ALEXANDRIA, Va., Nov. 3 -- United States Patent no. 12,780,599, issued on Nov. 3.
"Rope winding and unwinding device with dual-locking function" was invented by Zhenfeng Xu (Yangjiang City, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present application discloses a rope winding and unwinding device with a dual-locking function and relates to the technical field of rope unwinding devices. This device includes a connecting mechanism, a locking mechanism is provided at one side of the connecting mechanism and includes a shell, at least three connecting blocks are provided on an inner wall of one side of the shell, a rotating shaft is fixedly connected to one side of the shell, a rope spool is rotat...