Injection mold

An injection mold for molding an article having an undercut at at least one end portion thereof comprising stationary and movable mold halves which are adapted to be closed to form a cavity conforming to the shape of the article with the stationary mold half defining an outer surface of the article and the movable mold half defining an inner surface of the article, the movable mold half comprising a slide core which defines the inner surfaces of said one end portion and said undercut, a main body which defines the inner surface of the other portion of the article, and an ejector means which ejects the molded article in a predetermined ejecting direction, the slide core being slidable relative to the main body along an inclined surface which is formed on the main body at an angle to the ejecting direction so that when said ejector means operates to eject the molded article, the slide core is slid along the inclined surface to be moved both in a direction parallel to the ejecting direction and in a direction perpendicular to the ejecting direction thereby permitting the undercut of the molded article to clear the slide core, wherein the improvement comprises that said slide core is divided, at the portion defining the inner surfaces of the end portion and the undercut, into a plurality of core pieces in the direction perpendicular to both said ejecting direction and said direction in which the slide core is moved in perpendicular to the ejecting direction, and at least one of the core pieces is adapted to be slid along an inclined surface which is at an angle to the ejecting direction larger than the angle at which the inclined surface or surfaces of the other core piece or pieces are to the ejecting direction, the article is further provided with a projection from an inner surface of the end portion thereof which extends in a direction perpendicular to the ejecting direction, as defined by a recess means provided on at least one of said core pieces of said slide core, wherein said at least one of said core pieces provided with a recess means is adapted to be slid along an inclined surface which is at an angle to the ejecting direction larger than the angle at which the inclined surface or surfaces of the other core piece of pieces are to the ejecting direction.