Helmet

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helmet is a protective form used to protect the head from injury. More specifically, helmets help the skull in protecting the human brain. Ceremonial or symbolic helmets (eg British police helmets) without protective functions are sometimes used. The longest known use of helmets was by the Assyrian army in 900 BC, who wore thick leather or bronze helmets to protect heads from blunt objects and sword blows and arrow attacks in combat. Soldiers wear helmets, often made of lightweight plastic materials.

In civil life, helmets are used for recreational and sports activities (eg jockeys in horse racing, American soccer, ice hockey, cricket, baseball, camogie, throwing and rock climbing); hazardous work activities (eg construction, mining, riot police); and transportation (eg motorcycle helmets and bicycle helmets). Since the 1990s, most of the helmets are made of resin or plastic, which can be reinforced with fibers such as aramid.

The word helmet is very small from , the medieval word for protective combat headgear. Large medieval helmets cover the entire head and are often accompanied by camails that protect the throat and neck as well. Initially helm is a helmet that covers his head only partially.

Video Helmet

Design

Helmets try to protect the user's head by absorbing mechanical energy and protecting against penetration. Their protective structures and capacities are altered in high-energy impacts. In addition to their energy absorption capacity, their volume and weight are also an important issue, as higher volume and weight increase the risk of injury to the user's head and neck. Anatomical helmets tailored to the inner head structure were discovered by neurosurgeons at the end of the 20th century.

Helmets used for different purposes have different designs. For example, a bicycle helmet should protect against the blunt collision force from the head of the wearer who hit the road. Helmets designed for rock climbing should protect from heavy collisions, and against objects such as small stones and climbing equipment falling from the top. Practical concerns also dictate helmet design: the cycling helmet must be aerodynamic and well-ventilated, while the rock climbing helmets should be light and small so as not to disrupt the climb.

Some helmets have other protective elements attached to them, such as face shields or sunglasses or facial cages, or ear cages or ear plugs and other forms of protective headgear, and communication systems. Sports helmets may have an integrated metal face shield (facial cage).

Batting baseball helmets have extended protection in the ears, which protect the jaw from injury.
Motorcycle helmets often have flip-down screens for rain and wind protection, and they may also have projection visors to protect the eyes from glare.
Hard hats for construction workers are used primarily to protect the wearer from falling objects such as tools.
Helmets for riot police often have clear visor protectors and thick pads to protect the back of the neck.
Modern fire fighters protect the face and back of the head against impact, fire and electricity, and may include masks, communication systems, and other accessories.
Welding helmet protects the eyes and face and neck from burning flash, ultraviolet rays, sparks and heat. They have a small window, called a lens shade, where the welder sees welds; for welding this window arc should be much darker than in welding torch glasses and sunglasses.
People with some medical conditions should use a helmet to protect the brain, because of a gap in the brain cranium, eg. because of cleidocranial dysostosis or to separate craniopagus twins.
Mixed martial arts helmets have ear pads to prevent serious injuries to athletes, who usually do not hold such force to the ear.
Some water sport helmets, such as for underwater hockey or water polo, have ear cages designed to help prevent the eardrum from ruptures caused by excessive water pressure from contact or percussion from other equipment involved in the sport./li>
The crash helmets for F1 drivers, their design and construction have evolved enormously. However, head and neck trauma remains the biggest driver injury risk.

Materials

Historically, helmets have been made from a variety of materials, including various metals, plastics, leather, and even some fibrous materials such as Kevlar. Ancient and medieval helmets are usually made of metal, often bronze, iron or steel, although some pig ivory helmets are known by ancient Mycenae.

Some British goalkeepers during the 18th and 19th centuries wore straw-made helmets tied together with cut thorns. Developed in the mid-19th century, the pith helmet, made of pith or cork, is often worn by Europeans in the tropics.

