Patent attributes
A counterbalance system for a tilt-in window and its associated method of operation. The system uses wound spring elements to provide a counterbalancing force to the sashes of the window. The wound springs are configured to define open central regions. Hubs are attached to tilt posts that extend from the sashes of the window. The hubs extend into the open central regions of the wound springs, thereby supporting the wound springs within the frame of the window. A brake structure is disposed between the wound springs and the tilt posts. The brake structure creates multiple braking actions. First, the brake structure itself creates an interference fit within the frame of the window as the sashes tilt. Second, the brake structure displaces the wound spring and causes the wound spring to press against the frame of the window as the sashes tilt.
