EscalatorsEscalators

Instructor: Raja Veerendra Yenigalla

� Introduction

� Essential Requirements

� Essential where ”movement of people in large numbers at a controlled rate in minimum space involved”

� Recommended handling capacities:

� 3200 – 6400 persons per hour (Depending on the width of escalator)

� Theoretical Capacity =

3600 * (Rated speed in m/s) * k/0.4

K = 1 for 0.6m step width (1 person)K = 1 for 0.6m step width (1 person)

= 1.5 for 0.8m step width (1.5 persons)

= 2 for 1.0 m step width (2 persons)

� Angle of Inclination

� < 30 (Measured from the horizontal)

� For rises < 6m and speed < 0.5m/s;

�Angle of inclination = 35 °

� Rated Speed of Escalator

� < 0.75 m/s for angle of inclination up to 30to 30

� 0.5 m/s for angle between 30 - 35 °

� Horizontal Distance between interior panels of balustrade at bottom should be equal or less than horz. Distance at top

� Parts of balustrade facing the interior should be smooth

� Covers should be rigid and have rounded edges

� Covers or strips not in direction of travel should not project more than 3 mm

� Cover joints in direction of travel shall be � Cover joints in direction of travel shall be arranged so that the risk of trapping is minimum

� Gap between the interior panels of balustrade should be less than 4 mm

� Balustrade interior panel should have sufficient strength and there should not be permanent deformation

� Glass can be used for interior paneling of balustrade provided

�Glass is splinter free

�Has sufficient strength

� Thickness > 6mm

� Should not be abrupt changes in the width between the balustrades on two sides

� Horizontal clearance between the skirting and � Horizontal clearance between the skirting and steps should not be more than 4mm on one side and 7mm measured at both sides.

� Hand Rails

�Should move in same direction as steps

and with same speed

�Width : 70 – 120 mm

�Should extend beyond 300mm of comb

plate teeth in both upper and lower

landings

� Step Treads

� Step depth in direction of travel >= 0.38m

� Should have grooves in direction of

movement which mesh with teeth of the

combs

�Width of grooves : 5 -7 mm

�Depth of grooves < 10mm

� Landings

� Surface providing secure foot hold for a min distance

of 0.85m from the root of the comb teeth.

Comb plates� Comb plates

� Provided at the entrance and exit of every escalator

� Comb plate teeth should always be below the upper

surface of the treads.

� Trusses and Girders

� Step Wheel Tracks

� Driving Machine, Motor and Brake

� Speed Governors