Patent ID: 7810793

Claim:
A pulley actuator, comprising: a motor, outputting a rotational force to a reducing mechanism through a coupling device for the reducing mechanism to transmit the rotational force to a screw that is coupled with a guide rod, wherein the guide rod has one end adjacent to the screw provided with a guide seat, and an opposite end equipped with a first pulley, in which the guide seat includes a second pulley set at a lateral thereof; a tube assembly, including a first tube, a second tube and a third tube telescoped in an outward order, wherein the first tube is coaxially mounted around the screw, and a sleeve coaxially extends inside the third tube from a distal end of the third tube toward the reducing mechanism for receiving the guide rod therein, the sleeve having a pressing block set as a proximal end thereof; and a flexible rope, having one end fixed to the reducing mechanism and an opposite end passing around the first pulley and the second pulley, and then fixed inside a distal end of the first tube with a middle portion pressed by the pressing block; whereby, when the motor drives the screw and the guide rod to relatively expand or retract, the flexible rope draws the sleeve to move correspondingly.