Claims
- 1. A tool system for producing an air-gap-insulated exhaust pipe with a branch by internal high-pressure forming a double tube including an inner tube nested inside of an outer tube, said tool system comprising:a first internal high-pressure shaping tool having a first engraving including a main receiving area for receiving said double tube and a branch extending radially from said main receiving area for supporting a portion of the double tube to be expanded into the branch under high-pressure forming; a second internal high-pressure shaping tool having a second engraving which is circumferentially larger than said first engraving.
- 2. A tool system according to claim 1, further comprising a first tool counterpunch movably disposed in said branch of said first engraving for supporting an end of the double tube to be expanded into the branch.
- 3. A tool system according to claim 2, wherein said first tool counterpunch defines a central recess.
Priority Claims (1)
Number |
Date |
Country |
Kind |
197 52 772 |
Nov 1997 |
DE |
|
Parent Case Info
This application is a division of application Ser. No. 09/201,134, filed Nov. 30, 1998.
US Referenced Citations (18)
Foreign Referenced Citations (12)
Number |
Date |
Country |
4103083 |
May 1992 |
DE |
4339290 |
May 1995 |
DE |
4428435 |
Feb 1996 |
DE |
19511514 |
Aug 1996 |
DE |
19518252 |
Nov 1996 |
DE |
19546509 |
Jun 1997 |
DE |
19713411 |
Oct 1998 |
DE |
0582985 |
Feb 1994 |
EP |
0627272 |
May 1994 |
EP |
0 623 739 |
Nov 1994 |
EP |
0 761 335 |
Mar 1997 |
EP |
9531635 |
Nov 1995 |
WO |
Non-Patent Literature Citations (4)
Entry |
Opposition in a proceeding with the German Patent Office re German Patent Application No. DE 197 52 772.8-13 (English translation). |
Response to Opposition to German Patent Document No. DE 197 52 772.8-13 (German language original with English translation). |
Opposition in a proceeding with the German Patent Office re German Patent Application No. DE 197 52 773.6-13 (German language original with English translation). |
Responce to Opposition to German Patent Document No. DE 197 52 773.6-13 (German language original with English translation). |