Hand wheel worm gear screw jack is composed of hand wheel or hand crank and a complete set worm gear screw jack with internal worm and worm gear sets, standard hand wheel or hand crank.
Manual Screw Jack is ideal solutions for applications where electricity or power generators is inconvenient or dangerous, light weight, low duty cycle, low target cost and short travel length.
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.