| 摘要 |
<p>A hybrid sash counterbalance and assist operated window includes a frame having upper and lower sashes slidable within the frame. A sash coupling element extends between the upper and lower sashes. A counterbalance and assist mechanism is coupled with the sash coupling element. The hybrid sash counterbalance and assist mechanism is operable in a sash counterbalance mode and an independent sash movement mode. In the sash counterbalance mode, movement of the upper or lower sash causes converse movement of the lower or upper sash through the sash coupling element, and the movement of the upper or lower sash is assisted by the converse movement. In a first independent sash movement mode, one of the upper and lower sashes is held static while the other of the lower or upper sashes is moved, and the moved sash is assisted by the counterbalance and assist mechanism.</p> |
