Patent ID: 7581578
Filing Date: 2009-09-01
Classification: E04F,E06B,F25D

Abstract:
1. A curtain device mounted on a shaft ( 2 ) around which the curtain ( 1 ) may be wound toward an open position and from which it can be unwound toward a closed position, a drive wheel ( 7 ) secured coaxially on the shaft ( 2 ) and cooperating with the curtain ( 1 ) in such a manner so as to move the latter between these two positions, wherein the device comprises a flexible oblong control element ( 11 ) that cooperates with the drive wheel ( 7 ), said control element ( 11 ) being mounted freely in relation to the curtain in such a manner to allow the curtain ( 1 ) to be moved between an open position and a closed position independently of slack which may form in the curtain ( 1 ), on the one hand, and to be able to move along at least one of the side edges ( 4 ) of the curtain ( 1 ) and act on the zone ( 8 ) of the latter opposite that mounted on the shaft ( 2 ), on the other hand, wherein the pitch diameter of the drive wheel ( 7 ) is less than the diameter of the wound portion of the curtain ( 1 ) in its open position, and is greater than the diameter of the aforementioned shaft ( 2 ) or the wound portion of the curtain ( 1 ) in its closed position.