Seat belts were born before cars themselves. 1885, in order to prevent passengers from falling off the carriage, seat belts were first applied to the carriage. 1902 In the racing competition held in new york on May 20, 2002, I used several safety belts to tie myself and my partner to their seats in order not to be driven out by the racing car when turning at high speed. It happened that the car they drove accidentally rushed into the audience, causing two deaths, dozens of injuries, and two racing drivers died because of the belt. So these seat belts are also prototypes of seat belts.
I know that seat belts are very important. Do you know who invented it?
Since then, Ford and other automobile manufacturers have also begun to use two-point and Y-shaped safety belts to protect the safety of drivers and passengers. However, due to its unscientific structure, these seat belts can't fix the user perfectly on the seat.
Until 1958, Niels Bolin, an engineer of Volvo, invented a three-point safety belt that can span the lower abdomen and shoulders to measure the physiological ideal position. Since then, the shape of the seat belt has been fixed at three o'clock and has continued until now.
Volvo, as the inventor of seat belts, has a patent, but it does not use this technology related to human safety for profit, but it is open for free, calling on all car manufacturers to use it for free. Therefore, since 1968, the United States has stipulated that car front seats must be equipped with seat belts.
More than 40 years after the invention of three-point seat belts, the statistics of Volvo Traffic Accident Research Group show that more than 654.38 billion cars around the world are equipped with three-point seat belts, which reduces the number of casualties in automobile collision accidents by 75%. It is estimated that since the application of three-point seat belts, * * instruments have saved 6,543,800 lives. This data shows that the three-point seat belt is a very effective automobile safety equipment.
Nowadays, in people's daily life, three-point seat belts are widely used in cars. In addition, with the popularity of family cars, the proportion of children's seats is increasing, and some countries have written the use of children's seats into laws. Children's seats use 5-point seat belts. Compared with the 3-point seat belt, the 5-point seat belt is designed with protective stress points on the shoulders and thighs of the human body, which can better maintain the balance between stress and protection. Five-point seat belts are also used in racing cars. In addition, there are special-purpose multi-point seat belts, but they are not divorced from the most basic functions of three-point seat belts. I know that seat belts are very important. Do you know who invented it?
Next time, someone will pay attention to fasten the seat belt, but it doesn't matter. Or I'll throw you out as soon as something happens.