Device for closing and opening the mold halves of a glass molding machine

Each mold half is held by means of a mold half holding mechanism which can be driven so as to pivot in a reciprocating manner about a common vertical hinge column by means of a vertical shaft, which is mounted in a rotatable manner in a frame of the glass forming machine, and by means of first intermediate members. Each shaft is connected via a lever mechanism to a common drive shaft which can be pivoted in a reciprocating manner by means of a drive element, which can be moved linearly in a reciprocating manner, of a drive and by means of second intermediate members. The drive element can be mounted on a nut and secured against rotating about a longitudinal axis of the drive element by means of a guide device. The nut is in engagement with a spindle. The spindle is mounted in an axially fixed, rotatable manner and can be driven rotationally in a reciprocating manner by means of the drive.