How does an Elevator work?

Elevators enabled modern urban development and tall skyscrapers. While lifting devices existed in antiquity, it was Elisha Otis in the 1850s who invented the critical safety brake mechanism—using a leaf spring and pivot arms—that allowed elevators to safely transport people.

There are two primary elevator systems: hydraulic elevators, which use a piston and oil pressure for low-rise buildings, and traction elevators, which use electric motors, cables, and counterweights to serve tall skyscrapers efficiently.

Traction elevators operate using a motor, a sheave pulley, and a counterweight that balances the cab to reduce strain on the motor. Advanced versions, known as Machine Room-Less (MRL) elevators, house all components directly within the elevator shaft.

Elevators feature robust safety redundancy, including multiple high-strength cables and an overspeed governor. If the cab descends too quickly, the governor activates emergency clamps that grip the guide rails, halting the elevator immediately.

Elevators utilize a two-part door system consisting of hoistway doors and cab doors. A clutch mechanism on the cab interacts with pickup rollers on the floor doors, ensuring that doors only open when the cab is safely aligned and stopped at a floor.