| 摘要 |
A linear actuator orderly comprises an inner pipe, a middle pipe and an outer pipe, and the pipes are pivotally connected with each other. Each pipe is formed with at least three arc-shaped portions and three guiding portions, and the pipes abut against each other. The outer pipe is axially formed with a screw and two positioning rods that are passed through the middle pipe and the inner pipe, respectively. One end of each positioning rod is fixed with a pulling member, and one end of each pulling member is fixed to the inner pipe. The middle pipe is axially formed with a pushing post threaded with the screw. The pushing post and the middle pipe are pivotally disposed with a guiding wheel for rolling the pulling members, respectively. The pipes can be moved by the relative motion of the screw and the pushing post by cooperating with the guiding wheels and the pulling members, such that the pipes can be extended or retracted synchronously.
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