Second inversion of Four Bar Chain
Beam Engine (Crank and Rocker (Lever) Mechanism):
A part of the mechanism of a beam engine (also known as crank and lever mechanism) which consists of four links, is shown in Fig.
In this mechanism, when the crank rotates about the fixed centre A, the lever oscillates about a fixed centre D.
The end E of the lever CDE is connected to a piston rod which reciprocates due to the rotation of the crank.
In other words, the purpose of this mechanism is to convert rotary motion into reciprocating motion.
