Flashcards in Elevator Rescue Deck (27):
Cable (drum type and traction
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
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
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
Two Types of Traction Equipment
1. 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
2. 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
Limited to 6 stories
Older rams powered by water
Newer rams powered by oil pressure
Hydraulic Equipment Room
Lower level of building
but can be any floor 50-100' away from elevator shaft
Hydraulic Equipment Room Components
1. Controller or relay panel (electronics necessary to run the elevator)
2. Hydraulic power unit (reservoir for oil, hydraulic pump, and valves to raise/lower car)
Larger than passenger elevators
up to 3 tons
Modern elevators utilize two sets of doors for?
Operation and passenger ingress and egress
Inner Car Door
Door on elevator car
Travels with the elevator
Door that is seen from each floor
Part of building (each landing)
4 Types of Doors
Consists of a hoistway door that is manually opened and a single slide car door that is power operated by a collapsible gate
Power operated single panel doors
Two power operated panels that part simultaneously with a brisk, noiseless motion
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
Where is the power unit located that opens elevator doors?
Top of elevator car
Bottom of hoistway doors
Made of various plastic or phenolic materials
Gib Block Dimensions
Installed every 18" across the underside of door panel
Ride in tracks in floor landing
What guards against overspeeding?
A Centrifugal Force Governor
When a car travels in excess of ___ of top speed, governor will activate a safety stop device
Safeties are installed at the ___ of an elevator car and occasionally on ___ to provide positive emergency stopping when activated by the governor
Position personnel equipped with portable radios?
1. Elevator equipment room (access to main power switches and elevator equipment)
2. Floor where elevator is inoperable
Turn power off for at least ___ sec to allow relays to reset
Hydraulic elevators and some cable elevators the hoistway doors will open if the elevator is ___" above or below the floor level.