method to control the movements of an expandable mastkonstruktion of a lift truck and appropriate mastkonstruktion

摘要

the invention relates to an expandable mastkonstruktion for a pallet truck, with the mastkonstruktion (10), a fixed mast (11) and a movable mast (13), so that it is mounted in relation to the fixed mast and up and down movements, and a bearer structure (20). includes the movable mast and up and down movements, as well as a hebeeinrichtung,consisting of a first lifting (25) to lift the load bearing structure to the movable mast and a second lifting (33) to raise the mastkonstruktion, with two lifting selected arbeitsquerschnittsflu00e4chen), the first lifting so st your that the weightbearing construction liftingbefore the second lifting the mastkonstruktion drive.in operation, the second lifting begins before the end of the first hubzylinders arbeitshubes with the wheel, with the rest of the arbeitshubes the first hubzylinders second lifting when extending the mastkonstruktion supported and, at the same time the weightbearing used i a reference to the mastkonstruktion raisingand the second lifting finished his arbeitshub subsequently. to this end, the movable part of the first hubzylinders is a anschlageinrichtung on the fixed mast at a point in the middle of his travel. the overlapping operation of the two lifting any interruption or jerky movement in the...