Mandrel adjustment system in a plastic resin blow molding machine
OwnerErnest O. Kuenzig, Frank L. Penninoinventors
Life of this patent
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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.
Claims20
An apparatus in a plastic resin blow molding machine to adjust the vertical position of a vertically aligned mandrel relative to a forming die, the mandrel and forming die forming a tubular parison, in which the mandrel has a cylindrical top shaft portion having external screw threads, the forming die is positioned within a die block, the mandrel top shaft portion extends above the die block, and vertical spacer means are positioned on the die block,
- the improvement comprising a horizontally aligned plate member connected to the spacer means and having an orifice therethrough, a mandrel adjustment nut having internal screw threads which mate with the screw threads of the top shaft portion of the mandrel, the adjustment nut being rotatably positioned on the plate member so that it freely rotates thereon, a ratchet ring means connected to the adjustment nut and having a plurality of spaced ratchet means about its external side wall so that its rotation will rotate the adjustment nut, and
- a ratchet wrench means positioned on the ratchet ring means to rotate said ratchet ring means and its connected thereto adjustment nut to lower and raise the mandrel relative to the forming die, said ratchet wrench means having a ratchet pawl which fits, in sequence, into the spaced ratchet means and an arm member to apply rotational pressure to said ratchet ring means through said pawl and to thereby rotate said adjustment nut;
- and
- set means to selectively lock said adjustment nut against rotation relative to the plate member.
An apparatus in a plastic resin blow molding machine to adjust the vertical position of a vertically aligned mandrel relative to a forming die, the mandrel and forming die forming a tubular parison, in which the mandrel has a cylindrical top shaft portion having external screw threads, the forming die is positioned within a die block, the mandrel top shaft portion extends above the die block, and vertical spacer means are positioned on the die block,
- the improvement comprising a horizontally aligned plate member connected to the spacer means and having an orifice therethrough, a mandrel adjustment nut having internal screw threads which mate with the screw threads on the top shaft portion of the mandrel, the adjustment nut being rotatably positioned on the plate member so that it freely rotates thereon, a ring ratchet means about its external side wall so that its rotation will rotate the adjustment nut, and
- a ratchet wrench means removably positioned on the ratchet ring means to rotate said ratchet ring means and its connected thereto adjustment nut to lower and raise the mandrel relative to the forming die, said ratchet wrench means having a pawl which fits said spaced ratchet means and an arm member carrying said pawl and which at least partially spans and grips said ring ratchet means, and
- clamp means removably attachable to said mandrel and fixed against rotation relative to said spacer means to selectively lock said mandrel against rotation relative to the spacer means while permitting vertical movement of said mandrel.
Dependencies are inferred from the claim text.