Patent ID: 6988334

Claim:
A window assembly comprising a frame and a sash, the sash having a lower end pivotally secured by a sash pivot within the frame and having an upper end releasable from the frame to enable tilt opening of the sash, the sash aligning with the frame when the sash is tilted closed and the upper end of the sash moving downwardly and outwardly away from the frame as the sash is tilted open, said assembly further including a sash tilt control system which comprises an elongated slot in the sash, a control arm having a first end pivotally held by an arm pivot within the frame and having a second end in the slot in the sash, the system further including a spring trapped in the slot in the sash, the second end of the control arm sliding, against resistance from the spring, along the slot as the sash is tilted open, the resistance provided by the spring increasing at increased tilt angles of the sash relative to the frame.