Since the bicycle was invented, they gradually become better means of transport, leisure tool, espe

Since the bicycle was invented, they gradually become better means of transport, leisure tool, especially after cycling to become a competitive sport, it is that people love me. But the speed of run-off as a sport, security has become an important issue. So, people think of the helmet. luftpolsterumschlag Bicycle helmet appears not only to protect the rider's safety, but also improve the performance of athletes racing. As early as the 1880s, some of the high-wheeler riding club who first discovered the benefits of helmet use, and later, with the increase of hard asphalt and stone road, head injury when cycling accidents also increased, pith helmet made it came into being. Wood pulp is able to absorb the impact force of a cushioning luftpolsterumschlag material, but this soon gave way to a kind of helmet design refillable leather surface, luftpolsterumschlag this design lasted until the 1970s. This helmet was originally called "Portal" because it has long holster a filler strip, like a net over the head. This helmet is very attractive, which has a soft quality leather luftpolsterumschlag wrapped foam filler. Although this helmet really can protect the rider's ears hurt not rub the ground hurt or bruised. But it is regrettable that it is anti-poor impact properties. Soft helmet is an important development, this helmet looks a bit like a bowl vented, this helmet is made of polystyrene materials, including synthetic elastic fiber material (LYCRA), and later joined in the back side of the bubble pad. Bicycle helmet firmly anti-impact standards and buckling forces are mid-1970s by the U.S. Consumer Products Safety Commission (CPSC) proposed. luftpolsterumschlag This or that project parameters are presented according to different institutions, such as the SNELL Foundation, the American National Standards Institute and the American luftpolsterumschlag Society for material detection. At that time, only a lightweight motorcycle helmets meet this standard. However, the cyclist refused to wear this helmet, because this helmet luftpolsterumschlag and heavy and airtight. To this end, BeLL Biker company first developed a bike helmet meets CPSC standards, it is made of ABS plastic shell, made of polystyrene foam wrapped. Later updates PVC shell material and the higher price of materials significantly reduce the weight of the polycarbonate helmet. Generally, bicycle helmets at least twice to be able to withstand the impact process, and the other is the first time rider or car collision avoidance, and the second is the rider himself fall hit the ground, and these materials These two have a good impact cushioning luftpolsterumschlag effect. Since bicycle helmets appear in the shape of many changes occurred. Round outdated helmet, helmet border now become smaller, luftpolsterumschlag and the vent also has changed a lot, really played a cool effect but also breathable aerodynamic. As this year's first international bicycle supplies exhibition on display Limar F111-type bicycle luftpolsterumschlag helmets gap of up to 37, and last year the largest luftpolsterumschlag pores is also just 23 helmet. luftpolsterumschlag In addition to road cycling helmet, but with the advent of mountain biking, the car also appears a helmet. If BELL X-RAY, its head is large, and road type helmet less aerodynamic than other principles, the main function of these helmets are in hot climatic conditions allow sweat to evaporate at low speed. As of today COOLMAX LINERS helmet, helmet almost these multifunctional, as it can help the absorption of moisture. In general, most helmet fell backwards when athletes luftpolsterumschlag do not play any role. This is caused by the helmet manufacturer's attention, for GIRO company developed a positioning system to ensure that the back of the head in the helmet closely. If ROCLOC type helmet with toothed buckle is an initiative of the company, the company also uses 10 kinds of positions to adjust the helmet to ensure the appropriateness of the helmet. The change SPORTSCOPE helmet style changed common system, launched luftpolsterumschlag with six strength, there is flexibility nylon mesh material patchwork, luftpolsterumschlag all into one piece of material designed for users requirements. luftpolsterumschlag This eliminates the need for helmet pad, and can reduce the distance between the helmet and skull. Bicycle helmets feature protects the rider of life is indisputable. According to the report by the U.S. Insurance Highway luftpolsterumschlag Safety luftpolsterumschlag study showed: the number of U.S. deaths in 1999, 98 cyclists \% were not wearing a helmet, while wearing a helmet luftpolsterumschlag in the crash accident risk factor who make their head injuries decreased by 85 \%. Another helmet not only make people feel cool, but really cool. Meanwhile, the vent allows the helmet on the head feel more cool. With the old saying, a clear mind and better access to race victory. Finally, to add the principle of helmets protect luftpolsterumschlag the head is wearing a helmet hit in the head can stop relatively slowly, not wearing a helmet hit the ground if the head, causing bleeding often causes brain edema, and helmets luftpolsterumschlag polymerization of balls but it can absorb the impact force to prevent the occurrence of these unfortunate events. Bicycle helmets can prevent brain damage? Australia, a person luftpolsterumschlag riding a bicycle action group recently published a controversial new study reported that a bicycle helmet does not prevent severe brain damage, there is no scientific evidence to support the mandatory application of the kind of helmet. (Accid Anal Prev 2003,35287) Australia Chairman bike ride Rights Action Group Curnow said their study concluded that the results of 16 trials published between 1998 and 1987 to conduct a comprehensive analysis of the results, the conclusion of the Australian police mandatory Application luftpolsterumschlag bike helmet luftpolsterumschlag questioned. Another study by researchers at the completion of the Australian Transport Safety Bureau also show that the helmet does not prevent serious brain damage. Curnow said that although helmets can reduce minor head injury, luftpolsterumschlag but can not prevent severe brain damage. Canberra luftpolsterumschlag team leader, said he does not deny that the helmet can help prevent injuries such as scalp scalp abrasions and lacerations, etc.; helmet with a hard shell to prevent damage to the skull, thus helping to prevent brain damage. However, most current applications are soft helmet shell, their ability to prevent head injuries become a problem. As a road safety measure, many countries around the world are promoting the use of helmets for adults and children. Australia is one of the first countries in the law to force cyclists to wear helmets, which began in 1992. Curnow, etc. on the mechanisms of brain injury luftpolsterumschlag 16 trials conducted serious research, analysis which is due to skull fracture or angular acceleration (rotation and sliding along the brain within luftpolsterumschlag the skull side) due. He said there are important scientific evidence that the angular acceleration is the main cause of brain damage, but most of the helmet is designed to resist linear acceleration. Linear acceleration forces caused by rapid acceleration skull, luftpolsterumschlag hit the nearest brain tissue. According to the above theory, to protect brain tissue, helmets absorb some impact energy should reduce the rate of deceleration. The current standard helmet design and testing is still in use credible theory that linear acceleration is the main cause of brain damage, but it ignores the angle of rotation. Craniofacial soft helmet hit close, the head rotates and generates a strong angular acceleration. The designer did not consider reducing the angular acceleration of the helmet, which is the main reason for brain damage. But road safety experts do not agree with these ideas, insisting that reduce the incidence of bicycle helmets are related to brain injury. luftpolsterumschlag Clinton of the Royal Society for the Prevention of Accidents, said the British Ministry of Transport has recently published a review of the comments after a comprehensive analysis of all the available research data concludes that helmets luftpolsterumschlag help protect cyclists, especially children. He said, in any sense, not the rider's helmet most important safety measures, but effective. [Article taken from http://www.xyjt.org/Article/ShowArticle.asp?ArticleID=207]
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