A Inverted Rotating Screw Jack has a lift shaft that moves a nut as it turns. The lift shaft is fixed to the worm gear. This causes the load, which is attached to the travel nut, to move along the lift shaft. A Inverted Roating Screw jacks has the lift shaft extending out the bottom of the jack.
Depending on size, Inverted Rotating designs are available with optional accessories such as boots, motor mounts, right-angle reducers, motors, encoders and rotary limit switches.