Interlocking window framing system

Claim 1

A WINDOW FRAMING SYSTEM UTILIZED IN THE MOUNTING OF AT LEAST ONE PERFORMED PANEL UNIT WITHIN A WALL OPENING, SAID SYSTEM INCLUDING AN ELONGATED FRAMING MEMBER, SAID MEMBER HAVING A WIDE WEB, AN ABUTMENT FLANGE PROJECTING PERPENDICULARLY FROM ONE LONGITUDINAL EDGE OF SAID WEB, THE SECOND LONGITUDINAL EDGE OF SAID WEB HAVING A LONGITUDINALLY EXTENDING RECESS THEREIN OPENING OUTWARDLY OF AND IN GENERALLY THE SAME PLANE AS THE WEB, AND AN INTERMEDIATE FLANGE PROJECTING PERPENDICULARLY FROM SAID WEB ON THE SAME SIDE THEREOF AS THE ABUTMENT FLANGE, SAID INTERMEDIATE FLANGE HAVING THE LONGITUDINAL OUTER PORTION THEREOF RIGHT ANGULARLY BENT SO AS TO GENERALLY PARALLEL THE WEB AND PROJECT TOWARD THE SECOND END OF THE WEB IN A PLANE INWARD OF THE FREE END OF THE ABUTMENT FLANGE AND OUTWARD OF THAT PORTION OF THE WEB DEFINING THE RECESS, SAID OUTER PORTION HAVING THE FREE EDGE THEREOF LOCATED REARWARD OF THE RECESS, AND A LOCKING MEANS ON SAID OUTER PORTION ADJACENT THE FREE EDGE THEREOF, AND A COVER PLATE, SAID COVER PLATE HAVING A STABILIZING FLANGE PROJECTING PERPENDICULARLY FROM ONE LONGITUDINAL EDGE THEREOF AND RECEIVABLE IN THE FRAMING MEMBER RECESS, AND A LOCKING FLANGE OF GREATER WIDTH THAN SAID STABILIZING FLANGE PROJECTING PERPENDICULARLY FROM THE COVER PLATE INWARD OF AND GENERALLY PARALLEL TO THE STABILIZING FLANGE, SAID LOCKING FLANGE BEING POSITIONABLE ADJACENT THE OUTER PORTION OF THE FRAMING MEMBER INTERMEDIATE FLANGE AND INCLUDING LOCKING MEANS ENGAGEABLE WITH THE OUTER PORTION LOCKING MEANS.