Patent ID: 8132873
Filing Date: 2012-03-13
Classification: A47B

Abstract:
1. A rail assembly comprising: an outer rail having an outer rail space defined therein for receiving a middle rail, an inner rail, and a retrieving unit; the middle rail sliding in the outer rail space, and having a middle rail space defined therein; the inner rail slide in the middle rail space; the retrieving unit disposed in one end of the outer rail space, comprising: a fixing part, disposed in the outer rail space, and close one end of the outer rail space to a closed end; a sliding rail, disposed on one end of the fixing part, and disposed under the middle rail; the sliding rail having a guiding rail, and the guiding rail having a lean rails formed therein, the lean rails having a hold slot and a slot defined therein; a moving part, disposed on the sliding rail, and sliding along the sliding rail and the guiding rail, and sliding in a free-end of the outer rail space; wherein when the inner rail is pushed inwardly, the middle rail extends into the outer rail space which the moving part is sliding in the sliding rail, so as to increase a sliding scope and a length of the middle rail; a guiding groove disposed at a bottom of the moving part and matched with the guiding rail; a clip, disposed on the moving part and is rotated corresponding to the moving part, the clip having two projections and a jointer formed therein; a guiding member, disposed on the inner rail; when wherein the inner rail is pulled outwardly, the clip slides into the hold slot, the moving part is temporarily fixed by the clip; when wherein the inner rail is pushed inwardly, the guiding member is engaged with the jointer, such that the inner rail and the moving part are connected, so as to drive the moving part to stably slide along the sliding rail; at least one spring, disposed between the fixing part and the moving part; and two receiving slots, respectively disposed between the fixing part and the moving part with the outer rail, when wherein the inner rail slides in the outer rail space, the inner rail spans across the receiving slots and reaches the closed end of the outer rail space, and increase the overall spread length of rail assembly.