Expansion variable elder window favor window frame improvement structure

摘要

The present design is that, more particularly produced by the upper frame and the lower frame constituting the lower side horizontal frame of the window frame for a large indoor windows defining a living room and a veranda on a single extrusion die forming on the window frame to improve the structure of the extended variable windows to improve the assembly workability by reducing the cross-inverted stack assembly production costs by enabling the form to sikimyeo, there is a feature that the improved window frame structure of a variable expansion windows to maintain a firm clamping assembly.