Patent ID: 8210064

Claim:
An actuator used in a lifting device, comprising: a base defining an accommodation chamber; a motor mounted on said base; a worm suspended in said accommodation chamber and rotatable by said motor; a transmission gear set mounted in said accommodation chamber, said transmission gear set comprising a gear shaft pivotally mounted in said accommodation chamber inside said base, a worm gear pivotally mounted on said gear shaft and meshed with said worm, an output gear fixedly mounted on one end of said gear shaft; a brake module mounted on said gear shaft of said transmission gear set and accommodated in said accommodation chamber of said base, said brake module comprising a stop device rotatable with said worm gear; and a linking rod assembly mounted in said accommodation chamber of said base, said linking rod assembly comprising a driven gear meshed with said output gear of said transmission gear set, a screw rod fixedly connected to one side of said driven gear and extending out of said base, a movable block threaded onto said screw rod and movable along said screw rod during rotation of said screw rod, and an extension tube connected to said movable block and movable with said movable block in and out of said base.