Forklift mast

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 substantially transverse to the direction of movement of the forklift and facing the cylinder liner 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) or in its immediate vicinity, and a support surface (18, 19) substantially transverse to the direction of movement of the forklift and disposed on the second protrusion (15) or on the outer surface of the cylinder liner facing the first protrusion (14). The invention also relates to a method for producing an integrated structure (4, 5).

Description

Technical field [0001] The present invention relates to a forklift mast, and more particularly, the present invention relates to a two-stage or multi-stage forklift mast, which is fixedly or tiltably fixed to a frame and formed with a first pair of substantially vertical beams, so The first pair of beams are connected to each other by at least one substantially horizontal beam. These components form a fixed mast structure (or a sturdy mast structure), and at least one second pair of substantially aligned vertical beams are arranged in In the vicinity of the structure, the second pair of vertical beams are connected to each other by at least one substantially horizontal beam, and these components form a bracket, which is arranged to be opposed to a fixed mast (or mast) under the push of a hydraulic cylinder piston. The structure moves vertically, and the movement and force are transmitted directly or through cables (or steel cables) from the piston of the hydraulic cylinder to the ...

AI Technical Summary

Problems solved by technology

Due to the requirements of this manufacturing method, the manufacture of the beam of DE3200287A1 requires the addition of "counterweights" so that the center of gravity is at or near the center of the cylinder bore, which will result in a very heavy integral beam, and its manufacture will consume a large amount of steel, and The external dimensions of the monolithic beam will increase

A mast configuration of increased size would in turn excessively obstruct the view or have a negative impact on the mobility of the vehicle

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