ESCALATOR MEUTI230 QUIZ

ESCALATORS

ESCALATORS

_________, or powered stairs, are used when it is necessary to move large numbers of people from floor to floor. They provide continuous movement of persons and can thus remedy traffic condition that are not readily addressed by elevators.

ESCALATORS

_______ should be viewed as preferred transportation systems whenever heavy traffic volumes are expected between relatively few floor.

ESCALATORS

used to connect airport terminals, parking garages, sports facilities, shopping malls, and numerous mixed use facilities.

Powered Ramp

has a continuous treadway for carrying passengers.

ESCALATORS

consists or articulated, grooved treads and risers attached to a continuous chain moved by a driving machine and supported by a steel truss framework.

The Installation of Powered Stairs

should conform with the requirements of the American National Standard Safety Code for Elevator, Dumbwaiters, Escalator and Moving Walks.

Plates

The ______ are equipped with a comb, or teeth, that mesh with and are set into the grooves in the treadway in the direction of travel, so as to provide firm footing and to minimize the chance that items become trapped between treadway and the landing.

nandrail

The _____, which move in synchronization with the steps, should be between 30 and 34 above the treads. The ______ should extend at normal height at least 12 in beyond the line of points of the combplates teeth.

tread and riser assembly

The _______ is either a single die-cast piece or is assembled to a frame.

step rollers

The ______ ride on a set of tracks attached to the trussed framework.

tracks

The ____ are shaped to allow the step tread to remain horizontal throughout its exposed travel.

15 ¾ in

Minimum depth of tread in direction of travel

8 ½ in ½

Maximum rise between treads

24 in

Minimum width of tread

40 in

Maximum width of tread

3/8 in

Maximum clearance between tread and adjacent skirt panel

width between balustrades + 6 in

Maximum distance between handrail centerlines with not more than 3 in on either side of the escalator.

The _________ carrying the handrails and acting as a guard to prevent passengers from falling off the sides of the moving steps should be designed to resist simultaneous application of horizontal load of 40 lb/ft and a vertical load of 50 lb/ft, both applied to the top of the __________.

brake

The ______ is activated automatically when a power failure occurs, when the treadway or a handrail breaks, or when a safety device is activated.

right hand

An emergency stop button, protected against accidental activation, is required to be set in the ______.

90 or 120

Escalator typically operate at ______ ft/min, as needed for peak traffic, and are reversible in direction.

30 deg and 35 deg

Slope of the stairs is standardized at __________ are used in other parts of the world.

32 and 48 in

Standard escalator width are _______.

5000 and 8000

Manufacturers rate their 90 ft/min units at corresponding capacities of ________ person per hour, although observed capacities, even in heavy traffic, rarely exceed 2000 and 4000 persons per hour, respectively.

2000 and 4000

Manufacturers rate their 90 ft/min units at corresponding capacities of 5000 and 8000 person per hour, although observed capacities, even in heavy traffic, rarely exceed _______ persons per hour, respectively

alternative transportation

Since escalators are devices that will fail on occasion, the designer must provide ________ (usually adjacent stairs) for times when the escalator is unavailable for passenger use.

20

Generally for floor to floor heights of less than ___ ft, the escalator truss need be supported only at top and bottom.

PARALLEL ARRANGEMENT

CRISSCROSSED ARRANGEMENT

Crisscrossed stairs

________ generally are preferred because they are more compact, reducing walking distance between stairs at various floor to a minimum.

SPRINKLER VENT METHOD

a combination of automatic fire or smoke detection system, automatic air exhaust system, and an automatic water curtain.

SPRAY NOZZLE METHOD

a combination of an automatic fire or smoke detection system and a system of high velocity water spray nozzles.

ROLLING SHUTTER METHOD

in which an automatic, self closing, rolling shutter is used to enclose completely the top of each escalator.

PARTIAL ENCLOSURE METHOD

in which kiosks, with self closing fire doors, provide an effective barrier to spread of smoke between floors.