Striker 2, suspended on wire rope 4 running over pulley 1, slides downward in guides and its pin a strikes two-armed lever 3. This lever turns about fixed axis A, frees pin b and head 6 drops. Flat spring 5 returns lever 3 to its initial position. Bevelled surface c of lever 3 enables the lever to catch pin b when head 6 is raised.
$480$SL,HP$