Glossary

General Terms Relating to Lifts

 

Automatic Rescue Device (ARD)
A device meant to bring a lift stuck between floors due to loss of power, to the nearest landing level in either direction and open the doors in order to allow trapped passengers to be evacuated. Such a device may use some form of internal auxiliary power source for such purpose, complying with all the safety requirements of the lift during normal run. The speed of travel is usually lower than the normal speed. On reaching the level, in case of manual door lifts, the device shall allow the door to be opened and in case of power operated door lifts the device shall automatically open the door.
Bottom Car Run-by
The distance between the car buffer striker plate and the striking surface of the car buffer when the car is in level with the bottom terminal landing.
Bottom Counterweight Run-by
The distance between the counter weight buffer striker plate and the striking surface of the counterweight buffer when the car is in level with the top terminal landing.
Oil buffer
A buffer using oil as a medium which absorbs and dissipates the kinetic energy of the descending car or counterweight.
Oil buffer stroke
The oil displacing movement of the buffer plunger or piston, excluding the travel of the buffer plunger accelerating device.
Spring Buffer
A buffer which stores in a spring the kinetic energy of the descending car or counterweight.
Spring buffer load rating
The load required to compress the spring by an amount equal to its stroke.
Spring buffer stroke
The distance, the contact end of the spring can move under a compressive load until the spring is compressed solid.
Call Indicator
A visual and audible device in the car to indicate to the attendant the lift landings from which calls have been made.
Car Bodywork
The enclosing bodywork of the lift car which comprises the sides and roof and is built upon the car platform.
Car Door Electric Contact
An electric device, the function of which is to prevent operation of the driving machine by the normal operating device of the lift unless the car door is in the closed position.
Car Frame
The supporting frame or sling to which the platform of the lift car, its safety gear, guide shoes and suspension ropes are attached.
Car Platform
The part of the lift car which forms the floor and directly supports the load.
Clearance
The part of the lift car which forms the floor and directly supports the load.
Bottom car clearance
The clear vertical distance from the pit floor to the lowest structural or mechanical part, equipment or device installed beneath the car platform, except the guide shoes, rollers, safety jaw blocks and platform apron or guard located within 300 mm, measured horizontally from the sides of the car platform when the car rests on its fully compressed buffers.
Top car clearance
The shortest vertical distance between the top of the car crosshead, or between the top of the car where no crosshead is provided, and the nearest part of the overhead structure or any other obstruction when the car floor is level with the top terminal landing.
Top counterweight clearance
The shortest vertical distance between any part of the counterweight structure and the nearest part of the overhead structure or any other obstruction when the car floor is level with the bottom terminal landing.
Control
The system governing starting, stopping, direction of motion, acceleration, speed and retardation of moving member.
Single-speed alternating current control
A control for a driving machine induction motor which is arranged to run at a single-speed.
Two-speed alternating current control
A control for a two-speed driving machine induction motor which is arranged to run at two different synchronous speeds either by pole changing of a single motor or by two different armatures.
Rheostatic control
A system of control which is accomplished by varying resistance or reactance or both in the armature or field circuit or both of the driving machine motor.
Variable voltage motor control (generator field control)
A system of control which is accomplished by the use of an individual generator for each lift wherein the voltage applied to the driving machine motor is adjusted by varying the strength and direction of the generator field.
Electronic devices
A system of control which is accomplished by the use of electronic devices for driving the lift motor at variable speed.
Alternating current variable voltage (ACVV) control
A system of speed control which is accomplished by varying the driving and braking torque by way of voltage variation of the power supply to the driving machine induction motor.
Alternating current variable voltage variable frequency (ACVVVF) control
A system of speed control which is accomplished by varying the voltage and frequency of the power supply to the driving machine induction motor.
Solid-State d.c. Variable Voltage Control
A solid-state system of speed control which is accomplished by varying the voltage and direction of the power supply to the armature of driving machine d.c. motor.
Deflector Sheave
An idler pulley used to change the direction of a rope lead.
Door (Lift Landing Door and Lift Car Door)
Door, centre opening sliding
A door which slides horizontally and consists of two or more panels which open from the centre and are usually so interconnected that they move simultaneously.
Door, mid-bar collapsible
A collapsible door with vertical bars mounted between the normal vertical members.
Door, multi-panel
