1.
Inclined plane
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An inclined plane, also known as a ramp, is a flat supporting surface tilted at an angle, with one end higher than the other, used as an aid for raising or lowering a load. The inclined plane is one of the six simple machines defined by Renaissance scientists. Moving an object up an inclined plane requires less force than lifting it straight up, the mechanical advantage of an inclined plane, the factor by which the force is reduced, is equal to the ratio of the length of the sloped surface to the height it spans. The angle of friction, also called the angle of repose, is the maximum angle at which a load can rest motionless on an inclined plane due to friction. This angle is equal to the arctangent of the coefficient of static friction μs between the surfaces, two other simple machines are often considered to be derived from the inclined plane. The wedge can be considered a moving inclined plane or two inclined planes connected at the base, the screw consists of a narrow inclined plane wrapped around a cylinder. The term may refer to a specific implementation, a straight ramp cut into a steep hillside for transporting goods up. It may include cars on rails or pulled up by a cable system, Inclined planes are widely used in the form of loading ramps to load and unload goods on trucks, ships, and planes. Wheelchair ramps are used to people in wheelchairs to get over vertical obstacles without exceeding their strength. Escalators and slanted conveyor belts are also forms of inclined plane, in a funicular or cable railway a railroad car is pulled up a steep inclined plane using cables. Inclined planes also allow heavy objects, including humans, to be safely lowered down a vertical distance by using the normal force of the plane to reduce the gravitational force. Aircraft evacuation slides allow people to rapidly and safely reach the ground from the height of a passenger airliner, other inclined planes are built into permanent structures. Similarly, pedestrian paths and sidewalks have gentle ramps to limit their slope, Inclined planes are also used as entertainment for people to slide down in a controlled way, in playground slides, water slides, ski slopes and skateboard parks. Inclined planes have been used by people since prehistoric times to move heavy objects, the Egyptian pyramids were constructed using inclined planes, Siege ramps enabled ancient armies to surmount fortress walls. The ancient Greeks constructed a paved ramp 6 km long, the Diolkos, however the inclined plane was the last of the six classic simple machines to be recognised as a machine. This is probably because it is a passive, motionless device, although they understood its use in lifting heavy objects, the ancient Greek philosophers who defined the other five simple machines did not include the inclined plane as a machine. This view persisted among a few scientists, as late as 1826 Karl von Langsdorf wrote that an inclined plane. is no more a machine than is the slope of a mountain. The problem of calculating the required to push a weight up an inclined plane was attempted by Greek philosophers Heron of Alexandria and Pappus of Alexandria
2.
Stairs
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A stairway, staircase, stairwell, flight of stairs, or simply stairs is a construction designed to bridge a large vertical distance by dividing it into smaller vertical distances, called steps. Stairs may be straight, round, or may consist of two or more straight pieces connected at angles, special types of stairs include escalators and ladders. Some alternatives to stairs are elevators, stairlifts and inclined moving walkways as well as stationary inclined sidewalks, a stair, or a stairstep is one step in a flight of stairs. In buildings, stairs is a term applied to a flight of steps between two floors. A stair flight is a run of stairs or steps between landings, a staircase or stairway is one or more flights of stairs leading from one floor to another, and includes landings, newel posts, handrails, balustrades and additional parts. A stairwell is a compartment extending vertically through a building in which stairs are placed. A stair hall is the stairs, landings, hallways, or other portions of the hall through which it is necessary to pass when going from the entrance floor to the other floors of a building. Box stairs are stairs built between walls, usually with no support except the wall strings, Stairs may be in a straight run, leading from one floor to another without a turn or change in direction. Stairs may change direction, commonly by two flights connected at a 90 degree angle landing. Stairs may also return onto themselves with 180 degree angle landings at each end of straight flights forming a vertical stairway commonly used in multistory, many variations of geometrical stairs may be formed of circular, elliptical and irregular constructions. Stairs may be a component of egress from structures and buildings. Stairs are also provided for convenience to access floors, roofs, levels, Stairs may also be a fanciful physical construct such as the stairs that go nowhere located at the Winchester Mystery House. Stairs are also a used in art to represent real or imaginary places built around impossible objects using geometric distortion. Stairway is also a metaphor for achievement or loss of a position in the society. Each step is composed of tread and riser, tread The part of the stairway that is stepped on. It is constructed to the specifications as any other flooring. The tread depth is measured from the edge of the step to the vertical riser between steps. The width is measured from one side to the other, riser The vertical portion between each tread on the stair
3.
