Mechanism for operating venetian blinds - incorporates line running around pulley on shaft also supporting second pulley on and off which strap is wound

摘要

A line (11) is laid around a pulley (9) on a shaft on which is supported a second pulley (2). A strap (3) is wound on and off this second pulley and raises and lowers the blind. A brake component (12) retains the first pulley (9) when the blind is in the required position.