| 摘要 |
A roller for a roller blind in the shape of a tube (T) comprising a mechanism known per se is braked by means of friction, in that a compression spring (7) is compressed when the blind is pulled down and establishes a force between a collar (6) on the non-rotating rod (2) of the roller blind, and a nut (8) which is rotated by the tube. The nut has a shoulder (8a) which cooperates with a corresponding shoulder (14) at the end of the non-rotating rod. An alternative spring force is obtained by means of a piston in an air cylinder in which a calibrated exhaust opening for the air reduces the braking action when rotation is slow.
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