Full-opening window linkage assembly

In an improved window assembly having a fixed window frame and a mating moveable window sash which can be opened and closed in relation to said window frame, the improved linkage means for opening said window by translating and rotating said sash away from said window frame, comprising:

• a frame track member affixed to the window frame;
• a moveable support member for supporting the sash;
• said moveable support member being connected to the frame track by an upper and lower linkage means, the upper linkage being pivotally connected between the upper portion of the frame track member and the top portion of said moveable support member, and the lower linkage means having one end pivotally connected to the moveable support member and the other member slidably connected to said frame track member;
• a stabilizing member, one end of which is pivotally connected to the track member and the other end pivotally connected to the lower linkage;
• and
• whereby the linkage means allows the moveable sash to both translate and rotate away from said stationary window frame providing, on one hand, firm sealing in the closed position and, on the other hand, the maximum open space possible for escape in the open position.