Thermal barrier and connector member for inner and outer window frames

Claim 1

IN A THERMAL BARRIER AND CONNECTOR FOR INNER AND OUTER WINDOW FRAMES, A PREFORMED ELONGATED BODY MEMBER HAVING LONGITUDINAL RIGIDITY AND A FIXED LONGITUDINALLY EXTENDING INTERNAL RECESS, SAID BODY MEMBER HAVING A FIXED LONGITUDINALLY EXTENDING OPENING LEADING INTO SAID INTERNAL RECESS, THE WIDTH OF SAID LONGITUDINALLY EXTENDING OPENING BEING LESS THAN THE WIDTH OF SAID INTERNAL RECESS, THE OUTER WALL SURFACES OF SAID BODY MEMBER FORMED WITH LONGITUDINALLY EXTENDING GROOVES DEFINING LONGITUDINAL OUTER CORNER EDGES, SAID INTERNAL RECESS ADAPTED TO RECEIVE AN ENLARGED PORTION OF AN EXTENSION MEMBER OF AN OUTER WINDOW FRAME WITH THE EXTENSION MEMBER EXTENDING FROM THE ENLARGED PORTION OUTWARDLY FROM THE INTERNAL RECESS THROUGH THE LONGITUDINALLY EXTENDING OPENING, THE WIDTH OF SAID LONGITUDINALLY EXTENDING OPENING BEING LESS THAN THE WIDTH OF THE ENLARGED PORTION OF THE EXTENSION MEMBER, SAID BODY MEMBER ADAPTED FOR ENDWISE INSERTION INTO AN ELONGATED PARTIAL BOX CONSTRUCTION OF AN INNER WINDOW FRAME WITH SAID OUTER CORNER EDGES OF SAID BODBY MEMBER IN PRESSING CONTACT WITH THE INTERNAL SURFACE OF THE PARTIAL BOX CONSTRUCTION WHEN THE SAME IS INSERTED THEREIN TO THEREBY CONNECT THE FRAMES TOGETHER WITH DIMENSIONAL STABILITY AND SUBSTANTIALLY INSULATE ONE FROM THE OTHER.