Abstract: Apparatus and a method for injection molding large container lids of the type having threads for screwing the lids onto and off large containers. The apparatus includes an injection mold having a cavity mold portion and a core mold portion which together define the shape of the lid. The core mold portion includes a stationary annular ring that defines the lid threads. A co-axial, rotatable center section of the core mold portion is opened to spin the molded lid off the core mold portion and release it from the mold.

Abstract: An adjustable clamping or locking wedge is disclosed for use in an injection mold press. The clamping wedge has a main body portion with a main oblique wedging surface adapted to be engaged by a moving portion of a closing mold. The main body portion has a second oblique wedging surface located transversely of the main oblique wedging surface. A wedge is located for sliding engagement against the second wedging surface and supports the main body portion, and a threaded fastener is mounted between the main body portion and the wedge for moving the wedge and adjusting the position of the main oblique wedging surface in the mold press.