Rotating screw jack , also called travelling nut screw jack .
In this design , the screw does not travel through the housing. It rotates in place while the nut travels up and down the screw in either direction, providing linear motion for the attached load. A load must be fixed to the nut in order for the traveling of the nut to occur.
Where to use rotating screw jacks ?
It is proper for applications where the physical space does not allow the lifting screw to extend below the gearbox . Rotating screw jacks are also useful when it is not possible to fully guide the load.
As it also uses trapezoidal screw , so also has self locking function . Can be drived by a hand wheel , motor or other input sources.