Patent attributes
An opening/closing structure for an automatic umbrella contains: a shaft assembly, a frame, a notch, a first runner, a second runner, a driving mechanism, and a handle. The shaft assembly includes a first tube and a second tube. The frame couples with the notch and the second runner. The driving mechanism includes a screw rod and a push post. The push post has a drive portion and inner threads. The push post is connected with the first tube by inserting a joining element into the second tube, and the second tube has a slot longitudinally formed on an outer wall thereof. The joining element moves upwardly or downwardly along the slot. The push post has the drive portion, a coupling portion, and a deforming portion. The deforming portion is sufficiently rigid to shaft itself in an axial direction and deforms and recovers its original shape in a torque direction.
