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:
Aug. 10, 1999
Filed:
Dec. 10, 1997
Alfred Nitsche, Berlin, DE;
BSH Bosch und Siemens Hausgeraete GmbH, Munich, DE;
Abstract
A laundry drum for a washing machine includes sheet-metal wall portions and outer portions outside the sheet-metal wall portions. The sheet-metal wall portions have holes formed therein for the passage of treatment media, such as water or air and regions surrounding the holes toward the outer portions. The regions surrounding the holes are elongated into a tuliplike or frustoconical shape and have flat-formed edges bordering the holes to assure that a burr at margins of the holes remains as harmless as possible for gentle handling of delicate laundry. A tool for producing the laundry drum has a needle for cutting the holes, a stiffening piece for bracing the sheet-metal wall portion from below, and a female stamping die guiding the needle and having an offset end surface with a diameter less than the outer diameter of the surrounding regions of the sheet-metal wall portion.