Military applications in the late 19th century saw a number of leather helmets, especially among pilots and tank crews in the early 20th century. In the early days of the car, some riders also adopted this headgear style, and early football helmets were also made of leather. In World War II, American, Soviet, German, Italian and French aircraft crew were wearing leather helmets, German pilots disguised their berets before throwing them both and switching to a cloth cap. The Era of First World War and Second also saw the rise of metal military helmets, especially the helmets of Brodie and Stahlhelm.

Modern helmets have a much wider range of applications, including helmets tailored to the specific needs of many athletic and workplace activities, and these very often incorporate plastics and other synthetic materials for their light weight and shock absorption. Some types of synthetic fibers used to make helmets in the 21st century include Aramid, Kevlar, and Twaron.

Maps Helmet

Helmet type

Helmets of various kinds have been developed during the course of human history. Most of the earliest helmets have military use, although some may have more ceremonies than battle-related purposes.

Two types of helmets that were important to be developed in ancient times were the Corinthian helmet and the Roman galea.

During the Middle Ages, many different military helmets and several ceremonial helmets were developed, almost all made of metal. Some of the more important medieval developments include large helmets, bascinet, frog helmet, and armet.

Owain Glynd great seal? R (approx 1359 - c 1415) describes the prince of Wales & amp; His stallions are in full armor, they both wear headbands with Owain's golden dragon mounted on top, this would be impractical in battle so as this would be ceremonial.

In the nineteenth century, more material was included, ie skin, taste and digest. The pith helmet and pickelhaube skin are an important 19th century development. The greatest expansion in the various forms and composition of helmets, however, occurred in the 20th century, with the development of highly specialized helmets for many athletic and professional applications, as well as the emergence of modern plastics. During World War I, the French army developed the Adrian helmet, the British developed the Brodie helmet, and the Germans produced the Stahlhelm.

Flight helmets were also developed throughout the 20th century. A number of athletic helmets, including soccer helmets, batting helmets, cricket helmets, bicycle helmets, motorcycle helmets, and racing helmets, were also developed in the 20th century.

Helmets since the mid-20th century often incorporate lightweight plastics and other synthetic materials, and their use has become very special. Some important recent developments include the French SPECTRA helmet, Spanish MARTE helmet or the American PASGT (commonly called "Kevlar" by US forces) and Advanced Combat Helmet, or ACH.

Giro Switchblade MIPS Helmet - 2018 - Fanatik Bike Co.

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Heraldry

Since the emblem was originally designed to distinguish noble combatants on battlefields or in tournaments, even when covered with armor, it is not surprising that the heraldic element constantly incorporates shields and helmets, this is often the most visible part of military knight equipment.

A common practice is to display a helmet as part of a symbol, above the shield, a practice that is maintained long after the helmet itself ceases to be used. In the German symbol, the helmet was even considered inseparable from the shield, in contrast to the British emblem, where the practice of displaying helmets and emblems alone without any shields became fashionable in Victorian times. In most medieval news traditions, the style, color and position of the helmet become a symbol of the carrier rank. The rank is also often denoted by the coronet, usually either past the shield or placed on a helmet.

Practices that show titles of nobility through the appearance of a barred or roasted helmet first appeared around 1587-1615, and the news conventions displaying helmets of rank in Great Britain, which came into fashion around Stuart times, are as follows:

Sovereign: golden helmet (tournament) put affrontÃƒ Â© Ã‚ Â©
Peer helmets: silver face helmet (tournament) placed in profile
Knight or baronet helmet: steel helmet (previous jousting helmet, closer steering) placed with affrontÃƒ Â© Ã‚ Â© with open visor
Esquire helmet: steel helmet placed on profile with closed visor

Namun, gulungan-gulungan senjata yang lebih awal mengungkapkan bahwa helm-helm awal biri-biri digambarkan dengan cara yang setia pada gaya-gaya dalam penggunaan militer atau turnamen yang sebenarnya pada saat itu.