Textiles: fluid treating apparatus – Machines – Tumbling
Patent
1997-12-10
1999-08-10
Coe, Philip R.
Textiles: fluid treating apparatus
Machines
Tumbling
D06F 3704
Patent
active
059341106
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.
REFERENCES:
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patent: 4202187 (1980-05-01), Hukuzawa et al.
patent: 4771615 (1988-09-01), Fukuzawa et al.
patent: 4888965 (1989-12-01), Fanson et al.
patent: 4920661 (1990-05-01), Fukuzawa et al.
patent: 5463821 (1995-11-01), Gauer
BSH Bosch und Siemens Haus-geraete GmbH
Coe Philip R.
Greenberg Laurence A.
Lerner Herbert L.
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