What type of linkage consists of a driver arm, connecting rod, and a follower?

In the context of mechanical linkages, a system that includes a driver arm, connecting rod, and a follower describes a configuration that allows for the transfer of motion in a specific manner. The double rocker linkage is characterized by having two rockers that oscillate around fixed points, providing continuous motion transfer through a combination of these components.

In this type of assembly, the driver arm serves as the input mechanism, the connecting rod translates that input into movement, and the follower responds to the oscillation of the connected elements. This configuration is often utilized in applications where a consistent output motion is required as the driver arm moves in a circular path, transmitting that motion through the connecting rod to the follower.

In contrast, the single rocker system would consist of only one rocking component, which does not allow for the same degree of complexity or outputs as the double rocker. Each of the other linkages, such as the slider crank and crank rocker, are designed for specific motion profiles and therefore do not match the description involving both a driver arm and a follower in the same manner as the double rocker does.

Thus, the correct answer is the double rocker, as it accurately reflects the combination of components working together to create a functional mechanical system.