| 主权项 |
1. A heavy duty lift system comprising:
first and second scissors, each scissor comprising at least a first, bottom, tier, a second, intermediate, tier, and a third, upper, tier, and a cylinder diagonally positioned and coupled, at one end, near the top of the first tier and, at the other end, near the bottom of third tier, each one of the scissors capable of being located below a ground surface; a support structure capable of being located in a pit; a carriage for supporting the second scissor from the support structure and reciprocally movable within the support structure in a direction substantially perpendicular to a lift direction of the second scissor so as to allow reciprocal movement of the second scissor; and, a first cover coupled to a first side of the carriage and a second cover coupled to a second, opposing, side of the carriage, the first and second covers configured to extend away from the first and second sides, respectively, of the carriage such that the covers are configured to move reciprocally with reciprocal movement of the carriage. |
