BOOK 29 TRUCK OPERATIONS MANUAL CHAPTER 4 ELEVATOR RESCUE Flashcards
Currently, there are two types of elevators:
Cable operated
Hydraulic operated
Candle elevators are what 2 types
Drum or traction type
A winding drum type elevator consists of a car attached to one or more cables that pass around a winding drum and to a moving
Counterweight
The drum is grooved for __________ movement
Cable movement
What cables run in the same groove
Counterweight cables and car cables
The equipment room for drum type may be located
In a basement or roof
Limitations in the length and diameter of the winding drum restricts this type of elevator to _____foot lifts and slow speeds.
150’
What type of cable elevators is no longer manufactured
Drum type
are used for higher lifts and greater speeds than drum type elevators and use a traction sheave instead of a winding drum.
Traction type elevators
In traction type elevators, cables are attached to the _____ and pass over a traction sheave to _____________.
Car counterweights
cables passing over the traction sheave unwind as fast as they wind and car speed is dependent on the size of the _________ _____________ and the _________ __________ speed.
Traction sheave
Electric motor speed
Two types of traction equipment
High speed direct traction or gearless type traction
Geared traction type
High speed direct traction or gearless type traction consists of a slow speed____ ________ directly coupled to a traction sheave with a brake wheel mounted on the ______ ______.
Dc motor
Motor shaft
Geared traction type uses a ______ _______ motor. The motor is geared to a traction sheave through worm gear with a _______ ________ between the worm gears and motor.
High speed motor
Brake wheel
Since there is less weight and equipment with traction type elevators, the equipment room is usually located on the ______ or above an ______ _______ in high-rise buildings.
Roof
Elevator shaft
hydraulic elevators use hydraulic power instead of cables and traction sheaves and are generally limited to ____ story buildings.
6 stories
Hydraulic elevators
In very old installations, a car is raised or lowered by a ram powered by
Water pressure
Hydraulic elevators
Newer installations use ____ _______ to power a ram.
Oil pressure
Some less modern hydraulic elevators and hydraulic elevators that travel over six stories may use
Cables and counterweights
The equipment rooms for hydraulic elevators are normally located at the lower level of a building, but can be at any floor level or __ to _____ feet away from the elevator shaft.
50 to 100
Hydraulic elevators equipment room contains
Controller or relay panel
Hydraulic power unit
are designed to quickly move passengers to different levels within a multi-story building.
Passenger elevators
Passenger elevators are normally faster then _______ elevators and often use _________ elevators that can not stop at all floors.
Freight elevators
Express elevators
freight elevators can be as large as ___ feet by ___ feet and have a carrying capacity of up to ______ tons.
12-14
3 tons
Generally, freight elevators are separate from the main lobby of a building and can have a ______, ______, or _______ _______access.
Street, alley or loading dock access
Modern elevators utilize two sets of doors for operation and passenger ingress and egress.
Car door
Hoistway door
The door on the elevator car is referred to as the ______ or _____ door and travels with the elevator car.
Inner or car door
The door that is seen from each floor of a building is referred to as the _______ or _______ door.
Outer or hoistway door
The ______ door does all the work; the ________ door is dependent
Car door
Hoistway door
There are four basic types of doors used on elevators:
Swing hall doors
Single slide doors
Center opening doors
Two speed doors
consists of a hoistway door that is manually opened and a single slide car door that is power operated or a collapsible gate.
Swing hall doors
are power operated single panel doors.
Sign slide doors
consist of two power operated panels that part simultaneously with a brisk, noiseless motion.
Center opening doors
consist of 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 in the open position.
Two speed doors
Elevator doors are normally opened by a power unit that is located on
On top of the elevator car
A _______ _______ (clutch, vane, bayonet, or cam) contacts ________ on the hoistway door which releases the door latch on the hoistway door.
Pick-up arm
Rollers
The bottom of hoistway doors are equipped with
Gib locks
Gib locks
They are made of various plastic or
Phenolic materials
Gib blocks are approximately __” wide, __” high, ___” thick and are installed every ___-inches across the underside of the door panel.
3’’ wide 1’’ high, 1/2’’ thick
18’’
Normal hoistway doors can be expected to utilize How many gib locks
2
Elevators are provided with brakes for normal operation and are similar to
Automotive breaks
A centrifugal force governor is provided on most elevators to guard against overspeeding (when a car travels in excess of __% of top speed, the governor will activate a safety stop device)
20%
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
On elevators capable of high speeds, ________ are forced between two jaws and the vertical rail is gripped with increasing force to slow a runaway elevator car to a gradual stop.
Wedges