How The Elevator Works - PowerPoint PPT Presentation

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How The Elevator Works

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  1. How The Elevator Works By Joseph Mackay Plaxco The University of the South Sewanee, TN 37383

  2. Why? • I find the elevator “cool.” • Phobia when younger • Gets people to destinations fast. • Large cities wouldn’t be the same.

  3. Different Types • Freight Elevators • Stage Elevators

  4. The Basic Design • The basic design is a compartment that is somehow lifted • Two Types of Elevators: • Hydraulic • Rope-Geared

  5. The Hydraulic Elevator • The car is moved up and down using “a fluid piston mounted inside a cylinder” (Harris). • Consists of three parts: • Tank • Pump • Valve

  6. Hydraulic ElevatorsA Closer Look • The car is placed on a piston. • Fluid Pumping System • A tank (off to the side) holds the fluid. • When the valve closes, the car is lifted. • When the valve opens, the car is lowered.

  7. Diagram of Hydraulic Elevator • The following link is from the website “How Stuff Works” written by Tom Harris. • How Elevators Work - Hydraulic

  8. Hydraulic Disadvantages • Two Disadvantages • Must Have Enough Room • Energy Inefficient

  9. Rope-Geared Elevators • These are the most popular types of elevators. • Rather than being pushed from below, these types of elevators are moved using cables

  10. Rope-Geared Design • Cables attach to the car and through a sheave. • The sheave is connected to an electric motor. • Motor turns one way, elevator moves up. Motor turns the other way, elevator moves down. • The ropes are connected to a counterweight. • The counterweight system serves as a means for conserving energy.

  11. Rope-Geared Design (Cont’d) • Rails are used to guide the elevator • Keep elevator and counterweights steady. • Rope-geared elevators are much more efficient and safer.

  12. Diagram of Rope-GearedElevator • The following link came from the “How Stuff Works” webpage written by Tom Harris • Rope-Geared Elevator Diagram

  13. Safety Systems • More ropes than needed • Built-in brake systems • Governor prevents the elevator from falling to the bottom of the shaft. Centrifugal force causes a brake system to activate. • Also has an electromagnetic brake that is activated if the elevator loses power. • Automated Brake System at the top and bottom of the shaft.

  14. Moving To Destinations • Modern elevators use computers. • Slows down • Only answer “up calls” as going up and the same for going down. • Modern “Smart” systems take into account the busiest parts of the day. • Press the floor you want in the lobby. • Load Sensor

  15. Works Cited • Harris, Tom. “How Elevators Work”. www.howstuffworks.com/elevator 2002.