China Multiple Screw Jacks Can Be Combined Into a Lifting System. Powered by a Geared Motor, The Jacks Are Connected in an H Configuration by Couplings, Bevel Gears., Find details about China High Raised Table Lift, Motorized Worm Gear Screw Lift Table from Multiple Screw Jacks Can Be Combined Into a Lifting System. Powered by a Geared Motor, The Jacks Are Connected in an H Configuration by Couplings, Bevel Gears.