Patent ID: 7635261

Claim:
An apparatus for vibrating a mold box of a type including a pallet supporting a bottom surface of the mold box, the apparatus comprising: a vibration table comprising: a plurality of moveable plates operable to reciprocate vertically between a lowered position immediately beneath the pallet supporting a bottom surface of the mold box, and a raised position at which position the moveable plates impact and lift upward an underside of the pallet supporting the bottom surface of the mold box; and a plurality of fixed bars, interleaved with said moveable plates, and mounted at approximately the lowered position, wherein the pallet impacted by the moveable plates and driven upward falls downward to impact against said fixed bars; a pair of die supports located on either side of the moveable plates, the mold box being coupled to and spanning across the die supports; a torque tube equalizer shaft assembly coupled between the die supports to help synchronize the movement of one die with the other during the vibration process; and a vibration direction control apparatus adapted to maintain said mold box to be vibrated in a generally vertical direction.