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Flashcards in 4 Building Systems Deck (107)
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31

Drum elevator

Cable is pulled onto a large drum above the elevator shaft, counterweights reduce effort in wasting and lowering car, similar to a winch

32

traction elevator

Cable from elevator goes straight up and over drive sheave. Traction is produced by counterweight hanging on opposite side of cable. Requires braking system

33

Traction motor braking system

Drum break located on the shaft of the drive motor

34

Safety mechanisms for elevators

Terminal device, buffers, speed reducing switch, overspeed switch, car safeties

35

Terminal device

Electric switch designed to stop in the car by removing power before it reaches the upper and lower limits of hoist way

36

Buffers

Springs or hydraulic shock absorbers at bottom of elevator shaft only stop in elevator car traveling in the normal rate of speed

37

Speed reducing switch

Speed governor. Snows drive motor man elevator starts to exceed safe speed. If continues to accelerate, applies car safeties and trips over speed switch

38

Overspeed switch

Activated it's been reducing switch fails,

39

Car safeties

Still jobs that wedged against guard rails and bring elevator to a stop. designed to stop freefalling car

40

Elevator pit

Extends down for the lowest floor landing to the bottom of the hoistway

41

Elevator hoistway is located in an atrium are not required to

Not required to be enclosed

42

Mushrooming

Tendency of heat smoke to rise until they encounter horizontal obstruction. At this point they will spread laterally until they encounter vertical obstruction and begin to bank downward

43

Elevator hoistway enclosures usually are required to be fire rated with

One or two hour rating depending on situation

44

building codes require venting at the top of almost every elevator hoistway because

To prevent mushrooming

45

The building contains three or fewer elevators code permits them to be in one hoistway. When four or more elevators are provided, there must be

A minimum of two separate hoistways

46

Express elevator hoistway is serving upper floors of tall buildings pertaining to entrances have

No entrances to the hoistway between the main entrance and lowest floor served

47

Single elevator hoistway that only serve upper levels have access doors for rescue purposes

Every three floors or so in that portion without normal hoistway doors (blind shafts)

48

In very tall buildings elevators are divided into zones with one zone serving lower floors and another serving upper floors. As own usually serves how many floors

15 through 20 floors

49

Blind hoistway

Used for express elevators that serves only upper floors of tall buildings. There are no entrances to the shaft on the floor is between the first floor and the lowest floor served

50

How many doors consist in an elevator door

Two, one for the past in your car, one for the hoistway. Passenger car door automatically opens hoistway doors at same time

51

Emergency exits on elevator cars

Hatch on the roof of the car, removable panel on the side of the car. Time-consuming only used as a last resort

52

Top exits are present in which type of elevator

Traction elevators, hydraulic elevators optionally

53

Some top panels are designed to be opened from inside the elevator but

All can be opened from the outside

54

In multiple elevator hoistways most elevator cars are equipped with

Side exits to allow passengers to be transferred laterally from a stalled car to functioning car

55

Older moving stairways or escalators, operate at what speed

90 through 120 ft./m, speeds now have been standardized at 100 ft./m

56

When serving more than two floors vertical openings created by escalators need to be

Protected. Commonly used with sprinklers and draft stop of 18 inches deep

57

Types of conveyor systems

Belt, roller, chain, screw, bucket, pneumatic

58

Utility Chase

Vertical pathway in a building that contains utility services such as plumbing electric telecommunications ductwork HVAC

59

Pipe chase

Concealed vertical channel and which pipes and other utility conduits are housed

60

Pipe chases must be surrounded by

Fire resistive construction to ensure fire safety