ALEXANDRIA, Va., Sept. 15 -- United States Patent no. 12,735,178, issued on Sept. 15, was assigned to Tibet Chuangbo General Aviation Technology Co. Ltd. (Shannan, Japan).
"Helicopter rotor head structure" was invented by Bo Zhang (Shannan, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A helicopter rotor head structure comprises a hub, a holder, a bearing and a pitch change mechanism. The hub is provided at the top of a main rotor mast. A connecting shaft is provided in the hub. An end of the connecting shaft extends to the outside of the hub and has the bearing sleeved thereon. The end of the holder facing away from a blade is sleeved on the bearing, and is rotationally connected to the connecting sh...