Motor-driven shutter or sun-shading device

Abstract

The motorized shutter, blind or sun-protection device comprises at least one roll-up element ( 2; 20 ), one end of which is kinematically linked to a roll-up element drive roller ( 1 ) and the other end of which is attached to pulling strands ( 3, 4; 15, 16; 22, 23 ) kinematically linked to a strand drive roller ( 1; 17, 18; 24, 25 ), at least one strand return roller ( 6; 19 ), and an elastic means ( 7; 29 ) keeping the roll-up element and the strands tensioned. It constitutes a balanced system.

1 . A motorized shutter, blind or sun-protection device comprising at least one roll-up element ( 2 ;  20 ), one end of which is kinematically linked to a roll-up element drive roller ( 1 ) and the other end of which is attached to pulling strands ( 3 ,  4 ;  15 ,  16 ;  22 ,  23 ) kinematically linked to a strand drive roller ( 1 ;  17 ,  18 ;  24 ,  25 ), at least one strand return roller ( 6 ;  19 ), and an elastic means ( 7 ;  29 ) keeping the roll-up element and the strands tensioned, which device constitutes a balanced system.  
     
     
         2 . The device as claimed in  claim 1 , wherein the roll-up element drive roller and the strand drive roller are coaxial and rotate as one.  
     
     
         3 . The device as claimed in  claim 1 , which device comprises two roll-up elements ( 2 ,  2 ′;  20 ,  20 ′) and two roll-up element drive rollers ( 1 ,  1 ′) each associated with a pulling strand drive roller ( 1 ,  1 ′,  17 ,  18 ,  17 ′,  18 ′;  24 ,  25 ,  24 ′,  25 ′) and constituting two pairs of rollers, each of these pairs of rollers serving as return rollers for the rollers of the other pair.  
     
     
         4 . The device as claimed in  claim 1 , wherein the linear weight of the roll-up element ( 2 ;  20 ) and the linear weight of the pulling strands ( 3 ,  4 ;  15 ,  16 ), taken together, are equal.  
     
     
         5 . The device as claimed in  claim 2 , wherein the roll-up element has an end bar ( 5 ), and wherein the pulling strands have at least one counterweight ( 31 ,  32 ) compensating for the weight of the bar.  
     
     
         6 . The device as claimed in  claim 2 , wherein the linear weight of the roll-up element ( 2 ;  20 ) and the linear weight of the pulling strands ( 3 ,  4 ;  15 ,  16 ), taken together, are equal, wherein the roll-up element has an end bar ( 5 ), wherein the pulling strands have at least one counterweight ( 31 ,  32 ) compensating for the weight of the bar, wherein the roll-up element drive rollers ( 1 ) and strand drive rollers ( 1 ) have the same diameter, wherein one of the ends of the roll-up element and of the strands is free, wherein the device comprises a press roller ( 8 ) bearing against the drive rollers and wherein the roll-up element ( 2 ) and the strands ( 3 ,  4 ) pass in opposite directions between the drive rollers ( 1 ) and the press roller ( 8 ) so that they are driven in opposite directions.  
     
     
         7 . The device as claimed in  claim 3 , wherein the linear weight of the roll-up element ( 2 ;  20 ) and the linear weight of the pulling strands ( 3 ,  4 ;  15 ,  16 ), taken together, are equal, wherein the roll-up element drive rollers ( 1 ) and strand drive rollers ( 1 ) have the same diameter, wherein one of the ends of the roll-up element and of the strands is free, wherein the device comprises a press roller ( 8 ) bearing against the drive rollers and wherein the roll-up element ( 2 ) and the strands ( 3 ,  4 ) pass in opposite directions between the drive rollers ( 1 ) and the press roller ( 8 ) so that they are driven in opposite directions.  
     
     
         8 . The device as claimed in  claim 6 , wherein the device comprises at least one store in which the roll-up element accumulates when the device is opened and the strands accumulate when the device is closed.  
     
     
         9 . The device as claimed in  claim 7 , wherein the device comprises at least one store in which the roll-up element accumulates when the device is opened and the strands accumulate when the device is closed.  
     
