Patent ID: 8371068

Claim:
A method of decreasing friction in a counterbalance system for a tilt-in window, comprising: providing guide tracks, wherein each of said guide tracks has two opposing vertical walls spaced a predetermined distance apart; providing a window sash having tilt posts that extend outwardly therefrom, wherein said window sash is rotatable about said tilt posts between an operational orientation and a tilted orientation; providing brake shoes within said guide tracks, said brake shoes receiving said tilt posts and guiding said tilt posts within said guide tracks, wherein each of said brake shoes has a housing having two curved side edges that include a first curved side edge and a second curved said edge, and wherein each of said brake shoes has a face surface and a rear surface disposed between said two curved side edges; providing a cam disposed between said face section and said rear section within each of said brake shoe, wherein said cam biases said face section and said rear section apart when said sash is tilted from said operational orientation to said tilted orientation; and providing coil springs, wherein said coil springs have free ends that connects to said brake shoes said grooves, wherein said coil springs apply torque to said brake shoes to bias said first curved side edge and said second curved side edge of each of said brake shoes into tangential contact with said opposing vertical walls of said guide tracks.