Glossary of Terms : F - J


Faceplate

The decorative cover which houses control devices such as position indicators, pushbuttons, key switches, etc.

Feedback

The transmission of current or voltage from the output of a circuit or device back to the input, where it interacts with the input signal to modify the operation of the circuit or device.

Fire fighting Lift

An option where one nominated lift is allowed to be removed from normal group service for firemen's use.

Fishplate

A steel plate, which spans the joint where two lengths of guide rails meet.

Floor Selector

A mechanical, electrical, or microprocessor driven device which initiates and/or controls some or all of these functions: establish direction of travel, acceleration, deceleration, levelling, stopping, call cancellation, door operation, position indicators, and hall lanterns for an individual Lift.

Full Speed

The contract speed at which the lift should run.

Gear

A toothed wheel designed to mesh or engage with another wheel or part for transmitting or changing motion.

Geared Traction Machine

A traction machine in which the power from the motor is transmitted to the drive sheave through reduction gears.

Gearless Traction Machine

A type of lift hoisting machine on which the hoist ropes pass over a traction drive sheave, which is an integral part of the armature. Called gearless because no geared reduction unit is utilized.

Generator

An electromechanical device that converts mechanical energy to electrical energy (usually direct current).

Governor

A mechanical speed control mechanism. For Lift, it is a wire rope driven centrifugal device used to stop and hold the movement of its driving rope. This initiates the activation of the lift car safety device. It opens a switch, which cuts off power to the drive motor and brake if the lift car travels at a pressed overspeed in the down direction. Some types of governors will also open the governor switch and cut off power to the drive motor and brake if the lift car overspeeds in the up direction.

Governor Rope

A wire rope attached to a lift car frame that drives the governor and, when stopped by the governor, initiates setting of the car safety.

Goods Lift

A lift equipped to carry goods, forklift trucks etc.

Goods passenger Lift

A lift mainly intended for the transport of goods, which are generally accompanied by persons.

Groove

"Vee" - A groove in the drive sheave which produces a pinching or wedging effect on the cable, used on gearless machines. "U" - A groove in the drive sheave, which relies on friction between groove and cable, used on gearless machines.

Group Control System

A system that controls two or more lifts by governing assignments in response to hall calls. Also controls zoning, peak traffic demands and parking.

Guide rail

Steel sections with smooth guiding surfaces. The section profile is usually T shaped (machined, cold drawn or roll moulded). Guide rails are installed in a lift shaft to guide and direct the travel of an lift car and its counterweight.

Guide Shoes

(1) Devices used mainly to guide the car and counterweight along the path of the guide rails. They also assure that the lateral motion of the car and counterweight is kept at a minimum as they travel along the guide rails. (2) Guiding projections mounted on the bottom edge of horizontally sliding doors or gates, or on the sides of vertically sliding doors or gates to guide them.

Hall Call

A call registered at a landing button or fixture.

Hall Lantern

A corridor mounted signal light indicating that an elevator car is approaching that landing and the direction in which the car is to travel.

Hall Station

Device located in hall usually near the elevator to be used when calling the elevator to that floor.

Hanger Rollers

Rollers (two per panel) from which horizontal door panels are suspended.

Handrail

A hand hold support in a lift car.

Headroom

Part of the lift shaft between the topmost finished floor level and the ceiling of the shaft.

Hitch Plate

A metal plate clamped to the underside of the crosshead and to which the shackles are attached.

Hoist Rope

The wire ropes used to raise and lower an lift car.

Hoistway

The space enclosed by fireproof walls and lift doors for the travel of one or more lifts, dumbwaiters or material lifts. It includes the pit and terminates at the underside of the overhead machinery space floor, or at the underside of the roof where the hoistway does not penetrate the roof.

Hoistway Enclosure

The fixed structure, consisting of vertical walls or partitions, which isolates the hoistway from all other areas or from an adjacent hoistway, and in which the hoistway doors and door assemblies are installed.

Hydraulic Lift

Hydraulic lift where the energy is applied, by means of a liquid under pressure, in a cylinder equipped with a plunger or piston.

Hydraulic Valve

In the construction of hydraulic lifts, a valve used to regulate the flow of the fluid used to raise and lower the lift, usually a low viscosity oil.

Induction Motor

An AC motor having two parts: a rotor and a stator. The stator creates a rotating magnetic field, that induces a voltage into the rotor causing it to rotate.

Interlock

A device having two related and interdependent functions which are:

(1) to prevent the operation of the driving machine by the normal operating device unless the hoistway door is locked in the closed position. An electro-mechanical device that prevents operation of an lift unless the hoistway doors are in the closed and locked position;

(2) to prevent opening of a hoistway door from the landing side unless the lift is in the landing zone and is either stopped or being stopped.

Intermediate Landing

Any landing served by a lift between its upper and lower terminal landings.

Jack

The device which pushes the hydraulic lift.