Wheelchair
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A wheelchair, often abbreviated to just chair, is a chair with wheels, used when walking is difficult or impossible due to illness, injury, or disability. Wheelchairs come in a variety of formats to meet the specific needs of their users. They may include specialized seating adaptions, individualized controls, and may be specific to particular activities, as seen with sports wheelchairs and beach wheelchairs. The earliest records of wheeled furniture are an inscription found on a slate in China. The first records of wheeled seats being used for transporting disabled people date to three centuries later in China, the Chinese used early wheelbarrows to move people as well as heavy objects. A distinction between the two functions was not made for several hundred years, around 525 CE, when images of wheeled chairs made specifically to carry people begin to occur in Chinese art. Later records show the use of technology in Europe by the Renaissance. The invalid carriage or Bath chair brought the technology into more common use from around 1760, in 1887, wheelchairs were introduced to Atlantic City so invalid tourists could rent them to enjoy the Boardwalk. Soon, many healthy tourists also rented the decorated rolling chairs and servants to them as a show of decadence. In 1933 Harry Jennings and his disabled friend Herbert Everest, both engineers, invented the first lightweight, steel, collapsible wheelchair. Everest had previously broken his back in a mining accident, Everest and Jennings saw the business potential of the invention and went on to become the first mass-market manufacturers of wheelchairs. Their x-brace design is still in use, albeit with updated materials. There are a variety of types of wheelchair, differing by propulsion method, mechanisms of control. Some wheelchairs are designed for everyday use, others for single activities. The iBot is perhaps the best known example of this in recent years, a self-propelled manual wheelchair incorporates a frame, seat, one or two footplates and four wheels, usually two caster wheels at the front and two large wheels at the back. There will generally also be a seat cushion. As this causes friction and heat build-up, particularly on long downslopes, everyday manual wheelchairs come in two major varieties, folding or rigid. Folding chairs are generally low-end designs, whose predominant advantage is being able to fold, however this is largely an advantage for part-time users who may need to store the wheelchair more often than use it
4.
Baby transport
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Various methods of transporting children have been used in different cultures and times. These methods include prams, infant car seats, portable bassinets, strollers, slings, backpacks, baskets, the large, heavy prams, which had become popular during the Victorian era, were replaced by lighter designs during the latter half of the 1900s. William Kent developed an early stroller in 1733, in 1733, the Duke of Devonshire asked Kent to build a means of transport that would carry his children. Kent obliged by constructing a shell shaped basket on wheels that the children could sit in and this was richly decorated and meant to be pulled by a goat or small pony. These included adding a brake to carriages, a model which folded, designs for parasols, by 1840, the baby carriage became extremely popular. Queen Victoria bought three carriages from Hitchings Baby Store, the carriages of those days were built of wood or wicker and held together by expensive brass joints. These sometimes became heavily ornamented works of art, models were also named after royalty, Princess and Duchess being popular names, as well as Balmoral and Windsor. In June 1889, William H. Richardson patented his idea of the first reversible stroller, the bassinet was designed so it could face out or in towards the parent. He also made changes to the carriage. Until then the axis did not allow each wheel to move separately, Richardson’s design allowed this, as the 1920s began, prams were now available to all families and were becoming safer, with larger wheels, brakes, deeper prams, and lower, sturdier frames. In 1965, Owen Maclaren, an engineer, worked on complaints his daughter made about travelling from England to America with her heavy pram. Using his knowledge of aeroplanes, Maclaren designed a stroller with an aluminium frame and he then went on to found Maclaren, which manufactured and sold his new design. The design took off and soon “strollers” were easier to transport, in the 1970s, however, the trend was more towards a more basic version, not fully sprung, and with a detachable body known as a carrycot. Now, prams are very used, being large and expensive when compared with buggies. One of the longer lived and better known brands in the UK is Silver Cross, first manufactured in Hunslet, Leeds, in 1877 and they continue to sell the traditional Silver Cross coach prams which are manufactured at a factory in Bingley in Yorkshire. Since the 1980s, the industry has developed with new features, safer construction. Larger and heavier prams, or perambulators had been used since their introduction in the Victorian era, prams were also used for infants, the term carrycot became more common in the UK after the introduction of lighter units with detachable baby carriers in the 1970s. As they developed through the suspension was added, making the ride smoother for both the baby and the person pushing it
5.
