Patent ID: 8864249

Claim:
A refrigerator comprising: a main body having a storage chamber; a door slidably mounted to the main body; a first storage unit movable in association with closing and opening operations of the door, each of side walls of the first storage unit having a first roller supporting surface; and a second storage unit having front roller members mounted to a front region of the second storage unit, the front roller members seated on the first roller supporting surfaces of the first storage unit to enable rolling movement thereof, a protrusion extending downwardly from a bottom surface of the second storage unit and configured to prevent the front roller members from laterally leaving the first roller supporting surfaces, and rear roller members provided on both sides of the second storage unit to move along guide surfaces provided on an interior of the storage chamber as the second storage unit is being inserted and withdrawn, the rear roller members being configured to support a rear end of the second storage unit, wherein a rear region of the first roller supporting surfaces of the side walls of the first storage unit includes a stopper member the stopper member being positioned on the first roller supporting surfaces such that the stopper member is spaced a predetermined distance from the respective front roller member when the door is in a closed position, the predetermined distance being configured so that when the door is pulled out up to the predetermined distance, the first storage unit crosses a plane of an opening of the storage chamber to be accessible by a user as the second storage remains in the storage chamber, and when the door is pulled out more than the predetermined distance, the second storage unit crosses the plane of the opening of the storage chamber to be accessible by the user.