| 摘要 |
<p>A crossbeam (1), in particular for holding and supporting lifting tables to be carried by one, two or more in row arranged legs (2A, 2B) supported and held by the beam, is composed of at least two into each other inserted profiles or channel irons (4, 10) each preferably of C-shaped cross-section. The C-apertures of the cross-sections of these profiles (4, 10) are oriented in opposing, away from each other pointing, directions. The cavity of the C-shape of one of the profiles (10) is cross-sectionally, in the portion of the cavity located opposite to the C-aperture of the external profile (10), for the internal receiving of the other profile (4), fitting in shape with the periphery of this other profile (4) in vicinity of the borders of the aperture of the C-shape of this profile and at least with a portion of the top and bottom surfaces (4A, 4B) of it. The external of the profiles (10) has, at the portion of its C-shape which is located opposite to the aperture of its C-shape, openings (20A, 20B) in shape adapted to receive the, of the crossbeam (1) supported legs (2A, 2B). The C-shaped profiles (4, 10) are fastened to each other by joining means and/or welding at least at the transitional areas between the internal C-shaped profile (4) and the top and bottom portions (4A, 4B) near the legs (2A, 2B). The crossbeam or transverse girder provides a safe keeping-in-position of the legs (2A, 2B) also in case of strong moments of force.</p> |
