The Knuckle Boom Crane
Also called the loader crane or the articulating crane, the knuckle boom crane has changed the way people load and offload in a variety of industries. It looks similar to the traditional straight boom crane, but the knuckle boom crane has two booms; a main boom and an outer boom. These two booms have a knuckle between them, which allows more options for the operator.
Look at your fingers; hold your index finger out straight, and then bend your finger at the knuckles. The knuckle boom crane works in the same manner. The addition of these two knuckles on the crane allows for many more different uses compared to a straight boom crane. These knuckles also make it easier to fold into a smaller size, but at the same time it can extend further to reach loads at a distance. This kind of “fold and extend” ability is missing in the traditional stiff boom cranes.