The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 09, 1996
Filed:
Aug. 19, 1994
Walter Wetzels, Aachen, DE;
Rainer Hergemoeller, Aachen, DE;
Schumag AG, Aachen, DE;
Abstract
A tubular blank formed by casting or extrusion or the like and having a relatively thick wall is prepared for a following drawing operation, such as a tandem or cascade drawing, by widening one end of the tubular blank with a shackled mandrel. Then the widened or distended section is stretched by a cooperative, external stretching action between the shackled mandrel and a draw plate to form a stretched section. Then, the stretched section is passed through a draw plate that may be the same or a different draw plate than the first mentioned draw plate, and then drawing over the shackled mandrel to provide the required reduced wall thickness for the following tandem drawing.