Patent ID: 6908584

Claim:
An apparatus, comprising: an upper mold; a first top plate per upper mold, said top plate having the upper mold; a single bottom plate having a bottom mold, said bottom mold having an upper surface defining a first plane; three lock rods per top plate, each of said lock rods having a first end and a second end, each of said lock rods having a surface; locking means operatively connected to each of said lock rods, wherein said locking means are operatively connected to said bottom plate; and, cylinder mechanisms operatively connected to said locking means, wherein said cylinder mechanisms are adapted to move said locking means to said surface of said lock rods, said cylinder mechanisms also adapted to place tension on said lock rods, wherein each of said cylinder mechanisms is a hydraulic cylinder, said cylinder mechanisms being supplied with hydraulic fluid from a common source, each of said cylinder mechanisms having a floating piston positioned therein, said floating piston having a self-adjusting stroke; and wherein a lower surface of said upper mold defines a second plane; said top plate adapted to adjust via the self-adjusting stroke of said floating pistons such that said second plane is parallel to said first plane such that equal force is applied to each of said lock rods which results in uniform force being applied to said molds.