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TERMINOLOGY DESCRIPTION
Machine Room This is a separate room usually next to the hoistway to hold the
hydraulic power unit and motor control system.
Overhead Clearance This is the vertical clearance required to fit the elevator and its
drive components at the top floor. It is measured from the
upper floor level to top of the hoistway.
Pit This is the bottom area of the shaft that is below the lowest
floor level.
Plunger/Piston This is the rod portion of the hydraulic cylinder that extends
from the cylinder as hydraulic pressure is applied and is
attached to the sling.
Power Unit/Pump Unit This is a hydraulic power producing unit consisting of electric
motor, hydraulic pump, valving, and motor control panel.
Wire Rope This is wire cable.
Roped Hydraulic See Cable Hydraulic.
Safeties This is a mechanical device used to stop and support the
elevator cab, sling, and rated load if a failure in the normal
suspension means occurs.
Sling This is structural steel members that support the elevator cab.
The sling carries the cab up and down the hoistway.
Stiles These are vertical support members of the sling assembly.
Travel This is the distance from the bottom finished floor level to the
top finished floor level.
Traveling Cable This is the black flat multi-wire electrical cable connecting the
elevator control panel in the car to the pump unit, push buttons,
and safety devices.
Upstand Post The upstand post is a rigid steel post of varying lengths used to
support the jack unit.
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