ALEXANDRIA, Va., April 21 -- United States Patent no. 12,605,975, issued on April 21, was assigned to Foshan Robin Hood Metal Products Co. Ltd. (Foshan City, China).
"Trailer assembly" was invented by Yuping Lv (Daye City, China) and Jianwen Lv (Foshan City, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a trailer assembly, which includes a traction ball head assembly, wherein the traction ball head assembly includes a traction ball seat and a traction ball connection assembly, the traction ball seat is provided with a connection through-hole for the traction ball connection assembly to pass through, a first keyway is formed on a hole wall of the connection through-hole...