Escalator

An escalator is a motorized moving staircase designed to transport people between different floors of a building or structure.

These machines are vital for moving large numbers of people efficiently through high-traffic environments. You will often find them in department stores, shopping malls, and airports. They are also essential in transit systems like railway stations, as well as in hotels, arenas, and stadiums. Unlike elevators, escalators generally have no waiting interval between trips, which helps maintain a steady flow of foot traffic. A unique advantage is that if an escalator loses power, it can still function as a normal, stationary staircase.

The mechanical operation of an escalator relies on a continuous cycle of linked parts. It consists of a motor-driven chain made of individually linked steps. These steps travel along a pair of tracks that are specifically designed to keep the step tread horizontal. This ensures that the surface remains level while it moves, allowing passengers to stand safely. The steps cycle through the system, moving up or down the incline. This process allows for a constant stream of movement without the need for passengers to wait for a vehicle to arrive.

Throughout history, several inventors contributed to the development of this technology. In 1859, Nathan Ames of Saugus, Massachusetts, patented a design called "revolving stairs."

While his patent described using manual or hydraulic power, no working model was ever built. In 1889, Leamon Souder patented a "stairway" featuring linked steps, but this also remained a design only. Jesse W. Reno later produced the first operable escalator installation in 1896. He called his device an "inclined elevator" and installed it at Coney Island in New York City. This machine was an inclined belt with cast-iron slats used for traction.

The modern commercial escalator emerged through the work of Charles Seeberger and the Otis Elevator Company. Around 1895, Seeberger began designing a device similar to George A. Wheeler's earlier patents. Unlike Reno's earlier models, Seeberger's design featured flat, moving stairs. However, these early versions lacked a comb effect to safely guide feet off at the ends. Passengers had to step off sideways, as the steps continued moving horizontally beyond the handrail. In 1899, Seeberger teamed with Otis to produce the first commercial escalator. This model won first prize at the 1900 Paris Exposition Universelle.

The name "escalator" has a specific history tied to Charles Seeberger. He trademarked the term in 1900 to coincide with his device's debut. To create the name, Seeberger consulted a Latin lexicon. He used "Scala" as a root, adding "E" as a prefix and "Tor" as a suffix. His rough translation of the new word was "means of traversing from." While some believe the word is a mix of French or Greek, Seeberger's own documents show his Latin-based intent. For many years, the Otis Elevator Company held the exclusive trademark for the word. This forced other manufacturers to use different names, such as "Motorstair" or "Electric Stairway."

Today, the industry is dominated by several major global manufacturers. While Otis was a pioneer, companies like Kone and Schindler have become leaders in the field. Kone grew through international acquisitions in the 1970s, eventually taking control of Westinghouse's European business. Schindler became the largest maker of escalators in the world, though they did not install their first unit until 1936. In the modern market, Mitsubishi and ThyssenKrupp serve as primary rivals to Otis. These companies manage the complex systems required for massive transit hubs and skyscrapers.

Some historic escalator models still exist and provide a glimpse into the past. For example, Macy's Herald Square in New York City operates several historic units. Some of these Otis "L-type" escalators have featured distinctive wooden treads since 1927.

In Europe, some very old escalators remain in service within tunnels. The St Anna Pedestrian Tunnel in Belgium and the Maastunnel in the Netherlands are notable examples. Some of these older models, manufactured by Waygood Otis, were once believed to be the longest single-lift escalators in the world. They were even designed to accommodate cyclists in certain tunnel systems.