Valve gate device for use in an injection mold
AssigneeMitsubishi Materials Corporation
InventorYoshinobu Takeda
Life of this patent
Estimating the term…
Abstract
An injection molding method, an injection mold and a valve gate device, in which a movable pin moves easily, without excess force being exerted thereto, to properly open and close a gate. Closing a gate 10B by a cylindrical movable pin 27 allows excess resin to easily return back to a resin conveying path side through an outer edge portion at the end of the movable pin 27, so that even a large-diameter gate 10B can be reliably closed by the movable pin 27 which can be easily moved due to reduced resin resistance on the movable pin 27.
Claims5
A valve gate device for use in an injection mold having a cavity defined between a pair of mold plates in order to supply resin into the cavity through a gate, said valve gate device comprising:
- a valve body having a resin-conveying path which communicates with the cavity through said gate;
- a supporting pin having one end facing the center portion of said gate;
- a cylindrical movable pin for opening and closing said gate, which is provided around said supporting pin so as to be movable along an axial line of said movable pin;
- and
- a spring which continuously elastically biases said supporting pin in a direction towards said one end thereof.
Dependencies are inferred from the claim text.