A door arrangement whereby more than one panel is used such that the panels are connected together and can slide over one another by which means the clear opening can be maximized for a given shaft width. Multi panels are used in centre opening and two speed sliding doors.
Door, single slide
A single panel door which slides horizontally.
Door, two speed sliding
A door which slides horizontally and consists of two or more panels, one of which moves at twice the speed of the other.
Door, vertical bi-parting
A door which slides vertically and consists of two panels or sets of panels that move away from each other to open and are so interconnected that they move simultaneously.
Door, vertical lifting
A single panel door, which slides in the same plane vertically up to open.
Door, swing
A swinging type single panel door which is opened manually and closed by means of a door closer when released.
Door Closer
A device which automatically closes a manually opened door.
Door Operator
A power-operated device for opening and closing doors.
Dumb Waiter
A lift with a car which moves in guides in a vertical direction; has a net floor area not exceeding 1 m2 , total inside height of 1.2 m, whether or not provided with fixed or removable shelves; has a capacity not exceeding 250 kg and is exclusively used for carrying materials and shall not carry any person.
Electrical and Mechanical Interlock
A device provided to prevent simultaneous operation of both up and down relays or power contactors.
Electro-Mechanical Lock
A device which combines in one unit, electrical contact and a mechanical lock jointly used for the landing and/or car doors.
Floor Leveling Switch
A switch for bringing the car to level at slow speed in case of double speed or variable speed machines.
Floor Selector
A mechanism forming a part of the control equipment, in certain automatic lifts, designed to operate controls which cause the lift car to stop at the required landings.
Floor Stopping Switch
A switch or combination of switches arranged to bring the car to rest automatically at or near any pre-selected landing.
Geared Machine
A machine in which the power is transmitted to the sheave through worm and worm wheel or spur reduction gearing.
Gearless Machine
A lift machine in which the motive power is transmitted to the driving sheave from the motor without intermediate reduction gearing and has the brake drum mounted directly on the motor shaft.
Goods Lift
A lift designed primarily for the transport of goods, but which may carry a lift attendant or other personnel necessary for the loading or unloading of goods.
Guide Rails
The members used to guide the movement of a lift car or counterweight in a vertical direction.
Guide Rails Fixing
The complete assembly comprising the guide rails bracket and its fastenings.
Guide Shoe
An attachment to the car frame or counterweight for the purpose of guiding the lift car or counter weight frame.
Hoisting Beam
A beam, mounted immediately below the machine room ceiling/machinery space ceiling, to which lifting tackle can be fixed for raising or lowering parts of the lift machine.
Hospital Lift
A lift normally installed in a hospital, dispensary or clinic and designed to accommodate one bed or stretcher along its depth, with sufficient space around to carry a minimum of three attendants in addition to the lift operator.
Landing Call Push
A push button fitted at a lift landing, either for calling the lift car, or for actuating the call indicator.
Landing Door
The hinged or sliding portion of a lift well enclosure, controlling access to a lift car at a lift landing.
Landing Zone
A space extending from a horizontal plane 400 mm below a landing level to a plane 400 mm above the landing level.
Levelling Devices
Levelling device, lift car
Any mechanism which either automatically or under the control of the operator, moves the car within the levelling zone towards the landing only, and automatically stops it at the landing.
Levelling device, one way automatic
A device which corrects the car level only in case of under run of the car but will not maintain the level during loading and unloading.
Levelling device, two-way automatic maintaining
A device which corrects the car level on both under run and over-run and maintains the level during loading and unloading.
Levelling device, two way automatic non maintaining
A device which corrects the car level on both under run and over run but will not maintain the level during loading and unloading.
Levelling device, two way automatic non maintaining
A device which corrects the car level on both under run and over run but will not maintain the level during loading and unloading.
Levelling Zone
The limited distance above or below a lift landing within which the levelling device may cause movement of the car towards the landing.
Lift
An appliance designed to transport persons or materials between two or more levels in a vertical or substantially vertical direction by means of a guided car. The word ‘elevator’ is also synonymously used for ‘lift’.
Lift Car
The load carrying unit with its floor or platform, enclosing bodywork, and car door.
Lift Landing
That portion of a building or structure used for discharge of passengers or goods or both into or from a lift car.
Lift Machine
The part of the lift equipment comprising the motor and the control gear therewith, reduction gear (if any), brake(s) and winding drum or sheave, by which the lift car is raised or lowered.
Lift Pit
The space in the lift well below the level of the lowest lift landing served.
Lift Well
