Patent ID: 6241508
Filing Date: 2001-06-05
Classification: B29C

Abstract:
A high pressure injection molding system comprising:a manifold constructed and arranged for distributing a volume of softened plastic from a single remotely positioned plastic extruder; at least one molding workstation including a split mold and an injector means having an inlet and an outlet, said injector means inlet being fluidly coupled to said manifold means and said injector means outlet being fluidly coupled to said split mold; a check valve means positioned adjacent to said injector means to prevent backflow of softened plastic, said injector means being in fluid communication a resin accumulator including a pressure multiplier for increasing said volume of softened plastic to a higher pressure for transfer to said split mold at said higher pressure; said split mold characterized as having a first movable half and a second stationary half, and being constructed and arranged for receipt of said volume of softened plastic when fixed in a locked position within said molding workstation, each of said split mold halves being respectively coupled to at least one adjacent movable plate and an adjacent stationary plate, which plates are mechanically linked by a plurality of cylindrical tiebars, such that said stationary plate is mechanically coupled to said tiebars proximal end and said at least one movable plate is in slidable engagement with said tiebars; means for locking said split mold characterized by a plurality of slidable wedge shaped securement devices, each wedge shaped securement device positioned for spatial locking about a tiebar when forced between reciprocally angled wear plates located on the rear side surface of each moving plate and the distal end of said tiebars, thereby providing final lockup of said split mold; and a single remotely positioned hydraulic pumping station for providing an operating pressure for transfer of plastic, positioning of said split mold halves, and operation of said slidable wedge shaped securement devices;whereby final lockup of said split mold halves results in application of compressive forces effective to maintain said split mold halves in nominal position during high pressure injection molding conditions.