Classroom on demand

Welcome to Classroom on demand, your source for educational materials related to the vertical transportation industry. This site represents the knowledge and expertise of the best engineers and mechanics in the elevator industry, and will help those new to the elevator industry learn about the basic workings of elevator systems, and also will serve as a reference for people with more experience.

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1 Glossary

Anchor BoltsBolt designed to fasten rail brackets, door sills, headers or other ...
Angle of Contact (Wrap)The angle of rope contact or wrap determines how much tra...
Basement /Adjacent Machine RoomThe traction elevator machine is placed either in...
BedplateA steel or cast-iron platform on which a machine is placed
Blocking BeamsSteel placed on machine beams to raise the level of machine room e...
BrakeA spring-loaded clamping device that prevents the elevator from moving when...
Brake DrumA round, machined surface on the motor shaft which the brake clams for...
Cable WrapThe amount of the drive sheave actually in contact with the cable.
CablesRopes, usually 4 to 6 in number, used to support the car. Ropes pass over...
Compensating ChainWelded-link chain used to compensate the weight of hoist rope....
Compensating RopeWire roping installed to obtain hoist rope weight compensation....
Compensating Rope SheaveA device, which automatically causes the electric power ...
CompensationUsing ropes, chain or other design to counterbalance transfer of hoi...
ControllerAn electrical panel which performs many computer functions by which it...
CounterweightAdded weight on traction elevators which counterbalances the weight...
Counterweight FillersMetal pieces stacked and bolted together within a frame to ...
Double-wrappedRoping arrangement on gearless traction elevators, where the hoist...
Drive MachineThe power unit which applies the energy necessary to raise and lowe...
Emergency BrakeMounted on the drive step chain sprocket shaft and arranged to op...
Gear - RingA large gear driven by the worm gear which is attached to the drive s...
Gear - WormA spiral gear connected to and driven by the motor and which drives t...
GovernorThe governor is a mechanical speed control mechanism. The governor monit...
Governor RopeWire rope with at least one end fastened to the safety activating m...
Hitch PlateA plate (on traction elevators) clamped to the underside of the cross...
Machine – GearedGeared Traction machines for elevators of 500 fpm of less in whi...
Machine – GearlessGearless Traction machines for elevator of 500 fpm or higher i...
Machine BeamsHorizontal steel beams that support the elevator driving machine of...
Machine RoomA room where traction machines or hydraulic power units for elevator...
Machine Room-Less (MRL) ElevatorInitials for Machine Room-Less elevator. There ...
One to One Roping (1:1)Arrangement of elevator hoist ropes in which one end of e...
OverheadThe upper portion of the elevator hoistway. Overhead is determined by t...
Overhead MachineStandard machine room location on a traction elevator, the machi...
Passenger ElevatorAn elevator used to carry people.
PenthouseThe machine room above the hoistway on traction elevators.
Ropes (Hoist)For traction elevators, a strong cord of twisted fibers such as ste...
SafetyDevice on the car or counterweight that will stop the car or counterweight...
Safety HousingA large clamp that anchors the car to the building to keep the ele...
Safety PlankThe bottom member of a sling for a traction elevator which contains ...
ShackleThreaded rods to which the hoist cables are socketed and which bolt to th...
SheaveWheel that is mounting in bearings and having one or more grooves over whi...
Sheave – CompoundA pulley located on the car and on the counterweight, under whi...
Sheave – DeflectorA pulley aligned with the drive sheave, which provides a path ...
Sheave – DriveThe grooved wheel of a traction machine over which hoist ropes are...
Sheave – SecondaryA pulley on a gearless machine which serves two purposes - 1. ...
Structural SlabA reinforced concrete slab that support the elevator driving mach...
TorqueThe pulling effort developed by the motor
TractionOne of two methods by which an elevator is moved, whereby the elevator i...
Two to One Roping (2:1)Arrangement of hoist ropes in which one end of each hoist...
U-shaped GrooveA groove in the drive sheave which produces no pinching or wedgin...
Variable Voltage, Variable Frequency (VVVF)A method of controlling an AC motor t...
V-shaped GrooveA groove in the drive sheave which produces a pinching or wedging...

2 Basic Elevator Design

Geared Traction Elevator AC Geared Motor assembly, which rotates the drive syste...
Gearless Traction Elevator Our AC Gearless Line of elevators designed for High S...
Freight Elevator The elevator designed and used for carrying material rather tha...
Limit Switches - TeeLimit Switches (see file 1009-16)For geared traction elevato...

4 The Traction Elevator

Rail Module The rail module contains the guide rails (typically 16 feet long).Co...
Machine ModuleA traction machine is used on all traction elevator equipment type...
Governor Module The governor, which is located in the machine room or overhead d...
Controller/Selector ModuleController/Selector Module: The controller, using micr...
Entrance ModuleEntrance: The framework for the opening is called the entrance a...
Cab ModuleCab Module: The cab module may be either a passenger or freight type. ...
Door Equipment ModuleDoor Equipment Module: The door equipment module consists o...
Door Protection ModuleDoor Protection Module: This module contains assemblies th...
Fixture ModuleFixture Module: The car operating panel and hall push buttons all...
Wiring Package ModuleWire Package Module: The wiring package module contains mat...
Accessories ModuleAccessories Module:This module contains a number of individual...
Car Sling - GearedSling The sling is the framework which encloses the cab. The r...
Car Sling - GearlessIsolated PlatformThe platform serves as the base on which yo...
Counterweights - GearedThe counterweights consist of individual flat plates of s...
Counterweights - Gearless The counterweights consist of individual flat plates o...
Geared MachineTraction = A traction elevator configuration uses ropes (cables) t...
Geared Traction Drive SheaveThe geared traction drive sheave has "V" shaped groo...
Gearless Traction MachineThis example shows the drive system of an overhead gear...
GovernorThe governor is a mechanical speed control mechanism. The governor monit...
Safeties Safeties The purpose of the safeties is to stop and hold the car if the...
Rope Compensation When the hoist ropes reach a certain length, their weight can ...

5 Machine Room-Less (MRL)

Traction Machine Room-Less (MRL) The Machine Room-Less (MRL) elevator is now ava...
synergy Product Line synergy offers elevators ranging from limited-option, cost-...

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