| 摘要 |
A single-tracked window having slidable doors including a sash, a right door and a left door, wherein the sash comprises an upper frame and a lower fame structured with a groove of a wide groove body and a narrow opening; and each of the doors comprises an upper part, a lower part, an outside jamb and an inside jamb, wherein the inside jambs meeting at the engagement of the doors are both formed to be a wedge shape to match each other, a strip-shaped upper track and lower track respectively positioned in the upper part and lower part of each door at the same side protrude into the relative grooves of the upper frame and the lower frame of the sash, each tack of any one of the door being parallel to the corresponding one of the other door and adjacent to one side of the groove opening; a horizontal returning castor having an elastic arm and a horizontal departing castor are positioned on the front end and rear end of each upper track and lower track at the sides having wide groove body thereof; an erected supporting castor is mounted at the front end and rear end of each lower track; and guiding castors and slant guiding boards are positioned on each upper track and lower rack at the front ends thereof in the engagement between the doors along a wedges the slant guiding boards being parallel and engageable to each other.
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