Sealed frame cross joint

Claim 1

A SEALED JOINT IN A WALL STRUCTURE COMPRISING: (A) AN EXTRUDED VERTICAL MEMBER FORMED OF AN EXTERIORLY DISPOSED TUBULAR BOX SECTION JOINED BY AN INTEGRAL WEB TO A REAR WALL, RECESSES BEING DEFINED ON EACH SIDE OF SAID WEB BETWEEN SAID BOX SECTION AND REAR WALL TO RETAIN THE SIDE EDGES OF WALL PANELS TO BE SUPPORTED THEREIN, (B) FLANGE MEANS INTEGRALLY FORMED ON THE REAR SIDE OF SAID BOX SECTION ON EACH OF SIDE OF SAID WEB ADJACENT SAID RECESSES DEFINING WITH SAID REAR SIDE OF SAID BOX SECTION U-SHAPED CHANNELS RETAINING SEAL, (C) A SLOT PROVIDED IN EACH FLANGE MEANS COMMUNICATING WITH EACH CHANNEL, (D) AN EXTRUDED T-SHAPED HORIZONTAL MEMBER DEFINED BY A PANEL SUPPORTING WEB AND A CROSS BAR AT ONE END THEREOF HAVING A CROSS-SECTION SUBSTANTIALLY IDENTICAL TO THE CONFIGURATION OF SAID SLOT, SAID HORIZONTAL MEMBER BEING DISPOSED NORMAL TO SAID VERTICAL MEMBER WITH ONE END THEREOF EXTENDING INTO THE ADJACENT RECESS OF SAID VERTICAL MEMBER WITH SAID CROSS BAR POSITIONED SNUGLY IN SAID SLOT TO FORM SAID JOINT, (E) AND A COMPRESSIBLE-EXPANDABLE SEAL RETAINED IN SAID CHANNEL, A PORTION OF SAID SEAL EXTENDING THROUGH SAID SLOT AND EXERTING PRESSURE AGAINST SAID CROSS BAR AND THEREBY FORMING A TIGHT, SEALED JOINT BETWEEN SAID VERTICAL AND HORIZONTAL MEMBERS.