Knob assembly and shuttle structure having knob assembly

A shuttle structure, comprising:

• a lower housing, comprising a tank and a plurality of hook structures disposed in the tank, wherein a first through via is formed at a center of the lower housing;
• an upper housing, rotatably stacked on the lower housing along an axis, wherein a lower surface of the upper housing comprises an annular hook groove;
• a pushing member, disposed between the upper housing and the lower housing, and comprising a body and a plurality of pushing structures disposed around the body, wherein a screw hole is formed at a center of the body;
• and
• an upper cover, made of a metal material and fixedly disposed on one side of the upper housing opposite to the pushing member;
• a lower cover, made of a metal material and disposed on one side of the lower housing opposite to the pushing member, the lower cover comprising a second through via;
• a screw member, wherein when the screw member is screwed into the screw hole through the second through via and the first through via, the pushing member moves toward and is fixed to the lower housing, and the pushing structures push the hook structures to cause the hook structures to expand outward and be hooked to the annular hook groove of the upper housing, so that the upper housing is limited on the axis by the lower housing;
• and
• at least one metal sheet, disposed on an inner wall of the lower cover and configured to connect the upper cover and the lower cover.