Members 2 slide along a fixed guide. Bolt 5 passes freely through the hole in right-hand member 2 and is connected to the left-hand member by means of setscrew a. When nut 1 is turned (screwed on), members 2 are brought together, compressing spring 4 and clamping workpieces 3. Spring 4 returns members 2 to their initial position when nut 1 is released.
$221$SL,GC$