Window assembly having a removable sash therein

Claim 1

IN A WINDOW ASSEMBLY, AN UPPER AND LOWER SASH WITH A PAIR OF VERTICALLY EXTENDING METAL SIDE RAILS ON EACH SASH AND EACH SIDE RAIL HAVING A LATERALLY OUTWARDLY EXTENDING FLANGE THEREON, VERTICALLY EXTENDING METAL SIDE STILES ADAPTED TO BE POSITIONED IN A FRAME OF A DOUBLE HUNG WOOD WINDOW WITH THE WINDOWS AND CENTER STOP THEREIN REMOVED, SAID SIDE STILES HAVING EDGE FLANGES THEREON FOR ENGAGING INNER STOPS OF A WOOD WINDOW, A LONGITUDINALLY FLEXIBLE TRACK HAVING A PAIR OF PARALLEL LATERALLY INWARDLY OPEN SASH RAIL FLANGE ENGAGING RECESSES THEREIN OPERATIVELY ENGAGED WITH EACH OF SAID SIDE STILES FOR MOVEMENT LATERALLY OF THE WINDOW AT ALL PORTIONS OF A HORIZONTAL SECTION OF SAID TRACK, AND COMPRESSIBLE MEANS POSITIONED IN SAID SIDE STILES AND URGING SAID TRACKS LATERALLY INWARDLY, ONE OF SAID SASHES BEING WIDER THAN THE OTHER, SAID TRACKS DIVERGING TOWARDS THE INNER SURFACE OF THE WINDOW ASSEMBLY BETWEEN SAID SASH RAIL FLANGE ENGAGING RECESSES AND WITH THE SAID WIDER ONE OF SAID SASHES BEING THE INNER SASH, THE DIVERGENCE OF SAID TRACKS FACILITATING REPLACEMENT OF SAID SASHES AND REMOVAL THEREOF BY SPRINGING AT LEAST ONE OF SAID TRACKS LATERALLY OUTWARDLY OF THE WINDOW ASSEMBLY.