Views:3 Author:Site Editor Publish Time: 2021-04-30 Origin:Site
What is the fifth wheel ? Is it the fifth wheel on the car? Later, when I saw the picture, I realized that it turned out to be a tractor saddle.
Some people may ask why the saddle is called the fifth round, which dates back to 1911. According to historical records, an American named Charles Martin invented the fifth round. At that time, all vehicles had only four wheels. Later, it was necessary to connect a carriage and a trailer. Charles Martin put the disc-shaped object on the overall frame of the vehicle for easy rotation, which means that it is the fifth vehicle out of the four wheels. The object that can rotate, hence the name of the fifth round.
In 1936, the U.S. Patent and Trademark Office received an application from a man named Charles E. Bradshaw, who was also the first person to apply for the fifth round as a patent. The patent number was 2053812.
Today, the fifth round has become one of the most important parts in the logistics and transportation industry. Let the trailer slide into the fifth wheel and lock it, and the tractor can safely tow the semi-trailer. It can be seen that this invention has affected the transportation of the world.