Parts of a Fire Department Ladder

Written by michael montecalvo
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Parts of a Fire Department Ladder
Ladders are an essential tool in fire brigade operations. (Thinkstock/Comstock/Getty Images)

Stepladders, extension ladders, aerial ladders, roof ladders and combination ladders are some of the different types of ladders firefighters use to do their job. Regardless of the type, ladders are intended to do one thing: extend a firefighter's reach. Even though many types of ladders may be used, many of their parts are the same. The 24-foot extension ladder is the standard ladder found on most pumpers.

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Beam and Rungs

The side rails of a ladder are called beams. They provide the basic structure and support of the ladder. The beams are constructed of wood, aluminium or fibreglass. For a standard two section ladder, the beam may be 4 inches wide, but this depends on the material used and the manufacturer. The rungs are the horizontal cross members that connect the beams and where the feet are placed for climbing. Rungs must be a minimum of 1 1/4 inches in diameter.

Parts of a Fire Department Ladder
Ladder rails or beams give structure and support. (Jupiterimages/Photos.com/Getty Images)

Base and Fly

There are two principle parts to any extension ladder: the base and the fly. The base or bed is the bottom section. The base is wider, more heavily constructed and it holds the fly section of the ladder.

The fly is the smaller upper section of the ladder. It is the part that extends or is raised to give the ladder its height. All other parts attach to either of these sections.

Parts of a Fire Department Ladder
The base and fly are the two main sections of any extension ladder. (Nick Daly/Digital Vision/Getty Images)

Pulley and Halyard

The pulley and halyard, or rope, are used to raise the fly section of the ladder. The pulley is attached to an upper rang on the fly and the halyard is attached to a lower rang on the fly. To raise the fly section, a person stands behind the ladder, pulls the rope downward and the fly goes up. This is usually a two person task.

Parts of a Fire Department Ladder
The pulley and halyard are used to raise the fly section of a ladder. (David McNew/Getty Images News/Getty Images)

Stops and Pawls

Stops are made of steel, and a set is applied to each section of the ladder at predetermined points. The stops prevent the fly from being raised too high and compromising the strength of the extended ladder. Pawls, or dogs, are the structured metal pieces attached to the inside of the beams on the fly section. When the fly is raised, the pawls fit over the rungs of the base to secure it in place.

Parts of a Fire Department Ladder
Stops prevent the fly from being raised too far. (Joe Raedle/Getty Images News/Getty Images)

Hooks

The hooks are large spring-loaded devices that are located at the tip of each beam. The spring mechanism allows for the hooks to be locked into place in either their storage or deployed position. These hooks, when deployed, can secure the ladder over the peak of a roof or in a window opening giving a firefighter one more tool in a dangerous situation.

Parts of a Fire Department Ladder
Hooks in the stored position. (Jupiterimages/Photos.com/Getty Images)

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