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Claim 1

IN A SCREEN SASH, A BASE FRAME COMPRISED OF RIGHT ANGULARLY END TO END CONNECTED RAILS DEFINING A GENERALLY RECTANGULAR PERIPHERY ENCOMPASSING A CENTRAL OPENING, EACH SAID RAIL BEING AN EXTRUDED SECTION HAVING A MAIN WALL PORTION DISPOSED TO EXTEND IN THE PLANE OF THE FRAME AND HAVING INTEGRAL MEDIAL WED STRUCTURE AND INTEGRAL INNER AND OUTER EDGE WEB STRUCTURES EXTENDING LENTHWISE ALONG A COMMON FACE THEREOF AND PROJECTING GENERALLY NORMAL FROM SAID FACE, SAID INNER WEB STRUCTURE AND SAID MEDIAL WEB STRUCTURE COOPERATIVELY DEFINING A LENGTHWISE ELONGATED MOUNTING POCKET HAVING A FULL LENGTH ENTRANCE ALONG THE INNER PERIPHERY OF SAID FRAME RAIL, A SCREEN SPANNING SAID OPENING AND HAVING CORRESPONDING MARGINAL EDGE PORTIONS FOR ENGAGEMENT IN SAID RAILS, WITH EACH SCREEN EDGE PORTION EXTENDING THROUGH SAID ENTRANCE AND LINING SAID POCKET TO SUBSTANTIALLY FOLLOW THE OUTLINE CONFIGURATION THEREOF, AND MEANS FOR FASTENING SAID SCREEN EDGE PORTIONS IN SAID RAIL POCKETS AND INCLUDING A SEPARATE MOLDING STRIP FOR EACH RAIL AND EACH COMPRISING AN EXTRUDED SECTION HAVING A MAIN WALL PORTION EXTENDINGG SUBSTANTIALLY FULL LENGTH WITH THE RAIL MAIN WALL PORTION AND HAVING INTEGRAL MEDIAL WEB STRUCTURE AND INTEGRAL OUTER EDGE WEB STRUCTURE EXTENDING LENGTHWISE ALONG A COMMON FACE THEREOF AND PROJECTING GENERALLY NORMAL THEREFROM, WITH THE OUTER WEB STRUCTURES OF SAID RAIL AND STRIP HAVING COMPLEMENTARY INTERENGAGEABLE SURFACES WHEREIN THE LASTNAMED STRIP SURFACE FACES GENERALLY OUTWARDLY AND THE LAST-NAMED RAIL SURFACE IS OUTWARDLY OF SUCH LAST-NAMED STRIP SURFACE AND FACES GENERALLY INWARDLY THEREAGAINST,