Mold-closing means, particularly for die-casting and injection molding machines for metals and synthetics

Claim 1

A mold-closing device, comprising: a stationary mold-carrier plate; a stationary end plate spaced from said mold-carrier plate; said movable mold-carrier plate along said rails; guide rails interconnecting said plates; a movable mold-carrier plate slidable along said rails between said end plate and said stationary mold-carrier plate between an open-mold position and a closed-mold position, said moldcarrier plates being adapted to mount respective mold halves; a pressure box interposed between confronting surfaces of said end plate and said movable mold-carrier plate and including a piston member and a cylinder member connected to said movable mold-carrier plate, said pressure box being energizable during introduction of material into the mold to prevent separation of said mold halves and bearing in opposite directions on said end plate and said movable mold-carrier plate, said piston member being formed with a pressure piece extending in the direction of said end plate and constituted of a nut threadedly connected with a spindle for adjusting the effective length of said pressure piece, said end plate being provided with an aperture adapted to receive said pressure piece; a thrust plate slidable along said surface of said end plate for selective axial alignment with and disalignment from said pressure piece for alternately covering said opening completely and uncovering said opening, said thrust plate overlying said surface of said end plate and being engageable with said pressure piece in a position of said thrust plate covering said opening; a piston-and-cylinder unit mounted upon said end plate for shifting said thrust plate transversely to the direction of said movable mold-carrier plate along said rails; mold-closure means operable independently of said pressure box for shifting said movable mold-carrier plate between said positions; a pair of variable-length adjustable ejector abutments mounted on said end plate and projecting from said surface thereof toward said mold, the effective length of said pressure box and pressure piece plus the thickness of said thrust plate being greater than the lengths of said ejector abutments measured from said surface of said end plate; an intermediate plate disposed between said movable mold-carrier plate and said end plate, said intermediate plate being provided with said pressure box and passages registering with said abutments; an ejector plate between said intermediate plate and said movable mold-carrier plate in the path of said abutments upon penetration thereof through said passages; and ejector pins on said ejector plate extending through said movable mold-carrier plate for dislodging a molded article therefrom.