what are linkages used for
Linkages. Linkages are mechanisms which allow force or motion to be directed where it is needed. Linkages can be used to change: 1  The direction of motion. 2  The type of motion.3  The size of a force.readle linkage. A treadle linkage shows how linkages can be used to change one type of motion into another. In this case, the rotary motion of the cam moves a parallel-motion linkage.