Link 1 is connected by a screw pair to member 2 which slides in a hole in the base. Link 1 has pin b enclosed by cover nut 4 which is screwed onto a connection of the base. The nut has slots a through which pin b can pass along axis x-x. To clamp workpiece 3, link 1 is first pushed into nut 4, pin b passing through slots a, and then turned (screwed out). To release the workpiece, link 1 is first turned (screwed in) and then pulled out of nut 4. The position of clamping member 2 is adjusted by nut 4 and its round locknut.
$212$SL,GC$