The unobstructed space within an enclosure provided for the vertical movement of the lift car(s) and any counterweight(s), including the lift pit and the space for top clearance.
Lift Well Enclosure
Any structure which separates the lift well from its surroundings.
Operation
The method of actuating the control of lift machine.
Automatic operation
A method of operation in which by a momentary activation of a call button the lift car is set in motion and caused to stop automatically at any required lift landing.
Non-selective collective automatic operation
Automatic operation by means of one button in the car for each landing level served and one button at each landing, wherein all stops registered by the momentary actuation of landing or car buttons are made irrespective of the number of buttons actuated or of the sequence in which the buttons are actuated. With this type of operation, the car stops at all landings for which buttons have been actuated making the stops in the order in which the landings are reached after the buttons have been actuated but irrespective of its direction of travel.
Single automatic operation
Automatic operation by means of one button in the car for each landing level served and one button at each landing so arranged that if any car or landing button has been actuated, the actuation of any other car or landing operation button will have no effect on the movement of the car until the response to the first button has been completed.
Group automatic operation
Automatic operation of two or more non-attendant lifts equipped with power-operated car and landing doors. The operation of the cars is coordinated by a supervisory operation system including automatic dispatching means whereby selected cars at designated dispatching points automatically close their doors and proceed on their trips in a regulated manner.
Group automatic operation
Automatic operation of two or more non-attendant lifts equipped with power-operated car and landing doors. The operation of the cars is coordinated by a supervisory operation system including automatic dispatching means whereby selected cars at designated dispatching points automatically close their doors and proceed on their trips in a regulated manner. Typically, it includes one button in each car for each floor served and up and down buttons at each landing (single buttons at terminal landings). The stops set up by the momentary actuation of the car buttons are made automatically in succession as a car reaches the corresponding landings irrespective of its direction of travel or the sequence in which the buttons are actuated. The stops set up by the momentary actuation of the landing buttons may be accomplished by any lift in the group, and are made automatically by the first available car that approaches the landing in the corresponding direction.
Car switch operation
Method of operation by which the movement of lift car is directly under the operation of the attendant by means of a handle.
Signal operation
Same as collective operation, except that the closing of the door is initiated by the attendant.
Double button (continuous pressure) operation
Operation by means of buttons or switches in the car and at the landings any of which may be used to control the movement of the car as long as the button or switch is manually pressed in the actuating position.
Operating Device
A car switch, push button or other device employed to actuate the control.
Overhead Beams
The members, usually of steel, which immediately support the lift equipment at the top of the lift well.
Over Speed Governor
An automatic device which brings the lift car and/or counter weight to rest by operating the safety gear in the event of the speed in a descending direction exceeding a predetermined limit.
PPosition and/or Direction Indicator
A device which indicates on the lift landing or in the lift car or both, the position of the car in the lift well or the direction in which the lift car is travelling or both.
Rated Load (Lift)
The maximum load for which the lift car is designed and installed to carry safely at its rated speed.
Rated Speed (Lift)
The mean of the maximum speed attained by the lift car in the upward and downward direction with rated load in the lift car.
Retiring Cam
A device which prevents the landing doors from being unlocked by the lift car unless it stops at a landing.
Roping Multiple
A system of roping where, in order to obtain a multiplying factor from the machine to the car, multiple falls of rope are run around sheave on the car or counterweight or both. It includes roping arrangement of 2 to 1, 3 to 1, etc.
Safety Gear
A mechanical device attached to the lift car or counterweight or both, designed to stop and to hold the car or counterweight to the guides in the event of free fall, or, if governor operated, of over-speed in the descending direction. Any anticipated impact force shall be added in the general drawing or layout drawing.
Service Lift
A passenger cum goods lift meant to carry goods along with people.
Sheave
A rope wheel, the rim of which is grooved to receive the suspension ropes but to which the ropes are not rigidly attached and by means of which power is transmitted from the lift machine to the suspension ropes.
Slack Rope Switch
Switch provided to open the control circuit in case of slackening of rope(s).
Suspension Ropes
The ropes by which the car and counter weight are suspended.
Terminal Slow-Down Switch
A switch when actuated shall compulsorily cut off the high speed and switch on the circuitry to run the lift in levelling speed before reaching on terminal landings.
