NEIEP Mechanics Practice Exam

As a step moves from the upper track to the upper curve, what is used to protect the step chain rollers from excessive load?

1. Guard plate

2. Transition board

3. Support bracket

4. Roller guide

The correct answer is: Transition board

The transition board serves a crucial role in protecting the step chain rollers as they move from the upper track to the upper curve. Its primary function is to provide a smooth change in direction for the motion of the step chain, effectively reducing the risk of excessive load on the rollers during this transition. By facilitating a gradual shift, the transition board minimizes abrupt changes in speed and direction that could lead to mechanical stress on the step chain components. Consequently, the use of a transition board ensures greater durability and reliability of the escalator system, contributing to its overall safety and efficiency. Other options, while they may have their uses in an escalator system, do not specifically address the need for a protective measure during the transition of the step chain rollers at this critical point.