Patent ID: 8510912

Claim:
A self-closing device for sliding doors, said doors having at least one sliding leaf which is hung from an upper profile and configured to be displaced in a direction thereof, said device comprising: a drive belt configured to be arranged along the upper profile and configured to be joined to the sliding leaf; a closing pulley, provided with pre-loaded biasing means for imparting a rotational force on the closing pulley, the closing pulley rotating on a first rotation axis configured to be integral to the upper profile and driven by a first end of the drive belt, wherein said pulley loads the biasing means during opening of the sliding leaf through rotation movement transmitted by the drive belt; and wherein said closing pulley pushes the sliding leaf during closing of the sliding door through opposite rotation movement that transmits unloading of the biasing means; and; a brake pulley, provided with stopping means, which is arranged on a second rotation axis configured to be integral to the upper profile and which engages a second end of the drive belt opposite to the first end, the rotation movement of the closing pulley and the brake pulley being connected by the drive belt, wherein said brake pulley disengages the stopping means during the opening of the sliding leaf; and stops the sliding leaf during the closing of the sliding door by a clutch of the stopping means; a friction brake drum joined to a stop body by first fastening means; and a brake shaft joined to the second rotation axis and producing friction against the brake drum during the closing of the sliding door.