Terminal Stopping Switch Normal
Switch for cutting off all the energizing current in case of car travelling beyond the top or bottom terminal landing or a switch that cuts off the energizing current so as to bring the car to a stop at the top or bottom terminal landing level in the respective direction of travel.
Terminal Stopping Device Final
A device which automatically causes the power to be removed from an electric lift driving machine motor and brake, independent of the functioning of the normal terminal stopping device, the operating device or any emergency terminal stopping device, after the car has passed a terminal landing.
Headroom / Overhead
The vertical distance from the level of the top lift landing to the bottom of the machine room slab.
Travel / Rise
The vertical distance between the bottommost and topmost lift landings served by the lift
Travel / Rise
The vertical distance between the bottommost and topmost lift landings served by the lift
Angle of Inclination
Maximum angle to the horizontal in which the steps, the pallets or the belt move.
Auxiliary Brake
Fail safe brake, which is used to stop an escalators/moving walk under all normal conditions or under certain fault conditions only, typically situated on one side of the main drive shaft.
Balustrade
Part of the escalator/moving walk which ensures the user's safety by providing stability, protecting from moving parts and supporting the handrail.
Balustrade Decking
Transverse member of the balustrade which meets the handrail guidance profile and which forms the top cover of the balustrade.
Brake Load
Load on the step/pallet/belt for which the brake system is designed to stop the escalator/moving walk.
Comb
Pronged section at each landing that meshes with the grooves of the steps
Comb Lighting
Small flush light panels located in the skirt panels on both sides of the escalators/moving walk unit at both upper and lower landing and immediately adjacent to the comb teeth to illuminate the comb and step tread and assist passengers boarding and alighting the escalators/moving walk.
Comb Plate
Platform at each landing to which the combs are attached.
Comb Plate Switch
Switch in safety circuit that opens when excessive force is detected in vertical and/or horizontal direction on the comb or comb plate of escalators/moving walk.
Comb Teeth
Series of teeth which ride the grooves of the escalators/moving walk step tread as the step passes underneath and are designed so as to allow them to break off if a wedging action should occur at their point of contact with step tread.
Emergency Brake
Auxiliary mechanically automatically operated brake, which will stop a fully loaded escalator, if the drive chain breaks.
Emergency Stop Switch
Separate stop button usually located in adjacent walls, columns or within the balustrade providing the facility to stop the escalator/moving walk, in the event of emergency.
Inspection Door
Means of access to equipment areas and other spaces pertaining to an escalators/moving walk installation such as machinery spaces etc. And with access usually restricted to authorized persons.
Safety Devices
Part of a safety circuit consisting of safety switches and/or fail safe circuits.
Escalator
Power-driven, inclined, continuous moving stairway used for raising or lowering persons in which the user carrying surface (for example, steps) remains horizontal.
Exterior Panel
Part of the exterior side of the enclosure of an escalator or moving walk.
Handrail
Power-driven moving rail for persons to grip while using the escalator or moving walk.
Interior Panel
Panel located between the skirting or lower inner decking and the handrail guidance profile or balustrade decking.
Lower Inner Decking
Profile that connects the skirting with the interior panel when they do not meet at a common point.
Lower Outer Decking
Profile that connects the exterior panels with the interior panel.
Machinery
Escalator or moving walk machine(s) mechanisms and associated equipment.
Machinery Spaces
Space(s) inside or outside of the truss where the machinery as a whole or in parts is placed.
Moving Walk
Power-driven installation for the conveyance of persons in which the surface carrying the users remains parallel to its direction of motion and is uninterrupted (for example, pallets, belt).
Newel
End of the balustrade.
Nominal/Rated Speed
Speed in the direction of the moving steps, pallets or the belt stated by the manufacturer for which the escalator or moving walk has been designed, without load on the steps/pallets/belt at nominal frequency and nominal voltage.
Pit
Recess in the floor to receive that portion of the lower landing and the lower end of the incline section which occurs below the floor line when there is no floor under the escalator such as in a basement.
Rated Load
Load which the equipment is designed to move.
Rise (Travel)
Vertical distance between the upper and lower finished floor levels.
Safety Circuit
Part of the electric safety system consisting of electrical safety devices.
Skirting
Vertical part of the balustrade interfacing with the steps, pallets or belt.
Skirt Deflector
Device to minimize the risk of trapping between the step and the skirting.
A95
Values of acceleration or vibration within defined boundaries or limits, in which 95 percent of observed values fall. This value is used statistically to estimate typical levels.
Acceleration
Rate of change of z-axis velocity, attributed to lift motion control.
Axis of Measurement

