Link 1 is connected by a screw pair to three-armed member 4 and passes freely through hole a in clamp 2. Workpiece 6 is clamped against a stationary surface (not shown in the drawing) by clamp 2, sliding along cylindrical columns 3 when member 1 is turned (screwed in). Three-armed member 4 is held by heads 5 of columns 3 and can be quickly removed by turning it counterclockwise about screw 1 (fixed axis A ).
$211$SL,GC$