ALEXANDRIA, Va., June 4 -- United States Patent no. 12,320,196, issued on June 3.
"Roll-up control device for roller shade" was invented by Chih-Yung Wang (Taipei, Taiwan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A roll-up control device for a roller shade, comprising a turntable assembly comprising a turntable, a pull spring, an outer turntable, a shaft and a clutch; and a brake assembly comprising a brake shaft cover fastening the shaft rod, a brake spring sleeved on a side of the brake shaft cover, a compression spring expanded and compressed inside the brake shaft cover, a brake sleeve sleeved the side of the brake shaft cover and a shaft housing accommodating a damping ring and clamping the brake s...