2. Small Pitch Conveyor Chains
Table 2.5 Pitch and Attachment Spacing for Step (Elevator) Chain
Attachment
Pitch (mm)
Spacing
Small Size
67.7 81.3
6th 5th 4th
Medium Size
Large Size
101.6
Figure 2.10 Bearing Hole and Extended Pin on Step (Escalator) Chain
Usually rollers on the step side carry the weight of steps and passengers, but in some types the chain rollers carry the weight. The features of step chain are: (1) Greater wear resistance. The pin diameter is larger than standard chains. (2) Length from step to step and from chain to chain is strictly controlled.
Sprockets Special sprockets are required for step chains.
Technical Trends The chains shown above are being adapted for the following: (1) Lubrication-free type. (However, lubrication is mandated at regular intervals.) (2) Low-noise type (for quiet environments).
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