This design incorporates a lifting screw keyed to the worm gear as a single unit, forcing the lifting screw to rotate in the gearbox, but not translate. A traveling nut, running on the rotating screw generates linear motion for the attached load. This type of jack is ideal for applications that cannot accommodate a screw protection tube.
	
 






                                        


					 
					 
					 
					 
					 
                                        
                                        
                                        
                                        
                                        