<p>The rapid clamp system (50) has a clamp opening (12) and a piston (18) tensed by a spring at one end. A setting unit (60) follows the piston movements, with at least one clamp slide (32) and an angled guide (52) for movement in both directions to lock and release a clamp bolt (14). The angled guide has an irregular guide contour (54) with different angles in relation to the piston axis (28) to give different reduction ratios.</p>
