Nut 1 is connected by a screw pair to stud a which is screwed tightly into the fixed link (base). Lever (shaped clamp) 2 is mounted freely on stud a and has slot b that slides along on pin c. Considerable clearance is provided between bolt a and lever 2. Lever (clamp) 2 has hooked end d which clamps shoulder e of workpiece 3. Workpiece 3 is clamped by lever 2 when nut 1 is tightened. When nut 1 is released, spring 4 raises lever 2 which can be pushed forward to enable workpiece 3 to be removed.
$197$SL,GC$