Patent Number: 6,309,588

Title: Process and apparatus for bending thin-wall plastic tubing

Abstract: Process and apparatus for bending thin-wall thermoplastic tubing utilizing pressure inside the tube portion being bent to thereby maintain the shape of the tube during bending, and applying heat only in the zone of the tube that is stretched by pulling it axially during continuous incremental bending around a rotatable bend die to thereby maintain the original cross-sectional shape of the tubing. The tube inside radius surface is continuously supported during application of bending-induced tensile stress by causing the tube to track or wrap partially around a rotatable bend die in a generally linear (minimum slip) tracking mode.

Inventors: Powell; Patrick (Lapeer, MI), Manning; Russell (Pontiac, MI)

Assignee: Dana Corporation

International Classification: B29C 53/84 (20060101); B29C 53/00 (20060101); B29C 53/08 (20060101); B21D 009/00 (); B21D 037/16 (); B29C 053/08 (); B29C 053/84 ()

Expiration Date: 10/30/2018