Cart
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A cart is a vehicle designed for transport, using two wheels and normally pulled by one or a pair of draught animals. A handcart is pulled or pushed by one or more people and it is different from a dray or wagon, which is a heavy transport vehicle with four wheels and typically two or more horses, or a carriage, which is used exclusively for transporting humans. Over time, the cart has come to mean nearly any small conveyance, from shopping carts to golf carts, without regard to number of wheels, load carried. The draught animals used for carts may be horses or ponies, mules, oxen, water buffalo or donkeys, carts have been mentioned in literature as far back as the second millennium B. C. The Indian sacred book Rigveda states that men and women are as equal as two wheels of a cart, hand-carts pushed by humans have been used around the world. In the 19th century, for instance, some Mormons travelling across the plains of the United States between 1856 and 1860 used handcarts, the history of the cart is closely tied to the history of the wheel. Larger carts may be drawn by animals, such as horses, mules and they have been in continuous use since the invention of the wheel, in the 4th millennium BC. Carts may be named for the animal that pulls them, such as horsecart or oxcart, in modern times, horsecarts are used in competition while draft horse showing. A dogcart, however, is usually a cart designed to carry hunting dogs, the term cart is also used for various kinds of lightweight, two-wheeled carriages, some of them sprung carts, especially those used as open pleasure or sporting vehicles. They could be drawn by a horse, pony or dog, the name survives today as a milkfloat. The seat is adjustable fore-and-aft to keep the vehicle balanced for two or four people, carts have many different shapes, but the basic idea of transporting material remains. Carts may have a pair of shafts, one each side of the draught animal that supports the forward-balanced load in the cart. The shafts are supported by a saddle on the horse, alternatively, the cart may have a single pole between a pair of animals. The draught traces attach to the axle of the vehicle or to the shafts, the traces are attached to a collar, to a yoke or to a harness on dogs or other light animals. Traces are made from a range of materials depending on the load, heavy draught traces are made from iron or steel chain. Lighter traces are often leather and sometimes rope, but plaited horse-hair. The dray is often associated with the transport of barrels, particularly of beer, of the cart types not animal-drawn, perhaps the most common example today is the shopping cart, which has also come to have a metaphorical meaning in relation to online purchases. Shopping carts first made their appearance in Oklahoma City in 1937, in golf, both manual push or pull and electric golf trolleys are designed to carry a golfers bag, clubs and other equipment
6.
