| 主权项 |
1. A load lifting assembly, comprising:
a fixed pole; a lifting unit capable of moving longitudinally along the pole, wherein the lifting unit comprises:
a plurality of bars;a plurality of bearings mounted laterally on the bars, wherein the bearings contact the pole;a plurality of first screws disposed in a first plane;a plurality of second screws disposed in a second plane;a pair of first connectors, wherein the pair of first connectors are connected proximately to the opposite ends of each of the first screws;a pair of second connectors, wherein the pair of second connectors are connected proximately to the opposite ends of each of the second screws; a load transporting unit coupled to the lifting unit; and a driving unit, wherein the driving unit drives the load transporting unit. |
