Patent ID: 7117636

Claim:
A hung window comprising: a frame defining an opening, said frame including a pair of spaced vertical frame members, an upper frame member interconnecting upper ends of said vertical frame members, and a lower frame member interconnecting lower ends of said vertical frame members, each said vertical frame member having a pair of vertically extending channels formed thereon, said channels being defined by a pair of exterior frame elements and an intermediate frame element positioned between the pair of exterior frame elements and said intermediate frame element separating said pair of channels; an upper sash mounted in the frame and slidable in an opposing pair of said channels; a lower sash mounted in the frame and slidable in another opposing pair of said channels; a pair of pulleys secured to the frame, one pulley of said pair of pulleys being mounted in one channel of said pair of channels, and the other pulley of said pair of pulleys being mounted in the other channel of said pair of channels, said pulleys being laterally offset from and separated from lateral edges of said sashes; and a cable having a first end connected to the upper sash and a second end connected to the lower sash, said cable being routed over said pair of pulleys wherein lifting said lower sash causes said upper sash to be lowered.