| 摘要 |
<p>The invention relates to a two- or multi-stage mast-hydraulic cylinder construction (4, 5) for a truck mast. The fixed mast assembly has its substantially vertical beams (4, 5) and its cylinder liners (29) provide an integrated structure (4, 5), wherein the cylinder liners (29) are constituted by channels integrated inside the beams (4, 5), said integrated structures having their centre of mass at the centre of the cylinder liner (29) or in the immediate vicinity thereof, that the integrated structure (4, 5) is capable of being manufactured by hot extrusion or cold drawing, and that the integrated structure (4, 5) is provided with one flange (13), one side of which comprises a bearing surface (16) and the opposite side comprises a support surface (17), said surfaces (16, 17) lying in a plane transverse to the operating direction of a truck, and with at least one second flange (19) for locating the centre of mass at the centre of the cylinder liner (29) or in the immediate vicinity thereof. The invention relates also to a method for manufacturing the integrated structure (4, 5). <IMAGE></p> |
