Ferris Wheel



Background

A ferris wheel is an amusement park ride consisting of a large vertical wheel with places for people to sit or stand spaced evenly around the outer circumference. In operation, the ferris wheel revolves about a horizontal axis, and the riders are alternately lifted and then lowered as they are carried around the wheel in a circle. When the wheel stops, the people in the seat or platform at ground level exit the ride, and new riders take their place. The wheel then revolves a short distance until the next seat or platform is at ground level, allowing more people to exit and enter. This procedure is repeated until all the seats or platforms are filled with new riders, at which time the wheel is set in motion to undergo several complete revolutions. Although the name "ferris wheel" was not used until the 1890s, the wheel itself has been a part of human festivities for hundreds of years.

History

The earliest designs of wheels used for amusement rides may have been based on the large, circular wheels used to lift water for irrigation. In fact, knowing the human spirit, it is probable that adventuresome children used these water wheels for entertainment from the time they were first developed in about 200 B.C.

English traveler Peter Mundy described what he called a "pleasure wheel" with swings for seats after he visited a street fair in Turkey in 1620. In England, small handturned wheels were called "ups-and-downs" as early as 1728.

Whatever they were called, amusement wheels found their way to many parts of the world. One of the first wheels in the United States was built in 1848 by Antonio Maguino, who used it to draw crowds to his rural park and picnic grounds in Walton Spring, Georgia. As the concept of mixing amusement rides with park and picnic facilities caught on, several companies began manufacturing wheels of various designs. In 1870, Charles W.P. Dare of Brooklyn made several wood wheels of 20-and 30-ft (6.1-and 9.1-m) diameters, which he sold as the Dare Aerial Swing. The Conderman Brothers of Indiana made an even larger wheel when they developed a 35-ft (10.7-m) metal wheel in the 1880s.

The race for larger wheels culminated in early 1893 when American bridge builder and engineer, George Washington Gale Ferris, began building a 250-ft (76.2-m) wheel for the 1893 Colombian Exposition in Chicago. Designed like a bicycle wheel, with a stiff steel outer rim hung from the center axle by steel spokes under tension, the wheel could carry as many as 1,440 passengers at a time in 36 enclosed cars. The center axle was 33 in (84 cm) in diameter and 45.5 f (13.9 m) in length. It weighed 46.5 tons (42.2 metric tons) and was the largest steel forging ever produced at the time. The giant wheel opened on June 21, 1893, and drew more than 1.4 million paying customers during the 19 weeks it was in operation. The overwhelming success of Ferris' design ensured that his name would be forever linked with such wheels.

One of the people who rode the ferris wheel at the Colombian Exposition was American inventor and bridge builder William E. Sullivan. Sullivan was fascinated with the wheel and rode it many times. What was especially attractive to him was the possibility of making a smaller wheel that could be taken down and moved from one park or fairground to another. Drawing on his experience with bridges, he designed a 45-ft (13.7-m) transportable wheel with twelve three-passenger seats in 1900. In 1906 he formed the Eli Bridge Company and started manufacturing his wheel in Roodhouse, Illinois. Later he moved the company to Jacksonville, Illinois, where it remains in operation today. Most of the ferris wheels found in carnivals and fairs in the United States are made by the Eli Bridge Company.

Raw Materials

Because of the unique design of a ferris wheel, most of the component parts are fabricated by the manufacturer. Steel is the most common raw material and is used to make the trailer chassis, wheel support towers, wheel spokes, and wheel crossmembers. A variety of structural steel shapes are used depending on the application. They include square tubing, round tubing, angles, channels, and wide-flanged beams. Aluminum diamond tread plate is used for the entrance and exit walk-ways and for the operator's platform.

Aluminum is used to make the seats and the drive rims. The drive rims are rolled out of aluminum angle stock and are attached to the spokes to form a large circle about 10 ft (3 m) smaller in diameter than the outer rim of the wheel itself. Two rubber drive wheels press against the drive rims on each side to rotate the wheel. Aluminum is used in this application because the constant rubbing of the drive wheels quickly removes the paint on the rims, exposing the bare metal. If steel were used, it would rust.

The cushions used on the seats are molded from a self-skinning polyurethane foam. This material forms a solid, smooth skin on the outside, while the inside remains a compressible foam. Nylon is used for some of the bushings, and a phenolic plastic is used in some of the electrical components. Support cables within the wheel structure may have a plastic cover for appearance and protection from the elements. The electrical rings that carry electrical power from the hubs to the lights along the rotating spokes are made of copper, and the brushes that bring the power to the rings are made of carbon.

Some ferris wheel components are purchased from other manufacturers and are installed on the ferris wheel when it is built. These include the axles, brakes, tires, and wheels on the trailer. Other purchased components include the electric drive motors, the electrical wires and cables, and the electrical light bulbs and sockets.

Design

Ferris wheels that are designed to be transported on the road from one location to another must conform to the overall width, height, and length restrictions for highway vehicles. Although these restrictions vary from state to state, most states limit the trailer width to 8.5 ft (2.6 m), the height to 13.5 ft (4.1 m), and the length to 55 ft (16.8 m). No matter how big or small the ferris wheel is when it is opened and in operation, it must fold down to meet these restrictions when it is travelling on the highway.

The ferris wheel must also be designed to operate safely. This requires calculations to ensure the horizontal and vertical forces of the fully loaded wheel can be supported when the wheel is in operation. It also requires the design of safety interlocks to prevent the wheel from revolving during loading and unloading operations, and to prevent the operator from inadvertently operating the wheel in an unsafe manner.

The Manufacturing Process

The manufacturing processes used to make ferris wheels varies with the design of the wheel and the manufacturer. Most of the components are built in different parts of the shop before they are brought to the main construction area for final assembly. Here is a typical sequence of operations used to build a transportable ferris wheel used in carnivals and county fairs. In operation, the wheel described is about 60 ft (18.3 m) in diameter with a capacity to carry up to 48 riders in 16 seats.

Building the chassis

Installing the towers

Installing the spokes

Finishing the wheel

Safety Considerations

As with any amusement park ride, safety is the primary concern of both the manufacturer and the operator. Current safety regulations governing ferris wheels vary from city to city and state to state. The American Society for Testing and Materials (ASTM) is in the process of developing a comprehensive standard for the design, testing, manufacturing, and operation of all amusement park rides. Ferris wheel manufacturers and amusement park operators are actively participating in this process.

The Future

Having provided entertainment for several hundred years, if not several thousand years, the ferris wheel will probably continue to be a pleasurable experience for many years to come. Although roller coasters and other thrill rides may dominate amusement parks, the ferris wheel will still give riders the gentle thrill of being carried up in the air in an open seat to hang high above the crowds on a warm summer evening.

Where to Learn More

Books

Anderson, Norman D., and Walter R. Brown. Ferris Wheels. New York: Pantheon Books, 1983.

Periodicals

Marks, D., and J. Barfield. "Riding High." People Weekly (November 15, 1999): 62-63.

Other

Eli Bridge Company. http://www.elibridge.com (October 13, 2000).

Chris Cavette



Also read article about Ferris Wheel from Wikipedia

User Contributions:

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ibrahim
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Dec 26, 2011 @ 2:02 am
what is solution of ferries wheel and design???i need the solution please

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