Curtain wall structure

摘要

A curtain wall structure assembled from modular frame assemblies and having an improved four corner joint construction of more than adequate weathertightness. Alignment means is provided for structurally connecting lower head rails in axially aligned relation. Filler strip means and lap strip means cooperate with the alignment means to cap a vertical conduit formed by interlocked mullion sections; and to seal a gap and a space presented between adjacent interlocked head and sill rails thereby providing a wearthertight four corner joint.