Patent ID: 7681618

Claim:
A system for operating a blind ( 112 ) inside a chamber ( 5 , 150 ) enclosed by panes ( 6 , 7 ) surrounded by a frame ( 15 ), the frame comprising side hollow bars ( 20 , 30 , 35 ) connected by corner pieces ( 40 , 50 , 60 ), the system comprising: a blind-roller ( 113 ) supported inside said chamber ( 5 , 150 ), wherein a first end of the blind ( 112 ) is fixedly connected to the blind roller ( 113 ); a kinematic mechanism placed inside an oblong body ( 65 ) fixed to a corner piece ( 60 ), wherein said mechanism includes three mutually engaged pinions ( 78 , 79 , 80 ), a first pinion ( 80 ) of which axially connected to the blind roller ( 113 ); and a first box ( 136 ) supported inside said chamber ( 5 , 150 ) fixedly to a first end of the frame ( 15 ); wherein said blind ( 112 ) comprises: first pulling means ( 153 ) supported inside said first box ( 136 ), the first pulling means including a helical spring ( 154 ) wound around a spring-roller ( 157 ) axially connected to a second pinion ( 78 ) of the kinematic mechanism by the interposition of an intermediate idle third pinion ( 79 ); second pulling means ( 173 ), comprising: a mobile bar ( 120 ) fixedly connected to a second end ( 111 ) of the blind ( 112 ); a second box ( 184 ) supported inside said chamber ( 5 , 150 ) fixedly to a second end of the frame ( 15 ) opposite to a first end of the frame; a cord ( 180 ) having one end fixed to a center of the mobile bar ( 120 ) and a second end fixed to a cord-roller ( 198 ) supported inside the second box ( 184 ); a first pin ( 217 ) axially engaged with a first end of the cord-roller ( 198 ) and orthogonally engaged by a fourth pinion ( 103 ) and worm screw ( 100 ) with a shaft ( 104 ) of a first magnetic disk ( 98 ) disposed within the second box ( 184 ) and matching with an internal surface of the pane ( 6 ) of enclosed chamber ( 5 , 150 ); and a threaded bushing ( 225 ) fixed to a second end of said cord roller ( 198 ) that screws into a threaded bar ( 224 ) fixed to the frame ( 15 ) for translating the said cord roller ( 198 ) axially to accommodate turns ( 202 ) made by said cord ( 180 ); and a second magnetic disk ( 12 ) rotated by external operating means and matching, at the position of the first magnetic disk ( 98 ), with the external surface of the pane ( 6 ) of the enclosed chamber ( 5 , 150 ).