What are mechanical locking devices at the end of a beam on a fly section of a ladder called?

Mechanical locking devices at the end of a beam on a fly section of a ladder are referred to as "dogs." The primary function of dogs is to secure the various sections of a ladder in place when it is extended, ensuring stability and safety while the ladder is in use. When deployed, these locking devices engage and latch, preventing the sections from sliding against one another, which is crucial when a firefighter is climbing or working at height.

Understanding this terminology is essential for firefighters, as proper knowledge of ladder parts and their functions enhances safety and efficacy in emergency situations. The other terms mentioned, such as clamps, stops, and hinges, describe different ladder components or functionalities but do not refer specifically to the locking mechanisms used in fly sections of ladders. This distinction is important for recognizing how ladders should be properly deployed and utilized.