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:
Feb. 03, 2004
Filed:
Aug. 05, 2002
Peter Kettner, Denklingen, DE;
Andreas Dietrich, Fuchstal, DE;
Hubert Nägele, Fuchstal, DE;
Manfred Hirschvogel, Fuchstal, DE;
Hirschvogel Umformtechnik GmbH, Denklingen, DE;
Abstract
The invention relates to a method for extracting a die ( ) from a hollow object ( ) having several grooves ( ) arranged opposite one another on the surface of the inner sheath whereby the longitudinal axes thereof extend crosswise relative to the corresponding longitudinal central planes (i.e. cross-grooves), whereby said die ( ) is part of a tool ( ) having a matrix ( ) for forming the hollow object ( ) and several other die segments ( ) arranged opposite one another relative to the central axis ( ) thereof. Each of said die segments has an outer ridge ( ); in order to form the hollow object, said die segments ( ) are expanded into a working position, whereby the ridges ( ) are fitted into corresponding grooves ( ), and extracted after the hollow object ( ) has been formed. In order to facilitate extraction, all die segments ( ) are extracted by contraction movements ( ) perpendicular to the central axis ( ) and a relative axial movement ( ) between the die segments ( ).