Circular eccentric 1 is connected by turning pair A to rocker arm 4 which oscillates about fixed axis B. Pulley 5 rotates about axis B and transmits rotation through flexible link 3 to pulley 6 of equal diameter which is rigidly attached to eccentric 1. When eccentric 1 rotates, it moves up and down in chamber 2, serving as a piston in a cylinder.
$3848$LHP,RP$