Abstract: The invention comprises a rectangular plastic sheet which may be folded about living hinges to provide a container for holding coins and the like. The sheet is made of polypropylene or other suitable plastic material which has good living hinge qualities in thin sections. The preferred embodiment consists of three V-shaped units separated by two living hinges, which units when folded form a regular hexagonally cross-sectioned cylinder. Ledging may be provided on the end of the sheet so that when folded the ledging at least partially closes the otherwise open ends of the cylinder. A locking mechanism comprising an upwardly extending lip on a side edge of the sheet which engages a hollow behind and beneath a downwardly extending lip on the other side edge is provided. By forcing contact by the coins against the container walls when the container is closed the material is tightened against the coins and the locking mechanism becomes more tightly engaged, securing against accidental opening.

Abstract: This invention relates to improved flow control mechanism for valve gated injection molding. The mechanism is of the type where movement of the valve pin is controlled by a pneumatically driven rocker arm. The back plate is cast with an integral pivot pin portion projecting from it and a pivot ball is fixed in a seat on the end of it. The rocker arm has a recess which receives the pivot ball for pivotal motion on the pivot pin portion of the back plate. The back plate is cast of a steel with sufficient strength and flexibility to withstand the repeated lateral loading on it due to the pivotal motion of the rocker arm, while the pivot ball is formed of a significantly harder material to avoid unacceptable wear where it is in moving contact with the rocker arm. Casting the back plate rather than machining it, enables bends in the runner passage extending through it to be smoothly curved, thus avoiding "dead spots".

Abstract: This invention relates to improved mechanism for actuating injection molding valve pins. In one embodiment, the mechanism is located between two parallel rows of valve pins located in a common plane with their driven ends adjacent the mechanism. The mechanism includes a central elongated member which is longitudinally reciprocable and two parallel elongated transversely reciprocable side members, each located between the central member and one of the rows of valve pins. Each of the side members is connected to the central member by a number of spaced pairs of pivotally connected pins and the central member is secured against transverse motion, while the side members are secured against longitudinal motion. Therefore, the side members are reciprocated transversely when the central member is reciprocated longitudinally by a hydraulic cylinder.

Abstract: This invention relates to injection molding and particularly to a melt transfer system for stack molding. According to the invention, a novel combination of known melt flow control valve units are arranged and operated to control the flow of pressurized melt from the stationary platen adjacent the molding machine to a manifold in the center moving platen. One control valve unit is located in the stationary platen in alignment with another control valve unit located in the moving platen. When the moving platen is in the closed position adjacent the stationary platen, the gates of the two control valve units abut and when the valve pins of the two control valve units are actuated to the open position, pressurized melt will flow through the gates from the stationary platen to the moving platen. The hot runner passage extends from the molding machine through the control valve unit located in the stationary platen.

Abstract: This invention relates to an improved valve pin for a valve gating injection molding system. Heat transfer to the gate area is extremely critical in valve gating systems and this is even more so when new high density glass filled materials are being molded. Thus it is necessary to provide substantially increased and more uniform heat transfer to the gate area. Accordingly, the invention provides an improved valve pin having at least a portion of the valve pin adjacent the tip end being formed of an elongated hollow sealed tube which contains a vaporizable fluid under a partial vacuum. The back end of the tube receives heat from the surrounding heater cast to vaporize the fluid in the area. The vapor pressure establishes circulation of the vapor towards the cooler tip end of the tube. The energy required to evaporate a liquid is the latent heat of vaporization and this energy is released by the vapor when it condenses upon encountering a cooler portion of the tube as it moves towards the tip end.