| 摘要 |
A groove profile (4) and a tongue profile (5) comprise edge profiles which are respectively formed on two opposite edges of panels (2,3). The engaged groove and tongue profiles form an articulated joint (G) that restores the panels to their installation plane when deflected either up or down. The groove profile has an upper groove wall (6) and a lower groove wall (7). The tongue profile has a notch projection (12) on the underside of the tongue that engages a notch recess (11) in the lower groove wall of an adjacent panel in the assembled state. The inside of upper groove wall has a flank (21) that opens towards the free end of the upper groove wall. |
