Abstract: A foldable nail fin for a window comprising an inner end which is normally positioned in a kerf formed in the window frame. The nail fin is normally positioned in a substantially flush condition with respect to the window frame. At the building site, the nail fin may be folded from its substantially flush position to an outwardly extending position so that the nail fin may be secured to a building surface extending around a window opening formed therein. The folding of the nail fin is enhanced through the use of a fold line formed in the nail fin which is located closely adjacent the inner end thereof.

Abstract: A cam pivot for a full tilt, double-hung window comprising a locking lug which extends from the cam pivot and which is received between the walls of a channel-shaped slide member which is a part of a mechanical balance. The locking lug, when the sash is tilted to its vertical position, prevents separation of the cam pivot from its locking terminal during shipment or when loading.

Abstract: A single hung window jamblinder is utilized in combination with a window frame having a pair of vertical jambs, the jambs having a vertical, generally T-shaped pocket therein. The jambliner includes an elongated channel member having a base portion and a pair of upstanding sides, and a pair of leg portions mounted on the channel member sides which will receive the stile of a sash and allow for slidable movement of the sash therealong. A resilient vinyl layer is secured along the channel base, and is wider than the channel base so as to protrude beyond each side of the base. The vinyl layer will have a width substantially equal to the width of the jamb pocket to retain the jambliner in position in the jamb. A resiliently compressible sponge-like pad is mounted on the vinyl layer, and is thick enough to bias the vinyl layer against the edges of the jamb pocket so as to prevent airflow between the jamb pocket and the exterior of the jamb.