Which of the following are the two types of step chains found on escalators?

The correct identification of the two types of step chains found on escalators relates to the structural design and functionality of the step chains themselves. The distinction between axled and non-axled step chains is crucial for understanding how escalators are assembled and operate.

Axled step chains are designed with axles that connect to the steps of the escalator, providing stability and support. These chains are integral to ensuring that the steps remain aligned and correctly positioned as they move up and down the escalator. The axles allow for a more robust connection, enhancing the durability and reliability of the escalator's performance.

On the other hand, non-axled step chains do not feature this rigid axle connection. Instead, they typically rely on different mechanisms to maintain step integrity and movement. This flexibility can sometimes offer advantages in specific escalator designs or applications but may involve trade-offs regarding stability and reliability.

Understanding these two types of step chains helps in recognizing their roles in escalator operations, maintenance, and safety protocols, which are critical for anyone involved in escalator installation or servicing.