| 摘要 |
A head rail (2) for a vertical blind, the head rail (2) being elongate and having a drive mechanism at one end for selectively tilting and retracting slats of the vertical blind along the length of the head rail, the drive mechanism including a rotatable tilt drive (6) for tilting slats, a rotatable retract drive (8) for retracting and deploying slats, and a transmission for rotating the tilt drive and the retract drive by means of a single rotatable source, wherein the transmission includes a clutch for rotating the tilt drive (6), the clutch incorporating a lost motion mechanism whereby, after a predetermined number of rotations in the same direction, transmission by the clutch to the tilt drive (6) is disengaged and wherein the transmission includes a control gear which is located at a position along the length of the head rail (2) so that it can be meshed with teeth of an external drive source (4).
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