Blow pin assembly
AssigneeUltraseal Technologies Corporation
InventorsRichard J. Cobiski, Emanuel E. Wohlgemuth
Life of this patent
Estimating the term…
Abstract
A blow pin assembly is provided for inflating a parison and forming the neck portion of a plastic container in a blow molding apparatus. The blow pin assembly is mountable to a blow rod. It includes a blow pin body including an exterior surface having a tapered portion and a cutting edge beneath the tapered portion. The tapered portion cooperates with the master seal of the mold to automatically center the assembly before the cutting edge engages the shear steels to sever the blow molded article from the mold. The cutting edge adjoins a rim extending substantially perpendicularly from the blow pin body, and can be resharpened one or more times.
Claims12
An assembly for severing a neck portion of a blow-molded container, comprising:
- a set of opposing master seals defining a first passage;
- a pair of opposing shear steels defining a second passage, said second passage being aligned with said first passage;
- and
- a blow pin assembly extending through said first and second passages and moveable therein along an axis between up and down positions, said blow pin including an exterior surface having a tapered portion and a cutting edge located beneath said tapered portion, said cutting edge approximating the inner diameter of said second passage and adjoining a rim extending substantially perpendicularly with respect to said axis, said rim having an upwardly facing surface, said tapered portion increasing in diameter in the direction of said cutting edge, said cutting edge adjoining said shear steels when said blow pin is in the up position, said tapered portion being in opposing relation to said set of opposing master seals when said blow pin assembly is moved from the down position to the up position such that said master seals can guide said blow pin assembly as it moves towards the up position.
A blow pin assembly comprising:
- a blow pin body having a longitudinal axis and including an upper portion, a lower portion, a recessed portion between said upper and lower portions, and a passage extending therethrough;
- a substantially conical exterior surface formed on said upper portion of said blow pin body and increasing in diameter in the direction of said lower portion;
- a substantially annular rim formed on said lower portion of said blow pin body and bounding said recessed portion, said rim extending substantially perpendicularly to said longitudinal axis of said blow pin body and having an outer edge defining a cutting edge;
- and
- an annular exterior surface formed on said lower portion of said blow pin body and adjoining said cutting edge.
Dependencies are inferred from the claim text.