Type R is characterised by the rotating threaded spindle with travelling nut. This means that the stroke movement is carried out with the travelling nut, the jack screw remains fixed in its axial position. This means that type R worm gear screw jacks can be mounted directly on the base without requiring any installation space opposite the spindle side.
The advantage of this is that the screw drive is always located outside the gear housing. The resulting lower heat generation in the housing allows a higher duty cycle under the same operating conditions.
R-type quick-lift gearboxes are available with trapezoidal or ball screw drive and various nut applications.