Patent ID: 8458861

Claim:
A coupling device for coupling an upper container to a lower container, comprising: a body part having an upper part which includes a fastening piece; a lower part which includes a cam part; and a planar coupling plate between the upper and lower parts, wherein the fastening piece is fastenable in a corner piece of the upper container by rotating the body part around a vertical axis (A-A) thereof, and the cam part is adapted to control a vertical motion of the body part and to receive substantially vertical forces between the upper and lower containers, a first rotating locking part rotatably mounted on the cam part, the first rotating locking part being adapted to prevent and release a vertical motion of the body part, and a second rotating locking part rotatably mounted on the fastening piece, the second rotating locking part being adapted to enable and prevent a lateral motion of the body part and to receive the substantially vertical forces between the upper and lower containers, wherein the second rotating locking part is capable of making direct contact with the first rotating locking part so that, when the first rotating locking part rotates, the second rotating locking part is also able to rotate, thereby enabling a locking mode and an unlocking mode.