Window assembly with movable interior sash

A window assembly having an interior side and an exterior side, the window assembly comprising:

• a window frame;
• a primary sash mounted in the window frame, the primary sash having a plurality of sash members forming a primary sash perimeter and a first glazing panel mounted in the primary sash perimeter;
• a secondary sash having a plurality of secondary sash members forming a secondary sash structure and a second glazing panel mounted in the secondary sash structure, the secondary sash pivotally attached directly to the primary sash perimeter along an interior surface thereof by one or more hinge members forming a hinge between the primary sash structure and the secondary sash structure so that the secondary sash is rotatably movable between a closed position and an open position relative to the primary sash, the secondary sash being hinged to open toward the interior side of the window assembly, the hinge adapted to be disengaged upon pivoting and shifting the secondary sash relative to the primary sash from a first position to a second position;
• an air chamber located between the primary sash and the secondary sash when the secondary sash is in the closed position;
• an accessory channel located in at least one side of the secondary sash members;
• a window accessory operating mechanism coupled to at least one of the secondary sash members;
• at least two window accessory mounting structures located in the air chamber and attached to a top sash member forming the secondary sash structure, the mounting structures separated by a fixed distance;
• and
• a window accessory comprising a shade mechanism housing with first and second slots separated by the fixed distance, the first slot extending generally parallel to an axis of the shade mechanism housing and the second slot extending generally perpendicular to the axis of the shade mechanism housing.