second panels are vertically locked,
 wherein the second engagement portion of the second edge is configured to engage with the elongated element and delimits the unlocking groove, said second engagement portion being provided externally of said first tongue groove.   
     
     
         26 . The set of panels according to  claim 25 , wherein the second portion and the elongated element are configured to cooperate such that the tongue is displaced along the displacement axis at least to the extent that an outermost point of the second engagement portion and an outermost point of the first portion do not overlap. 
     
     
         27 . The set of panels according to  claim 23 , wherein a second engagement portion of the second edge is configured to engage with the elongated element and delimits the unlocking groove, said second engagement portion being provided externally of and below said first tongue groove. 
     
     
         28 . The set of panels according to  claim 21 , wherein the second engagement portion extends below a plane of the lower surface. 
     
     
         29 . The set of panels according to  claim 21 , wherein the distance corresponds at least to a dimension along the displacement axis between the first engagement portion and an outermost point of the tongue. 
     
     
         30 . The set of panels according to  claim 29 , wherein the dimension is measured from a point on a lower surface of the first portion, said point being aligned with an uppermost point of the elongated element. 
     
     
         31 . The set of panels according to  claim 21 , wherein said second portion comprises a chamfered edge portion, said edge portion being an outer end portion in the longitudinal direction of the tongue, the chamfered edge portion forming a guiding surface configured to guide said elongated element in the transverse direction of said tongue. 
     
     
         32 . The set of panels according to  claim 21 , wherein said second edge comprises a chamfered edge portion for guiding said elongated element towards said tongue. 
     
     
         33 . The set of panels according to  claim 21 , wherein said elongated element has a rotationally symmetric cross-section in a transverse plane thereof, by an angle of less than 120 degrees. 
     
     
         34 . The set of panels according to  claim 21 , wherein when the first and second panels are vertically locked together, the second portion of the tongue is arranged opposite an engagement portion of the second edge, said engagement portion of the second edge being provided externally of said first tongue groove.