While youre zoning out in an elevator, waiting to reach your floor, do you ever wonder who came up with the idea? Probably not. We just expect to have safe, working elevators in multistory buildings and we get pretty irritated when we have to take the stairs instead. While there is one person typically credited with the invention, its naturally more complicated than that.

Elevators existed as far back as ancient Rome; Archimedes was building them in 336 B.C., and gladiators and animals rode lifts to the Roman Coliseum arena by A.D. 80. Of course, those early "elevators" werent enclosed cars. They were simple platforms and hoists, typically used to perform tasks such as raising up water for irrigation or lifting heavy building materials such as stones. These lifts were powered by animals, people or even water wheels.

What were really talking about is the modern passenger elevator. The first one was built for King Louis XV in 1743 and was called "The Flying Chair." Installed on the outside of the kings palace at Versailles, his elevator went from the first to the second floor (linking the kings apartment to that of his mistress).The king entered it from his balcony, and then men stationed inside a chimney raised and lowered the elevator through the use of ropes and pulleys.

Elevators became more common in the mid-1800s during the Industrial Revolution when they transported freight in factories and mines. These elevators were often based on the hydraulic system. A piston inside a cylinder used pressure from water or oil to raise and lower the car. The drawback was that buildings with hydraulic elevators needed to have pits below the elevator shaft so that the piston could draw completely back. The higher the building was, the deeper the pit had to be. This design was impractical for very tall buildings, although it became popular in mansions because it could operate off the public water system.

Another elevator design (and the one found most often today in passenger elevators) uses a cable system, in which ropes raise and lower the car by means of a pulley and gear system. A counterweight, raised and lowered at the same time as the car, works like a seesaw and helps to conserve energy. These types of elevators are easier to control, and buildings that have them dont need the extra room required by hydraulic systems.

By the 1850s, these types of elevators were powered by water pressure or steam, but they still werent very common. Read on to find out why and how the person who solved the problem may or may not be considered the inventor of the elevator.

HIT THE BRAKES, BABY.

The possibility of a plummeting elevator makes for an exciting action sequence in the movies, but, in reality, modern elevators are very safe. Not only do they have multiple steel cables, each capable of supporting the elevators weight, but there are also several different braking systems. Safeties brakes on either side of the car engage when the car moves too fast. Electromagnetic brakes switch on when the car stops and if the elevator loses power. Other brakes located at the top and bottom of the elevator shaft come into play if the car gets too close to either end. If all of these different systems fail, theres a shock-absorbing system at the bottom of the shaft to cushion your fall. Most elevator-related accidents having nothing to do with the car falling; usually, they involve people doing things like walking into open elevator shafts (due to an elevator malfunction) or getting hit by or stuck in elevator doors.

At the time, elevators that operated on a cable system were considered unreliable and dangerous, because, if the ropes broke, the elevator plummeted to the bottom. Freight could be damaged, but, more importantly, passengers were often killed by the fall. The person who found a solution to this problem revolutionized the concept of the elevator. But was it Elisha Otis, or Otis Tufts?

While working in a factory in 1852, Elisha Otis and his sons came up with an elevator design that employed a safety device. A wooden frame at the top of the platform would snap out against the sides of the elevator shaft if the ropes broke, essentially functioning as a brake. Otis called it the "safety hoist" and dramatically demonstrated this design at the 1854 New York Worlds Fair. He rode the platform high into the air and then had the rope cut, but, thanks to the brake, it only fell a few inches before stopping. Otis founded an elevator company, Otis Brothers, which installed the first public elevator in a five-story New York department store in 1874. Electric elevators came about in the 1880s.

This means that Elisha Otis is the inventor of the modern passenger elevator, right? It depends on who you ask. Until the Worlds Fair demonstration, Otis hadnt had much luck selling elevators, and his initial elevator patent in 1861 was for a freight elevator the open platform kind not an enclosed passenger one. For this reason, some think of another Otis, Otis Tufts, as the actual inventor of the modern passenger elevator. Two years before Elisha Otis, Tufts patented an elevator design that had benches inside an enclosed car, with doors that opened and closed automatically.

Theres a key reason why Elisha Otis gets the credit and not Tufts. Tufts design did away with the typical rope and pulley system due to safety concerns. Instead, he used the concept of a nut threading up and down a screw. The elevator car was the nut, threaded onto a giant steel screw that extended the entire length of the shaft. While it was very safe, it was also expensive and impractical especially for very tall buildings. Tufts did sell a few of his elevators, but his design wasnt widely adopted.

The Otis Brothers Company (today known as the Otis Elevator Company) continued to make improvements in elevator safety and efficiency. Today, its the worlds largest manufacturer of elevators and escalators, while Tufts is known more for his inventions of the steam-powered printing press and the steam-powered pile driver.