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:
Jan. 21, 1997
Filed:
Aug. 02, 1994
Thomas W Scherf, Vandergrift, PA (US);
Aluminum Company of America, Pittsburgh, PA (US);
Abstract
Apparatus for calibrating a nonsymmetrical hollow article includes a plurality of internal die elements which are inserted into the hollow article and are expanded by a tapered plunger so as to outwardly reform the hollow article into the desired size and shape. An external die restrains the outer surface of the portion of the hollow article during reforming. The apparatus is also usable on hollow articles which do not have a linear longitudinal axis. The surface to surface engagement between internal die members creates an interface which is preferably generally aligned with straight portions of the inner surface of the hollow article except for internal corners of the article. Corresponding methods are disclosed.