1922 sports cars on the track began to use seat belts, 1955 Ford cars in the United States began to use seat belts. Generally speaking, the seat belts in this period are mainly two-point seat belts. 1955 aircraft designer Niels invented the three-point seat belt after working in Volvo Car Company.
1963, Volvo Car Company began to register Niels' three-point car seat belts and assembled them on its own cars. 1968, the United States stipulated that seat belts must be installed in front seats of automobiles, and developed countries such as Europe and Japan have also formulated the regulations that car occupants must wear seat belts.
The Ministry of Public Security of China issued a notice on10.5, stipulating that from10.5, drivers and front passengers of all buses (including cars, jeeps, vans and mini-cars) must use seat belts.
Structure of seat belt:
The seat belts used in modern cars are generally three-point seat belts, including seat belt webbing, retractor, locking device, buckle and lock tongue.
Seat belt webbing is a part of the braided belt used to fix the body, which is mainly composed of polyester, polypropylene and nylon. The seat belt webbing blended by these three materials can not only ensure the strength, but also have a good performance in durability.
The reel in the retractor is connected to one end of the seat belt, and the spring in the retractor provides torque for the reel to rotate autonomously. At this time, the coil spring will drive the reel to rotate and tighten the slack seat belt.
The working principle of locking device is similar to that of clutch. The pawl is activated by the centrifugal force of the high-speed rotation of the reel, and finally engages with the ratchet wheel of the reel.
Refer to the above? Baidu encyclopedia-car seat belt
Refer to the above? People's network-past lives, who knows seat belts.