Screen frame corner connector key

Claim 1

In a screen frame corner construction formed of a pair of elongated, thin wall, open-ended tubular frame members arranged at right angles to each other, with a corner connector key arranged between and having perpendicularly arranged integral legs that are telescopically fitted within adjacent member end portions, the improvement comprising: the transverse cross-sectional shape of each frame member being substantially uniform along a full length of said member and including a generally rectangular tubular portion defined by exterior and interior dimensions, a generally U-shaped groove for receiving the peripheral edge of screening material to be assembled to the screen frame, and a pocket opening into and forming an extension along one side of the interior of said rectangular porton; said corner connector key comprising a corner portion at the intersection of said integral legs, the exterior transverse cross-sectional shape of said corner portion being shaped and dimensioned to be the same as that of the exterior of said rectangular tubular portion of said frame members; the exterior cross-sectional shape of said integral legs being shaped and dimensioned to be substantially the same as said interior dimensions of said frame member rectangular tubular portion so as to be snugly but slidably insertable therein in telescoping fashion. said corner connector key having circumferential shoulders located where larger exterior dimensions of said corner portion meet smaller exterior dimensions of said integral legs, said shoulders defining a positive stop for the ends of said frame members which limits the insertion length of said integral legs into said frame members; each of said integral legs further having a flange extending continuously along one longitudinal side thereof, said flange being dimensioned and positioned to be snugly telescopically received within said pocket of said frame member when said leg is inserted therein, and said flange also extending longitudinally beyond the end of said leg remote from said corner portion to form a guide to assist in aligning said leg with said frame member during insertion; and said corner connector key further having a post aligned with said shoulders but spaced therefrom to define therebetween a pair of perpendicularly intersecting grooves which are aligned with said U-shaped grooves of said frame members, whereby a continuous groove is formed around the full periphery of an assembled screen frame, said post also functioning as an abutment for both fully inserted frame member; whereby the snug fit of said corner connector key legs within said frame members, coupled with the abutment of the ends of said frame members against said shoulders and said post rigidifies the assembled screen frame.