An
elevator or lift is a vertical transport vehicle that efficiently moves
people or goods between floors of a building. They are generally
powered by electric motors that either drive traction cables and counterweight systems, or pump hydraulic fluid to raise a cylindrical piston.
Elevator doors protect building tenants from falling into the shaft. The most common configuration is to have two panels that meet in the middle, and slide open laterally. In a cascading
configuration (potentially allowing wider entryways within limited
space), the doors run on independent tracks so that while open, they are
tucked behind one another, and while closed, they form cascading layers on one side... |
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