A rolling module structure and a method for use therewith are introduced. The rolling module structure includes a carrier and at least one rolling member. The rolling member is fitted to the carrier to form a rolling module structure. The rolling module structure is fitted to a moving target, allowing the moving target to move smoothly because of the rolling member.

A sliding device is capable of decreasing a moving distance of a middle rail while maintaining a maximum moving distance of a movable rail. The sliding device includes a fixed rail fixed to a body into which a storage body is inserted, the movable rail fixed to the storage body, the middle rail installed between the movable rail and the fixed rail and configured to move relatively with respect to the movable rail and the fixed rail, and a driving part configured to move the middle rail so as to move the movable rail by a distance twice a moving distance of the middle rail.

A sliding device is capable of decreasing a moving distance of a middle rail while maintaining a maximum moving distance of a movable rail. The sliding device includes a fixed rail fixed to a body into which a storage body is inserted, the movable rail fixed to the storage body, the middle rail installed between the movable rail and the fixed rail and configured to move relatively with respect to the movable rail and the fixed rail, and a driving part configured to move the middle rail so as to move the movable rail by a distance twice a moving distance of the middle rail.

A server chassis includes an outer case including a plurality of outer shells and an insertion space. The outer shell has an inner wall, and an outer rail structure is disposed on the inner wall of the outer shell. The outer rail structures including an outer rail-plate, an outer-rail and a set of ball slide rail. A chassis body is slidably coupled to the insertion space. The chassis body includes inner shells and an accommodating space. An inner rail structure includes an inner rail-plate, and the chassis body is capable of sliding with respect to the outer case through the inner rail-plate inserted in the outer-rail.

A server chassis includes an outer case including a plurality of outer shells and an insertion space. The outer shell has an inner wall, and an outer rail structure is disposed on the inner wall of the outer shell. The outer rail structures including an outer rail-plate, an outer-rail and a set of ball slide rail. A chassis body is slidably coupled to the insertion space. The chassis body includes inner shells and an accommodating space. An inner rail structure includes an inner rail-plate, and the chassis body is capable of sliding with respect to the outer case through the inner rail-plate inserted in the outer-rail.

A refrigerator includes a cabinet including an inner case, and a drawer assembly installed in the inner case. The drawer assembly includes a basket which forms a receiving space and can be pulled in and out of the inner case, a supporter assembly connected to the basket to guide an insertion or withdrawal of the basket, and a cover connected to the supporter assembly to cover or uncover the receiving space. The cover may be movable in a direction opposite to a movement of the basket when the basket is inserted or withdrawn. The basket includes a protrusion configured to engage with or disengage from a notch of a connection member to facilitate or prevent transmission of a movement force of the basket to the cover.

A refrigerator includes a cabinet including an inner case, and a drawer assembly installed in the inner case. The drawer assembly includes a basket which forms a receiving space and can be pulled in and out of the inner case, a supporter assembly connected to the basket to guide an insertion or withdrawal of the basket, and a cover connected to the supporter assembly to cover or uncover the receiving space. The cover may be movable in a direction opposite to a movement of the basket when the basket is inserted or withdrawn. The basket includes a protrusion configured to engage with or disengage from a notch of a connection member to facilitate or prevent transmission of a movement force of the basket to the cover.

A refrigerator includes a cabinet including an inner case, and a drawer assembly installed in the inner case. The drawer assembly includes a basket which forms a receiving space and can be pulled in and out of the inner case, a supporter assembly connected to the basket to guide an insertion or withdrawal of the basket, and a cover connected to the supporter assembly to cover or uncover the receiving space. The cover may be movable in a direction opposite to a movement of the basket when the basket is inserted or withdrawn. The basket includes a protrusion configured to engage with or disengage from a notch of a connection member to facilitate or prevent transmission of a movement force of the basket to the cover.

A refrigerator includes a cabinet including an inner case, and a drawer assembly installed in the inner case. The drawer assembly includes a basket which forms a receiving space and can be pulled in and out of the inner case, a supporter assembly connected to the basket to guide an insertion or withdrawal of the basket, and a cover connected to the supporter assembly to cover or uncover the receiving space. The cover may be movable in a direction opposite to a movement of the basket when the basket is inserted or withdrawn. The basket includes a protrusion configured to engage with or disengage from a notch of a connection member to facilitate or prevent transmission of a movement force of the basket to the cover.

An embodiment of the present invention provides a pull-out system comprising: at least two slide rails each having a fixed rail, a middle rail slidably arranged on the fixed rail, and a movable rail slidably arranged on the middle rail; and a synchronization means for synchronizing the movement of the movable rail, wherein the synchronization means comprises a roller unit, a synchronization bar connected to the roller unit, and a deflectable element having an end portion fixe to the roller unit and an opposite end portion connected to the movable rail, and the movable rail is configured to move as much as the amount of rotation of the roller unit.