Abstract: An actuator includes a base, a motor mounted on the base for driving a worm to rotate a worm gear of a transmission gear set that is set in an accommodation chamber inside the base and has a gear shaft pivotally inserted through the worm gear and fixedly mounted with an output gear, a brake module rotatable with said worm gear, a linking rod assembly having a driven gear meshed with the output gear, a screw rod rotatable with the driven gear, a movable member threaded onto the screw rod and an extension rod connected to the movable block and movable in and out of a sleeved outside the base upon rotation of the screw rod for biasing a crane beam of a lifting device.

Abstract: An actuator includes a base, a motor mounted on the base for driving a worm to rotate a worm gear of a transmission gear set that is set in an accommodation chamber inside the base and has a gear shaft pivotally inserted through the worm gear and fixedly mounted with an output gear, a brake module rotatable with said worm gear, a linking rod assembly having a driven gear meshed with the output gear, a screw rod rotatable with the driven gear, a movable member threaded onto the screw rod and an extension rod connected to the movable block and movable in and out of a sleeved outside the base upon rotation of the screw rod for biasing a crane beam of a lifting device.