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:
Mar. 10, 1981
Filed:
Jun. 04, 1979
Harry P Proctor, Minneapolis, MN (US);
National Can Corporation, Chicago, IL (US);
Abstract
An ironing die for use with a punch to reduce the wall thickness of the sidewall of the metal cup includes a body which has a circular opening therein extending from the leading surface to a trailing surface that are parallel to each other and the opening has a land spaced from both surfaces which defines a minimum diameter for the opening. The opening also has a cylindrical portion between the land and the trailing surface which has a diameter slightly larger than the minimum diameter to guide the cup after the free edge moves past the land. The opening is also flared outwardly between the land and the leading surface to produce an entry portion which guides the cup to a centered position with respect to the ironing land. In one embodiment, the wall which defines the opening also has a cut out portion between the land and the cylindrical portion.