Elevator
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An elevator or lift is a type of vertical transportation that moves people or goods between floors of a building, vessel, or other structure. Elevators are generally powered by electric motors that either drive traction cables or counterweight systems like a hoist, in agriculture and manufacturing, an elevator is any type of conveyor device used to lift materials in a continuous stream into bins or silos. Several types exist, such as the chain and bucket elevator, grain auger screw conveyor using the principle of Archimedes screw, or the chain, languages other than English may have loanwords based on either elevator or lift. Because of wheelchair access laws, elevators are often a requirement in new multistory buildings. The earliest known reference to an elevator is in the works of the Roman architect Vitruvius, some sources from later historical periods mention elevators as cabs on a hemp rope powered by hand or by animals. In 1000, the Book of Secrets by al-Muradi in Islamic Spain described the use of a lifting device. In the 17th century the prototypes of elevators were located in the buildings of England. Louis XV of France had a flying chair built for one of his mistresses at the Chateau de Versailles in 1743. Ancient and medieval elevators used drive systems based on hoists or winders, the invention of a system based on the screw drive was perhaps the most important step in elevator technology since ancient times, leading to the creation of modern passenger elevators. The first screw drive elevator was built by Ivan Kulibin and installed in Winter Palace in 1793, several years later another of Kulibins elevators was installed in Arkhangelskoye near Moscow. The development of elevators was led by the need for movement of raw materials including coal, the technology developed by these industries and the introduction of steel beam construction worked together to provide the passenger and freight elevators in use today. Starting in the mines, by the mid-19th century elevators were operated with steam power and were used for moving goods in bulk in mines and factories. It elevated paying customers to a height in the center of London. Early, crude steam-driven elevators were refined in the decade, – in 1835 an innovative elevator called the Teagle was developed by the company Frost. The elevator was belt-driven and used a counterweight for extra power, the hydraulic crane was invented by Sir William Armstrong in 1846, primarily for use at the Tyneside docks for loading cargo. These quickly supplanted the steam driven elevators, exploiting Pascals law. A water pump supplied a variable level of pressure to a plunger encased inside a vertical cylinder. Counterweights and balances were used to increase the lifting power of the apparatus
7.
Wheelchair lift
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Wheelchair lifts can be installed in homes or businesses and are often added to both private and public vehicles in order to meet accessibility requirements laid out by disability acts. These mobility devices are installed in homes as an alternative to a stair lift. In some instances, accessibility standards have been achieved in legal settlements, for example, in the 2005 case of Dilworth, et al. v. City of Detroit, NO. While some wheelchair-accessible vans use a lift to assist the occupant in boarding. Full-size vans, however, require use of a platform lift, there are two types of platform lifts installed on wheelchair-accessible vans, single-arm and dual-arm. Single-arm wheelchair lifts are used in side-entry applications. They take up less space and leave the passenger entry open, however. Most dual-arm wheelchair lifts have a capacity up to 800 pounds. These lifts consume more interior space and block the entry and. As mandated by the National Highway Traffic Safety Administration, wheelchair-accessible vans with wheelchair lifts are equipped with a safety lift interlock, recent innovations have allowed for the development of wheelchair lifts which assist people in entering truck cabs, so that they may drive or operate heavy equipment. Wheelchair lifts can also be used to move an unoccupied scooter into a vehicle, an indoor vertical platform lift operates much like an elevator which is installed within a hoist-way or shaft-way. Although the installation of a platform lift is similar to that of an elevator its much less expensive. Some models, such as the Savaria V-1504 hydraulic lift, offer options to finish a vertical lift to make it operate more like a home elevator. An outdoor vertical platform may include factory-built enclosures that protect the user from the weather, the enclosure acts as a shaft-way inside the unit with gates or doors that are added to the entrance or exit. Health Equipment For Farmers Who Use Wheelchairs, Doreen Greenstein and Naomi Miner, Cornell University Cooperative Extension, americans with Disabilities Act Safaria wheelchair lifts
8.
