| 摘要 |
<p>The frame has a lower and upper frames (4) formed of an assembly of cross-pieces (3) and connected to an end of an upright (2) by one of the wedges of the lower frame. The cross-pieces are cut at forty five degrees, and the wedges have an internal angle and an external angle. An interlocking section (9) is disposed, at the level of assembling of two ends of the cross-pieces, between the angles, where the cross pieces and the section are assembled by external and internal soldering, and the upright is interlocked to the section.</p> |
