Abstract: An attached lid container has lids that are hinged to the top edges of the side walls of the container. When the lids are closed, the free edges of the lids engage one another to form a joint that interlocks the lids together. The lids are attached to the container at the hinge joints after the molding of the container and lids, while the molded parts are still in the mold press. Specifically, the lids are molded next to the container and then moved laterally to be aligned with the hinge line of the container after the mold cavity is withdrawn. Then, the ejectors push the lids out toward the container. The force of the outward movement causes the hinge parts of the lids and container to snap together. Subsequently a robot arm removes the container from the mold press with the hinged lids assembled on the container.

Abstract: An injection mold assembly including a plurality of mold dies supported for relative movement between a mold open position and a mold closed position, each of the mold dies including a molding surface adapted to form a portion of the surface of a molded article. The mold assembly also includes a plurality of core pins for forming holes in the molded article. At least part of each of the core pins is made of a resilient, non-metallic material. The core pins are supported on one of the mold dies and are engageable with an opposed mold surface when the mold assembly is closed, such engagement resulting in the elastic deformation of the non-metallic part of the mold core pins.

Abstract: An integrally molded one-piece washing machine tub including an annular sidewall extending upwardly from a bottom wall. The sidewall diverges radially outwardly from the bottom wall and includes a plurality of drain holes recessed in vertically oriented teardrop-shaped depressions to ease separation and removal of the tub from the mold assembly.

Abstract: A mold assembly for use in an injection molding process to mold a one-piece article such as a washing machine tub. The mold assembly includes first and second relatively moveable mold plates, a mold core projecting from the first mold plate, and a plurality of mold sidewall assemblies. The mold core includes an annular outer mold surface portion which tapers inwardly to provide draft to ease the removal of the molded article from the mold assembly, and which is provided with a plurality of generally teardrop-shaped projections. Each teardrop-shaped projection converges to its narrowed end in a direction opposite the direction of removal of the article from the mold core and is configured to further ease removal of the article from the mold assembly. The mold assembly also includes a plurality of core pins mounted on the mold sidewall assemblies.

Abstract: A mold assembly having a support member which is moveable in a direction of travel both toward and away from an end plate and supporting individual mold side walls which are slideably moveable along a path of travel from a mold open to a mold closed position; and a locking member is selectively moveable into movement restraining relation relative to the individual mold side walls thereby positioning the individual mold sidewalls in the mold closed position.

Abstract: An injection mold assembly including a plurality of locking bars for securing the mold sidewalls in a mold closed position. The locking bars project from one mold plate and are positioned outwardly of the mold sidewalls and include ends adapted to engage the other mold plate when the mold is closed and to function as wedges preventing outward movement of the mold sidewalls.