... reducer and translated driven by the chain wheel, Screw Axis. Product Description1, Electrical system is controlled by ... , it is low breakdown, easy installation and realize "Plug & Work" function. 2, There is torque limiter ... be saft and simple. The coil ifter with Screw Axis is low speed for claw open and ... the weight is heavier than other type, the screw axis is self-lock that the coil lifter ...