Motorcycle helmet

Helmet Developers. This area includes the only diamond mines in Canada. Some well-known manufacturers of motorcycle helmets are:. Another land claims agreement with the Dogrib nation created a region within the NWT called Tli Cho, between Great Bear and Great Slave Lakes, which will give the Dogrib their own legislative bodies, taxes, resource royalties, and other affairs, though the NWT will still maintain control over such areas as health and education. Besides as protection in vehicle crashes, the full face motorcycle helmet is sometimes used in robberies and other crimes and in riots, as a mask to prevent recognition and to protect the head from injury by weapon, as at Riot control#Helmets. Land claims in the NWT culminated with the creation of the Inuit homeland of Nunavut, the result of the largest land claim in Canadian history. This choice is described in greater detail in the standards section. Another issue is historic racial tension based on the bloody history between the Dene and the Inuit, who nevertheless have taken recent steps towards reconciliation.

Most standard helmet tests use speeds between 5 and 7 m/s. Their cancer rates skyrocketed due to lack of safety procedures that were available to their white colleagues. In practice, motorcycle helmet manufacturers choose the impact speed they will design for based on the speed used in standard helmet tests. Aboriginal issues in the NWT include the fate of the Dene who, in the 1940s, were employed to carry radioactive uranium ore from the mines on Great Bear Lake. So helmets help most in impacts at the speeds they were designed for, and continue to help but not as much in impacts that are at different speeds. The member of Parliament for the Western Arctic, the riding that comprises Northwest Territories, is Dennis Bevington. Still, a helmet with a stiffer foam that stopped the head before the liner crush space ran out would have done a better job. The Premier of Northwest Territories is Joe Handley.

However, in the absence of the helmet, the head would have been brought to a sudden stop from a higher speed causing more injury. The legislature then began electing a cabinet and Government Leader later known as the Premier. When the crush space of the liner runs out, the head will stop suddenly which is not ideal. The Commissioner had full governmental powers until 1980 when the territories were given greater self government. If the impact is faster than the one the helmet was designed for, the head will completely crush the liner and slow down but not stop in the process. The head of state for the territories is a Commissioner appointed by the federal government. If the helmet is in a real impact that is slower than the one for which it was designed, it will still help but the head will be decelerated a little more violently than was actually necessary given the available space between the inside and outside of the helmet, although that deceleration will still be much less than what is would have been in the absence of the helmet. The territory's most recent general election was on November 24, 2003.

The result is that the manufacturer must choose a likely speed of impact and optimize the helmet for that impact speed. Seven MLAs are also chosen as cabinet ministers, with the remainder forming the opposition. It depends on the impact speed of the head, which is of course unknown at the time of manufacture of the helmet. After each general election, the new parliament elects a premier and speaker by secret ballot. So how stiff is that? The answer, significantly, is that it depends. This group is composed of one member elected from each of the nineteen constituencies. This means that an ideal helmet liner is stiff enough to decelerate the impacting head to a dead stop in a smooth uniform manner just before it completely crushes the liner and no stiffer. It is a consensus government called the Legislative Assembly.

The head cannot move any further so after crushing the liner it comes suddenly to a dead stop, causing high accelerations that injure the brain. Unlike provincial governments, the Government of Northwest Territories does not have political parties, except for the period between 1898 and 1905. What happens then? Well, beyond the liner is a hard plastic shell and beyond that is whatever the helmet is hitting, which is presumably an unyielding surface. Unlike lieutenant-governors, the commissioner is not a formal representative of the Queen of Canada. If the liner is too soft, the head will crush it completely upon impact without coming to a stop. Since 1985 the Commissioner no longer chairs meetings of the Executive Council (or cabinet) and the federal government has instructed commissioners to behave like a provincial lieutenant-governor. This implies a limit to how soft the liner can be. The position used to be more administrative and governmental but with the devolution of more and more powers to the elected assembly since 1967 the position has become symbolic.

Unfortunately, there is a limit to how thick the helmet can be for the simple reason that the helmet quickly becomes impractical if the liner is more than 1 or 2 inches thick. The Commissioner of NWT is the chief executive and is appointed by the federal Minister of Indian Affairs and Northern Development. It is clear then that it is very important that the liner in a motorcycle helmet is soft and thick so the head decelerates at a gentle rate as it sinks into it. [3] Devolution of powers to the territory was an issue in the 20th general election in 2003, and has been ever since the territory began electing members in 1881. Small blood vessels are also damaged causing bleeding (petechial hemorrhages) deep within the brain. During his term, Premier Kakfwi pushed to have the federal government accord more rights to the territory, including having a greater share of the returns from the territory's natural resources go to the territory. This movement produces stretching and tearing of axons (diffuse axonal injury) and the insulating myelin sheath, injuries which are the major cause of loss of consciousness in a head trauma. As a territory, Northwest Territories has fewer rights than the provinces do.

