Molding of all plastic shotshell cases

Claim 1

An all plastic shotshell case mold comprising: a plurality of movable parts cooperatively defining the exterior periphery of the mold cavity for the shotshell case, a stationary mold part cooperating with the movable mold part and defining the end of the mold cavity for the closed end of the shotshell case, the stationary mold part defining the sprue through which plastic is supplied into the mold cavity, and a core between the movable mold parts and within the cavity defined thereby and defining the interior periphery of the mold cavity for the shotshell case, the core having a rigid pin on the end of the core to extend into and be seated in the sprue for locating the core concentrically of the mold cavity, the rigid pin having a plurality of longitudinally oriented grooves in the periphery thereof and said pin having grooves across its end, said grooves forming ribs in the plastic mold, said longitudinally oriented grooves in the pin being spaced around the periphery of the pin to simultaneously direct plastic into all peripheral portions of the mold cavity, the sprue and pin being tapered and the pin bottoming against the sprue, and said grooves connecting the sprue with the mold cavity for directing plastic into the mold cavity while the pin is seated in the sprue.