Blind, especially for covering a glass pane of a window

Abstract

A blind for a window has a winding rod and a hanging wound onto the winding rod. Two belts on opposed sides of the hanging are supported on four end rollers arranged in pairs. A drive is connected to a first end roller or to an additional drive roller and drives the belts in a circulating movement. The winding rod rotates synchronously with the circulating belts. A leading end of the hanging is attached laterally to the belts. A device for compensating a reduction of a circumference of the hanging on the winding rod during gradual unwinding from the winding rod is provided. A circumference of the first roller or of the additional drive roller is smaller than a circumference of the hanging when wound completely onto the winding rod and is greater than a circumference of the hanging when completely unwound from the winding rod.

1 . A blind, in particular for covering a glass pane of a window, comprising a hanging ( 5 ) wound onto a winding rod ( 4 ) and configured to be unwound from this winding rod ( 4 ) by a rotational movement, characterized in that 
 two belts ( 2 ) are provided on either side of the hanging ( 5 ), which belts are continuously circulating about two end rollers ( 1 ), wherein one of the four rollers ( 1 ) or an additional drive roller is configured to be driven and causes the belts ( 2 ) to perform a circulating movement,    the winding rod ( 4 ) is configured to rotate synchronously with the circulating movement of the belts ( 2 ) and    the leading end of the hanging ( 5 ) is attached laterally to the two belts ( 2 ), respectively.    
     
     
         2 . A blind according to the preceding claim, characterized in that 
 an electric motor ( 3 ) is provided as a drive.    
     
     
         3 . A blind according to one of the preceding claims, characterized in that 
 the winding rod ( 4 ) has a winding roller ( 6 ) at the ends, respectively, which rollers are driven by the belts ( 2 ).    
     
     
         4 . A blind according to  claim 3 , characterized in that 
 the diameter of the winding rollers ( 6 ) for the winding rod ( 4 ) matches the diameter of the end rollers ( 1 ) for the belts ( 2 ).    
     
     
         5 . A blind according to one of the preceding claims, characterized in that 
 a terminal rod ( 7 ) is provided on the leading end of the hanging ( 5 ).    
     
     
         6 . A blind according to one of the preceding claims, characterized in that 
 a device is provided for compensating the reducing circumference of the windings of the hanging ( 5 ) on the winding rod ( 4 ) during gradual unwinding.    
     
     
         7 . A blind according to  claim 6 , characterized in that 
 the hanging ( 5 ) is a hanging ( 5 ) with transversely extending wave structure and    the circumference of the roller ( 1 ) (or additional drive roller) driving the belts ( 2 ) is smaller than the circumference of the hanging ( 5 ) when wound completely onto the winding rod ( 4 ) and is greater than the circumference of the hanging ( 5 ) completely unwound from the winding rod ( 4 ).    
     
     
         8 . A blind according to  claim 6  or  7 , characterized in that 
 the hanging ( 5 ) is a hanging ( 5 ) with transversely extending wave structure and  
 either the winding rod ( 4 ) or the leading end of the hanging ( 5 ) is movable by a compensation spring element ( 8 ) relative to a longitudinal extension of the belts ( 2 ) during the winding or unwinding process.  
 
     
     
         9 . A blind according to  claim 6 , characterized in that 
 as a hanging ( 5 ) a smooth hanging ( 5 ) is provided and    the circumference of the roller ( 1 ) (or additional drive roller) driving the belts ( 2 ) is smaller than the circumference of the hanging ( 5 ) wound completely onto the winding rod ( 4 ) and is greater than the circumference of the hanging ( 5 ) completely unwound from the winding rod ( 4 ).    
     
     
         10 . A blind according to  claim 6 , characterized in that 
 as a hanging ( 5 ) a smooth hanging ( 5 ) is provided,    the circumference of the roller ( 1 ) (or additional drive roller) driving the belts ( 2 ) is greater, smaller or, in particular, approximately identical to the circumference of the hanging ( 5 ) completely wound onto the winding rod ( 4 ) and    that either the winding rod ( 4 ) or the leading end of the hanging ( 5 ) is movable by a compensation spring element ( 8 ) relative to the longitudinal extension of the belts ( 2 ) during the winding or unwinding process.    
     
     
         11 . A blind according to one of the preceding claims, characterized in that 
 the hanging ( 5 ) is a foil.