Patent ID: 7082983

Claim:
A window shade component group ( 1 ) comprising a windup shaft ( 4 ) with two ends, a window shade web ( 2 ) having one edge fastened to said windup shaft ( 4 ), a spring drive ( 12 ) for pre-tensioning the windup shaft ( 4 ) in a windup direction which winds the web onto the windup shaft, said spring drive ( 2 ) having two actuating ends ( 14 ) one of which is secured to the windup shaft ( 4 ), a bearing device ( 6 , 24 ) disposed at one end of the windup shalt ( 4 ) and having a connecting end ( 8 ) for attachment to a vehicle, said spring drive having its other actuating end ( 14 ) fixed to said bearing device ( 6 , 24 ), a releasable blocking device ( 17 , 18 , 29 , 36 , 38 , 39 , 43 ) having a blocking member set in an initial blocking condition for blocking the spring drive ( 12 ) from acting between the windup shaft ( 14 ) and the bearing device ( 6 , 24 ) when the windup shaft is in a pre-tensioned condition corresponding to the window shade web ( 12 ) being wound up on the windup shaft, and said blocking member being releasable from said blocking condition without the need for tools to an unblocking condition solely in response to a first rotational movement of the windup shaft ( 4 ) in an unwinding direction of the window shade web ( 2 ) from the windup shaft for disabling the blocking device and enabling the spring drive ( 12 ) to act between said bearing device and windup shaft.