Operation group for automatically winding up curtains

Abstract

An operation group for curtains with winding roll, including a mechanism ( 1 ), a stop device ( 90 ) and a hub ( 9 ), with the mechanism ( 1 ) aimed at imposing and stabilizing a pre-established pre-loading value for first elastic means ( 2 ), present in the winding roll ( 3 ), with the stop device ( 90 ) being aimed at locking the winding roll ( 3 ) to stabilize the curtain in any unwound position and with the hub ( 9 ) aimed at supporting the roll ( 3 ) at one of its ends. The above operation group (G) includes the mechanism ( 1 ) connected to one end ( 3 a ) of the roll ( 3 ) and the stop device ( 90 ), which is connected to the other end of the roll ( 3 ), so as to define the hub ( 9 ).

1 . An operation group for wind up curtains unwinding from and winding on a winding roll, the operation group including: 
 a mechanism ( 1 ) for imposing and stabilizing a pre-established pre-loading value for first elastic means ( 2 ), present in said winding roll ( 3 );    a stop device ( 90 ) for locking said winding roll ( 3 ) and stabilizing said curtain in any unwound position; and    a hub ( 9 ) for supporting the roll ( 3 ) at least at one of its ends;    said operation group (G) being characterized in that the mechanism ( 1 ) is connected to a first end ( 3   a ) of said roll ( 3 ) and said stop device ( 90 ) is connected to a second end of the roll ( 3 ) and forms the hub ( 9 ).    
   
   
       2 . Operation group, according to  claim 1 , characterized in that: 
 said mechanism ( 1 ) includes a sleeve ( 4 ) and a barrel ( 5 ), the barrel being introduced into the sleeve with possibility to move axially, against the action of associated elastic means ( 6 ), between a first and a second positions (P 1 ,P 2 );    clutch means ( 7 ) are situated between the sleeve ( 4 ) and the barrel ( 5 ) and are mutually engaged when said barrel ( 5 ) is in the first position (P 1 ), to link the sleeve ( 4 ) to the barrel ( 5 ) with respect to rotation, and are disengaged from each other, when said barrel ( 5 ) is in the second position (P 2 ) to allow the sleeve and barrel a relative free rotation;    said mechanism ( 1 ) is associated to said first end ( 3   a ) of the winding roll ( 3 ), in such a way that: said sleeve ( 4 ) is coaxially fixed to the first end ( 3   a );    said barrel (S) has an axial hole and is slidingly keyed onto a shaft ( 8 ) situated inside said winding roll ( 3 ) and motionless with respect thereto;    a proximal end ( 2   a ) of said first elastic means ( 2 ) of the winding roll ( 3 ) is linked to said barrel ( 5 ) and shaft ( 8 ), with respect to rotation;    said barrel ( 5 ) has, at its outer end, a prismatic shank ( 50 ), which is operated to make said barrel ( 5 ) slide axially, with consequent disengagement of said clutch means ( 7 ) and then, to make said barrel ( 5 ) rotate in either one or another direction with respect to said sleeve ( 4 ), to increase or decrease the pre-loading of said first elastic means ( 2 );    the winding roll—mechanism assembly can be mounted on support means ( 1 ), so that said shank ( 50 ) is coupled with a complementary seat (boa), made in the support means ( 10 ), and the clutch means ( 7 ) are disengaged.    
   
   
       3 . Operation group, according to  claim 2 , characterized in that said clutch means ( 7 ) include a plurality of spaces ( 70 ), regularly spaced apart and made in a front facing of said sleeve ( 4 ), and by complementary claws ( 71 ) made in a disc ( 51 ) formed by said barrel ( 5 ).  
   
   
       4 . Operation group, according to  claim 2 , characterized in that said elastic means ( 6 ) are situated inside said sleeve ( 4 ) and are aimed at acting, axially, on a cup ( 52 ), formed by said barrel ( 5 ).  
   
   
       5 . Operation group, according to  claim 3 , characterized in that said barrel ( 5 ) is formed by two pieces ( 5   a , 5   b ), locked to each other when the barrel ( 5 ) is mounted in said sleeve ( 4 ).  
   
   
       6 . Operation group, according to  claim 2 , characterized in that said elastic means ( 6 ) are situated inside said sleeve ( 4 ) and are aimed at acting, axially, on a cup ( 52 ), formed by said barrel ( 5 ), and in that said barrel ( 5 ) is formed by two pieces ( 5   a , 5   b ), locked to each other when the barrel ( 5 ) is mounted in said sleeve ( 4 ).  
   
   
       7 . Operation group, according to  claim 1 , characterized in that: 
 said stop device ( 90 ) is formed by a first cylindrical element ( 90   a ) and a second cylindrical element ( 90   b );    said first cylindrical element is fastened to a corresponding end of said roll ( 3 ), while the second cylindrical element is introduced into said first cylindrical element and is connected to outer means, for making it motionless;    said cylindrical elements first and second ( 90   a , 90   b ) feature first radial seats ( 190   a ) and second radial seats ( 190   b );    relative balls ( 93 ) are provided, which remain housed in said first radial seats, during curtain unwinding and winding up, to determine an unlocked condition for the stop device ( 90 ), said balls ( 93 ) being aimed at engaging with said second radial seats ( 190   b ), when rotation is stopped and a short backward rotation is allowed, to determine a locked condition for the stop device ( 90 ), in which the curtain is stabilized in a pre-established position.    
   
   
       8 . Operation group, according to  claim 1 , characterized in that it includes adaptor rings (30,300), first and second respectively, aimed at allowing the group to be mounted on winding rolls ( 3 ) of bigger dimensions.  
   
   
       9 . Operation group, according to  claim 8 , characterized in that said first adaptor ring ( 30 ) is aimed at being keyed onto said sleeve ( 4 ) and on said first cylindrical element ( 90   a ), and in that said first adaptor ring ( 30 ) is shaped in such a way that all the pre-existing constraints to the rotation between said roll ( 3 ) and said sleeve ( 4 ) and first cylindrical element ( 90   a ) are maintained.  
   
   
       10 . Operation group, according to  claim 8 , characterized in that said second adaptor ring ( 300 ) is formed by two half-rings ( 300   a ) and is aimed at being mounted in a section ( 13   a ) of a connecting pin ( 13 ), in which the latter is to be fixed with respect to said roll ( 3 ), and in that said second adaptor ring ( 300 ) is shaped in such a way as to maintain said rotation constraint.  
   
   
       11 . Operation group, according to  claim 2 , characterized in that said proximal end ( 2   a ) of said first elastic means ( 2 ) is fastened to a bushing ( 2   b ) in turn slidingly coupled with the shaft ( 8 ).