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简体中文
Backpack weight principle
2018-12-21
To illustrate the problem, we may wish to make a hypothesis. We set two people with the same physical strength index. One person weighs 60KG and the weight is 25KG. Then the person weighs 85KG and the other person weighs 85KG. Then the two people bear the same weight. . If both of them walk 30 kilometers, who will prevail? You will definitely say that the freehand will be more advantageous. This setting may not be very reasonable, but it can explain the problem in a certain sense. Why do the freehands predominate? That is because the total weight of the freehander achieves the best combination with himself. According to the law of the force of the heavy load, we can draw a conclusion that the combination and reasonable gravity transfer is the most scientific weight bearing.
So how can we achieve a reasonable combination of gravity transfer? This involves a core technology of the backpack. Everyone knows that the core technology of backpack comfort and load-bearing lies in the design of the carrying system. The comfort and load-bearing of the carrying system need to solve those problems. I think at least four steps must be solved, namely stability, fit and ventilation. The rationality of gravity transmission, in fact, the four links are combined in the design of the burden.
A. Stability requirements First determine a reasonable focus. According to the weight bearing principle of the backpack, the lumbar socket above the tailbone is the main bearing point. The lumbar socket is connected to the top of the bilateral humerus. It is the main force area. The shoulders are the areas that support the force and balance. Therefore, the backpack should be solved in the force area. Load bearing point distribution. I think that the three-point support is the most reasonable way. The two fulcrums of the shoulders can be arranged to avoid lateral swing (rotation) of the backpack. The fulcrums of the waist and shoulders can be arranged up and down to avoid swinging (rotation) of the backpack, and the fulcrum of ventilation requirements. As little as possible, and stability requires at least three fulcrums, so the load bearing fulcrum is preferably a reasonable distribution of three points.
B. The problem to be solved is the reliable combination of the backpack and the body. The reliable combination is also a requirement for stability. The fit is required to be moderately tight, and the loose is not stable and the hoop is tight. Therefore, the design of the back fit is usually solved by the connection adjustment method. The belt is used to adjust the fit of the waist and the ankle, and the shoulder strap is used to adjust the upper part of the back. Fit, use the bottom of the bag to adjust the fit of the bottom of the backpack, and use the shoulders to adjust the fit on the top of the backpack. When you adjust the four fits, the feeling is the backpack and the body. Organically dissolved together.
C. Ventilation is to solve the heat problem. People will generate a lot of heat during exercise, especially in the hot season, it will be very difficult to dissipate heat, so it needs ventilation to dissipate heat. A good bag with a shoulder design to solve the stability and fit is usually to bulge the support point. The recessed part becomes an air passage, so that the heat in the movement is released in time.
D. Rationality of gravity transmission: The rationality of gravity transmission is the key to carrying the system, and to solve the rational transmission of gravity, we must first understand the law of gravity conduction. The ancestors of human beings have explored many valuable experiences in carrying heavy objects, such as the wooden barrels of the Portuguese, the recitals of the Nepalese, and the recitals of the drug collectors in the mountains of southern China, which are the classics of the human ancestors carrying heavy objects. The back they use has a common feature, that is, the shape is tapered.
How to understand the cone is the most reasonable way to transfer gravity? The weight of the object is transmitted from top to bottom by gravity. A large and small volume, the object is scattered above, gradually shrinking from top to bottom. Therefore, the center of gravity is gradually shrinking, and finally concentrated on the lower fulcrum. The size of this fulcrum should be close to the combination of the body and the force point. Therefore, the most important factor for the reasonable transmission of gravity is the shape of the back, so the reasonable shape of the backpack. It is also big and small, of course, it is also important to carry the system.
After knowing the rationality of gravity transmission, we still need to understand the scientific weight-bearing problem, that is, what kind of weight-bearing method is the most labor-saving? In the media, I often see such reports, carrying big bags and walking around the world, carrying big bags for camping. Going, objectively speaking, this statement is wrong. The concept of the back is that the shoulders are under load. The transmission of gravity is from shoulder to waist, from waist to squat, from squatting to legs to feet. In fact, the whole body is exerting force, multi-link force transmission, and increasing physical exertion is not difficult. Understand. If you bear the weight with your shoulders, you will have a sore back pain in the day. The scientific use of the mountaineering bag should be the main load-bearing force at the waist, and the center of gravity on the waist, reducing the transmission of load-bearing force and reducing unnecessary physical exertion. It is also natural to feel comfortable and relaxed on the back. The correct method of use should be to carry a large bag, and the shoulders only grasp the balance and assist the force. We should also tell them about the introduction of backpacks to customers.
