| 摘要 |
A scissors-type work platform lift machine includes a chassis, a work platform, a scissors lift mechanism, and a telescopable electro-mechanical actuation arrangement. The work platform is disposed above the chassis. The scissors lift mechanism has a plurality of portions pivotally movable relative to one another, an upper end portion pivotally mounting the work platform above the chassis, and a lower end portion pivotally mounted on the chassis. The pivotally movable portions are movable vertically between retracted and expanded conditions so as to move the work platform between lowered and raised positions relative to the chassis. The actuation arrangement extends and is mounted to selected upper and lower ones of the pivotally movable portions of the lift mechanism and is adapted to operate the lift mechanism between the retracted and expanded conditions. The actuation arrangement has a telescopable contractable and extendable component capable of varying in length and operable to undergo rotation in a first angular direction and translational contraction in length in a first linear direction so as to cause movement of the lift mechanism vertically toward the retracted condition and thereby movement of the work platform toward the lowered position. The telescopable component also is operable to undergo rotation in a second angular direction opposite to the first angular direction and translational extension in length in a second linear direction opposite to the first linear direction so as to cause movement of the lift mechanism vertically toward the expanded condition and thereby movement of the work platform toward the raised position.
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