ELEVATOR MEUTI230 QUIZ

ANNUNCIATOR

ANNUNCIATOR

an electrical device that indicates usually by lights, the floor at which an elevator landing signal has been registered.

BUFFER

a device for stopping a descending car or counterweight beyond its bottom terminal by absorbing and dissipating the kinetic energy of the car or counterweight.

BUMPER

a device other than buffer for stopping a descending car or counterweight beyond its bottom terminal by absorbing the impact.

CAR

the load carrying element of an elevator, including platform, car frame, enclosure, and car door or gate.

CAR DOOR ELECTRIC CONTACT

an electrical device for preventing normal operation of the driving machine unless the car door or gate is closed

CAR FRAME

the supporting frame to which the car platform, guide shoes, car safety, and hoisting ropes or hoisting-rope sheaves, or the plunger of a hydraulic elevator are attached.

CAR PLATFORM

the structure on which the car and its floor are mounted

CAR SWITCH

a manual operating device in a car by which an operator actuates the control.

CONTROL

the system governing the starting, stopping, direction of motion, acceleration, speed and retardation of the car.

EMERGENCY STOP SWITCH

a car located device that, when operated manually causes the car to be stopped by disconnecting electric power from the driving machine motor.

HOISTWAY

a shaft for travel of one or more elevators. It extends from the bottom of the pit to the underside of the overhead machine room or the roof.

LEVELLING DEVICE

, a mechanism for moving a car that is within a short distance of a landing toward the landing and stopping the car there.

DRIVING MACHINE

the power unit for raising and lowering and elevator car.

OPERATING DEVICE

the car switch, push button, lever, or other manual device used to actuate the control.

PIT

portion of a hoistway below the lowest landing

SAFETY

a mechanical device attached to the counterweight or to the car frame or an auxiliary frame to stop or hold the counterweight or the car, whichever undergoes overspeed or free fall, or if the hoisting ropes should slacken

TERMINAL SPEED LIMITING DEVICE

a device for reducing automatically the speed of a car approaching a terminal landing, independently of the car operating device and the normal terminal stopping device if the latter should fail to slow the car as intended.

TRAVELLING CABLE

a cable containing electrical conductors for providing electrical connections between a car and a fixed outlet in a hoistway

HOISTWAY ENCLOSURE

The code requires that hoistways be enclosed throughout their height with fire resistant construction, except for cases where no solid floors are penetrated. The enclosure should have a 2 hr fire rating, and hoistway door and other opening protective assemblies should have a 1 ½ rating. Where fire resistant construction is not required, laminated-glass curtain walls or unperforated metal, such as 18 ga sheet steel, should enclose the hoistway to a height of 8ft above each floor and that level, if openings are less than 2 in wide or high.

VENTING OF HOISTWAY

In significant high-rise building fires, the elevator hoistways have served as a flue for smoke and hot gases generated by fire. The prevailing thought has been that hoistway venting means could minimize the spread of smoke and hot gases through out the building. As more has been learned about smoke movement in high rise, many alternatives have been developed to prevent migration of smoke from the fire floor to noninvolved floors of the structures. Among these alternatives are various systems, for hoistway pressurization and mechanical pressure sandwich systems, where building ventilating units are used to contain smoke during a fire.

MACHINE ROOM

Construction of enclosures of spaces containing machines, control equipment, and sheaves should be equivalent to that used for the hoistway enclosure. To dissipate machinery heat and to preserve computerized elevator control equipment, the spaces must be air conditioned.

GUIDE RAILS

The path of elevator cars and of counterweight, if used, are controlled by vertical guide rails installed in the hoistway. The rails are T shaped in cross section and have smooth guiding surfaces along which the car wheels roll.

BUFFERS AND BUMPERS

Energy absorbing devices are required at the bottom of a hoistway to absorb the impact from a car that descends below its normal limit of travel.

ELEVATOR CARS

A ______ consist basically of a platform for transporting passengers and goods. The platform is raised or lowered by wire ropes or a hydraulic piston or plunger. The ______ is required to be completely enclosed. ______ enclosures of sheet metal or plywood are common; some decorative elevator are enclosed in laminated glass. To provide access to the ______, openings protected by doors are provided in one or two of the _____ walls.

COUNTERWEIGHT

Power requirements of the driving machine for moving the car are reduced by hanging a counterweight on the hoisting ropes. Use of a _____ also is advantageous fro maintaining traction between the hoisting ropes and the driving sheave. The weight of the ________ usually is made equal to the weight of the unloaded car and the ropes plus about 40% of the rated load capacity of the car.

steel frame

A counterweight usually is made up of cut steel plates set in a ________.