초록 ▼

An injection mold utilizes a collapsible core portion which includes a core portion and a mold cavity portion. A core base is provided as part of the core portion. A first mold ring is positioned about the core base and longitudinally movable to define a first annular parting line between the core b

An injection mold utilizes a collapsible core portion which includes a core portion and a mold cavity portion. A core base is provided as part of the core portion. A first mold ring is positioned about the core base and longitudinally movable to define a first annular parting line between the core base and first mold ring. The first mold ring carries outer core members and controls their longitudinal positioning along the core base while permitting them to move radially inwardly and outwardly between molding and collapsed positions. A second mold ring is carried on the core and includes stripper ring means, the second mold ring being longitudinally movable to define a second annular parting line with the first mold ring. The second mold ring also forms a third, annular parting line with the mold cavity portion. Means are provided for relatively moving the core base, mold cavity portion, and first and second mold rings in a longitudinal direction relative to each other and the mold cavity portion. Locking means may be provided for locking the parting lines closed in the molding position and to sequentially open them.

대표청구항 ▼

In an injection mold having a mold cavity portion and a collapsible core portion, said mold cavity portion and collapsible core portion being movable between open and closed positions, and including means for defining a mold chamber between said mold cavity portion and collapsible core portion in th

In an injection mold having a mold cavity portion and a collapsible core portion, said mold cavity portion and collapsible core portion being movable between open and closed positions, and including means for defining a mold chamber between said mold cavity portion and collapsible core portion in the closed position, plus aperture means permitting filling of the mold chamber with molding compound, said core portion defining a core base, and outer core members longitudinally movable along said core base between a molding position and a collapsed position, the improvement comprising, in combination: said collapsible core portion also including a first mold ring positioned about said core base, said first mold ring being longitudinally movable to define a first, annular parting line between said core base and first mold ring, said first mold ring carrying said outer core members to control the longitudinal positioning of said outer core members while permitting said outer core members to move radially inwardly and outwardly between molding and collapsed positions; a second mold ring carried on said collapsible core portion, said second mold ring including stripper ring means, said second mold ring being longitudinally movable to define a second, annular parting line with said first mold ring, said second mold ring also forming a third, annular parting line with the mold cavity portion; means for relatively moving said core base, mold cavity portion, and first and second mold rings in a longitudinal direction relative to each other; and locking means for locking at least said third parting line closed in the molding position and to sequentially open said parting lines, whereby, as the mold moves from the closed position to the open position, the first parting line, the third parting line, and then the second parting line are sequentially opened, and means to cause said outer core members to move to a collapsed position as the first parting line opens, and to cause said outer core members to move again outwardly to a molding position as the first parting line closes. In an injection mold having a mold cavity portion and a collapsible core portion, said mold cavity portion and collapsible core portion being longitudinally movable between open and closed positions, and including means for defining a mold chamber between said mold cavity portion and collapsible core portion in the closed position, plus aperture means permitting filling of the mold chamber with molding compound, said core portion defining a core base having tapered side portions, and outer core members longitudinally movable along said core base between a molding position and a collapsed position, and the improvement comprising, in combination: said collapsible core portion also including a first mold ring positioned about said core base, said first mold ring being longitudinally movable to define a first, annular parting line between said core base and first mold ring, said first mold ring carrying said outer core members to control the longitudinal position of said outer core members, but permitting said outer core members to move radially inwardly and outwardly between molding and collapsed positions while moving along said tapered core base; a second mold ring carried on said collapsible core portion, said second mold ring including stripper ring means, said second mold ring being longitudinally movable to define a second, annular parting line with said first mold ring, said second mold ring also forming a third, annular parting line with the mold cavity portion; first rack means carried by said core base; second rack means carried by said mold cavity portion; and pinion means carried by said second mold ring, said first and second rack means and pinion means being positioned so that the pinion means is placed between the first and second rack means, said pinion means simultaneously rolling against both of said first and second rack means; means for longitudinally moving said first mold ring; and means to sequentially open said first, second, and third annular parting lines, whereby, as the mold moves from the closed position to the open position, the first parting line, the third parting line, and then the second parting line are sequentially opened; and means to cause the outer mold members to collapse inwardly to the collapsed positioned as the first parting line opens and to cause said outer core members to move again outwardly into a molding position as the first parting line closes. In a mold having more than two movable separable portions said movable, separable portions defining a plurality of parting lines, the improvement comprising, in combination: a longitudinally positioned bar pivotally attached to one of said movable, separable portions; first cam means carried on at least one other of said movable, separable portions said cam means being positioned to engage and hold said bar in a first predetermined angular position; latch member means carried on said bar and latch sites carried on two of said other separable portions, said latch member means and latch sites being positioned to lock together to prevent separation of two of said separable portions while the bar is in the first predetermined angular position, to lock at least one of the parting lines, and second means for causing said bar to pivot to another angular position, as the movable, separable portions move to another predetermined position, in which the latch member means and latch sites can separate, whereby said one parting line can be automatically opened later than at least one other parting line by moving said movable, separable portions.