Abstract: A tennis ball container assembly includes a generally cylindrical container having an open top end, a membrane seal which is secured to the open end of the container for holding pressurized gas in the container, and a cap which is screwed onto the top of the container. The cap includes a flexible portion and a prong on the flexible portion for piercing the membrane seal when the flexible portion is pushed downwardly toward the seal. After the internal pressure in the container is vented, the cap can be unscrewed.

Abstract: Injection molding apparatus (10) for processing and transferring molding material from a feed mechanism (30) to a nozzle (75) for discharging into a mold including a bolster (12), an injection head (11) extending through the bolster, an injection barrel (37) in the injection head for containing a predetermined sized shot of the molding material, a plunger (46) movable in the injection barrel for discharging the shot of molding material into the mold, a bore (47) extending longitudinally of the plunger for loading molding material into the barrel, feed mechanism (30) supplying molding material to the bore of the plunger irrespective of the position of the plunger, and a valve (60) 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.