Patent ID: 8157096

Claim:
A foldable air cushion, comprising: a main air tube piece comprising a main body and at least one buffer wall connected to the main body, and having a first end and a second end opposite to the first end; at least one side air tube piece, located at a side of the main air tube piece, the side air tube piece comprising a side body, and a folding portion connected to the side body, and having a first end and a second end opposite to the first end; a pneumatic passage comprising a pneumatic hole and disposed adjacent to the first end of the main air tube piece and the first end of the side air tube piece; each of the first end of the main air tube piece and the first end of the side air tube piece having a check valve disposed therein, the check valve individually connecting a respective one of the main air tube piece or the side air tube piece with the pneumatic air passage, allowing air to be filled in the pneumatic passage via the pneumatic hole, the air in the pneumatic passage concurrently entering and expanding the main air tube piece and the side air tube piece, and individually sealing each respective main air tube piece and side air tube piece, preventing the main air tube piece and the side air tube piece from leaking air; a bending line, located between the main body and the buffer wall, and the side body and the folding portion; a folding line, located between the main air tube piece and the side air tube piece; and a folding area, located on the side air tube piece and at the intersection of the bending line and the folding line, the folding area having a polygonal or irregular shape, wherein a vertex of the polygonal or irregular shape intersects at the intersection of the bending line and the folding line, said folding area having a width smaller than the width of the side air tube piece and being sealed around its entire periphery so as to be free of an air entrance that communicates between the folding area and the side air tube piece adjacent thereto; wherein air is filled into the side air tube via the pneumatic passage and the check valve through a gap formed by the difference in widths between the folding area and the side air tube piece, the main air tube piece is bent along the bending line, the side body of the side air tube piece is folded along the folding area, and the side air tube piece is folded along the folding line, thereby forming a containing space between the main air tube piece and the side air tube piece.