Linkages are multiple levers (called links) connected together via fixed or movable joints, both to transform motion and to apply mechanical advantage.
Crank & Slider (Slider-Crank Linkage)
A crank and slider is a type of linkage involving a fixed joint attached to a moving wheel (the crank), the joint is connected to a rod that moves (the slider). As such a crank-slider linkage can also be used to convert rotary motion to reciprocating motion, similar to the Cam & Follower
Bell Cranks
A type of linkage that changes the direction of a linear or reciprocating motion:
