Glass forming apparatus

Glass forming apparatus comprising first and second arms pivotable about a vertically disposed pivot shaft, each arm having a mold holder insert on one side of said shaft, first motor means connected to said arms for pivoting the arms between an open and closed position, means for applying a clamping force to prevent movement of the arms toward an open position in timed relationship with said first motor means, said means for applying a clamping force including an extension on each arm and projecting away from said mold holder inserts so as to be on the other side of the pivot shaft, each extension having at least one roller supported for rotation about a vertical axis, a cam movable horizontally toward and away from an operative position wherein the cam is between said rollers, a second motor means, said second motor means being connected to said cam for moving the cam in timed relationship with movement of the arms, said cam in its operative position contacting the rollers and spreading the arm extensions for applying a clamping force to said arms adjacent said mold holder inserts when the arms are in their closed position.

Glass forming apparatus comprising first and second mold holding arms, said arms being pivotable about a pivot axis between a closed position and an open position, first motor means connected to the arms for simultaneously pivoting the arms between an open and closed position, means independent of said first motor means for applying a clamping force to prevent movement of the arms from a closed position toward an open position, said means for applying a clamping force including an extension on each arm projecting beyond the pivot shaft and a second motor means for moving the extensions away from each other in timed relationship with movement of the arms to thereby apply a clamping force to the mold holder arms when the arms are in the closed position, at least one roller on each extension, said second motor means including a cam movable in a direction generally perpendicular to the axis of said rollers toward and away from an operative position wherein the cam is between and in contact with said rollers, said cam in its operative position contacting the rollers and spreading the extensions away from each other, said cam being movable by said second motor means to an inoperative position wherein said first motor means can move said arms from a closed position toward an open position.