an automatic lance changeover device is presented wherein a radially guided ring is axially vertically displaceable by two lifting spindle systems provided on each side of the ring and bears pivotable hooks for receiving the lance and for pressing the latter axially against a sealing surface on the coupling head . the hooks are connected to the stationary coupling head via pivotable connecting rods whose length is alterable , these connecting rods being eccentrically articulated on the support pin of the hooks with the bearing bore at the coupling head end of the connecting rods having a larger diameter than the associated wrist pin . when the ring is axially displaced , the hooks , which have swung out , in a first phase , initially surround the supporting pins on the upper part of the lance as the ring is displaced further , the hooks , without executing any further pivoting movement , pull the lance head into sealing contact with the coupling head .