| 摘要 |
<p>A mono operated Venitian blind comprises a driving shaft (5) mounted in a headrail, one or more frictionally driven shutter wheels being mounted on said shaft, said shutter wheels carrying the upper ends of ladder cords for a number of horizontal laths and a bottom rail (4) being liftable up and down by the driving shaft (5). The lowermost ends of the ladder cords are attached to said bottom rail. At the driving shaft (5) a wheel for a ball cord is mounted on the driving shaft (5) at each end of the blind. An endless ball cord (2) is passed around each of said wheels, said endless ball cord being also passed around an idle wheel placed below the bottom rail (4) in its lowermost position. One part of each ball cord (2) is passed through a vertical bore in a bearing part (3), by means of which two bearing parts (3) in each and end of the blind are carrying the bottom rail (4) in such a way, that said bottom rail is tiltable around a longitudinal axis. The vertical bores are of such dimensions, that the ball cord (2), but not the individual balls, can pass through the bore; and a number of balls are left out from that part of the cords (2), which are passed through said bores. Thereby a clearance is obtained enabling the laths to be tilted without lifting up or down the bottom rail.</p> |
