Abstract: A modification of the squirrel cage of an alternating current motor reduces the starting current amperage. A conventional motor squirrel cage, which includes rotor bars and shorting rings, is modified so that the cage may have two or more controllable resistance values by segmenting the shorting rings. A high resistance cage is obtained for initial motor starting when the open segmented shorting rings provide a high resistance path within the squirrel cage circuit. Subsequent to the motor's attaining full rotation speed, a low resistance value of the squirrel cage is achieved by shunting the segmented shorting rings, which gives the motor its optimum running efficiency. In one embodiment, a mechanical means is used to accomplish the shunting of the shorting rings. In a second embodiment, a solid state control device is used to accomplish the shunting of the shorting rings.

Abstract: A purgeable plastic injection filter nozzle for trapping and eliminating contaminants from molten plastic material in a plastic injection molding apparatus. A nozzle body has an internal main channel therethrough for flow of the molten plastic. A purging hole intersects the main channel and exits the side of the nozzle body. A rotatable housing is mounted in the nozzle body at the intersection of the main channel and the purging hole. A trap is mounted in the rotatable housing for trapping contaminants in the plastic. The housing is rotatable between a first position wherein the trap is in the flow of the molten plastic, and a second position wherein the trap may be purged of contaminants through the purging hole.

Abstract: An elastomer die plug for sealing or plugging a hole in an object, such as a coolant passage in an injection molding die. The plug includes a flexible, hollow cylindrical sleeve and a core member longitudinally interengageable into the sleeve. The core member is slightly larger than the bore of the sleeve and when drawn into the sleeve expands it to fill the hole and secure the plug. The plug may be used either internally as a diverting plug or externally as a sealing plug. The inserting tool is designed to position the plug in the hole as desired, and to interengage the core member into the sleeve. The plug is inserted into the hole with the sleeve and core member separate. Then the sleeve is supported in position and the core is interengaged into the sleeve.

Abstract: A tool for effecting the sealing or plugging of a hole in an object, such as a coolant passage in an injection molding die. The plug includes a flexible, hollow cylindrical sleeve and a core member longitudinally interengageable into the sleeve. The core member is slightly larger than the bore of the sleeve and when drawn into the sleeve expands it to fill the hole and secure the plug. The plug may be used either internally as a diverting plug or externally as a sealing plug. The inserting tool is designed to position the plug in the hole as desired, and to interengage the core member into the sleeve. The plug is inserted into the hole with the sleeve and core member separate. Then the sleeve is supported in position and the core is interengaged into the sleeve.

Abstract: A runner shearing apparatus which is mounted in the ejection half of a plastic injection molding die for the purpose of separating the part and the runner during the ejection cycle. A sleeve is mounted in the die so that a hole drilled in the upper lip of the sleeve becomes the runner gate. An ejector pin is mounted in the sleeve so that during the ejection of the finished part the gate area is sheared, and the runner falls separate from the part.

Abstract: An apparatus and method of sealing or plugging a hole in an object, such as a coolant passage in an injection molding die. The plug includes a flexible, hollow cylindrical sleeve and a core member longitudinally interengageable into the sleeve. The core member is slightly larger than the bore of the sleeve and when drawn into the sleeve expands it to fill the hole and secure the plug. The plug may be used either internally as a diverting plug or externally as a sealing plug. The inserting tool is designed to position the plug in the hole as desired, and to interengage the core member into the sleeve. The plug is inserted into the hole with the sleeve and core member separate. Then the sleeve is supported in position and the core is interengaged into the sleeve.

Abstract: A core pin for use in a plastic injection mold for forming a hole through a part as it is formed in the mold. A shaft is longitudinally slidable in one of the base members of the mold and extends through the cavity of the mold and abuts the inner face of the opposing base member. A spring biases the shaft toward the second base member. When the mold is open the shaft has a small amount of positive clearance. When the mold closes the spring is compressed and the shaft has zero clearance against the inner face of the second base member, regardless of dimensional changes of the mold.