Article 34 -Escalator Comb Dimensions and Safety Requirements
Escalator Comb Dimensions and Safety Requirements
Combs are toothed parts at both landings, fixed on the comb plate and mesh with the grooves of the step or pallet surface and are used to ensure safety of the passenger by prevention of trapping and pinching in the gaps between the tread surface of the step and the comb plate.
To reduce the risk of trapping or pinching of passenger toes, the ends of the combs must be rounded off in way that when the passenger foot reaches the comb, it should not be trapped by the combs and slide over to the landing plate area.
The combs must be designed in such a way that when small foreign objects such as gravel become trapped between the grooves of step or pallet tread surface and comb teeth, they must be detected or the comb teeth must break. In case of trapping and non-deflection, the comb plate moves back and activate the installed safety device behind the comb plate and causes device to stop.
The angle of the rounded combs must not be more than 35 degree.
The radius of the teeth ends must not be more than 2 mm.
The width of each teeth must be 2.5 up to 5.0 mm.
The comb plate must be adjustable to allow correct meshing with the grooves of step or pallet tread surface.
The comb teeth must mesh with the grooves of the step or pallet surface at the minimum depth of 4 mm and the rest of comb teeth, above the meshing must not be more than 4 mm from the step surface.
Note: As mentioned above the combs are fixed on the comb plate and their design must be in a way that eases out their replacement.