Patent ID: 6666258
Filing Date: 2003-12-23
Classification: B22D,Y10S

Abstract:
An injection molding apparatus comprising:a first chamber means for melting a solid material; a second chamber means for holding the melted material; a third chamber means for holding the melted material to be transferred into a mold cavity; a first conduit means for transferring the melted material from the first chamber means to the second chamber means; a means for moving the second chamber means and the third chamber means toward the mold cavity; a means for preventing movement of the first chamber means during the step of moving the second chamber and the third chamber toward the mold cavity; a second conduit means for transferring the melted material from the second chamber means to the third chamber means; a first piston means in the third chamber means for transferring the melted material from the third chamber means to a mold cavity; and a screening element adjacent to a bottom of the first chamber means, the screening element comprising at least one non-horizontal wall and a top wall enclosing an interior volume and having a first outlet on the at least one non-horizontal wall, the first outlet comprising an opening into the interior volume of the screening element and the at least one non-horizontal wall circumscribing a second outlet in the bottom of the first chamber means.