Orthogonal reference axes for the measurements as follows:

X axis – axis perpendicular to the plane of the car front door (that is back to front)

Y axis – axis perpendicular to X and Z (that is side to side)

Z axis – axis perpendicular to the car floor (that is vertical)

Equivalent Sound Pressure Level (LAeq)
Average A-weighted sound pressure level, using frequency weighting A and time weighing 'fast', determined within defined boundaries.
Jerk –
Rate of change of z-axis acceleration, attributed to lift motion control. It is expressed in metre per second cube (m/s3).
Lift Ride Quality
Sound levels in the car, and vibration of the car floor, relevant to passenger perception, associated with lift motion.
Peak to Peak Vibration Levels
Sum of the magnitudes of two peaks of opposite sign separated by a single zero crossing.
Sound
A-weighted sound pressure level measured in decibels (dB).
Sound Pressure Level (Lp,A)
Ten times the logarithm to the base 10 of the ratio of the square of the sound pressure measured (pA) to the square of the reference sound pressure (p0).
V95
Value of velocity within defined boundaries or limits, in which 95 percent of observed values fall. This value is used statistically to estimate typical levels.
Velocity
Rate of change of z-axis displacement, attributed to lift motion control.
Vibration
Variation with time of the magnitude of acceleration, when the magnitude is alternately greater and smaller than a reference level. It is expressed in m/s2.

Terms Relating to Planning and Design of Lifts

Door Closing Time (tc)
Time period measured from the instant that car doors start to close until the doors are locked.
Door Opening Time (to)
Time period measured from the instant that car doors start to open until they are open 800 mm.
Door-to-Door Time (T)
Time period measured from the instant that car doors start to close to the instant that the car doors are open 800 mm at the next adjacent floor.
Handling Capacity (HC)
The number of passengers that a lift system can theoretically transport during the up-peak traffic condition with car occupancy of 80 percent of the actual capacity expressed as a percent of the total building population.
Interval (INT)
Time period between successive car arrivals at the main terminal floor with cars loaded to any value.
Nominal Travel Time (NTT)
The nominal travel time is defined as the time it would take to run a distance of the total travel at the rated speed of the lift without taking into account the acceleration and deceleration of the car or the intermediate stops of real runs.
Passenger Arrival Rate
Percentage of a building’s population arriving within a 5-minute period.
Passenger Average Transfer Time (tp)
Average period of time required for a single passenger to enter or leave the lift car.
Passenger Average Waiting Time (AWT)
Average period of time from the instant a passenger registers a landing call or joins a queue, until the responding lift begins to open its doors at the boarding floor. AWT is not the same as INT.
Round Trip Time (RTT)
The average time taken by a single lift to make a trip from the main terminal back to the main terminal, starting from the time the car doors open at the main terminal until the car doors re-open at the main terminal after serving all demand along the way.
Single Floor Flight Time (tf1)
Period of time measured from the instant that the car doors are locked until the lift is level at the next adjacent floor.
Single Floor Transit Time (tv)
Period of time required to transit two adjacent floors at rated speed.
Sky Lobby
A sky lobby is the main floor for local groups in the upper part of a very tall building.

Terms Relating to Seismic Operation of Lifts

Snag Point
The point of interference between flexible elements (for example ropes, chains, travelling cable, etc) and fixed elements (for example by guide rail brackets, guide rail clip bolts, fishplates, vanes, and similar devices).
Design Acceleration (ad)
The horizontal acceleration to be used for calculation of forces (moments acting on lift systems and arising from seismic events).
Seismic Trigger Level
Seismic acceleration which is used to activate a seismic detection system.
Seismic Mode
Special mode in which the lift operates after detection of seismic trigger level.
Seismic Stand-By Mode
Special mode in which the lift operates after detection of primary earthquake wave without the activation of the seismic detection system.
Normal Operation
Operation mode in which the lift performs when not in seismic mode or in seismic stand-by mode.
Retaining Device
Mechanical device securely fixed to a structural member of the lift car, counterweight frame designed to retain the lift car and counterweight within its guide rails during seismic activity.

Terms Related to Maintenance of Lifts

Maintenance Organization
Company or part of company where competent maintenance person(s) carry out maintenance operation on behalf of the owner of the installation.
Competent Maintenance Person
Designated person, suitably trained, qualified by knowledge and practical experience, provided with necessary instructions and supported within their maintenance organization to enable the required maintenance operations to be safely carried out.
Manufacturer
Natural and legal person who takes responsibility for the design, manufacture and placing on the market either of safety components for lifts or complete lift.
Installer
Natural or legal person who takes responsibility for the design, manufacture, installation and placing on the market of lifts.
Installation
Completely installed passenger lift or good passenger lift or accessible goods only lift or service lift.

