Abstract: A gas pressurized ball is packaged under pressure by first compressing the ball about its girth and then compressing it about its full surface in the smaller spherical cavity of a mold section. A device for compressing the ball includes a collar member of smaller diameter than the ball and a pair of spherically faced cavitied mold members which are assembled with the collar to form a spherical closure chamber. The mold members may include lips which enter the collar opening or may, with the collar face, form the closure chamber. The collar and a spherically faced cavitied mold member, in one form, are integrally formed and a ball injection plunger registers with a bore in the mold member. Another device includes three mutually hinged members each having a cavity so that when the members are swung to a closed condition the cavities form a spherical chamber smaller than the ball.

Abstract: A pressure vessel for storing tennis balls includes a cylindrical open topped receptacle having in its inside upper border a peripheral groove separably engaging an elastomeric O-ring gasket provided with a finger removal tab. A vertical coaxial post is anchored to the receptacle base and axially movably supports for movement between limited raised and depressed positions a coupling member which is spring urged to raised position and releasably locked in its depressed position. A dished cover is coaxially separably connected to the coupling member and has an outwardly downwardly inclined peripheral lip engaging the O-ring when the cover is in raised position to effect an air tight seal. Mounted on the receptacle peripheral wall and communicating with the interior thereof are a pressure gauge, a pressure release and safety valve and a pressurizing check valve.