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.


The ThyssenKrupp Elevator “single-post” holeless jack is a unique design.The AMEE C series has special front-mounted cylinders that extend through the front wall of the cab, which necessitates slightly more hoistway depth. The jack can be single stage (single plunger) or telescopic, i.e. multiple stages. A telescopic two stage jack has a pair of two-stage plungers. This application accommodates only front opening entrance configurations. One jack is used; it runs through the front wall of the cab. This design takes advantage of using a conventional jack in a unique way. Instead of the jack being installed in the ground it is installed above ground in the hoistway. Running the jack through the front wall allows a cross head pick up so the hoistway space is more efficiently used. alternative is also available: the multi-stage telescopic jack.
When a single stage jack will not work for a hydraulic equipment type, a telescopic jack may be a viable solution. This is a jack in which multiple pistons telescope together. For instance, a two-stage jack, when fully compressed together, is approximately one-half the length of a single stage jack, even though it serves the same travel.

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