Window structure

A window structure comprising:

• a generally rectangular left sash having top, bottom, left side and right side sides;
• a first window pane mounted in said left sash;
• a generally rectangular right sash having top, bottom, left side and right side sides;
• a second window pane mounted in said right sash;
• a window frame having a right side, a left side, a top portion, and a bottom portion defining a window aperture and supporting said left and right sashes in each of a plurality of positions including respective closed positions wherein said left and right sashes are in side-by-side relation to completely close said window aperture with said right side of said left sash confronting said left side of said right sash;
• said left sash being independently slidable rightward within said frame away from the closed position to an open-left position to present an opening between said frame and said left side of said left sash;
• said right sash being independently slidable leftward within said frame away from the closed position to an open-right position to present an opening between said frame and said right side of said right sash;
• said left sash, with said left side thereof abutting said left side of said frame, being independently pivotal about its left side to a first open-center position wherein said left side of said left sash is spaced away from said frame;
• said right sash, with said right side thereof abutting said right side of said frame, being independently pivotal abut its right side to a second open-center position wherein said left side of said right sash is spaced away from said frame;
• and
• said left sash at said first open-center position and said right sash at said second open center position presenting an unobstructed opening between the right and left sides of the window frame, and the top and bottom portions aperture of said window frame.