US Patent 7575036 Pulling cord winder for venetian blind

A pulling cord winder for a Venetian blind is installed at the bottom of a lower rail of the Venetian blind, and the pulling cord winder that winds or retrieves each pulling cord disposed separately on both sides of the Venetian blind has two corresponding engaged upper and lower bases, two spring coil wheels, a spring, a brake member, and a push rod, such that when the push rod retreats and presses the brake member, a resilience of a drawspring pushes the rough surfaces of an arc-shaped pressing board on both sides of the brake member and the two spring coil wheels into a compressed form or an open form as to brake and rotate the two spring coil wheels and control the two springs to lift or lower the Venetian blind to a fixed position.