| 摘要 |
<p>The roller blind covers openings in buildings so as to keep out insects, being mounted on a coiling shaft spring-loaded by a torsion spring in the unwinding direction. The shaft is mounted in a box-shaped housing detachable from holders at the top edge of the opening, while at the free end of the blind is a strip detachably engaging with other holders at the lower edge of the opening. The housing has a controllable locking device for the shaft, and the end strip has controllable clamps, spring-loaded against a holder. FL.</p> |
