Patent ID: 6192726
Filing Date: 2001-02-27
Classification: B21C

Abstract:
A pipe forming apparatus for forming spirally formed corrugated pipe, wherein the pipe moves in an axial direction and rotates while it is being formed, the pipe forming apparatus comprising:a forming head for receiving an uncorrugated strip of material and coiling the material into a spiral pipe, the forming head having an inner diameter, an entering end and an exit end; anda selectively operable corrugation module associated with the forming head, the corrugation module comprising:a first rotatable corrugation roller positioned outside of the spiral pipe and adjacent to the exit end of the forming head;a second rotatable corrugation roller positioned inside the spiral pipe and adjacent to the exit end of the forming head; anda force producing mechanism configured to move at least one of the first and second corrugation rollers between a non-corrugating position where the first and second corrugation rollers are maintained in a spaced apart relationship, and a corrugating position where the first and second rollers are maintained in an overlapping position, wherein spiral pipe emerging from the forming head is corrugated as it moves in the axial direction and rotates between the first and second corrugation rollers.