Lift Glossary

Apron : Smooth vertical part extending downwards from the sill of the landing or car entrance

Balancing weight : Mass, this saves energy by balancing all, or part of the mass of the car.

Buffer : A resilient stop at the end of travel, and comprising a means of braking using fluids or springs (or other similar means).

Car : A part of the lift, which carries the passengers and/or other loads.

Clamping device : A mechanical device which when activated stops the car in downward motion and maintains it stationary at any point of the travel to limit the extent of creep.

Direct acting lift : Hydraulic lift where the ram or cylinder is directly attached to the car or its sling.

Down direction valve : Electrically controlled valve in a hydraulic circuit for controlling the descent of the car.

Electrical anti-creep system : A combination of precautions against the danger of creeping.
Electric safety chain:The total of the electric safety devices connected in series.

Full load pressure : Static pressure exerted on the piping directly connected to the jack, the car with the rated load being at rest at the highest landing level.

Goods passenger lift : A lift mainly intended for the transport of goods.

Guide rails : The rigid components, which provide guiding for the car or the balancing weight, if there is one.

Headroom : Part of the well between the highest landing served by the car and the ceiling of the well.

Hydraulic lift : Lift in which the lifting power is derived from an electrically driven pump transmitting hydraulic fluid to a jack, acting directly or indirectly on the car (multiple motors, pumps and/or jacks may be used).

Indirect acting lift : A hydraulic lift where the ram or cylinder is connected to the car or the car sling bysuspension means (ropes, chains).

Instantaneous safety gear : A safety gear in which the full gripping action on the guide rails is almost immediate.

Instantaneous safety gear with buffered : A safety gear in which the full gripping action on the guide rails is almost immediate, but the reaction on the car or balancing weight is limited by presence of an intermediate buffering system.

Jack : A combination of a cylinder and a ram forming a hydraulic actuated the unit.

Laminated glass : An assembly of 2 or more glass layers, each of which is bonded together using a plastic film

Leveling : An operation, which improves the accuracy of stopping at landings.

Lift machine : The unit, which drives and stops the lift, comprising the pump, pumps motor and control valves.

Machine room : A room in which machine or machines and/or the associated equipment are placed.

Minimum breaking load of a rope : The product of the square of the nominal diameter of the rope (in square millimeters) and the nominal tensile strength of the wires (in Newton’s per square millimeter) and a coefficient appropriate to the type of rope construction.

Non-return valve : A valve, which allows free flow in one direction only.

One-way restrictor : A valve, which allows free flow in one direction and restricted flow in the other direction.

Over-speed governor : A device which, when the lift attains a predetermined speed, causes the lift to stop, and if necessary causes the safety gear to be applied.

Passenger : Any person transported by a lift in the car.

Pawl device : A mechanical device for stopping involuntary descent of the car, and maintaining it stationary on fixed supports.

Pit : The part of the well situated below the lowest landing served by the car.

Pressure relief valve : A valve, which limits the pressure to a pre-determined value by exhausting fluid.

Progressive safety gear : A safety gear in which retardation is effected by a braking action on the guide rails and for which special provisions are made so as to limit the forces on the car or balancing weight to a permissible value.

Pulley room : A room not containing the machine, in which pulleys are located, and in which the over speed governor and the electrical equipment can also be housed.

Rated load : The load for which the equipment has been built.

Rated speed : The speed v in meters per second of the car for which the equipment has been built: Vm = rated speed upwards in meters per second, Vd = rated speed downwards in meters per second, Vs = the higher value of both rated speeds Vm and Vd in meters per second.

Re-leveling : An operation, after the lift has stopped, to permit the stopping position to be corrected during loading or unloading, if necessary by successive movements (automatic or inching).

Restrictor : A valve in which, the inlet and outlet are connected through a restricted passage way.

Rupture valve : A valve designed to close automatically when the pressure drop across the valve, caused by the increased flow in a predetermined flow direction, exceeds a pre-set amount.

Safety gear : A mechanical device for stopping, and maintaining stationary on the guide rails, the lift car or balancing weight in case of over speeding in the downward direction or breaking of the suspension.

Safety rope : An auxiliary rope attached to the car and the balancing weight for the purpose of tripping a safety gear in case of suspension failure.

“Shut-off” valve : A manually operated two-way valve, which can permit or prevent flow in either direction.

Single acting jack : Jack in which displacement in one direction is by fluid action and in the other by influence of gravity.

Sling : The metal framework carrying the car or balancing weight, connected to the means of suspension. This sling can be integralwith the car enclosure.

Traveling cable : Flexible cable between the car and a fixed point.

Unlocking zone : A zone extending, above and below the stopping level, in which the car floor must be enable the corresponding landing door to be unlocked.

Well : The space in which the car and the balancing weight, if there is one, travels. This space is usually bounded by the bottom of the pit the walls and the ceiling of the well.