Window frame assembly

In a basement window assembly having header, sill and jamb members cooperating with one another to define a window opening, the improvement wherein each of said members comprises;

• (a) a primary sheet metal member having an inner face directed inwardly of the window opening and an outer face directed outwardly of the window opening and first and second side edges extending longitudinally thereof, said primary sheet metal member having a laterally extending wall and a pair oppositely disposed arms projecting outwardly from the laterally extending wall and cooperating therewith to provide a generally U-shaped cross-sectional configuration, said laterally extending wall being formed to provide a laterally extending window mounting seat on the inner face thereof, seat being spaced inwardly from each side edge of the primary and an angularly inclined portion which extends inwardly from the first side edge to said seat;
• and,
• (b) a secondary sheet metal member comprising a laterally extending wall having a pair of oppositely disposed arms projecting at right angles from opposite ends thereof to provide a generally U-shaped configuration, said arms each having an outer edge which is welded to the outer face of the primary sheet metal member such that the secondary sheet metal member is integrally connected to and arranged to bridge a wide laterally extending portion of the primary sheet metal member with the laterally extending wall arranged in a spaced relationship with respect to the outer face of the primary sheet metal member and extending in the plane of the outer edge of the arms of the primary sheet metal member so as to be within the confines of the U-shaped configuration of the primary sheet metal member to cooperate therewith to form a rigid box section having a section modulus which is substantially greater than that of the primary sheet metal member alone.