| 摘要 |
<p>The present invention relates to a lattice beam (42) used for making mobile constructions, particularly fair and exhibition displays and consisting of a plurality of parallel-extending metal hollow sections (1, 2, 3) held together by trellis structures (4) running obliquely through said sections. The invention is characterized in that three hollow sections (1, 2, and 3) are joined to a beam having an isosceles triangle cross-section. The hollow section (1) at the tip of the triangle is provided with hollow chambers (9, 10, 11, 12, 13, 14) and each of the remaining two hollow sections (2, 3) are provided with hollow chambers (19, 20, 21, 22, 23), arranged mirror-like symmetrically to a plane (5) extending in the middle between arms (6) of equal length. At least some of the hollow chambers (12, 13, 14; 19, 20, 21, 23) of all the hollow sections (1, 2, 3) are provided with a slit (15, 18), which opens outwards on their outer wall. Each hollow section (1, 2, 3) is provided with three hollow chambers (12, 13, 14, optionally 20, 21, 23), which are provided each with one outward opened slit (15, 18), whereby each two of the slits (15) direct toward the slit (15) in the adjacent hollow section (1, 2, 3), while the third slit (18) is arranged in the chamber (12, optionally 20), directing outward from the triangular cross section.</p> |