The resulting shearing forces cause different levels in the brain to move relative to one another. Major Territorial Mines. These forces, associated with the rapid acceleration and deceleration of the head, are smallest at the point of rotation of the brain near the lower end of the brain stem and successively increase at increasing distances from this point. However, their exploitation has raised environmental concerns, not least the potential havoc that a spill from tailings ponds would cause to unspoiled wilderness areas such as the Nahanni National Park Reserve, a UNESCO World Heritage Site. In these situations rotational forces such as might occur in whiplash-type injuries are particularly important. In particular, NWT diamonds are touted as an ethical alternative that allays risks of supporting conflicts by purchasing blood diamonds. Another characteristic, susceptibility to shearing forces, plays a role primarily in injuries which involve rapid and forceful movements of the head, such as in motor vehicle accidents. The territory enjoys vast geological resources including diamonds, gold, and natural gas.

Blood vessels linking the brain to the inside of the skull may also break during this process, causing dangerous bleeds. [1] [2] In Inuktitut, Northwest Territories are referred to as ᓄᓇᑦᓯᐊᖅ (Nunatsiaq), "beautiful land.". Then the brain rebounds in the opposite direction, stretching the tissue near the impact site and squeezing the tissue on the other side of the head. This name arguably became more appropriate following division, than it was when the territory extended far into Canada's northeast. During an impact to the front of the head, the brain lurches forwards inside the skull, squeezing the tissue near the impact site and stretching the tissue on the opposite side of the head. The idea is favoured by former premier Stephen Kakfwi among others, but a poll conducted prior to division showed strong support for retaining the name "Northwest Territories". Think of how you lurch backwards and forwards while standing on a bus as it accelerates or stops. One proposal is "Denendeh" ("our land" in Dene).

Closed head injury results from violent acceleration of the head which causes the brain to move around inside the skull. There was some discussion of changing the name of Northwest Territories after the separation of Nunavut, possibly to a term from an Aboriginal language. The most common type of head injury in motorcycle accidents is closed head injury, meaning injury in which the skull is not broken as distinct from an open head injury like a bullet wound. Finally, on April 1, 1999, the eastern three-fifths of Northwest Territories (including all of Keewatin district and much of Mackenzie and Franklin) became a separate territory called Nunavut. Therefore, the primary purpose of a helmet is to prevent traumatic brain injury while skull and face injuries are a significant secondary concern. Between 1925 and 1999, the Northwest Territories measured 3 439 296 km² – larger than India. They frequently result in death, permanent disability or personality change and, unlike bone, neurological tissue has very limited ability to recover after an injury. In 1912 the Government of Canada dropped the hyphen in North-West Territories name to Northwest Territories.

Brain injuries are much more serious. However, in 1925 the boundaries of the NWT were extended all the way to the North Pole on the sector principle, vastly expanding its territory onto the northern ice cap. Skull fractures are usually not life threatening unless the fracture is depressed and impinges on the brain beneath and bone fractures usually heal over a relatively short period. This left only the districts of Mackenzie, Franklin (which absorbed the remnants of Ungava in 1920), and Keewatin. The common perception that a helmet's purpose is to save you from splitting your head open is misleading. The provinces of Alberta and Saskatchewan were created in 1905, and Manitoba, Ontario, and Quebec acquired the last of their modern territories from the NWT in 1912. To understand the action of a helmet, it is first necessary to understand the mechanism of head injury. Quebec was also extended, in 1898, and Yukon was made a separate territory in the same year to deal with the Klondike Gold Rush, and remove the NWT government from administering the sudden boom of population, economic activity and influx of non-Canadians.

The purpose of the foam liner is to crush during an impact, thereby increasing the distance and period of time over which the helmet stops and reducing its acceleration. In the meantime, Ontario was enlarged northwestward in 1882. The purpose of the hard outer shell is. See also: Districts of Northwest Territories. The conventional motorcycle helmet has two principal protective components: a thin, hard, outer shell made of acrylonitrile butadiene styrene (ABS) plastic, fiberglass or kevlar and a soft, thick, inner liner usually made of expanded polystyrene foam or expanded polypropylene foam. Keewatin would be returned to NWT in 1905. For the best protection, helmets should be replaced after any impact, and every three or so years even if no impact is known to have occurred. In 1882 and again in 1896, the remaining portion was divided into the following districts (corresponding to the following modern-day areas):.

