Cycling photography

Li Zhiheng, a boy of 19 years old, rode all the way from his hometown of Shifang, Sichuan for 24 days, with a journey of 2,300 kilometers, and finally arrived at Jiashan Campus in Shanghai, Zhejiang Province, and completed his dream of going to school by bike. Moved by the spirit and perseverance of this teenager. So do the friends know the history of this juvenile bicycle?

Bicycles were born in18th century, but the first truly practical bicycles appeared in19th century. 18 17, German delaisse invented a wooden two-wheeled bicycle with handlebars in Paris. In the early days of the invention of bicycles, people thought that the bigger the wheels, the faster the speed. At that time, the wheel was almost the height of a person.

First of all, the first invention of the bicycle

1790 France Sifrak invented the most primitive bicycle. It has only two wheels and no transmission. When people ride on it, they need to use two pedals to drive forward.

180 1 year, Russian Artamaa Novo designed the world's first pedal bicycle. 18 17 Dresden, a German, installed a rudder on his bicycle so that the bicycle could change direction.

In 18 17, delaisse, a German, added a handlebar to the front wheel to change the forward direction. However, riding a bicycle still needs two feet to step on the ground at a time to push the car forward. Delaisse became a recognized bicycle inventor!

Second, the technological maturity process of bicycles

The English blacksmith Macmillan invented it in delaisse in 1840? Pony? On this basis, the improvement was made. He installed a crank on the axle of the front wheel, and then connected the crank with the front pedal with a connecting rod. The front and rear wheels were made of iron. In this way, people's feet really leave the ground, from the alternate trampling of feet to the rolling of wheels.

186 1 year, Michaux and his son were in France. A rotatable pedal is installed on the front wheel, and the saddle of the car is installed on the front wheel. They crowned the car? Bicycle? 1867 was exhibited at the Paris World Expo, which opened the eyes of the audience and once set off a bicycle craze. However, because of the height, getting on and off downhill is very dangerous, and it is easy to fall down, so the saddle is fixed on the frame instead.

1867, Madison, an Englishman, designed the first steel spoke bicycle.

1869, British Renault used spokes to tighten the rim for the first time, made the frame with steel pipes, and installed solid rubber belts on the rim for the first time, greatly reducing the weight of bicycles. Bicycles with rear wheel guidance and drive appeared in Stuttgart, Germany. At the same time, rolling bearings, flywheels, foot brakes, springs and other components are used on bicycles.

1874, an Englishman Lawson ingeniously fitted his bicycle with chains and sprockets, and used the rotation of the rear wheel to push the car forward. But it is still not coordinated and stable enough.

1886, British mechanical engineer stahly fitted a front fork and a brake on a bicycle, using roller bearings, and the front and rear wheels were the same size to keep balance. He made a diamond-shaped frame out of steel pipes and used rubber wheels for the first time. The riding performance of bicycles is significantly improved. Stahly not only improved the structure of bicycles, but also transformed many machine tools for producing bicycle parts.

1888, Irish veterinarian Dunlop was inspired by the treatment of cattle flatulence. He glued the rubber hose for watering his garden into a circle and put it on his bicycle, which was the beginning of pneumatic tires. It has solved the most uncomfortable vibration problem of bicycles for many years and improved the speed of bicycles a lot. But also improves the use function of the bicycle.

Summary:

From 179 1 to 1888, the invention and improvement of bicycles have experienced the unremitting struggle of these inventors for nearly 100 years. Since then, the prototype of modern bicycles has basically been laid. Today, bicycles have become the most used, simplest and most practical means of transportation in the world. Especially now, advocating green travel and cycling is undoubtedly a healthy and environmentally friendly means of transportation, and cycling has become the first choice for more and more athletes.