ALEXANDRIA, Va., June 4 -- United States Patent no. 12,320,401, issued on June 3, was assigned to YONGKANG HAILI INDUSTRIAL Co. LTD. (Yongkang, China).
"Reinforced coil spring of a hose reel" was invented by Yujun Shao (Zhejiang, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The reinforced coil spring of a hose reel includes a steel leaf spring being arranged on an inside surface of the outermost spring-coil. An outer end tip of the steel leaf spring and the outermost spring-coil are fixedly connected, and an inner end tip of the steel leaf spring is located between the outermost spring-coil and a second-outer spring-coil. The steel leaf spring added in the reinforced coil spring of a hose reel can no...