Note that impacts may, of course, come from things other than crashing, such a dropping a helmet, and may not cause any externally visible damage. In 1876, the District of Keewatin, at the centre of the territory, was separated from it. Motorcycle helmets are generally designed to break in a crash (thus expending the energy otherwise destined for the wearer's skull), so they provide little or no protection after their first impact. In 1882 Regina in the then-District of Assiniboia became the territorial capital; after Alberta and Saskatchewan became provinces in 1905 Regina became the provincial capital of the new province of Saskatchewan. They generally have fabric and foam interiors for both comfort and protection. By the time British Columbia joined confederation in 1871, it had already been granted the portion of the North-Western Territory south of 60 degrees north and west of 120 degrees west. Modern helmets are constructed from plastics, often reinforced with kevlar or carbon fiber. The province of Manitoba was created in 1870, a tiny square around Winnipeg, and then enlarged in 1881 to a square region composing the modern province's south.

Some motorcycle helmets have a built-in so-called MROS (Multiple Reflective Optic System): a set of reflective surfaces inside the helmet which together function as a rear-view mirror [1]. After the transfer, the territories were gradually whittled away. A "novelty helmet" can protect the scalp against sunburn while riding and - if it stays on during a crash - might protect the scalp against abrasion, but it has no capability to protect the skull or brain. The name of the territory is traced to North-Western Territory, a region named for the geographical location relative to Rupert's Land. Such helmets are often smaller and lighter than DOT-approved helmets, and are unsuitable for crash protection because they lack the energy-absorbing foam that protects the brain by allowing it to come to a gradual stop during an impact. It also excluded the Arctic Islands except the southern half of Baffin Island; these remained under direct British rule until 1880. There are other helmets - often called "beanies" or "novelty helmets" - which are not certified and generally only used to provide the illusion of compliance with mandatory helmet laws. This immense region comprised all of modern Canada except British Columbia, the coast of the Great Lakes, the Saint Lawrence River valley and the southern third of Quebec, the Maritimes, Newfoundland, and the Labrador coast.

All of these types of helmets are secured by a chin strap, and their protective benefits are greatly reduced if the chin strap is not fastened. The territory was created in 1870, when the Hudson's Bay Company transferred Rupert's Land and North-Western Territory to the government of Canada – forming the Northwest Territories. The rider may thus eat or drink without unfastening the chinstrap and removing the helmet. They decided that if French was to be an official language, then so must the other languages in the territories. A subset called "Convertible", "Flip-face" or "Flip-up" is also available; in these helmets, the chin bar pivots upwards (or, in some cases, may be removed). The executive council appointed a special committee of MLAs to study the matter. From most to least protective, they are:. Some native members walked out of the assembly, protesting that they would not be permitted to speak their own language.

There are three basic types of motorcycle helmets. In the early 1980s, the government of Northwest Territories was again under pressure by the federal government to reintroduce French as an official language. Modern standards setters choose the severity of the standard test impact to be somewhere between these two extremes, so that manufacturers are doing their best to protect the riders who can be helped by their helmet during a head impact. After some conflict with Ottawa and a decisive vote on January 19, 1892, the issue was put to rest as an English-only territory. On the other hand, if an impact is so mild that the rider is unlikely to be injured at all so long as he is wearing a helmet than that impact is not a demanding test. The members voted on more than one occasion to nullify and make English the only language used in the assembly. If currently available data suggest that the rider is unlikely to survive in such an impact, regardless of how well his helmet performs, then there is little point in demanding that helmets be optimized for this impact. Governor Joseph Royal.

It is possible to deduce how well the 'perfect' helmet outlined in the Function section of this page would perform in an impact of a given severity. French was made an official language in 1877 by the appointed government, after lengthy and bitter debate resulting from a speech from the throne in 1888 by Lt. The speeds are chosen based on modern knowledge of the human tolerance for head impact, which is by no means complete. Citizens of the NWT have a right to use any of the above languages:. Some of these are more severe than the impacts used in the standard tests and some are less so. The territory's Official Languages Act recognizes eight official languages, more than any other political division in Canada:. Overall, there is a very wide range of severity in the impacts that could conceivably happen in a motorcycle impact. .

So a perpendicular impact against a flat steel anvil at 5 m/s might be about as severe as a 30 m/s oblique impact against a concrete surface or a 30 m/s perpendicular impact against a sheet metal car door or windscreen. The highest point is Mount Nirvana near the border with Yukon at elevation 2773 m (9098 ft). The sheet metal wall of a car door may bend inwards to a depth of 7.5 - 10 cm (3 - 4 inches) during a helmeted head impact, meaning that it generates more stopping distance for the rider's head than the helmet itself. In the Arctic Archipelago, the Northwest Territories includes Banks Island, Parry Peninsula, Prince Patrick Island, and parts of Victoria Island and Melville Island. The other vital factor in determining the severity of an impact is the nature of the surface struck. Geographical features include the vast Great Bear and Great Slave Lakes, as well as the immense Mackenzie River and the canyons of the Nahanni River, a national park and UNESCO World Heritage Site. Of course, other surfaces are perpendicular to the motorcylists velocity such as trees, walls and the sides of other vehicles. Its capital has been Yellowknife since 1967; see also List of Northwest Territories capitals and List of communities in Northwest Territories.

