| 摘要 |
A curtain driving means for drawing curtains (14, 16) to and fro relative to a window opening (Fig. 1, 10) comprises, when assembled in position adjacent such an opening (10), a continuous, curtain-driving loop (52) stretched tautly between cooperating driving and return pulleys (40, 50) and having means (74) for removably coupling respective positions on that loop (52) with respective edge portions of the respective curtains (14, 16). The loop (52) is drivable to and fro, whereby to open and close the curtains (14, 16), by rotation of said driving pulley (40). The two pulleys (40, 50) are carried on respective supports (30, 42) adjacent the window opening (10), for rotation about vertical, parallel axes. The driving loop (52) comprises a broad, thin-strip, belt material which has one of its two broad surfaces in contact with the pulleys (40, 50), so that the belt material is suspended and driven between said pulleys (40, 50) with its broad surfaces vertical. The driving pulley (40) and the belt material (52) preferably have inter-engaging teeth (62) for positively driving the curtain driving loop (52). The driving pulley (40) is coupled through a dependent, elongate shaft (36) and a speed-reduction gear unit (32) with a reversible, high-speed, low-voltage motor (34). |
