Patent ID: 7481026

Claim:
A window assembly comprising: a window frame having a lower portion and a pair of opposite side portions, each of said side portions including an inner surface comprising a substantially planar surface; a window sash constructed to be positioned within said window frame and capable of moving from a closed position to an open-tilted position and vice versa; a pair of parallel pivot pins on said window sash, each of said pair of parallel pivot pins comprising only a single such pivot pin on each side of said window sash; and a pair of kidney shaped receptacles each including a curved upper end and a curved lower end, and comprising slots within each of said pair of opposite portions of said window frame for accepting each of said pair of parallel pivot pins to thereby accommodate movement of said window sash from said closed position to said open-tilted position and vice versa, each of said slots being formed within said window frame so as not to project beyond said substantially planar surface thereof, said curved upper and lower ends of said pair of kidney shaped receptacles defined by upper and lower radii defining the curvature of said upper and lower curved ends of said kidney shaped receptacles.