Patent ID: 6425433
Filing Date: 2002-07-30
Classification: B22D,Y10S

Abstract:
An apparatus for injecting molten material into a mold cavity while venting said mold cavity, said apparatus comprising:(a) an injection piston in communication with said mold cavity and mounted for reciprocation within an injection cylinder so that, as said injection piston reciprocates within said injection cylinder, molten material within said injection cylinder is forced into said mold cavity; (b) a vacuum cylinder; (c) a vacuum line causing said mold cavity to be in communication with said vacuum cylinder; (d) a vacuum piston being mounted for reciprocation within said vacuum cylinder so that, as said vacuum piston reciprocates within said vacuum cylinder, air is evacuated through said vacuum line from within said mold cavity; and (e) ganging means for coupling said vacuum piston and said injection piston for simultaneous coordinated movement so that, as said injection piston reciprocates into said injection cylinder, said vacuum piston is caused to reciprocate out of said vacuum cylinder.