Apparatus for formation of thermoplastic sheet into a cup-like container

Claim 1

APPARATUS FOR FORMING MOLDABLE THERMOPLASTIC SHEET MATERIAL INTO A CONTAINER COMPRISING, A MOLD CAVITY HAVING A CONTAINER FORMING RECESS, AND A PERIPHERAL PROJECTION WHICH SERVES AS A MATERIAL SEVERING MEANS, AND A MOLD TOP ASSEMBLY HAVING A RECESS WITH A SYMMETRICALLY FORMED UNDULATED CURVED SURFACE WHICH WILL PROVIDE CONTROLLED PRESTRETCH OF THE SHEET MATERIAL AT DESIRED AREAS THEREON, SAID MOLD TOP ASSEMBLY BEING MOVALBE TOWARD THE MOLD CAVITY AND BEING FORMED WITH A DISC-LIKE RECESS WHICH IS ARRANGED FOR A SLIDING FIT WITH SAID PERIPHERAL PROJECTION, SAID SYMMETRICALLY FORMED UNDULATED SURFACE HAVING AN AXIALLY DISPOSED ROUNDED PROJECTION EXTENDING IN THE DIRECTION OF SAID DISC-LIKE RECESS, AND SAID MOLD TOP ASSEMBLY BEING FORMED TO PROVIDE A PASSAGEWAY SELECTIVELY CONNECTIBLE WITH EITHER A SOURCE OF SUBATMOSPHERIC PRESSURE OR A SOURCE OF SUPERATMOSPHERIC PRESSURE, SAID MOLD CAVITY BEING FORMED TO PROVIDE A PASSAGEWAY SELECTIVELY CONNECTIBLE WITH EITHER A SOURCE OF SUPERATMOSPHERIC PRESSURE OR A SOURCE OF SUBATMOSPHERIC PRESSURE.