Mold parting line venting means

Claim 1

IN A MOLD COMPRISING AT LEAST TWO RELATIVELY MOVABLE METAL COMPRISING HAVING PARTING LINE FACES SERVING AT LEAST IN PART TO DEFINE A CAVITY IN SAID MOLD INTO WHICH MOLTEN MATERIAL IS INTRODUCED UNDER PRESSURE, THE COMBINATION OF VENT MEANS AFFORDING PASSAGE MEANS FOR THE ESCAPE OF GAS AND AIR FROM THE CAVITY; SAID VENT MEANS BEING FORMED IN AND EXTENDING PARALLEL TO AT LEAST A PORTION OF THE PARTING LINE FACE OF AT LEAST ONE OF SAID COMPONENTS WHICH IS JUXTAPOSED TO THE MATING FACE OF THE OTHER OF SAID COMPONENTS WHEN SAID COMPONENTS ARE JUXTAPOSED TO FORM THE MOLD; SAID VENT MEANS EXTENDING FROM THE MOLD CAVITY TO A POINT OF COMMUNICATION WITH ATMOSPHERE AND INCLUDING AN ORIFICE PORTION SPACED FROM THE MOLD CAVITY AND COMPRISING A SHORT, WIDE GROOVE IN SAID ONE PARTING LINE FACE WHICH IS OF SUCH SHALLOW DEPTH AS TO BE CAPABLE OF PERMITTING ONLY GAS AND AIR TO FLOW THERETHROUGH AND SAID VENT MEANS FURTHER INCLUDING A DEEPER PORTION DISPOSED UPSTREAM OF AND COMMUNICATING WITH SAID ORIFICE PORTION AND ADAPTED TO RECEIVE MOLTEN MATERIAL FROM THE MOLD CAVITY AND TO CAUSE RECEIVED MOLTEN MATERIAL TO BE CONGEALED THEREIN BEFORE REACHING SAID ORIFICE PORTION.