elevator machine

Platforms {elevator, lift}| can raise and lower. Elevator cars ride in vertical guide rails.

hydraulic

Hydraulic elevators have small cages or closets at piston top, resting in cylinders filled with oil. Pump applies pressure to fluid to raise elevator and reduces pressure to lower elevator. Hydraulic elevators have speed of one floor per second.

electric

Electric elevators [1887] use an electric induction motor at top to pull cables through a pulley {sheave}. Elevator car hangs on one pulley side, and a large counterweight hangs from other side. Elevators have a brake. Switches just before floors tell electric motor to slow. Switches at floors tell motor to stop. Electric elevators allowed skyscrapers.

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7-Machine-Kinds-Electromechanical

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Technical Information

Date Modified: 2022.0224