     
         10 . The device as claimed in claims  2 , wherein the linear weight of the roll-up element ( 2 ;  20 ) and the linear weight of the pulling strands ( 3 ,  4 ;  15 ,  16 ), taken together, are equal, wherein the roll-up element has an end bar ( 5 ), wherein the pulling strands have at least one counterweight ( 31 ,  32 ) compensating for the weight of the bar, wherein one of the ends of the roll-up element ( 20 ) and of the strands ( 15 ,  16 ) is attached to the drive rollers so that the pulling strands, consisting of tapes, roll up in a spiral when the roll-up element unrolls, which device comprises conical pulleys ( 14 ,  14 ′) with a helical groove that rotate as one with the roll-up element drive roller ( 1 ), on which pulleys cords with counterweights ( 10 ,  11 ) are rolled up and unroll, in opposite directions, the torques generated by these counterweights compensating for the variation in torque generated by the variations in the roll-up diameters of the roll-up element and of the pulling strands.  
     
     
         11 . The device as claimed in  claim 3 , wherein one of the ends of the roll-up element ( 20 ) and of the strands ( 15 ,  16 ) is attached to the drive rollers so that the pulling strands, consisting of tapes, roll up in spiral when the roll-up element unrolls, which device comprises conical pulleys ( 14 ,  14 ′) with a helical groove that rotates as one with the roll-up element drive roller ( 1 ), on which pulleys cords with counterweights ( 10 ,  11 ) are rolled up and unroll, in opposite directions, the torques generated by these counterweights compensating for the variation in torque generated by the variations in the roll-up diameters of the roll-up element and of the pulling strands.  
     
     
         12 . The device as claimed in claims  2 , wherein the linear weight of the roll-up element ( 2 ;  20 ) and the linear weight of the pulling strands ( 3 ,  4 ;  15 ,  16 ), taken together, are equal, wherein the roll-up element has an end bar ( 5 ), wherein the pulling strands have at least one counterweight ( 31 ,  32 ) compensating for the weight of the bar, wherein the end of the roll-up element ( 20 ) linked kinematically to the drive roller ( 1 ) is attached to the drive roller ( 1 ) such that the roll-up element rolls up around the roller and wherein the pulling strand drive roller has two frustoconical parts ( 24 ,  25 ) with helical grooves in which the pulling strands ( 22 ,  23 ) roll up.  
     
     
         13 . The device as claimed in  claim 3 , wherein the linear weight of the roll-up element ( 2 ;  20 ) and the linear weight of the pulling strands ( 3 ,  4 ;  15 ,  16 ), taken together, are equal, wherein the end of the roll-up element ( 20 ) linked kinematically to the drive roller ( 1 ) is attached to the drive roller ( 1 ) such that the roll-up element rolls up around the roller and wherein the pulling strand drive roller has two frustoconical parts ( 24 , 25 ) with helical grooves in which the pulling strands ( 22 ,  23 ) roll up.  
     
     
         14 . The device as claimed in  claim 12 , wherein the end of the roll-up element to which the pulling strands are linked has a hollow bar ( 26 ) housing a traction-operated spring ( 29 ) to whose ends the pulling strands ( 22 ,  23 ) are attached.  
     
     
         15 . The device as claimed in  claim 13 , wherein the end of the roll-up element to which the pulling strands are linked has a hollow bar ( 26 ) housing a traction-operated spring ( 29 ) to whose ends the pulling strands ( 22 ,  23 ) are attached.  
     
     
         16 . The device as claimed in  claim 2 , wherein the coaxial roll-up element and strand drive rollers form a single roller ( 1 ).  
     
     
         17 . The device as claimed in  claim 3 , wherein the ends of the two roll-up elements ( 20 ,  20 ′) have hollow bars ( 26 ,  26 ′) at whose ends are provided or formed returns ( 27 ,  28 ,  27 ′,  28 ′) for the pulling strands ( 22 ,  23 ,  22 ′,  23 ′) linked together in the bars, the pulling strands ( 22 ,  23 ) of at least one of the pairs of strands being linked by a spring ( 29 ) inside the hollow bar ( 26 ).