Abstract: A conventional injection mold of the type having two half parts, and slides connected to core parts which slide inwardly and outwardly as the mold half parts open and close, have mounted therein slide retainers which lock the slides in position with respect to a slide plate in one of the mold half parts when the mold halves are fully opened. The retainers include a latch portion mounted to the slide and having a camming surface facing away from the core of the mold and a V-shaped notch therein, and a slide lock mounted below the surface of the slide plate and having a plunger with a head which extends upwardly above the flat surface of the slide plate. The head of the plunger is formed in a V-shape to match the V-shaped notch of the latch and is spring biased upwardly to provide a firm engagement between the plunger head and the latch when the slide is in the fully opened position. A stack of bowed, spring loaded washers may be utilized to apply the spring bias against the plunger to drive it upwardly.

Abstract: A locking ring for use in an injection molding machine and for securing a sprue bushing in place with respect to a mold plate assembly such that the sprue bushing is retained in place with respect to movement in the direction of the longitudinal axis of the sprue bushing bore, and from rotating in the bore.