Patent ID: 6513569
Filing Date: 2003-02-04
Classification: B22D

Abstract:
A vacuum valve for die casing machine, comprisinga valve seat having a plurality of positioning pins and an accommodating tank, and pair of gears pivotally arranged in the accommodating tank; a bottom die having a vent hole connected to the valve seat and a plurality of positioning holes engaged with the positioning pins, the bottom die further having an induction hole and a valve hole; a top die having a feed-in inlet connected to the bottom die and a lead-in runner between the bottom die and the top die; an induction rod arranged on a tooth rack near the feed-in inlet and passing through the induction hole; a control rod arranged on a tooth rack near the vent hole and passing through the valve hole, the control rod having a plurality of axial slots near one distal end thereof and initially exposed out of the valve hole, the axial slots being moved with the control rod to indent into the valve hole to seal the valve hole, wherein each of the gears are engaged with a respective tooth rack.