Workpiece 5 is clamped by member 2 when screw 1 is turned about axis x-x (screwed in). Member 2 slides along cylindrical columns 3 which serve as guides. Strap member 4 fits into slots b of two columns and serves as the nut for screw 1. The workpiece can be quickly removed by first releasing screw 1 and then turning member 4 counterclockwise.
$219$SL,GC$