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Flashcards in VERTICAL TRANSPORTATION Deck (17):
1

How fast do hydraulic elevators go?

25 fpm - 150 fpm

2

Another term for electric elevators

Traction elevators

3

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)

4

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

5

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

6

Recommended interval (average waiting time) for an elevator

30 to 35 seconds for offices, and 40 to 70 seconds for hotels and apartments

7

They shouldn't be more than ? elevators in a group, and ? in a line

8 and 4

8

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

9

Roughly how big is the machine room?

The same with + 12 to 16 feet deeper

10

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

11

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

12

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

13

Capacity of escalators

2300 for the 32 inch, and 4500 for the 48 inch

14

What are Winders?

Angled treads turning a corner

15

Minimum stair width

36 inches, or 44 inches when the occupant load is greater than 50

16

Winders have to be a minimum of how many inches of their narrowest point?

6 inches

17

What lifts a hydraulic elevator?

Plunger, also called a ram