Die casting mold

Claim 2

A die casting mold comprising a fixed die part having a sprue cavity, an external runner cavity in communication with said sprue cavity, and an external mold cavity spaced from said sprue and runner cavities; a movable die part engageable with and disengageable from said fixed die part and having gate means and internal runner means in communication with each other, said gate and runner means being adapted, upon engagement of said movable die part with said stationary die part, to communicate with said mold cavity and with said external runner cavity, respectively; runner ejector means movably mounted on said movable die part and operable, upon disengagement of said movable die part from said stationary die part, to eject solidified casting material from said internal runner means; and casting ejector means movably mounted on said movable die part and operable, upon disengagement of said movable die part from said stationary die part, to eject solidified casting material from said gate means integrally with a casting formed in said mold cavity.

Claim 3

A die casting mold as set forth in claim 1, wherein said movable die part has an external plug cavity in facing relation to said sprue cavity of said fixed die part, said plug cavity being undercut so that cast material lodged therein and in said external runner means will be releasably anchored to said movable die part for withdrawal therewith from said fixed die part.

Claim 4

In a die casting mold having a parting line, the combination of a fixed die part having external runner means along said parting line, a sprue cavity extending transversely of and communicating with one end of said runner means, and a mold cavity along said parting line spaced from said runner means and sprue cavity; a back and forth movable die part having gate means in angular relation to said parting line, and internal runner means merged with and extending angularly from said gate means; said gate and internal runner means communicating, in the closed condition of the mold, with said mold cavity and with the other end of said external runner means, respectivEly, on said parting line; runner ejector means movably mounted on said movable die part and operable, in the open condition of the mold, to eject solidified casting material from said internal runner means together with casting material solidified in said external runner means and sprue cavity; and casting ejector means movably mounted on said movable die part and operable, in the open condition of the mold, to eject solidified casting material from said gate means integrally with a casting formed in said mold cavity.

Claim 5

In a die casting mold having a parting line, the combination of a fixed die part having external runner means along said parting line, a sprue cavity extending transversely of and communicating with one end of said runner means, and a mold cavity along said parting line spaced from said runner means and sprue cavity; a back and forth movable die part having gate means in angular relation to said parting line, and internal runner means merged with and extending angularly from said gate means; said gate and internal runner means communicating, in the closed condition of the mold, with said mold cavity and with the other end of said external runner means, respectivEly, on said parting line; runner ejector means movably mounted on said movable die part and operable, in the open condition of the mold, to eject solidified casting material from said internal runner means together with casting material solidified in said external runner means and sprue cavity; and casting ejector means movably mounted on said movable die part and operable, in the open condition of the mold, to eject solidified casting material from said gate means integrally with a casting formed in said mold cavity.

Claim 6

A die casting mold as set forth in claim 3, wherein said internal runner means are afforded by a plurality of feed passages in transversely spaced relation to each other, and wherein said gate means are afforded by a plurality of elongated passages in communication, respectively, with said feed passages.

Claim 7

A die casting mold as set forth in claim 4, wherein said runner ejector means comprise a plurality of reciprocable pins in axial alinement respectively, with said feed passages.

Claim 8

A die casting mold as set forth in claim 4 wherein said casting ejector means comprise a plurality of reciprocable pins in transversely spaced relation to each other and movable endwise in the general direction of said gate passages.

Claim 9

A die casting mold as set forth in claim 3, wherein said external runner means are afforded by a trunk cavity merged at one end with said sprue cavity, and by branch cavities merged with the other end of said trunk cavity, and wherein said internal runner means are afforded by a plurality of feed passages extending, in the closed condition of the mold, transversely of said branch cavities in merging relation therewith.

Claim 10

A die casting mold as set forth in claim 7 and further comprising a plug cavity in said movable die part along said parting line and in facing relation to said one end of said trunk cavity; said plug cavity being obliquely undercut so that cast material solidified therein and in said trunk cavity will be releasably anchored to said movable die part for withdrawal therewith from said fixed die part.

Claim 11

A die casting mold as set forth in claim 4, wherein said elongated gate passages are tapered toward their junctures with their respective feed passages.

Claim 12

A die casting mold as set forth in claim 9, wherein said gate passages extend in the general direction of back and forth movement of said movable die part, and wherein said runner passages extend at generally right angles to said gate passages.