Dangerous
Workers need to climb up columns to take off lifting devices.
Falling may easily happen.
Time-consuming
Two/Three workers needed to complete tasks, man-power consuming.
Energy-consuming
More strength needed for workers, accidents possibly created. |
Safe
Workers do not need to climb up columns and take off devices by wire only.
Fast
Only one man needed to take off devices, saving man-power.
Energy-saving
Only pulling control wire is needed to take off lifting devices, workers do not need to climb up columns. |