| 摘要 |
The invention relates to an improved lift mechanism for a Venetian blind comprising a plurality of parallel elongated slats and pairs of Sift cords (19), where the lift mechanisms comprise a spool shaft (3) mounted for rotation with and axial displacement over a drive shaft (1) and guide means (5, 7) for maintaining the lift cords (19) in their proper axial position and for directing the lift cords (19) to the outer circumferential surface of said spool shaft (3), whereby the lift cords (19) upon rotation of said spool shaft (3) will become helically wound on or off the circumferential surface of the spool shaft (3) resulting in said slats being raised or lowered as the spool shaft (3) rotates The invention furthermore relates to systematic cascading of lift mechanisms for obtaining pairs of lift cords according to the number required for the job and for connection of drive motors.
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