Fixing device for longitudinally movable cylindrical rod has hydraulic force and spring force acting on control element engaging locking plates in different positions

摘要

The fixing device for a rod (19) has locking plates (17) which can be held in the unlocked position by spring force on one side and hydraulic force on the other, acting on a control element (13) with control members (15, 16) engaging with the locking plates at different positions to set them open or closed depending on the movement of the control element.