| 摘要 |
A counterbalance system for counterbalancing the weight of a window sash in a window frame and the structure of the springs that provide the counterbalance force. Guide tracks are provided on a window frame to guide the movement of the window sash. Mounting slots are formed through the guide tracks at various points. Coil springs are provided to create the counterbalance force. Each coil spring is a coil of wound steel ribbon that has one end bent into an anchor configuration. The anchor configuration passes into, and is retained by, one of the mounting slots. This anchors one end of the coil spring to the guide track. |
