Helmet (Device To Protect The Head)
Helmet is a device to protect the head, a hat worn by soldiers during training and combat, and an indispensable tool in people’s traffic. Divided into military helmets, police helmets and civilian helmets. It is mostly semi-circular, mainly composed of three parts: shell, lining and suspension device. The shells are made of special steel, glass fiber reinforced plastic, reinforced plastic, leather, nylon and other materials to resist head damage from warheads, shrapnel and other striking objects.
Modern helmets are mainly composed of helmet shell, lining and suspension system. Due to the different requirements for various activities, there are many helmet structures and styles.
Generally, the shell of the helmet is made of high-strength materials, such as metal, engineering plastics, Kevlar FABRIC, etc., through its deformation to absorb most of the impact; the lining material is sweat-absorbing, warm-keeping, and shock-absorbing Functional, military helmets often have the function of further reducing the impact and preventing shell fragments from hurting the head; the suspension system is the part between the shell and the inner lining, which can usually be adjusted to suit different wearers. The difference in head shape.
Some special-purpose helmets are also equipped with earphones, microphones, and sockets for additional equipment such as cameras and lighting flashlights.
Helmets are used in military, construction, mining and some sports, such as American football, cycling, baseball, skiing, ice hockey, horse racing, equestrianism, sports, racing, locomotives, etc.
How to wear a helmet
The helmet should be worn horizontally, not tilting forward or backward. Some riders think that the front brim of the helmet is a bit blocking the line of sight, so they raise the helmet a lot to get a good line of sight. In fact, the brim can be removed to achieve the effect.
The correct helmet to wear is as follows:
Pay attention to the red and green dots on the picture. This is very important. The correct wearing of the helmet is the thickness of one finger of the helmet adjustment strap that crosses the ear (red dot), about 1.5 cm.
The entire strap is fixed on the lower jaw (green dot) instead of the throat, and the thickness of a finger is also left, about 1.5 cm.
1. The lighter the helmet, the better
Relatively speaking, the lighter the helmet, the better. But the lighter the riding helmet, the smaller the chance that it will pass the national safety certification test standards, and the higher the relative price. Therefore, the prerequisite for choosing a helmet is to pass the national safety certification test standard. Most helmets above 200 yuan can achieve about 260G. This weight will not make you tired even for a long distance, so don’t care too much about the weight index of the helmet. Unless you are for a bicycle race. Try to reduce your own weight, otherwise, it is not worth the extra silver to buy an ultra-lightweight helmet.
2. The bigger or more holes in the helmet, the more windy the helmet
Breathability is the key to the helmet, which can keep your head dry during long-distance riding. The more or larger the ventilation holes on the helmet, the greater the airflow around your head, and the cooler you will feel. However, please keep in mind that the more or larger the ventilation holes on the helmet, the more exposed your head will be, so the degree of protection will be reduced accordingly. Compared with mountain bike helmets, road bike helmets have more or larger ventilation holes. Similarly, road bikers have to consider the weight of their helmets more than mountain bikers. Generally speaking, the lighter the helmet, the more expensive it is. Therefore, unless you are doing a bicycle race, you should reduce your own weight as much as possible, otherwise, it is not worth the extra money to buy an ultra-lightweight bicycle helmet.
3. The small buckle and drawstring are related to life, and the buckle and drawstring will break if they cannot bear a certain force.
Everyone may only know that riding helmets need to be subjected to some impact tests, but the buckles and straps must also be subjected to corresponding tensile tests. If they fail the corresponding tensile tests, they cannot be used on the helmet. Therefore, a qualified riding helmet, small buckle and pull strap must pass the corresponding tests before it can be regarded as a helmet that meets the national safety certification test standards in the true sense.
4. The helmet is broken or used for an extended period of time
If it breaks, don’t use it. Wearing it is only a comfort for the heart. It is not of much substantial use. It does not matter if you make a small bump, but once the car is crashed and the strength is strong, it may not be able to play a protective role. . Don’t underestimate a crack, it has changed the helmet’s force and component effect in the physical structure. Do you know the cause of the collapse of a bridge in Seoul in the 1990s? Later, it was inferred that it might be caused by cracks that were not firmly welded at a certain welding spot on one side of the bridge deck. Changing the simple principle, you pull a piece of brand-new A4 paper from both ends forcefully, it may take a little effort to tear it off, but once you tear a small hole in the middle of the paper, it will be easy to tear the paper.
