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.

Linear (LD) Door Operator

Evolving motor technology has helped develop a different mechanical design called a linear door operator. Linear operator motors engage the doors more directly through gears and a clogged belt.

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