Patent ID: 6932234

Claim:
A cup-shaped receptacle of paper or cardboard, provided with a plastic material clip-on lid; the receptacle having an opening area delimited by an upwardly and outwardly tapering conical receptacle wall and an outwardly projecting bead; the lid having a peripheral clamping groove which is open on a lower surface of the lid for receiving therein the bead; the clamping groove having at an outer lower end region an elastically expandable constriction, and at the inner side of a top wall a cylindrical or conical outer surface of an outer leg wall of a circuinferentially extending lid recess of U-shaped cross-section; a U-web of the lid recess being located below the height position of the constriction; an inner leg wall of the lid recess being part of a dome wall of a dome having a dome top wall located above the constriction and the clamping groove, respectively; the lid recess having such a depth to markedly extend downwards beyond the height position of the constriction by a length which is equal to at least 2.5 times the height of the clamping groove, and an outer diameter at the outer surface at the elevation of the constriction largely corresponding to the inner diameter of the receptacle wall at the bead; and in the clamping groove the outer diameter of the outer surface at the transition from the top wall into the outer surface being markedly larger than the interior diameter of the receptacle wall in the opening area, such that during a clip-on operation of the lid, the lid recess outer surface functions as a lid centering and guide projection cooperating by sliding contact with the receptacle wall when the bead reaches the constriction while downwardly directed clip-on pressure mainly is applied to the dome.