Terms Relating to Performance Requirements for Lifts

ACVF / V3F / VF AC Variable voltage variable frequency - the method by which the motion (acceleration and deceleration) is controlled
ACVF Drive / Inverter
The device which varies voltage and frequency supply to the machine to control the machine speed.
Average Travel (Transit) Time (ATT)
Is the average period of time, in seconds, which an average passenger takes to travel from the main terminal floor to the requested destination floor measured from the time the passenger enters the lift until alighting at the destination floor.
Average Waiting Time (AWT)Avergae Time to Destination
Is the average period of time, in seconds, that an average passenger spends waiting for alift, measured from the instant that the passenger first registers a landing call (or arrives at the landing) until the instant the passenger can enter the lift
(ATD) / Average Journey Time (AJT)
Is the average period of time, in seconds, measured from the instant an average passenger first registers a landing call (or arrives at the landing) until alighting at the destination floor
Brake
An electro-mechanical device used to prevent the elevator from moving when the car is at rest and no power is applied to the hoist motor.
Buffer
A device designed to stop a descending car or counterweight beyond its normal limit of travel by storing or absorbing and dissipating the kinetic energy of the car counterweight. A buffer can be a spring buffer or oil buffer.
Capacity Factor / Car Capacity
The % of the rated capacity to which the elevator car will normally be loaded.
Car / Cabin
The load carrying unit including its platform, car frame, enclosure and car door.
Controller
A device which serves to control the equipment to which it is connected (machine / door operator etc.)
Counterweight
A weight which counterbalances the weight of an elevator car plus a part of the capacity load
Elevatoring
Is the technique of applying the available elevator technology to satisfy the traffic demands in a building, involving calculations and simulations of the elevator system performance on basis of estimations of population and patterns.
Elevators / Lifts
A hoisting and lowering mechanism, equipped with a car which moves in guide rails and serves two or more landings with the purpose of transporting people, freight etc. In British English and other Commonwealth countries, elevators are known more commonly as lifts
Escalators A power driven inclined continuous stairway used for raising or lowering passengers
Fire lift
The designated lift which can be recalled to the designated landing through a device like a fireman's switch and permitting special operation by the fire fighters or other authorized emergency personnel
Handling Capacity (HC)
The total number of passengers that it can transport in a period of 5 minutes as a percentage of the total building population
Hoistway
A shaft way for the travel of an elevator or dumbwaiter. It includes the pit and terminates at the underside of the overhead
Interval (INT)
Is the average time between successive lift car arrivals at the main floor with cars loaded to any level
Machine
The power unit which applies the energy necessary to raise and lower an elevator or dumbwaiter car . The normal machines would be a geared traction machine or a gearless traction machine.
Moving Walks
A type of passenger carrying device on which passengers stand (or walk) and in which the passenger carrying surface remains parallel to its direction of motion and is uniniterrupted. They can be horizontal moving walks or inclined moving walks.
Over head
The upper end of the elevator hoistway. Measured from the top landing level to the bottom of the machine room floor slab (or the hoistway roof for machine room less elevators or basement drives)
Over Speed Governor
A mechanical speed control mechanism. Normally it will be a centrifugal device used to stop and hold the movement by initiating the activation of the safety gear as well as cutting of power to the drive motor and brake
Pit / Pit Depth
That portion of the hoistway extending from the sill level of the lowesy landing to the floor at the bottom of the hoistway.
Rails
Normally steel T-section with machined guiding surfaces installed vertically in a hoistway to guide and direct the course of travel
Rope
A construction of twisted fibres or wire to form a inter-twisted strong cord. Wire rope is an assembly of multi-wire twisted around a fiber or steel core
Round Trip Time (RTT)
Is the time in seconds for a single car trip through a building from the time the car doors open at the main terminal landing, until the doors reopen, when the car has returned to the main terminal floor, after its trip through the building.
Safety Gear
The safety gear is a mechanical device for stopping the car by gripping the guide rails in the event of the car speed attaining a predetermined value in a downward direction of travel, irrespective of what the reason for the increase in speed may be. The safety gear can be instantaneous or progressive. The counterweight will also be provided with safety gears if the area below the pit is to be occupied. In recent times the car also be provided with safety operating in both directions.
Traffic Analysis
Analyses to determine the likely performance of the elevator system
Travel / Rise
The vertical distance between the bottom terminal landing and the top terminal landing of an elevator, dumbwaiter or escalator
Vertical Transportation System
The mechanical transportation system to move people and material within a building like elevators, escalators, moving walks, dumbwaiters etc.