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United States Patent 4744746
Douris , ê et al.

Injection molding apparatus

Granger May 17, 1988

Abstract

Injection molding apparatus for processing and transferring molding material from a feed mechanism to a nozzle for discharging into a mold including a bolster, an injection head extending through the bolster, an injection barrel in the injection head for containing a predetermined sized shot of the molding material, a plunger movable in the injection barrel for discharging the shot of molding material into the mold, a bore extending longitudinally of the plunger for loading molding material into the barrel, feed mechanism supplying molding material to the bore of the plunger irrespective of the position of the plunger, and a valve closing the bore upon movement of the plunger in one direction for discharging the shot of molding material and opening the bore upon movement of the plunger in the other direction for discharging the barrel with a predetermined shot of molding material. The apparatus may include an auxiliary mechanism for supporting the feed mechanism at a location displaced from the plunger to maintain the feed mechanism substantially perpendicular to the direction of movement of the plunger.