manually or by motor. With the rotation of the worm gear, the screw in it moves upwards or downwards linearly. If the screw end
connection is connected to a free load, the screw rotates circularly and moves up and down. If it is connected to a fixed load, the
gearbox in the jack receives the movement from the gear unit and the trapezoidal screw moves only linearly up and down. In other
words, it acts the same as the Wedged type, so there is no need to open wedge channel for trapezoidal screw.
The linear motion of the screw depends on the turning speed, the number of teeth of the gears and the size of the screw pitch.