Abstract: The invention relates to the mast-hydraulic cylinder construction (4, 5) of a two or multiple-stage forklift mast. The substantially vertical beams (4, 5) and cylinder liners (6) of the solid mast structure form an integrated structure (4, 5), in which the cylinder liners (6) consist of ducts integrated within the beams (4, 5), with the mass centre of the cross-section of the integrated structures being at the centre of the cylinder liner (6) or in its immediate vicinity so that the integrated structure (4, 5) can be manufactured by heat extrusion or cold drawing, and in that the integrated structure (4, 5) comprises a first protrusion (14), whose surface is a bearing surface (17) for a roller bearing (16), and a second protrusion (15) for providing a mass centre at the centre of the cylinder liner (6), and a support surface (18, 19) substantially transverse to the direction of movement of the forklift. The invention also relates to a method for producing an integrated structure (4, 5).

Abstract: A two- or multi-stage mast-hydraulic cylinder construction (4, 5) for a truck mast, and method for manufacturing the intergrated structer (4, 5), are discloused.

Abstract: 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.