Rocker arm 2 of four-bar linkage ABCD has cam surface a-a of special shape along which point b of pusher 3 slides. Pusher 3 reciprocates in fixed guide c. When crank 1 rotates about fixed axis A, cam 2 reciprocates pusher 3 in the vertical direction. Pusher 3 is held in contact with profiled surface a-a by means of a spring which is not shown.
$1691$LC,5L$