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:
Apr. 28, 1992
Filed:
May. 23, 1991
Applicant:
Inventors:
Egon Olszewski, Paderborn-Elsen, DE;
Rainer Hansen, Paderborn-Elsen, DE;
Dieter Topker, Paderborn-Neuenbeken, DE;
Assignee:
Benteler Aktiengesellschaft, Paderborn, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21D / ;
U.S. Cl.
CPC ...
72 58 ; 72 62 ; 294211 ;
Abstract
A die (2) formed of two halves (4, 5) is placed in a container (7) filled with an incompressible liquid. The die halves have a plane of contact disposed in parallel relation with and spaced from the axis of a hollow member to be deformed within a die cavity formed by the die halves. Mandrils (15) are forced into sealing contact with the open ends of the hollow member by hydraulic cylinders. A high deformation pressure is supplied into the hollow member and the mandrils are secured in sealing contact with the hollow member against such pressure.