Cam 1 turns about fixed axis A and its working surface a slides along flat surface e of clamping plunger 2 which slides in fixed guide b. When handle c is turned counterclockwise, workpiece 3 is clamped against fixed surface d. When handle c is turned clockwise, spring 4 forces lunger 2 to the right, releasing workpiece 3.
$3150$SmC,GC$