Patent ID: 7520310

Claim:
A Venetian type blind, comprising a plurality of slats, means for packing and extending the slats, means for adjusting the angular position of the slats and lost-motion means interposed functionally between said packing and extending means and said adjustment means in such a way as to lock the said Venetian blind adjustment means after a predetermined number of rotations of an actuating shaft, wherein said lost-motion means comprise at least two toothed elements, one of which is capable of moving a slider to cause it to interact selectively with a stop element of said adjustments means, and wherein said means for adjusting the angular position of the slats comprise an annular line holder and a cam element of essentially annular shape, mounted coaxially on the actuating shaft, said annular line holder comprising means for gripping a line which controls the angular position of the slats, wherein an additional cam element is mounted idle coaxially on the actuating shaft and defines end stops for the cam element, said additional cam element comprising a tooth with a sprint-release action which will fit into a depression present on a base.