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.

Extended Heads

Extensions of the escalator truss proper at either the lower or upper head to reach the building supporting steel when it is located beyond the standard dimensional requirements of the escalator. These extensions may occur at either upper or lower head or at both ends of the unit.

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