Classroom on demand

Welcome to Classroom on demand, your source for educational materials related to the vertical transportation industry. This site represents the knowledge and expertise of the best engineers and mechanics in the elevator industry, and will help those new to the elevator industry learn about the basic workings of elevator systems, and also will serve as a reference for people with more experience.

Safeties

Safeties
The purpose of the safeties is to stop and hold the car if the speed is too fast, the ropes have slack in them, or the car is in a free-fall. The safeties are attached to the safety planks under the car.
There are three types of safeties: Type A, B, and C.
Type A
Brings car to an immediate stop. Can only be used on speeds under 151 fpm (0.77 m/s). Type A safeties are the least expensive.
Type B
Brings car to a gradual stop. Can be used on any speed.
Type C
Brings car to a gradual stop. Can only be used on speeds under 501 fpm (2.55 m/s). This is an older design that is rarely used.
Note: If the space below the hoistway is occupied, safeties are also required on the counterweight.

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