Runner shut-off for an injection molding system
OwnerLeo A. Vandenberginventor
Life of this patent
Estimating the term…
Abstract
A runner shut-off for an injection molding system press fit into a blind bore formed in one of the mold plates. The bore cuts through one of the runners that supplies material to the mold cavities. The runner shut-off includes a casing and a core pin rotatably received in the casing. The core pin is movable to a number of discrete rotated positions with respect to the casing. Slots are formed in the casing and the core pin to join the runners cut by the bore when the core pin is rotated to a position allowing flow of material.
Claims11
In a runner shut off in an injection molding system including a pair of one-piece mold plates having mating surfaces, the mold plates being secured together to form a plurality of mold cavities joined in fluid communication by supply runners formed in one of the mating surfaces of one of the one-piece mold plates, the improvement comprising:
- a cylindrical bore formed in one of the mold plates such that it cuts through one of the supply runners and extends from the surface of the mold plate a predetermined depth less than the total thickness of the mold plate;
- and
- supply runner shut off means for selectively controlling the flow of a molding material to the mold cavities, the shut off means including an outer casing press-fit into the cylindrical bore and a core pin rotatably received in the casing and being movable to a plurality of rotated positions with respect to the casing.
In a runner shut off in an injection molding system including a pair of mold plates having mating surfaces, the mold plates being secured together to form a plurality of mold cavities joined in fluid communication by supply runners formed in one of the mating surfaces, the improvement comprising:
- a cylindrical bore formed in one of the mold plates such that it cuts through one of the supply runners;
- supply runner shut off means for selectively controlling the flow of a molding material to the mold cavities, the shut off means including:
- an outer casing press-fit into the cylindrical bore;
- a core pin rotatably received in the casing and being movable to a plurality of rotated positions with respect to the casing;
- and
- retainer means for selectively holding the core pin in one of a plurality of rotated positions with respect to the casing, the retainer means including a retainer body wherein registerable openings are formed in the core pin and the retainer body, and wherein a dowel pin is disposed in the openings to simultaneously engage and prevent rotation of the core pin with respect to the retainer body while the shut off means is being press-fit into the cylindrical bore, the dowel pin being subsequently disengaged from the core pin to allow rotation with respect to the retainer body and the casing.
Dependencies are inferred from the claim text.