Moulding assembly for the injection of plastic materials

Claim 1

Injection molding apparatus, comprising: a first mold block cast of a single piece of light alloy material, defining first and second cavities therein, said first mold block having plural ejector means projecting therethrough, said first cavity being closed by a steel plate, said first cavity enclosing therein means for maneuvering said ejector means, said second cavity having at least one mold cavity defining insert member disposed therein; a second mold block cast of a single piece of light alloy material, defining a third cavity therein, said third cavity having at least one mold cavity defining insert member disposed therein, and means for supplying thermoplastic molding material to mold cavities defined by said mold cavity defining insert members; a face of said first mold block opposite to said first cavity having disposed adjacent thereto a first interchangeable steel plate, and a face of said second mold block opposite to said means for supplying having a second interchangeable steel plate which is interchangeable as said first interchangeable steel plate, said interchangeable steel plates being in contact with each other in the vicinity of a contact surface between said mold cavity defining insert members.