Self-balancing double-hung window apparatus

An apparatus for vertically positioning first and second sashes of a window assembly within the window jamb of a window frame, the apparatus comprising:

• a cable having a first end supporting the first sash and a second end supporting the second sash;
• a pulley supporting the cable;
• a housing supporting the pulley for rotation relative to the housing, the housing including a body portion and a vertically extending rib member projecting outward from the body portion, the rib member aligning with a portion of the window jamb to form a substantially continuous jamb wall;
• a first bracket attached to the first end of the cable and including an upper end and a lower end;
• a second bracket movable relative to the first bracket and configured to support the first sash;
• and
• an adjustment member engaging and extending through the lower end of the first bracket and being movable relative to the first bracket to cause corresponding movement of the second bracket relative to the first end of the cable;
• wherein the second bracket includes first and second members, the first member being configured to support the sash, the second member being fixed relative to the first member;
• and
• wherein the first member slidably engages the first bracket.

A self-balanced double-hung window assembly comprising:

• a window frame including a dividing member defining a first jamb channel and a second jamb channel;
• a first sash movable within the first jamb channel;
• a second sash movable within the second jamb channel;
• a cable having a first end supporting the first sash and a second end supporting the second sash;
• a pulley supporting the cable;
• and
• a housing at least partially disposed within the first and second jamb channels and supporting the pulley for rotation relative to the housing such that rotation of the pulley in a first rotational direction causes corresponding movement of the first sash in a first linear direction and corresponding movement of the second sash in a second linear direction, the housing including a body portion and a rib member extending in a vertical direction substantially parallel to the first and second jamb channels, the rib member being aligned with and abutting the dividing member separating the first and second jamb channels;
• a first bracket attached to the first end of the cable;
• a second bracket movable relative to the first bracket;
• wherein the second bracket includes first and second members, the first member being configured to support one of the first and second sashes, the second member being fixed relative to the first member;
• and
• wherein the first member slidably engages the first bracket.