So how can we achieve a reasonable combination of gravity transfer? This involves a core technology of the backpack. Everyone knows that the core technology of backpack comfort and load-bearing lies in the design of the carrying system. The comfort and load-bearing of the carrying system need to solve those problems. I think at least four steps must be solved, namely stability, fit and ventilation. The rationality of gravity transmission, in fact, the four links are combined in the design of the burden.
A. Stability requirements First determine a reasonable focus. According to the weight bearing principle of the backpack, the lumbar socket above the tailbone is the main bearing point. The lumbar socket is connected to the top of the bilateral humerus. It is the main force area. The shoulders are the areas that support the force and balance. Therefore, the backpack should be solved in the force area. Load bearing point distribution. I think that the three-point support is the most reasonable way. The two fulcrums of the shoulders can be arranged to avoid lateral swing (rotation) of the backpack. The fulcrums of the waist and shoulders can be arranged up and down to avoid swinging (rotation) of the backpack, and the fulcrum of ventilation requirements. As little as possible, and stability requires at least three fulcrums, so the load bearing fulcrum is preferably a reasonable distribution of three points.
B. The problem to be solved is the reliable combination of the backpack and the body. The reliable combination is also a requirement for stability. The fit is required to be moderately tight, and the loose is not stable and the hoop is tight. Therefore, the design of the back fit is usually solved by the connection adjustment method. The belt is used to adjust the fit of the waist and the ankle, and the shoulder strap is used to adjust the upper part of the back. Fit, use the bottom of the bag to adjust the fit of the bottom of the backpack, and use the shoulders to adjust the fit on the top of the backpack. When you adjust the four fits, the feeling is the backpack and the body. Organically dissolved together.
C. Ventilation is to solve the heat problem. People will generate a lot of heat during exercise, especially in the hot season, it will be very difficult to dissipate heat, so it needs ventilation to dissipate heat. A good bag with a shoulder design to solve the stability and fit is usually to bulge the support point. The recessed part becomes an air passage, so that the heat in the movement is released in time.
D. Rationality of gravity transmission: The rationality of gravity transmission is the key to carrying the system, and to solve the rational transmission of gravity, we must first understand the law of gravity conduction. The ancestors of human beings have explored many valuable experiences in carrying heavy objects, such as the wooden barrels of the Portuguese, the recitals of the Nepalese, and the recitals of the drug collectors in the mountains of southern China, which are the classics of the human ancestors carrying heavy objects. The back they use has a common feature, that is, the shape is tapered.
How to understand the cone is the most reasonable way to transfer gravity? The weight of the object is transmitted from top to bottom by gravity. A large and small volume, the object is scattered above, gradually shrinking from top to bottom. Therefore, the center of gravity is gradually shrinking, and finally concentrated on the lower fulcrum. The size of this fulcrum should be close to the combination of the body and the force point. Therefore, the most important factor for the reasonable transmission of gravity is the shape of the back, so the reasonable shape of the backpack. It is also big and small, of course, it is also important to carry the system.
After knowing the rationality of gravity transmission, we still need to understand the scientific weight-bearing problem, that is, what kind of weight-bearing method is the most labor-saving? In the media, I often see such reports, carrying big bags and walking around the world, carrying big bags for camping. Going, objectively speaking, this statement is wrong. The concept of the back is that the shoulders are under load. The transmission of gravity is from shoulder to waist, from waist to squat, from squatting to legs to feet. In fact, the whole body is exerting force, multi-link force transmission, and increasing physical exertion is not difficult. Understand. If you bear the weight with your shoulders, you will have a sore back pain in the day. The scientific use of the mountaineering bag should be the main load-bearing force at the waist, and the center of gravity on the waist, reducing the transmission of load-bearing force and reducing unnecessary physical exertion. It is also natural to feel comfortable and relaxed on the back. The correct method of use should be to carry a large bag, and the shoulders only grasp the balance and assist the force. We should also tell them about the introduction of backpacks to customers.
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