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.


There are some important points to know about the jacks in a twin-post jack holeless application.
1. "Twin-post jack" means there are two jacks, one on each side of the elevator car.
2. The jacks can be single stage jacks (having a single plunger) or telescopic jacks (having two or more stages of plunger).
o A telescopic two stage jack has a pair of two-stage plungers.
o A telescopic three stage jack has a pair of three-stage plunger.

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