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Flashcards in 4 Building Systems Deck (107)
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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


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


Traction motor braking system

Drum break located on the shaft of the drive motor


Safety mechanisms for elevators

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


Terminal device

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



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


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


Overspeed switch

Activated it's been reducing switch fails,


Car safeties

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


Elevator pit

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


Elevator hoistway is located in an atrium are not required to

Not required to be enclosed



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


Elevator hoistway enclosures usually are required to be fire rated with

One or two hour rating depending on situation


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

To prevent mushrooming


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


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


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)


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


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


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


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


Top exits are present in which type of elevator

Traction elevators, hydraulic elevators optionally


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

All can be opened from the outside


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


Older moving stairways or escalators, operate at what speed

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


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


Types of conveyor systems

Belt, roller, chain, screw, bucket, pneumatic


Utility Chase

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


Pipe chase

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


Pipe chases must be surrounded by

Fire resistive construction to ensure fire safety