Tell you a ghost story: chainsaw invention is to facilitate the seeking pelvic bone to have children

Source: Science Popularization China

Although the history of humans has been using saws has been thousands of years, it has been released for more than 200 years. It is surprising that people initially invented that the chainsaw was not used to log in, but to facilitate maternal children.

Really, the initial chainsaw was only used to cut the maternal pelvis ...

Picture source pexels

Help to have prototypes at the beginning of childbirth

Due to the failure of science and technology, the cases of mothers or babies died abound during childbirth. From the perspective of fertility, childbirth is mainly divided into two types: smooth birth and caesarean section. In ancient China, there were very few cases of cesarean section, and "Historical Records" was called "cesarean section".

The cesarean section used in the West is actually a decline that mothers cannot use the baby when they are painful or exhausted. In April 1610, Jeremias Tromes Tarimas, the University of Vittenburg, in Germany, performed the first modern caesarean section in the history of giving birth.

Since then, many mothers have died of severe bleeding or infection during caesarean section. Doctors in various countries have conducted experiments to improve surgery to increase the survival rate of maternal and babies.

In early 1783, a Scottish doctor covered his face and ran into the office of his colleague John Aite. It turned out that she had just had a cesarean section surgery in her hand, and her mother and child died. While comforting female colleagues, Aite informed James Jeffri, a colleague from another hospital to discuss solutions together.

18th -century cesarean section bronze print

After Jeffrer arrived, let the female doctor report the dean to be the soothing work of the family members, and then discuss with Aite how to improve the cesarean section surgery.

After careful research, they found that there were two fatal disadvantages of the popular caesarean section at that time: First, doctors used a small saw and a small knife to manually cut the pelvis of the mother. It took more than 20-30 minutes to complete it. It is often awakened and even painful; the second is that the maternal bleeding is inevitable during the operation, and finally died due to excessive blood loss.

How to do it? After repeated experiments, they proposed a bold idea, that is, connect the knife and the small saw with a chain, and control the speed of the saw by shaking the crank. After more than a year of continuous improvement, the hand -shaped saw knife device has become exquisite and practical.

During the surgery, in the face of the baby stuck in the birth canal, the doctor's bracelet chain can cut the mother's pubic bone combination for a few minutes (the structure connected by the fibrous cartilage between the pubic noodles on both sides of the pelvis), so that the pubic bone on both sides Separate, so that the baby is more convenient to get from the uterus.

After childbirth, the mother should go through the painful recovery process: they are banned on the suspension -type special bed, and they cannot move before the wound healing, and it is more than ten days before and after.

Because Aite has a sawtooth chain invented, later generations call it a bracelet saw. After the gasoline engine is the power, people call it a oil saw. The oil saw is the prototype of modern chainsaw.

The earliest bracelet saw simulation diagram (picture source: public domain)

In 1785, Aite and Jefferi jointly published the book "Principles of Making Real Estate and Postpartum Medicine". The book not only introduces the pelvic cutting of the bracelet saw as the main tool in detail (that is, the pubic bone combined), but also the principle and schematic diagram of the bracelet saw. The bracelet saw they developed in European countries was promoted.

Market inspection update replacement

History has entered the middle of the 19th century. With the development of industries, the demand for wood is getting greater, and the development of logging tools has become the target of the scientific community. When California engineer Muir saw the doctor's bracelet saw for childbirth surgery, the clever machine moved, and it was developed into a huge logging chain sawing machine according to the gourd painting scoop.

The working principle of this machine is to cut the horizontal movement of the L -shaped blade interlaced on the sawchain. It weighs more than 100 kg and must be hung up with a heavy machine to work. At that time, there were many innovation and inventions in the West, and there were very few in the market test.

与缪尔发明的新型链锯机一样，英国人汉密尔顿1880年研制而成的纺车式锯子、美国人本斯1905年发明的最早的链条循环链锯等，都因太过笨重、成本太高或The efficiency is too low and is eliminated by the market one by one.

In 1926, when an engineer, a German businessman Andre Steel, founded a boiler production plant in his hometown of Stuttgart. He needed a large amount of wood as raw materials to develop the most affordable logging tools. After carefully studying the chain saws invented by Aite, Muir, Benz, etc., he finally designed the world's first special logging chain saw by electric power.

This chain saw with electricity is about 50 kg, and the work is 3 kilowatts. It can see a tree with a diameter of about 1 meter. Two people can easily operate. He called this kind of electric chain saw as a chainsaw and a power saw.

Andre Steel and his improved chainsaw (source: source chain saw network)

Steir is a person with advanced thinking. When he found that the chains saw a lot of help to the logging work, he improved the chainsaw and allowed the factory to produce in batches, while applying for a invention patent for chainsaw.

These have benefited from Steel and the chainsaw production plant founded: his company has ranked first in the global chainsaw production production for many years, and he is also respected as the "father of chainsaw" by future generations.

Widely useful light and efficient

Since Still invented a new type of chainsaw, countries around the world have set off a boom in improving chainsaw and lasted for decades.

In 1959, Steel launched the ninth year of the real single -person operating oil saw in the real sense. A product that changed the chain saw industry -Kangli Light Oil Chain Saw was released. This oil chain saw is a direct drive method for the first time. There is no huge and heavy gear box. The weight of the single saw is less than 20 kg. It looks very similar to the modern chainsaw, and the design concept is very advanced.

For more than ten years, global chainsaw production has made rapid progress. By the early 1970s, with the universal use of small internal combustion engines, chainsaw production realized from the initial and heavy to light and efficient. The production of batch production in the United States, Sweden, Japan and other nationals can be operated by single -person operations.

Kangli light oil chain saw

Today, due to the needs of production and life, people use advanced technologies such as hydraulic transmission, ice crystal blades to develop different types of chainsaws, such as one -handed saw, concrete cutting saw, and high branch saws.

Due to different uses and operations, these chainsaws are divided into fixed and hand -as -as -type. The tooth -shaped sawing chips are generally made of pure steel, which have a variety of types such as section, round, chain. In the cartoon "Bear", the bald head is strong and holding the tree.

Picture source pexels

Interestingly, with the development of science, cesarean section replaced the original pubic bone combined cutting, so none of the many uses of modern chainsaw were pelvis for cutting mothers to facilitate the birth of the baby. The two Scottish doctors who invented the bracelet saw at the time of the spirit of heaven would see everything in the spirit of heaven?

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