Abstract: A two-stage ejection system for an injection mold that allows the mold plates to move at the same time and then allows selected plates to be stopped in a locked position while the other plates continue to move. The system includes an external bushing, an internal bushing that carries cam retainers, and an ejector pin. The system may be used in an injection mold having in sequence a stationary plate, a stripper plate, a support plate and an ejection plate. The external bushing is secured to the support plate, the internal bushing is secured to the stripper plate, and the ejector pin is secured to the ejection plate. The cam retainers selectively engage grooves in the external bushing or ejector pin to lock their respective attached plates from moving with respect to each other while the other plates continue to move.

Abstract: An internal latch for an injection mold that allows opening of the mold at parting lines while selected plates are locked in position and prevented from moving. The system includes an external bushing, an internal bushing that carries cam retainers, and a locking pin. The system may be used in an injection mold having in sequence a stationary plate, a stripper plate and a support plate. The external bushing is secured to the support plate, the internal bushing is secured to the stripper plate, and the locking pin is secured to the stationary plate. The cam retainers selectively engage grooves in the external bushing to lock the stripper plate from moving with respect to the support plate when the locking pin is inserted into the internal bushing beyond the location of the cam retainers. When the locking pin is extracted from the internal bushing, the cam retainers are free to move inwardly thus unlocking the stripper plate from the support plate.

Abstract: An internal latch for an injection mold that allows opening of the mold at parting lines while selected plates are locked in position and prevented from moving. The system includes an external bushing, an internal bushing that carries cam retainers, and a locking pin. The system may be used in an injection mold having in sequence a stationary plate, a stripper plate and a support plate. The external bushing is secured to the support plate, the internal bushing is secured to the stripper plate, and the locking pin is secured to the stationary plate. The cam retainers selectively engage grooves in the external bushing to lock the stripper plate from moving with respect to the support plate when the locking pin is inserted into the internal bushing beyond the location of the cam retainers. When the locking pin is extracted from the internal bushing, the cam retainers are free to move inwardly thus unlocking the stripper plate from the support plate.

Abstract: A two-stage ejection system for an injection mold that allows the mold plates to move at the same time and then allows selected plates to be stopped in a locked position while the other plates continue to move. The system includes an external bushing, an internal bushing that carries cam retainers, and an ejector pin. The system may be used in an injection mold having in sequence a stationary plate, a stripper plate, a support plate and an ejection plate. The external bushing is secured to the support plate, the internal bushing is secured to the stripper plate, and the ejector pin is secured to the ejection plate. The cam retainers selectively engage grooves in the external bushing or ejector pin to lock their respective attached plates from moving with respect to each other while the other plates continue to move.

Abstract: A positive internal latch lock for an injection mold having outer, intermediate, and inner plates movable between open and closed mold positions. The latch lock includes a mechanism for securing the outer and intermediate plates at a predetermined spaced distance when the mold is opened at a first parting line between the outer and intermediate plates. Further, the latch lock provides a mechanism for locking the intermediate and inner plates together until the outer and intermediate plates are secured at the predetermined spaced distance. After the outer and intermediate plates are secured, the intermediate and inner plates are allowed to open at a second parting line.

Abstract: A cam slide retainer for injection molds including an elongated rounded latch groove formed in the cam slide and a corresponding lock in the core retaining plate. The slide retainer is simple to install since the body portion of the lock is circular and is installed by press fitting into the core retaining plate from the back. A shoulder on the body portion is received in a counterbore to properly position the elongated rounded lock plunger head to extend above the inside surface of the core retaining plate. A flat key surface on the shoulder properly aligns the plunger head to extend transverse to the direction of the slide movement. The elongated rounded groove in the cam slide is positioned to matingly receive the elongated rounded plunger head when the slide is moved to the position away from the molded part to releasably lock the cam slide in position.

Abstract: An angle pin assembly for use in an injection mold having a cam slide. The angle pin assembly includes a bushing and an angle pin. The bushing is received in a bore that is made perpendicular to the planar surface of a cavity retaining plate. This perpendicular bore can be made using a CNC machine so that all machining can be completed on a single machine. The bushing includes an angled bore for receiving an angle pin. The angled bore in the bushing is aligned with an angled pin receiving opening in the cam slide so that normal movement of the mold when opening and closing results in lateral movement of the cam slide away from and toward the molded part.

Abstract: A runner shut-off for an injection molding system press fit into a blind bore formed in one of the mold plates. The bore cuts through one of the runners that supplies material to the mold cavities. The runner shut-off includes a casing and a core pin rotatably received in the casing. The core pin is movable to a number of discrete rotated positions with respect to the casing. Slots are formed in the casing and the core pin to join the runners cut by the bore when the core pin is rotated to a position allowing flow of material.