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:
May. 16, 2000
Filed:
Apr. 14, 1998
John F Murphy, Imlay City, MI (US);
Other;
Abstract
A mold for use in a gas-assisted injection molding system having a nozzle includes a runner shut-off subsystem which prevents pressurized gas from flowing through the runner and into the nozzle. A pair of pins are preferably mounted on a plate to move therewith between extended and retracted positions of the plate. The pins are slidably fit within one mold half of the mold to move within the runner between extended gas-blocking positions to block the flow of pressurized gas through the runner and into the nozzle and retracted positions to allow the flow of molten plastic from the nozzle, through the runner, through a gate, and into an article-defining cavity in a closed position of the mold. The runner shut-off subsystem includes a hydraulic cylinder for moving the plate and the pins relative to the mold half. Each of the pins has a free end portion which extends into another mold half of the mold where it is received and retained in its extended gas-blocking position. Preferably, the pins are ejector pins and the plate is an ejector plate.