Weep hole construction for windows and the like

Claim 1

IN A WINDOW FRAME INCLUDING A SILL HAVING AN OUTWARDLY DOWNWARDLY SLOPING UPPER SURFACE AND AN UPRIGHT FIXED FLANGE DISPOSED LONGITUDINALLY ON THE UPPER SURFACEOF SAID SILL AND GENERALLY LATERALLY TO SAID SLOPING SURFACE, A WEEP HOLE CONSTRUCTION COMPRISING: AT LEAST ONE APERTURE PROVIDED WITHIN THE LOWER SURFACE OF SAID FIXED FLANGE, SAID APERTURE MEETING WITH THE SLOPING UPPER SURFACE OF SAID SILL; A LONGITUDINALLY RECESSED CHANNEL PROVIDED IN THE OUTER SURFACE OF SAID FLANGE AND SPACED APART A PREDETERMINED DISTANCE ABOVE AN UPPER EDGE OF SAID APERTURE; AN UNDERCUT AREA PROVIDED BELOW SAID CHANNEL IN SAID FLANGE; AND FLEXIBLE APERTURE SEALING MEANS SUBSTANTIALLY WIDER THAN THE WIDTH OF SAID APERTURE ENGAGING SAID CHANNEL AND SEATING WITHIN SAID UNDERCUT AREA TO PROVIDE A PAIR OF PIVOT AXES ABOUT WHICH SAID SEALING MEANS MOVES OUT OF AND INTO SAID APERTURE, ONE AXIS BEING ADJACENT TO SAID CHANNEL AND THE OTHER AXIS BEING ADJACENT SAID UPPER EDGE OF SAID APERTURE, WHEREBY THE DEFLECTION RESISTANCE OF SAID SEALING MEANS TO LIQUID PASSING OUTWARDLY THROUGH SAID APERTURE IS CONSIDERABLY LESS THAN THE DEFLECTION RESISTANCE TO MATERIALS ATTEMPTING TO PASS INWARDLY THROUGH SAID APERTURE.