Flashcards in VERTICAL TRANSPORTATION Deck (17):
How fast do hydraulic elevators go?
25 fpm - 150 fpm
Another term for electric elevators
What is the difference between gearless traction elevators and geared traction elevators?
Gearless use a direct current motor, are dependable, and high-speed (250 fpm - 1800 fpm)
Geared traction elevators are for slower speeds (25 fpm - 450 fpm)
What are two ways to rope an elevator?
Single-wrap: a rope passes over the sheave only once, and then connects to the counterweight.
Double-wrap: (for high speeds) additional traction from the rope wound over the sheave twice
Basic ADA requirements for elevators
Door opening 36 inches clear
Side approach controls less than 54 inches in height, front approach control less than 48 inches in height
Recommended interval (average waiting time) for an elevator
30 to 35 seconds for offices, and 40 to 70 seconds for hotels and apartments
They shouldn't be more than ? elevators in a group, and ? in a line
8 and 4
What are some ways to make elevators more efficient and very tall building?
1. Have elevators serve upper floors separately (2-20, 21-40, etc)
2. Sky lobby
3. Double deck elevator cabs
Roughly how big is the machine room?
The same with + 12 to 16 feet deeper
Name and describe all the freight elevator classes
Class A: General freight, no item can exceed a fourth of the rated capacity of the elevator
Class B: motor vehicle loading
Class C1: industrial truck loading, including the truck
Class C2: industrial truck loading, not including the truck
Class C3: also not carrying the truck
How much weight can freight elevators generally carry? How fast are they?
Usually 2500 pounds to 8000 pounds, with some lifting up to 100,000 pounds... 50 fpm - 800 fpm
Three sizes of escalators and their actual trade widths
32, 40, and 48… But actual tread width of 24, 32, 40
32 and 48 are the most common since 40 doesn't actually give you two rows of people
Capacity of escalators
2300 for the 32 inch, and 4500 for the 48 inch
What are Winders?
Angled treads turning a corner
Minimum stair width
36 inches, or 44 inches when the occupant load is greater than 50
Winders have to be a minimum of how many inches of their narrowest point?