| abstract |
The bar has inner and outer tube sections (1,2) joined together by webs (15-22). The peripheral wall (8,10,12,14) of the outer section (2) has at least two or more adjacent longitudinal slots (32-39). The bar also has recesses (41-43) located between the sides of each web, parallel to the adjacent sides of the inner section (1), to secure flat supporting members. There can also longitudinal flutes (401,402) at both sides of each web, communicating through the slots to the outside. These form guides and are of the same width, having sidewalls in pairs in two parallel planes. |