| CPC E05B 83/32 (2013.01) | 9 Claims |

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1. A rail locking device in a rail structure having a mounting area provided in one of two rails, a first rail and a second rail being coupled to each other and the first rail being configured to slide along the second rail, the rail locking device comprising:
a moving cover portion mounted in the mounting area and configured to extend from the mounting area; and
a locking portion configured to selectively limit extraction of the moving cover portion to temporarily fix the first rail that slides forwards or rearwards of the second rail in place,
wherein the locking portion is further configured to:
selectively limit the extraction of the moving cover portion at a rear of the second rail based on an occurrence of a forward impact, and
selectively limit the extraction of the moving cover portion at a front of the second rail based on an occurrence of a rearward impact.
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