Abstract: A plastic cap has a tearable outer skirt depending from a top disc, the interior of the skirt having means engaging with cooperating means on a container neck to hold the cap in place until the lower portion of the skirt is torn. To prevent dishonest persons from defeating the tamper resistant character of the cap by prying upward on the bottom edge of the cap skirt, a shoulder has been formed on the neck fitting closely under the bottom edge of the cap skirt. To further reduce such prying, a series of protrusions is formed on the shoulder with spaces between the protrusions. The protrusions inhibit fingernails from access to the lower edge of the skirt. The bumper ring which cooperates with loading grippers is interrupted by straight sections which prevent collapse of the bumper ring when the cap is applied.

Abstract: A plastic resin blow molding machine to form bottles from a thermoplastic resin forms a tubular parison of plastic resin by extruding the molded plastic from the circular orifice formed between a vertically aligned mandrel and a forming die. The mandrel is vertically adjusted relative to the forming die by an adjustment nut having screw threads which mate with the screw threads of the mandrel. The adjustment nut is rotatably mounted on a plate and is fixed to a ratchet ring having evenly spaced indentations, the ratchet ring being turnable by a ratchet wrench having a spring-loaded pawl.

Abstract: A plastic bottle is formed by extruding a hot plastic parison around a blow pin within a two-part mold. The mold is closed and sealed and the parison is expanded by air pressure against the cooled internal wall of the mold. Each mold half at its top neck carries a sealing assembly which seals against the blow pin. The blow pin is cooled by the air pressure and has an elongated lower tubular portion with air holes which are slanted upwardly to form a selected blow air pattern to aid in forming the handle portion of the bottle.

Abstract: In a blow molding machine a tubular parison is extruded around a blow pin, a two-part mold is closed and the parison is expanded by air pressure against the internal wall of the mold. Each mold half at its top neck carries a sealing member comprising a first insert, which is a shear insert, in the form of an approximately flat one-half ring to sever the parison against the blow pin; a second insert, which is a seal insert, in the form of a flat approximately one-half ring, to seal the parison against the blow pin; and a base member, in the form of an approximately one-half ring, having an inverted shelf to locate and support the shear and seal inserts.

Abstract: In a blow molding machine a tubular parison is extruded around a blow pin, a two-part mold is closed and the parison is expanded by air pressure against the internal wall of the mold. Each mold half at its top neck carries a sealing member comprising a first insert, which is a shear insert, in the form of an approximately flat one-half ring to sever the parison against the blow pin; a second insert, which is a seal insert, in the form of a flat approximately one-half ring, to seal the parison against the blow pin; and a base member, in the form of an approximately one-half ring, having an inverted shelf to locate and support the shear and seal inserts.