Patent ID: 9115531
Filing Date: 2015-08-25
Classification: E05D,E05Y,E06B

Abstract:
1. A covering of a building opening, comprising: a rail having a first end and a second end at opposite ends, wherein the rail is straight from the first end to the second end; a first sash connected to a first axle, wherein the first axle is adjacent to the first end of the rail; a second sash hinged with the first sash, and connected to a second axle, wherein the second axle is engaged with the rail to reciprocate along the rail; wherein the first axle is not on a moving path of the second axle, nor an extending line of the moving path of the second axle; wherein the rail has a front side at a front and a rear side at a rear; wherein the rail is in front of the first axle; wherein the first sash and the second sash can be folded together by moving the second axle in the rail, and the folded first and second sashes are rotatable toward the front side of the rail; wherein when the first sash and the second sash are folded together, the first sash crosses the rail; and wherein when the first sash and the second sash are together rotated to be parallel to an extension direction of the rail, the second sash is just in the extension direction of the rail.