Regardless of whether they have fallen or collided, riders should change their riding helmets every three years. Because, although the helmet has not undergone a collision, sun exposure and sweat erosion will also age the helmet and some accessories, thereby weakening the safety factor and damaging the protective performance of the helmet.
5. Wear a helmet without straps
Unfastening the chin strap of the helmet may feel more comfortable, but if the head is hit, it will easily bounce off, and naturally it will not be able to protect it. Therefore, in order to play the protective role of the helmet, please wear the helmet chin strap at all times.
6. Wear a helmet that is too wide or narrow
If the helmet is not the correct size, it will not protect your head from the impact. Don’t make the mistake of buying an inappropriately sized helmet. To determine the correct size of the helmet, measure around the largest part of the head first, and then purchase the helmet according to this measurement. Because helmets are often divided into small, medium, and large sizes, you may only buy a relatively suitable size, and then use the size adjuster rotary button to adjust to achieve the most suitable size. After putting on the helmet, turn the helmet from one side to the other, from the front to the back, and feel whether it is comfortable to wear. If it is too loose or too tight, you need to continue to adjust or replace it.
Bicycle helmets can be divided into: downhill helmets, ordinary riding helmets
Horse riding can be divided into: equestrian helmet, knight helmet, horse racing helmet
Other sports helmets can be divided into: skateboard helmets, mountain climbing helmet, roller skating helmets (downhill helmets, stunt helmets), ice hockey helmets, baseball helmets, speed skating helmets, skating helmets, ski helmets, skating helmets, hockey helmets, football helmets, and dry helmets. Ice helmet, hip-hop helmet, extreme sports helmet
All athletes must wear ice hockey helmets, and referees and sideline referees can also wear helmets. For competitions in the age group of 20 years or younger approved by the International Ice Federation, athletes must wear a full face shield whose structure should be able to block the passage of ice hockey or ice hockey stick blades.
1. EPS (polypropylene ethylene) helmet, the inside of the helmet is polypropylene, and the outside is a shell made of plastic.
2. ABS (engineering plastic) hard plastic shell with EPS (polypropylene ethylene) lining, mostly used for extreme roller skating and FSK and other projects. Mainly used to prevent collisions with hard objects and protect the head.
3. ABS (engineering plastic) hard plastic shell with hard sponge lining, mostly used in ice hockey and in-line skating. It is mainly used to prevent collisions with hard objects and protect the head from the impact of ice hockey. Many helmets can be fitted with plexiglass or wire-welded face protection nets.
4. The helmet with palate protection is basically glass fiber or carbon fiber shell with EPS lining. Some varieties are made of pure EPS, and the part of the palate protection can be removed. This type of helmet is used for roller skating downhill.
5. Aerodynamic helmets are basically made of glass fiber or carbon fiber shell paste, the surface is very smooth, and some are lined with EPS. The shape is very unique, the front part is a large goggles, half of the face is covered, the back part of the helmet is very long, and the part of the neck that meets the back is rectified when sliding to reduce air resistance. Therefore it is called an aerodynamic helmet.
Americans like rugby. The audience is very excited to see athletes in full protective clothing running, falling, and scoring touchdowns on the field. However, while this kind of strenuous exercise brings excitement and excitement to the audience, it also brings serious injuries to the athletes, especially head injuries. Therefore, rugby must wear a special helmet.
The ski helmet is made of hard plastic molded or glass fiber reinforced plastic shell. The helmet has an impact-resistant EPS inner shell and a special, matching, comfortable and elastic inner lining insulation layer. The entire helmet is streamlined, relatively light, and does not affect the field of vision. It is worn by skiers. There is a sense of security. Helmets are generally divided into full helmets and half helmets. Half helmets are suitable for skills, so that they can hear various sounds from the outside world and have a heat dissipation function; full helmets are suitable for speed competitions. Ski helmets are often used for alpine skiing downhill and super-giant slalom, ski jumping, aerials, etc.