Patent ID: 7775789
Filing Date: 2010-08-17
Classification: B29C

Abstract:
1. An injection mold shutoff assembly comprising: an exterior seat of the assembly sealable to a nozzle of an injection molding machine which is spaced from the assembly when in a nonengaged position; a first opening providing fluid communication from the exterior seat to a chamber, through an entry wall of the chamber, a first sealing surface of the entry wall surrounding the first opening; a movable body reciprocally movable within the chamber from a rear position proximate to the entry wall to a forward position remote from the entry wall, the movable body having a second sealing surface sealable with the first sealing surface when the movable body is in the rear position; an exit wall of the chamber including a second opening formed therein and being in fluid communication with at least one receiving unit; a stem of the nozzle inserted through the first opening at or after the time that the nozzle is sealed to the exterior seat of the assembly, a forward end of the stem contacting the movable body so the stem prevents movement to the rear position; at least one passage of the chamber extending from the entry wall to the exit wall and adapted to transport molten polymer from the first opening to the second opening when the movable body is in the forward position; and the movable body returning to the rear position when the stem is withdrawn from the first opening, whereby the second sealing surface seals with the first sealing surface, closing the first opening.