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The use of mechanical jacks are implemented by manual, manual turns a handle and the rotation of the motion of the rocker driving pinion, at that time, will cooperate with small bevel gears gear rotating together, bevel gears turning the screw rotation, causes the rise and fall of the sleeve, the weight will be hold up or down, the weight is held, the screw thread self-locking function can support heavy weights, guarantee the weight will not fall, after the completion of the work, shaking a handle and the gear in the opposite direction movement, set of rod drop, the weight is down.
Update time:20220114105921