Disadvantages of automatic coupler

Due to the poor buffering performance of screw coupler, less bucket formation, slow operation speed and complicated bucket suspension program, we have to find a further solution. 1868, the automatic hook was invented by American technical engineer "Janney" and named "JanneyCoupler" after him. Inspired by the handshake, he took it as a foothold to design the scheme, which was further improved in 1973 and applied for a patent. The performance of Jenny coupler far exceeds that of spiral coupler. 1887, the coupler was fully supported by the American government agency Railway Vehicle Technician Association, and 1893 was applied by the American Congress, which promoted the rapid marketing and popularization of JanneyCoupler, and more and more railway vehicle manufacturers applied the coupler. In addition, China introduced JanneyCoupler at the initiative of Zhan Tianyou to replace the traditional spiral coupler.