| 摘要 |
In one embodiment of the present invention, an apparatus for lifting an object includes a rotational axis that has a first lead screw threaded in a first direction, a second lead screw threaded in a second direction, and a coupler that couples the first lead screw and the second lead screw. A first lifting arm has first and second members that move in a first plane that is substantially parallel to the rotational axis, and a second lifting arm has first and second members that move in a second plane that is substantially parallel to the rotational axis. A first transverse member is coupled to the first lead screw, and a second transverse member is coupled to the second lead. Rotation of the rotational axis in a first direction raises the first and second lifting arms, and rotation of the rotational axis in a second direction lowers the first and second lifting arms.
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