A double rocker linkage is classified as which type of linkage?

A double rocker linkage consists of four distinct links connected by rotary joints, making it a type of four-bar linkage. This system includes two fixed points, two movable links (the rockers), and a coupler that allows for movement while interacting with the input and output members.

In a double rocker mechanism, both ground connections and the two rockers oscillate, creating a unique motion that is valuable in various mechanical applications. The four-bar linkage is a fundamental element in mechanical design and kinematics, and its classification is based on the number of links and joints it contains. Each of the other options refers to different configurations that do not apply to a double rocker configuration—thus reinforcing the classification of a double rocker linkage as a four-bar linkage.