Abstract: A plastic container-cover assembly comprises (a) a container body having a top opening; (b) a first shoulder provided at the outside of the container close to the edge of its opening; (c) a cover for said opening; (d) an outside flange provided on said cover and extending downwardly and then at a sharp angle outwards, the outwardly pointed portion of the flange in the closed position abutting the upper side of said first container shoulder; (e) a hinge provided in proximity to the outer edge of said outwardly pointed portion of said flange; (f) at least two rigid closure flaps linked by said hinge to said flange for swinging from an open to a closed position; (g) a first ledge formed on said flap and, in the closed position, extending inwards and abutting against the bottom side of said first container shoulder; (h) a second, when closed, inwardly extending ledge formed on said flap spaced from said first ledge; (i) a second shoulder formed on the outside of said container spaced from said first shoulder, and

Abstract: A blow molded synthetic thermoplastic barrel one end wall of which has an eccentric opening surrounded be a ring-shaped mouth which, in turn, is surrounded by an arcuate groove having two open ends. The opening can be closed by a cover whose outer side is then flush with the outer surface of the major portion of the one end wall. Such outer surface is surrounded by a bead which can surround the other end wall of a second container when the two containers are stacked end-to-end. For the stacking of several containers side-by-side, the circumferential wall of the barrel has two longitudinally extending flats located diametrically opposite each other. The circular end portions of the flats extend into the domed end portions of the circumferential wall and close to the respective end walls.

Abstract: An improved extrusion apparatus for extruding a tube of soft thermoplastic material of improved consistency and homogeneity is provided. A double walled piston having an annular chamber between the inner and outer annular walls thereof is mounted for sliding longitudinal movement between the interior wall of the apparatus housing and a longitudinal core disposed in the housing. The thermoplastic material fed into the apparatus first enters the annular piston chamber which, even during upward and downward movement of the piston, remains constant.

Abstract: A cylindrical, synthetic plastic container having reinforcing hoops permanently bonded around the ends of the container is manufactured in a single blow molding process. Half of the outer peripheral edge portion of each of two reinforcing hoops is positioned in a semi-cylindrical mold half to place the hoops in spaced, parallel, co-axial alignment. Thereafter, a tube of soft thermoplastic is extruded through the open central portions of the hoops until the end of the tube overlies a co-axially positioned pneumatic nozzle. The semi-cylindrical mold half with the hoops retained therein is moved into engagement with a mating, semi-cylindrical mold half to form a cylindrical mold.

Abstract: One end wall of a molded barrel of thermoplastic material has a general plane and is provided with at least two depressions at opposite diametric sides. A tubular portion is located in each depression and .Iadd.is .Iaddend.of one piece with the end wall, each of the tubular portions communicating with the interior of the barrel and terminating in the general plane. Reinforcing webs are provided in the respective depression at that side of the associated projection which faces at the middle of the one end wall and these reinforcing webs are each of one piece with the one end wall and the respective projection, bridging the respective depression.