| 摘要 |
An apparatus for injection molding bent pipe made of plastic material which has a bend part (8) with an arcuate centerline and with uniform internal cross-section, and cylindrical connecting parts (9, 22) adjoining the bend part at one or both sides. The connecting parts (9, 22) have larger internal cross-section than the bend part (8). The apparatus includes an injection mold which can be divided along a plane containing an arcuate centerline of the bend part into at least two outer mold portions which form a mold cavity. The injection mold includes a bend core with a pivotal member (5) which is pivotable along the arcuate centerline of the bend part and a cylindrical core (13) which is displaceable axially along its centerline, for each connecting part (9, 22). The apparatus includes two bars (1, 2) which are spaced from each other in the plane containing the arcuate centerline and whose respective pivotal mounting points (3, 4) on the pivotal member (5) are guided in the bend part (8) on circular paths about an axis of curvature (K) and in the connecting part (9) adjoining same in parallel relationship therewith.
|
