Nut 1 is connected by a screw pair to bolt 4 on which are mounted levers (clamps) 2. The clamps bear with one end against workpieces 3 and with the other end against buttons a. Bolt 4 has slot d by means of which it slides along the tip of setscrew b. Two workpieces 3 are clamped by levers 2 when, nut 1 is tightened. Springs 5 retract levers 2 to their initial position when nut 1 is released.
$199$SL,GC$