| 摘要 |
<p>A heat-insulating roller-blind is described, which is intended to be placed in f ront of a window in order to save energy in buildings. The blind consists of two thin , transparent, hermetic, congruent sheets which at their outer edges are hermetica lly joined to form an enclosed space. A valve is arranged to enable introduction of room air, while in an open position into the space and when the valve is closed to fo rm a non-circulating, heat-insulating air-layer of greater than atmospheric pressure between the sheets. In the open position, the valve permits the out-flowing of the air f rom the space when the blind is rolled up. The roller-blind may be retained in the down position without distorting the view through the window while at the same time providing an increased insulating effect.</p> |