For example, the surface of the road is almost parallel to the direction the motorcyclist moves in so only a small component of his velocity is directed perpendicular to the road while he is riding. It has an area of 1,171,918 square kilometres and a population of 42,944 as of January 1, 2005. This confusion is relieved by understanding that the perpendicular impact speed of the helmet is usually not the same as the road speed of the motor cycle and that the severity of the impact is determined not only by the speed of the head but also by the nature of the surface it hits. Located in northern Canada, it is east of Yukon, west and south of Nunavut (Canada's two other territories), and north of British Columbia, Alberta, and Saskatchewan. At first glance, this is confusing given that motorcyclists frequently ride at speeds of 20 or 30 m/s. The Northwest Territories (NWT; French, les Territoires du Nord-Ouest) is a territory of Canada. Most motorcycle helmet standards use impacts at speeds between 4 and 7 m/s. Colomac Mine - 1990-1992, 1994-1997 (gold).

drag racing, bicycling, horseback riding), and many riders in North America consider Snell certification a benefit when considering buying a helmet. Salmita Mine - 1983-1987 (gold). The Snell Memorial Foundation has developed stricter requirements and testing procedures for motorcycle helmets, as well as helmets for other activities (e.g. Tundra Mine - 1964-1968 (gold). Of the above standards, the DOT standard is by far the most lax. Terra Mine - 1969-1985 (silver and copper). Among them are:. Rayrock Mine - 1957-1959 (uranium).

Worldwide, many developed countries have defined their own sets of standards that are used to judge the effectiveness of a motorcycle helmet in an accident, and define the minimal acceptable standard thereof. Cantung Mine - 1962-1986, 2002-2003, 2005-current (tungsten). In some countries, most notably the USA, there is significant popular opposition to compulsory helmet use, based on these safety and also philosophical objections (see Helmet law defense league). Pine Point Mine - 1964-1988 (lead and zinc). As with seat belt legislation the actual effects of imposing helmet wearing are a matter of dispute with evidence available indicating a risk compensation effect. Diavik Diamond Mine - 2003-current (diamonds). These laws vary considerably, often exempting mopeds and other small-displacement bikes. Ekati Diamond Mine - 1998-current (diamonds).

Motorcycle helmets are generally believed to greatly reduce injuries and fatalities in motorcycle accidents, thus many countries have laws requiring acceptable helmets to be worn by motorcycle riders. Echo Bay Mine - 1964-1975 (silver and copper). . Eldorado Mine - 1933-1940, 1942-1960, 1976-1982 (radium, uranium, silver, copper). The primary goal of a motorcycle helmet is to protect the rider's head during impact, although many helmets provide additional conveniences, such as face shields, ear protection, intercom etc. Camlaren Mine - 1962-1963, 1980-1981 (gold). A motorcycle helmet is a type of protective headgear used by motorcycle riders. Discovery Mine - 1950-1969 (gold).

Philips (scalp-like membrane to protect against rotational injury). Thompson-Lundmark Mine - 1941-1943, 1947-1949 (gold). Z1R. Negus Mine - 1939-1952 (gold). Suomy. Ptarmigan and Tom Mine - 1941-1942, 1986-1997 (gold). Shoei (pronounced show-eh). Giant Mine - 1948-2004 (gold).

Schuberth. Con Mine - 1938-2003 (gold). Nolan. Yukon (modern Yukon Territory). HJC. Ungava (modern-day northern Quebec and inland Labrador, as well as an offshore area in Hudson Bay);. Bell. Saskatchewan (central Saskatchewan);.

Arai. Mackenzie (mainland NWT and western Nunavut);. AGV. Franklin (the Arctic islands and Boothia and Melville Peninsulas);. This is important because the foams used have very little resistance to penetration and abrasion. Athabaska (northern Alberta and Saskatchewan);. to provide structure to the inner liner so it does not disintegrate upon abrasive contact with pavement. Assiniboia (southern Saskatchewan);.

to prevent penetration of the helmet by a pointed object that might otherwise puncture the skull, and. Alberta (southern Alberta);. DOT FMVSS 218 (USA). NWT Literacy Council: Languages of the Land. BS 6658 (United Kingdom). Language Commissioner of Northwest Territories. NZ 5430 (New Zealand). Justifying the end of Official Billingualism in Northwest Territories.

JIS T8133 (Japan). in debates and proceedings of the legislature. 22 (Europe). in court;. UN/ECE Regulation No. when receiving services from the government;. CSA CAN3-D230-M85 (Canada). Slavey (proper).

AS 1698 (Australia). Mountain, and. Hare. Bearlake. Slavey, including