ALEXANDRIA, Va., Nov. 11 -- United States Patent no. 12,467,534, issued on Nov. 11.
"Gearbox" was invented by Huixing Zhao (Chongqing, China), Yang Tan (Chongqing, China) and Lijiang Chen (Chongqing, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A box-type speed change device includes a box body, a main shaft, a countershaft, a main shaft gears, a countershaft gear and a ratchet. The main shaft and the countershaft are provided in the box body in parallel, the main shaft gear is provided on the main shaft, the countershaft gear meshing with the main shaft gear is provided on the countershaft, and the ratchet meshing with the main shaft gear or/and the countershaft gear is slidably provided on the main...