A mechanical jack is a type of manual lifting tool. It features a compact structure and utilizes the swing of a rocker lever to rotate a pinion. This, coupled with a pair of bevel gears, drives a screw, which in turn pushes a lifting sleeve, thereby raising or lowering a load.
A mechanical jack is a type of manual lifting tool. It features a compact structure and utilizes the swing of a rocker lever to rotate a pinion. This,...
Ordinary screw jacks rely on the self-locking action of the threads to support heavy objects. While simple in construction, they suffer from low trans...