• June 29, 2020
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Escalator Parts, Terms & Definitions

The parts, terms and definitions which are used for escalators and moving walks are as below.
  1. Authorized Person
  2. Professional, trained individual with approval to reach restricted areas of escalators and moving walks (machinery spaces, separated machine rooms) and to work there with the purpose of assessment, testing and support.
  3. Competent Person
  4. A person with the required technical knowledge, skills, qualification and experience to perform work or task.
  5. Angle of Inclination
  6. The angle at which the escalator inclined section meets with the horizontal.
  7. Capacity
  8. Maximum traffic flow of users transferred at optimal conditions per hour.
  9. Rise/Height
  10. Elevation height is the difference between the surfaces of two building floors.
  11. Nominal Speed
  12. The speed of the moving step, pallet or belt without load as stated by the manufacturer, which must be equal to or less than the authorized speed.
  13. Machinery
  14. Machines, parts, equipment, etc. related to escalators and moving walks.
  15. Machinery Spaces
  16. Internal or external spaces of the truss where parts or all of the machines are installed.
  17. Step or Pallet
  18. The part that the users stand on. Steps are horizontal and vertical plates like stairs, but pallets are horizontal pieces laid beside each other.
  19. Step Demarcation
  20. The part(s) on the edge of the step(s) made of yellow plastic, indicating the safe area of the step or pallet to stand on for the users.
  21. Step Roller
  22. Two rollers under the step located on the rails that move the steps forward.
  23. Comb
  24. Toothed parts at each landing that meshes with the grooves of the step surface.
  25. Comb Plate
  26. The platform on both landings that the combs are installed on.
  27. Floor Plate/Floor Cover
  28. The platform surface on both landings that are installed before the comb plates, also utilized as machine room covers.
  29. Handrail
  30. A moving rubber rail for the users to hold and keep their balance on the escalator or moving walk.
  31. Handrail Entrance
  32. The part where the handrail enters/exits the interior area. Each escalator or moving walk has 4 handrail entrances.
  33. Handrail Inlet Guard
  34. A part made of rubber that is fitted in the center of the handrail entrance and the handrail passes through this part.
  35. Handrail Frame
  36. A rail that the handrail is fixed on.
  37. Handrail Return Guide
  38. A part made of hard plastic located before the handrail frame and guides the handrail from the internal space onto the handrail frame and vice versa.
  39. Handrail Guide Roller
  40. A part in the shape of a roller that causes more smooth movement in the internal spaces.
  41. Fraction Wheel/Handrail Drive
  42. A large wheel with a rubber edge located inside the handrail that moves it.
  43. Handrail Pressure Belt
  44. A pressure belt composed of smaller rollers under the fraction wheel which the handrail passes through them and presses the handrail onto the fraction wheel.
  45. Handrail Tension Device
  46. A pressure belt composed of smaller rollers behind the fraction wheel which the handrail passes over and can tighten or untighten the handrail.
  47. Balustrade
  48. A part of the escalator/moving walk on both sides that provides safety for the users as well as supporting the handrail, made from glass or stainless steel materials. There are two types of balustrade ‘Slim’ and 'Solid'.
  49. Upper Balustrade Decking
  50. Specifically, in solid balustrades, we have upper balustrade decking leading to the handrail fame, composed of upper inner & outer deckings.
  51. Lower Balustrade Decking
  52. In the lower balustrade panel, there are two deckings, composed of inner & outer.
  53. Balustrade Clamps
  54. A rail that slim balustrade panels are fitted into and are used as clamps for this purpose.
  55. Skirt Panel
  56. A vertical panel of the balustrade located beside the steps with a specific authorized distance on the entire route.
  57. Step Guide Roller
  58. A device adjusting the distance between the step and skirting.
  59. Truss
  60. A chassis made of steel on which all the machinery is installed.
  61. Truss Soffit
  62. Steel plates installed on the underside of the truss.
  63. Truss Support Angle
  64. Angle steel profile used to install the escalator on the beam of the building.
  65. Middle/Intermediate Support
  66. A support(s) that prevents truss sagging when the horizontal length is long.
  67. Step Chain
  68. A chain fitted with rollers at regular intervals installed on both sides of the steps that are linked together by axels between them with escalator steps mounted on the axels, turning around the drive shaft.
  69. Drive Chain
  70. The chain that transmits the motive force from the gearbox shaft to the escalator drive  shaft.
  71. Newel Chain/Handrail Diverter Roller
  72. A chain with several small bearings that is located at the curved ends of the balustrade and installed under the handrail for smoother movement of the handrail.
  73. Control Panel/Control Cabinet
  74. Each escalator/moving walk has two control panels, installed at the upper and lower machine rooms.
  75. Drive Motor
  76. A machine which converts electrical energy into mechanical energy to power machinery.
  77. Gearbox
  78. A device which is composed of gears and gear trains, used to give speed and torque conversions, from a rotating power source to other devices. The gearbox, contains gears and gear trains, altering torque and speed between a driving device like a motor and a load.
  79. Flywheel
  80. A wheel installed above the motor to manually drive the motor in emergency cases.
  81. Brake Load
  82. The load of the step/pallet and standing people that the brake system must stop.
  83. Drive Shaft
  84. Large mechanical wheels located in both upper and lower machine rooms that turn the step chains.
  85. Ceiling Opening Length
  86. In order to install an escalator in a building, an opening must be considered on the upper floor with the appropriate length.
  87. Escalator Pit
  88. In order to install an escalator, a pit must be considered on the lower floor with the appropriate length, width and depth.
  89. Horizontal Steps
  90. For the safety of the passengers, there must be a number of horizontal steps in both landings.
  91. Utilization
  92. Escalators, based on their use, are divided into two categories of 'Commercial' and 'Infrastructure'.
  93. Installation Environment
  94. Escalators, based on their environment are divided into three categories of 'Indoor', 'Semi Outdoor' and 'Fully Outdoor'.
  95. Safety System
  96. An arrangement of safety circuits and monitoring devices used to ensure the safety of the electrical control system.
  97. Safety Devices
  98. The safety circuit including safety switches, fail-safe circuits performing safety functions.
  99. Fail-safe Circuit
  100. Defined failure mode behavior in electrical and electronic systems.
  101. Safety Circuit
  102. The electric safety system consisting of safety devices.
  103. Safety Integrity Level (SIL)
  104. Discrete level for specifying the safety integrity requirements of the safety functions allocated to the E/E/PE. Note 1 to entry: In this European Standard SIL 1 represents the lowest level and SIL 3 the highest, even when it does not make use of SIL 3.
  105. Electrical, Electronic and Programmable Electronic Devices, E/E/PE
  106. Control, protection or monitoring based system, used for safety, installed on one or more electrical, electronic or programmable electronic devices, which includes every element of the system (power supplies, sensors and other input devices, data highways and other communication paths, and actuators and other output devices).
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