Links 3 and 3' slide along stationary guide surface p-p and are connected by screw pairs A and A' to link 4 which, in turn, is connected by turning pair B to the fixed base. Lever cams 2 and 2' turn about fixed axes D and D' and, with their straight portion d, contact the profiled ends of links 3 and 3'. Workpiece 1 is clamped by lever cams 2 and 2' which are turned by the action of cam links 3 and 3', having L.H. and R.H. threads and travelling towards each other when link 4 is turned clockwise.
$215$SL,GC$