Patent ID: 7891403

Claim:
A mold assembly for forming a piston comprising: a pair of mold halves moveable toward and away from one another along a linear path that is substantially perpendicular to a longitudinal central axis of the piston between an engaged position to provide at least a portion of a mold cavity for forming an outer periphery of the piston and a disengaged position to allow extraction of the piston from the mold cavity; and a first pair of mandrels moveable toward each other along a converging linear path that is oblique to said central axis into an engaged position between said pair of mold halves to form an undercut of the piston, said pair of mandrels being movable away from each other along a diverging linear path relative to said axis to a disengaged position to allow extraction of the piston vertically along said axis, said first pair of mandrels moveable between said engaged position and said disengaged position solely along said diverging linear path.