Patent ID: 8851589

Claim:
A refrigerator comprising: a cabinet defining a storage space; a first door rotatably mounted on the cabinet, the first door being configured to open and close at least a portion of the storage space and defining an opening through the first door; a second door that is configured to open and close the opening by rotating in a same direction as the first door; and an auxiliary shelf that has both sides shaft-coupled to the opening, the auxiliary shelf contacting a back surface of the second door, being unfolded in a direction crossing a rotation direction of the second door based on the second door opening, and being folded in the direction crossing the rotation direction of the second door based on the second door closing, wherein the auxiliary shelf comprises: a main plate rotatably mounted on the opening; a sub plate disposed on a front side of the main plate and configured to selectively contact the back surface of the second door; a connection member that connects the main plate to the sub plate and that allows the sub plate to rotate relative to the main plate; a guide roller that is disposed on a front end corner of the sub plate adjacent to a rotation axis of the second door; a shelf guide that is disposed on the back surface of the second door, that contacts the guide roller when the second door is closed, and that has an inclined surface configured to guide rotation of the auxiliary shelf; and a plurality of rollers that are disposed on a bottom surface of the sub plate and that, when the second door is closed, contact the back surface of the second door to facilitate smooth rotation of the auxiliary shelf, wherein, upon initial rotation of the second door to close the opening, the guide roller moves along the shelf guide causing the sub plate to rotate, and wherein, as the second door is further rotated to close the opening and further rotate the sub plate, the plurality of rollers contact the back surface of the second door and the auxiliary shelf is further rotated.