Importance

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Abstract

For a roller blind, particularly for use as a blackout shade, and with a spring-biased roller bar and a blind rolled on the roller bar and having along its lateral edges guide members guided in tracks in guide rails disposed at both sides of the window opening, and a bottom bar, a brake device is provided for retaining the bottom bar in an arbitrary position against the effect of the bias-force by a cord arrangement with a cord which at the bottom of one guide rail is passed through the guide rail, the bottom bar and the other guide rail to a fixture at the top thereof. A friction mechanism acting on the cord two pins is mounted in the bottom bar over which the cord is passed in S-shape. To ensure parallel guidance of the bottom bar in relation to the roller bar the cord arrangement may include two cords mounted in mirror-inversion.

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First Claim