| 摘要 |
A pull carrier for vertically louvered venetian blinds is disclosed, preferably for use in such blinds having a single drive shaft for transporting the louver carriers along the shaft and also for rotating the louvers about their vertical axes. During rotation of the louvers about their vertical axes by the drive shaft, the pull carrier which effects transport of the louver carriers does not move along the headrail due to a free wheel mechanism comprising a worm and a gear wheel engaged with the worm. The gear ratio of the worm and gear is so selected as to insure that rotation of the louvers about their vertical axes is completed in either of the two opposite directions of rotation before transport of the pull carrier, and subsequently of the louver carriers, can be effected by the drive shaft. Conversely, rotation of the louvers about their vertical axes is avoided during transport of the pull carrier and louver carriers. An overload clutch is provided to protect the blind mechanism when the pull carrier has reached its limit of movement along the headrail in either direction. |
