Patent ID: 8366438
Filing Date: 2013-02-05
Classification: B22D,B29C

Abstract:
1. A mold clamping device comprising: a fixed platen which is installed securely on a machine base, has a plurality of mold clamping cylinders, and retains a fixed mold; a movable platen which is placed on the machine base, retains a movable mold, and moves back and forth with respect to the fixed platen by a mold opening/closing cylinder; a plurality of tie bars, each of which is coupled at one end with a piston of the respective mold clamping cylinder, has at the other end part or the central part in the axial direction a screw or a ring groove formed in a serration shape or in a rectangular tooth shape, and penetrates through the movable platen; mold clamping half nuts which are attached to the movable platen and engaged with or disengaged from the screw or the ring groove of the respective tie bars; and a pair of additional half members which is attached to the movable platen, is restricted in the axial direction of the respective tie bars, moves in an opening/closing direction of the half nuts relative to the mold clamping half nuts, and engages with or disengages from the screw or the ring groove of the respective tie bars, wherein when the mold clamping half nuts are closed and mated with the screw or the ring groove of the respective tie bars, the additional half members are closed to hold the respective tie bars so that play at mated parts is removed or cancelled by fixation.