Blow-molding apparatus
AssigneePari Industries, Inc.
InventorFrank Pennino
Life of this patent
Estimating the term…
Abstract
A pair of shear steels are carried by companion mold members. Each shear steel including a shearing edge and a sealing rim, is slidable along a path perpendicular to the axis of a blow pin and to the open-close path of the mold members. The shearing edges of the shear steels are aligned with each other and with the blow pin by a locating element of each of the shear steels. Alignment takes place during the closing of the mold members. The locating elements may be discrete elements or the sealing rims may perform the locating function.
Claims13
A pair of shear steels for use in blow-molding apparatus,
- said blow molding apparatus including a blow pin operable along an axis and bearing a shearing ring providing a circular shearing edge whose center is on said axis, and said apparatus having a pair of mold members adapted to close against each other with said blow pin disposed between them and to carry said shear steels into cooperation with said blow pin,
- said pair of shear steels including (a) respective semicircular shearing edges which constitute a full-circle shearing edge when the shear steels are disposed opposite to each other so that the centers of their semicircular shearing edges are disposed on a common axis, said shear steels having (b) respective sealing rims adapted to cooperate with the blow pin for forming a seal in the neck of a container being blow-molded, and each of said shear steels having (c) locating means cooperable with said blow pin when carried against the blow pin by said mold members for shifting each shear steel so as to align said common axis of each shear steel with the axis of the blow pin's circular shearing edge.
Apparatus for blow molding a container having a neck, said apparatus having a blow pin operable along an axis and having a sealing ring and a shearing ring in axial alignment, and a pair of mold members movable toward and away from each other to close and open the mold, said mold members carrying respective devices cooperable with the blow pin for acting on a parison extending along and around the blow pin to form a seal surrounding the blow pin and for providing a full-circle shearing edge cooperable with the shearing ring of the blow pin to shear the parison when the blow pin is operated axially,
- the improvement wherein each of said devices includes a shear steel having a semicircular shearing edge and a semicircular sealing rim which are unified with each other and which have a common axis, and each said shear steel-having locating means cooperable with the blow pin for shifting the shear steel as may be necessary for aligning each said common axis with the axis of the blow pin, each shear steel being mounted on its respective mold member for sliding motion along a slide path perpendicular to the direction of movement of the mold members in opening and closing and perpendicular to the axis of the blow pin.
Dependencies are inferred from the claim text.