Patent ID: 7452201
Filing Date: 2008-11-18
Classification: B29C

Abstract:
1. A valve gate system for an injection molding machine, comprising: a valve gate unit configured to be in contact with a manifold of an injection molding machine for delivering a molten plastic flow from a hot runner system to an injection chamber, said valve gate unit having a valve pin for controlling the flow of the molten plastic from a hot runner system to an injection chamber; and an activating unit coupled with said valve gate unit, configured to be mounted external to a mold unit that houses the injection chamber, said activating unit having an element that extends through the mold unit to engage said valve pin, so as to control the molten plastic flow from a runner system to an injection chamber wherein said activating unit comprises one of a pneumatic and a hydraulic cylinder, wherein the piston of said cylinder is configured to engage an activating bar of said element, said activating bar having a slot configured to engage one end of a yoke that is held in the body of said valve gate unit, the other end of the yoke is configured to engage said valve pin, such that a push-pull movement of the piston causes a push-pull movement of the activating bar which in turn causes a down and up movement of said one end of said yoke, which in turn causes an up and down movement of said valve pin, said activating bar comprising more than one section and an activating insert having a slot and a non-slotted connecting bar.