| 摘要 |
<p>The system (110) has a frame (104) delimiting a median plane (P), and a beam (111) extending between two opposed sides of the frame, and having two grooves (111a). The grooves are placed in a symmetrical manner with regard to the median plane. Two rods (112a) are provided with a set of ends, where the rods are ready to be placed in the grooves for blocking of the beam in the frame. A set of regulation units such as clamps (113), regulate tension between the ends in an independent manner, where the system is ready to warp the beam with regard to the median plane. The frame and the beam are made of medium density fiberboard. An independent claim is also included for a planar element.</p> |
