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US 4,481,803 AGranted
Method for eliminating distortion at the end of a tube bend
AssigneeTeledyne Industries, Inc.
InventorJohn J. Dieser
Life of this patent
Estimating the term…
Abstract
A tube is bent a desired angle by locating it over a mandrel, clamping the tube between a clamp die and bend die, rotating the clamp and bend dies through the desired angle, where extraction of the mandrel from the tube is initiated before rotation of the dies is completed.
Claims6
A method for bending a tube at a desired angle, comprising the steps of:
- locating the tube over a mandrel;
- clamping said tube between a clamp die and a bend die;
- rotating said clamp and bend dies through said desired angle to form a bend in the tube;
- and
- extracting said mandrel from said tube bend, wherein said extracting step is initiated before said die rotation is completed and continues during a remaining portion of said die rotation which completes bending of the tube.
2 more elements
Dependencies are inferred from the claim text.