Patent ID: 7354058

Claim:
A folding structure of a carrier, which is disposed between two connection members of the carrier, said folding structure comprising: a base frame having a pivot point; an extension support unit having a first end connected to said base frame through said pivot point; and an expansion unit having a first end connected to said base frame and a second end connected to said extension support unit, wherein said extension support unit is located in an extended position or a compact position using force provided by said expansion unit, with the expansion unit further including an expansion link and a body, with the expansion link moveable inward and outward of the body, wherein when said extension support unit rotates upward or downward, the expansion link of said expansion unit is shifted from inward to outward after said expansion unit passes through an angle of over-tangency, and thereby said extension support unit is moved to the extended position or the compact position spontaneously.