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A rail assembly for a refrigerator is provided. The rail assembly may include a pair of pinions respectively provided in a pair of rails installed on two opposite walls of a storage chamber of a refrigerator. A pair of racks is respectively coupled to the pair of the pinions to guide motion of the p

A rail assembly for a refrigerator is provided. The rail assembly may include a pair of pinions respectively provided in a pair of rails installed on two opposite walls of a storage chamber of a refrigerator. A pair of racks is respectively coupled to the pair of the pinions to guide motion of the pinions. One of the racks includes an extended portion that allows the pinions move without engaging the racks so as to align the drawer door horizontally when a force is applied to a left or right portion of the drawer door coupled to the refrigerator.

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1. A rail assembly for a refrigerator, comprising: a pair of rails, respectively, installed on two opposite lateral walls of a storage chamber;a pair of pinions, respectively, provided in the pair of rails;a pair of racks, respectively, coupled to the pair of pinions to guide motion of the pair of p

1. A rail assembly for a refrigerator, comprising: a pair of rails, respectively, installed on two opposite lateral walls of a storage chamber;a pair of pinions, respectively, provided in the pair of rails;a pair of racks, respectively, coupled to the pair of pinions to guide motion of the pair of pinions; anda handle having a width larger than a distance between the pair of rails, wherein the handle extends longitudinally in a horizontal direction from a drawer door, wherein a first rack of the pair of racks comprises a planar portion configured to allow a first pinion of the pair of pinions to move without engaging the first tack to align the drawer door in the storage chamber when a force is applied to a first or second portion of the drawer door coupled to the storage chamber, wherein the planar portion is provided only at a rear end of the first rack, wherein the handle is fixedly coupled to the drawer door, wherein the first rack is positioned on a right portion of the storage chamber and a second rack of the pair of racks is positioned on a left portion of the storage chamber, and wherein the second rack does not have a planar portion configured to allow a second pinion of the pair of pinions to move without engaging the second rack to align the drawer door in the storage chamber. 2. The rail assembly of claim 1, wherein the first pinion is configured to rotate in the planar portion while the second pinion of the pair of pinions rotates while engaged with the second rack of the pair of racks for a predetermined period of time in response to a force applied to the first portion of the drawer door for movement of the drawer door into or out of the storage chamber. 3. The rail assembly of claim 1, wherein the second pinion of the pair of pinions is configured to not rotate and the first pinion is configured to not rotate and to move to the planar portion at the rear end of the first rack for a predetermined period of time in response to a force applied to the second portion of the drawer door for movement of the drawer door into or out of the storage chamber. 4. The rail assembly of claim 1, wherein a planar surface of the planar portion is spaced apart from a plurality of saw-teeth formed along an outer circumferential surface of the first pinion such that the plurality of saw-teeth does not contact the planar surface when the first pinion is positioned in an extended portion of the first rack. 5. The rail assembly of claim 1, wherein the first pinion corresponding to the first rack is configured to independently perform a rotational motion and a linear motion when positioned in the planar portion of the first rack. 6. The rail assembly of claim 1, wherein the first pinion corresponding to the first rack is configured to perform a linear motion without a rotational motion when positioned in the planar portion of the first rack. 7. The rail assembly of claim 1, wherein the pair of pinions is coupled to each other by a shaft such that the pair of pinions rotate simultaneously and identically. 8. A refrigerator comprising the rail assembly of claim 1. 9. The refrigerator of claim 1, wherein the second rack of the pair of racks comprises a saw toothed portion that includes a plurality of saw teeth that engages with the second pinion. 10. The refrigerator of claim 9, wherein the plurality of saw teeth are formed along an entire length of the second rack. 11. A refrigerator, comprising: a case having a storage chamber provided therein;a pair of rails, respectively, installed on two opposite lateral walls of the storage chamber;a pair of pinions, respectively, received in the pair of rails, the pair of pinions being coupled by a shaft such that rotation of a first pinion of the pair of pinions matches a second pinion of the pair of pinions;a pair of racks, respectively, coupled to the pair of pinions to guide motion of the pair of pinions; anda handle having a width larger than a distance between the pair of rails, wherein the handle extends longitudinally in a horizontal direction from a drawer door, wherein a first rack of the pair of racks comprises an extension configured to allow the first pinion to move without engaging with the first rack, wherein the extension is provided only at a rear end of the first rack, wherein the handle is fixedly coupled to the drawer door, wherein the first rack is positioned on a right portion of the storage chamber and a second rack of the pair of racks is positioned on a left portion of the storage chamber, and wherein the second rack does not have a plant portion configured to allow a second pinion of the pair of pinions to move without engaging the second rack to align the drawer door in the storage chamber. 12. The refrigerator of claim 11, wherein the extension is spaced apart from an outer circumference of the first pinion by a predetermined distance such that the first pinion does not contact the extension when the first pinion is positioned at the extension. 13. The refrigerator of claim 11, further comprising a drawer movably coupled in the storage chamber by the pair of rails, the pair of pinions, and the pair of racks, wherein the first pinion of the pair of pinions is configured to rotate at the extension and the second pinion is configured to rotate and be engaged with the second rack of the pair of racks for a predetermined period of time in response to a force applied to a portion of the drawer corresponding to a position of the first pinion, to move the drawer into or out of the storage chamber. 14. The refrigerator of claim 11, wherein the second rack of the pair of racks comprises a saw toothed portion that includes a plurality of saw teeth that engages with the second pinion. 15. The refrigerator of claim 14, wherein the plurality of saw teeth are formed along an entire length of the second rack.