Connecting means of curtainwall supporting mullions

Claim 1

A curtainwall structure forming an exterior wall surface defining a X-direction being horizontally perpendicular to said wall surface, a Y-direction being vertically parallel to said wall surface, and a Z-direction being horizontally parallel to said wall surface, said curtainwall structure being supported on at least two spaced apart mullions spanning in said Y-direction, each said mullion being connected to a building frame at at least two locations along said Y-direction using a first connection means and at least one second connection means, said first connection being fixed in both said X-direction and Y-direction, said second connection means being fixed in said X-direction and slidable in said Y-direction, the improvement of said second connection means comprising: (a) a housing clip having at least one web integrally connecting with two spaced apart flanges; (b) said housing clip being firmly fixed to said building frame in said X-direction, Y-direction, and Z-direction, forming a hollow space along said Z-direction, said hollow space being defined by a hollow depth in said X-direction, a hollow height in said Y-direction, and a hollow length in said Z-direction; (c) a holding clip having a width in said Z-direction being larger than said hollow length, a length in said Y-direction being smaller than said hollow height, a depth in said X-direction being smaller than said hollow depth, and having an engaging profile slidable in said Y-direction and fixed in said X-direction and Z-direction along side edge parallel to said Y-direction; (d) said holding clip being secured and fixed in said X-direction within said hollow space where said engaging profiles being positioned out of said hollow space; (e) at least one fastening clip having a slidable engaging profile matched with said engaging profile of said holding clip and an integral fastening flange having a surface parallel to a plane defined by said X-direction and Y-direction; (f) said mullion being firmly fastened to said fastening flange of said fastening clip slidably engaged along the edge of said holding clip.