A press for forming sheet material into a shaped article comprising a frame, first and second complementary dies, a cam supported by the frame for reciprocally moving the first die along an axis between a first position axially spaced from the second die and a second position fully mated with the second...http://www.google.ca/patents/US4588539?utm_source=gb-gplus-sharePatent US4588539 - Process and press with a controlled pressure system
