Patent ID: 8403020

Claim:
A roller blind device comprising: a) a drive shaft; b) at least one roller blind including a roller blind tube extending along an elongated axis; and c) an end plug including an inner part configured to cooperate with the drive shaft, a surrounding part configured to cooperate with the roller blind tube, an unwrap spring surrounding the inner part with the unwrap spring being configured to be tightened by wrapping the spring with respect to the inner part in order to rotatably couple the roller blind and the drive shaft together, and a rotatable control element configured to engage the unwrap spring to loosen the spring by unwrapping the spring with respect to the inner part in order to rotatably decouple the roller blind from the drive shaft, wherein the drive shaft drives the unwrap spring to rotate, such that the unwrap spring is tightened and engages the surrounding part when driven and rotating in a first direction by the drive shaft and also when driven and rotating in a second direction by the drive shaft.