Elevator Rescue Flashcards
Elevator Rescue
Types
Cable (drum type and traction
Hydraulic
Elevator Rescue
Drum Type
Car attached to one or more cables that pass around a winding drum and to a moving counterweight.
150’ lifts and slow speed
Requires more space
Elevator Rescue
Equipment Room Locations
Drum-Basement or on roof
Traction-roof or above an elevator shaft in high rise
Hydraulic-lower level of building, any floor 50-100’ away from shaft
Elevator Rescue
Traction Type
Used for higher lifts and greater speeds
Cables are attached to the car and pass over a traction sheave to counterweights.
Cables passing over the traction sheave unwind as fast as they wind
Car speed is dependent on size of traction sheave and electric motor speed
Elevator Rescue
Two Types of Traction Equipment
- High speed direct traction or gearless type traction: slow speed DC motor directly coupled to a traction sheave with a brake wheel mounted on the motor shaft
- Geared traction type uses a high speed motor. Motor is geared to a traction sheave through worm gears with a brake wheel between the worm gears and motor
Elevator Rescue
Hydraulic
Limited to 6 stories
Older rams powered by water
Newer rams powered by oil pressure
Elevator Rescue
Hydraulic Equipment Room
Lower level of building
but can be any floor 50-100’ away from elevator shaft
Elevator Rescue
Hydraulic Equipment Room Components
- Controller or relay panel (electronics necessary to run the elevator)
- Hydraulic power unit (reservoir for oil, hydraulic pump, and valves to raise/lower car)
Elevator Rescue
Freight Elevators
Larger than passenger elevators
12x14’
up to 3 tons
Elevator Rescue
Modern elevators utilize two sets of doors for?
Operation and passenger ingress and egress
Elevator Rescue
Inner Car Door
Door on elevator car
Travels with the elevator
Elevator Rescue
Outer/Hoistway Door
Door that is seen from each floor
Part of building (each landing)
Elevator Rescue
4 Types of Doors
Swing Hall
Single Slide
Center Opening
2 Speed
Elevator Rescue
Swing Hall
Consists of a hoistway door that is manually opened and a single slide car door that is power operated by a collapsible gate
Elevator Rescue
Single Slide
Power operated single panel doors
Elevator Rescue
Center Opening
Two power operated panels that part simultaneously with a brisk, noiseless motion
Elevator Rescue
2 Speed
Two power operated panels that are geared together.
One door moves twice as fast as the other door so that both doors will meet concurrently int he open position
Elevator Rescue
Where is the power unit located that opens elevator doors?
Top of elevator car
Elevator Rescue
Gib Blocks
Bottom of hoistway doors
Made of various plastic or phenolic materials
Elevator Rescue
Gib Block Dimensions
3" wide 1" high 1/2" thick Installed every 18" across the underside of door panel Ride in tracks in floor landing
Elevator Rescue
Brakes
What guards against overspeeding?
A Centrifugal Force Governor
Elevator Rescue
Brakes
When a car travels in excess of ___ of top speed, governor will activate a safety stop device
20%
Elevator Rescue
Brakes
Safeties are installed at the ___ of an elevator car and occasionally on ___ to provide positive emergency stopping when activated by the governor
Bottom
Counterweights
Elevator Rescue
Rescue Guidelines
Position personnel equipped with portable radios?
- Elevator equipment room (access to main power switches and elevator equipment)
- Floor where elevator is inoperable
Elevator Rescue
Turn power off for at least ___ sec to allow relays to reset
30 sec
Elevator Rescue
Hydraulic elevators and some cable elevators the hoistway doors will open if the elevator is ___” above or below the floor level.
6”
Elevator Rescue
Some CABLE elevators the hoistway doors will open if the elevator is ___ above or below the floor level.
18”
