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.

Door Interlock

Prevents the operation on the machine unless the hoistway door is locked in a closed position, Also prevents the opening of hoistway doors from the landing side unless the elevator is in the landing zone and is either stopped or coming to a stop.

Tags:  Entrance Doors


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