Building code
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A building code is a set of rules that specify the standards for constructed objects such as buildings and nonbuilding structures. Buildings must conform to the code to obtain planning permission, usually from a local council, the main purpose of building codes is to protect public health, safety and general welfare as they relate to the construction and occupancy of buildings and structures. The building code becomes law of a jurisdiction when formally enacted by the appropriate governmental or private authority. Codes regulating the design and construction of structures where adopted into law, examples of building codes began in ancient times. In the USA the main codes are the International Commercial or Residential Code, electrical codes and plumbing, fifty states and the District of Columbia have adopted the I-Codes at the state or jurisdictional level. In Canada, national model codes are published by the National Research Council of Canada, the practice of developing, approving, and enforcing building codes varies considerably among nations. In some countries building codes are developed by the government agencies or quasi-governmental standards organizations, such codes are known as the national building codes. In other countries, where the power of regulating construction and fire safety is vested in local authorities, model building codes have no legal status unless adopted or adapted by an authority having jurisdiction. The developers of model codes urge public authorities to reference model codes in their laws, ordinances, regulations, when referenced in any of these legal instruments, a particular model code becomes law. This practice is known as adoption by reference, there are instances when some local jurisdictions choose to develop their own building codes. At some point in all major cities in the United States had their own building codes. However, due to increasing complexity and cost of developing building regulations. For example, in 2008 New York City abandoned its proprietary 1968 New York City Building Code in favor of a version of the International Building Code. The City of Chicago remains the only municipality in America that continues to use a building code the city developed on its own as part of the Municipal Code of Chicago, in Europe, the Eurocode is a pan-European building code that has superseded the older national building codes. Each country now has National Annexes to localize the contents of the Eurocode, similarly, in India, each municipality and urban development authority has its own building code, which is mandatory for all construction within their jurisdiction. All these local building codes are variants of a National Building Code, Building codes have a long history. The earliest known written building code is included in the Code of Hammurabi, the book of Deuteronomy in the Hebrew Bible stipulated that parapets must be constructed on all houses to prevent people from falling off. The Laws of the Indies were passed in the 1680s by the Spanish Crown to regulate the urban planning for colonies throughout Spains worldwide imperial possessions, the first systematic national building standard was established with the London Building Act of 1844
9.
United Nations
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The United Nations is an intergovernmental organization to promote international co-operation. A replacement for the ineffective League of Nations, the organization was established on 24 October 1945 after World War II in order to prevent another such conflict, at its founding, the UN had 51 member states, there are now 193. The headquarters of the UN is in Manhattan, New York City, further main offices are situated in Geneva, Nairobi, and Vienna. The organization is financed by assessed and voluntary contributions from its member states, the UNs mission to preserve world peace was complicated in its early decades by the Cold War between the US and Soviet Union and their respective allies. The organization participated in actions in Korea and the Congo. After the end of the Cold War, the UN took on major military, the UN has six principal organs, the General Assembly, the Security Council, the Economic and Social Council, the Secretariat, the International Court of Justice, and the UN Trusteeship Council. UN System agencies include the World Bank Group, the World Health Organization, the World Food Programme, UNESCO, the UNs most prominent officer is the Secretary-General, an office held by Portuguese António Guterres since 2017. Non-governmental organizations may be granted consultative status with ECOSOC and other agencies to participate in the UNs work, the organization won the Nobel Peace Prize in 2001, and a number of its officers and agencies have also been awarded the prize. Other evaluations of the UNs effectiveness have been mixed, some commentators believe the organization to be an important force for peace and human development, while others have called the organization ineffective, corrupt, or biased. Following the catastrophic loss of life in the First World War, the earliest concrete plan for a new world organization began under the aegis of the US State Department in 1939. It incorporated Soviet suggestions, but left no role for France, four Policemen was coined to refer to four major Allied countries, United States, United Kingdom, Soviet Union, and China, which emerged in the Declaration by United Nations. Roosevelt first coined the term United Nations to describe the Allied countries, the term United Nations was first officially used when 26 governments signed this Declaration. One major change from the Atlantic Charter was the addition of a provision for religious freedom, by 1 March 1945,21 additional states had signed. Each Government pledges itself to cooperate with the Governments signatory hereto, the foregoing declaration may be adhered to by other nations which are, or which may be, rendering material assistance and contributions in the struggle for victory over Hitlerism. During the war, the United Nations became the term for the Allies. To join, countries had to sign the Declaration and declare war on the Axis, at the later meetings, Lord Halifax deputized for Mr. Eden, Wellington Koo for T. V. Soong, and Mr Gromyko for Mr. Molotov. The first meetings of the General Assembly, with 51 nations represented, the General Assembly selected New York City as the site for the headquarters of the UN, and the facility was completed in 1952. Its site—like UN headquarters buildings in Geneva, Vienna, and Nairobi—is designated as international territory, the Norwegian Foreign Minister, Trygve Lie, was elected as the first UN Secretary-General
