... duty,Uniform lifting speed and fully synchronized. 3. To select single screw jack lift table, or multi screw jacks lift tables4. Lift ... Table Structural elements: single or multi screw jacks,Spiral bevel gearboxes, ... Hand wheel or Motors6. Screw Lift Table:Screw Jack instead of hydraulic jack,air bag,spring,linear actuator7. Screw jacks are used ...