Trapezoidal Screw may be used individually or in multiple arrangements . there are no “ standard “ travel lengths and each Worm Gear Screw Jack is built to specification .
The working principle of the hand operated worm gear screw jack is that the worm (also called the input shaft) is manually rotated by the hand wheel. the worm wheel(also called the worm gear) is rotated by the worm, and the trapezoidal lifting screw is moved by the rotating worm wheel.