| 摘要 |
<p>A curtain rod or rail (6) is provided with a spiral convex (7) on the allover outer circumference thereof with opposite windings at the both ends of the rod, on which rings (8) are mounted for suspending a curtain (9) and movable over the spiral convex (7). The rail is rotatably driven by an electric motor (2), and the rings (8) run idle thereon, though the curtain is closed or opened while the motor is still runningf so that no overload is not effected on the electric motor (2).</p> |
