Window construction

Claim 1

A RIGID METAL WINDOW FRAME ADAPTED TO BE PERMANENTLY AND RIGIDLY MOUNTED IN AN OPENING IN A SUPPORTING WALL, SAID FRAME BEING FORMED OF A STRIP OF METAL PLATE BENT TO PROVIDE A TUBULAR OUTER FRAME SECTION AND AN INTEGRAL INWARDLY EXTENDING WEB, SAID TUBULAR OUTER FRAME SECTION HAVING AN INNER FACE EXTENDING FROM THE OUTER EDGE AND ON OPPOSITE SIDES OF SAID WEB SO THAT, WHEN THE FRAME IS MOUNTED IN THE OPENING IN THE SUPPORTING WALL, PORTIONS OF THE INNER FACE OF SAID TUBULAR OUTER FRAME SECTION OVERLIE MARGINAL PORTIONS OF THE OUTSIDE FACE OF THE SUPPORTING WALL AND OUTER PORTIONS OF SAID WEB ARE ADJACENT TO AND FACE THE EDGE OF THE SUPPORTING WALL, SAID WEB BEING FORMED FROM THE SIDE MARGINAL PORTIONS OF THE METAL PLATE AND SAID MARGINAL PORTIONS BEING DISPOSED IN FACE CONTACTING RELATION SO THAT SAID WEB IS OF A DOUBLE THICKNESS METAL PLATE AND TRANSVERSELY ELONGATED INTO THE OPENING, THE EDGE PORTIONS THEREOF BEING BENT IN OPPOSITE DIRECTIONS TO FORM ABUTMENT SHOULDERS EXTENDING FROM THE OPPOSITE FACES OF SAID WEB, SAID WEB AND SAID INNER FACE OF SAID TUBULAR FRAME SECTION FORMING CHANNELS FOR RECEIVING A GLAZING ASSEMBLY AND SAID SUPPORTING WALL, RESPECTIVELY.