Self-adjusting shock-absorption device

A self-adjusting shock-absorption device, comprising:

• a movable frame configured to rotate along at least one pivot;
• the movable frame comprises a four-link assembly that comprises a first arm, a second arm, a third arm, and a fourth arm;
• and
• a shock-absorption mechanism, comprising an adjusting component and an elastic component, the adjusting component comprises a first adjusting member and a second adjusting member;
• wherein the first adjusting member is movably connected to the four-link assembly, and the second adjusting member is movably connected to the four-link assembly;
• the elastic component is provided within the four-link assembly, with a first end of the elastic component connected to the first adjusting member, a second end of the elastic component connected to the second adjusting member;
• and
• in response to a rotation of the four-link assembly, the first adjusting member and the second adjusting member undergo dynamic motion to change a length of the elastic component.