| 摘要 |
A hung window includes upper and lower sashes that may operate simultaneously. Two or more pulleys or rollers are mounted at each lateral side of the window frame. A cable interconnects each lateral side of the upper and lower sashes. The cables are routed over the pulleys thereby suspending the sashes and allowing simultaneous movement of the upper and lower sash when force is applied either to raise the lower sash or lower the upper sash. This arrangement allows the hung window to be self-balancing thereby eliminating special hardware typically needed to balance the window. Simultaneous movement of the upper and lower sashes also enables the upper and lower sashes to create openings for increased air circulation within an adjacent room. |
