Abstract: The present invention is a retractable screen (22) and frame (24) assembly (20). The frame (24) includes a first track (32) and a second track (34) in spaced and parallel relationship to the first track (32). The retractable screen (22) includes a canister (36), a screen cloth (38), a control bar (40), a first glide (42), a second glide (44), and a biasing device (46). The biasing device (46) is disposed between a first end (52) of the control bar (40) and the first glide (42). The first glide (42) is inserted into the first track (32) and the second glide (44) is inserted into the second track (34). The glides (42, 44) slide along the respective tracks (32, 34) while the biasing device (46) biases the first end (52) of the control bar (40) with respect to the first track (32). The biasing provided by the biasing device (46) prevents the control bar (40) from binding with the tracks (32, 34) as the control bar (40) and the glides (42, 44) are slid along the tracks (32, 34).

Abstract: An improved vertically slidable pivotal window unit having a spring loaded jamb latch assembly which provides a mechanically positive latching and release mechanism in going from the vertically displaceable to horizontally pivotal sash opening and closing modes.

Abstract: A window conversion assembly is provided for use with a building window frame having a head jamb, opposed side jambs, and a bottom sill, the window assembly including a headpiece for mounting against the head jamb of the frame, a sill piece for mounting against the sill of the frame, with one or both of the headpiece and sill piece being resiliently mounted against the frame for accommodating any out-of-squareness of the frame, side members for mounting against the side jambs of the frame, and upper and lower sash windows for mounting within the headpiece, sill piece and side members to form a completed window assembly. The window assembly features full perimeter weather-stripping, utilizing high leaf weather-strips and corresponding deep receiving grooves in the windows to provide weather seals along the horizontal as well as vertical junctures between the window sashes and frame assembly members.