Patent · US Expired

Apparatus for bending thin-walled pipes

US4543809A · kind A · utility

0Cited by

8References

7Claims

0Family size

Inventor

Thomas Lang · Schwäbisch Hall, DE

Key dates

Filing date	Jun 30, 1983
Grant date	Oct 1, 1985
Priority date	—
Expiry date	Jun 30, 2003

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB21D9/01
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

Thin walled pipes, as for example pressure gauge springs are bent by inserting a flexible mandrel in to the pipe and to forward the pipe simultaneously with the mandrel over a forming member until a sufficient length of the pipe is provided for the bending step. The mandrel is then forwarded relative to the pipe to project therefrom and both parts are bent around the forming member. Then, the mandrel is retracted and the pipe arc is separated.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.