The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 01, 1988
Filed:
Oct. 09, 1987
David E Boring, New Oxford, PA (US);
Sonoco Products Company, Hartsville, SC (US);
Abstract
A self-regulating gate valve assembly, adapted for use in a plastic product injection molding apparatus having a mold cavity and a core therein for molding a hollow product of predetermined design, is characterized by a construction substantially eliminating core deflection during plastic molding compound flow in the injection molding apparatus and thus uneven wall thicknesses and weld lines in the hollow molded plastic product. The gate valve assembly includes a valve pin of unique construction for creating a sheath-like flow configuration of the plastic molding compound as it is injected into the mold cavity to produce balanced forces on the mold core to prevent deflection and for closing the gate in a self-regulating manner when the mold cavity is filled.