Patent ID: 8550807

Claim:
A mold for forming a continuously-extruded parison into a corrugated pipe, the mold comprising: a mold housing comprising first and second opposing mold halves configured to mate along an upper interface and a lower interface, the upper interface defining a plurality of bores; a mold cavity having a plurality of annular corrugations; and a plurality of punches, each punch being disposed in one of the bores defined by the upper interface of the opposing mold halves, and each punch being aligned with one of the annular corrugations of the mold cavity; wherein each punch is configured to form an aperture in a corrugation of a corrugated pipe in the mold; wherein the mold is configured to move along a mold track, and the plurality of punches are configured to move along an actuator track connected to the mold track; wherein the actuator track includes a disengaging portion and an engaging portion; wherein, when the plurality of punches move along the actuator track from the disengaging portion to the engaging portion, the engaging portion is configured to actuate the plurality of punches to form apertures in corrugations of the corrugated pipe.